Testing rendering to quad

2024-08-27 13:47:43 -07:00
70 changed files with 469 additions and 833 deletions
@@ -7,5 +7,3 @@ for next branch cut* header.
 appropriate header in [RELEASE_NOTES.md](./RELEASE_NOTES.md).

 ## Release notes for next branch cut
-
- Add a `name` API to Filament objects for debugging handle use-after-free assertions
@@ -1308,12 +1308,7 @@ Description
      declare a variable called `eyeDirection` you can access it in the fragment shader using
      `variable_eyeDirection`. In the vertex shader, the interpolant name is simply a member of
      the `MaterialVertexInputs` structure (`material.eyeDirection` in your example). Each
-      interpolant is of type `float4` (`vec4`) in the shaders. By default the precision of the
-      interpolant is `highp` in *both* the vertex and fragment shaders.
-      An alternate syntax can be used to specify both the name and precision of the interpolant.
-      In this case the specified precision is used as-is in both fragment and vertex stages, in
-      particular if `default` is specified the default precision is used is the fragment shader
-      (`mediump`) and in the vertex shader (`highp`).
+      interpolant is of type `float4` (`vec4`) in the shaders.

 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ JSON
 material {
@@ -1325,11 +1320,7 @@ material {
        }
    ],
    variables : [
-         eyeDirection,
-         {
-            name : eyeColor,
-            precision : medium
-         }
+         eyeDirection
    ],
    vertexDomain : device,
    depthWrite : false,
@@ -61,7 +61,6 @@ set(SRCS
        src/Engine.cpp
        src/Exposure.cpp
        src/Fence.cpp
-        src/FilamentBuilder.cpp
        src/FrameInfo.cpp
        src/FrameSkipper.cpp
        src/Froxelizer.cpp
@@ -1058,7 +1058,7 @@ struct RasterState {
            bool inverseFrontFaces                      : 1;        // 31

            //! padding, must be 0
-            uint8_t padding                             : 1;        // 32
+            bool depthClamp                             : 1;        // 32
        };
        uint32_t u = 0;
    };
@@ -162,10 +162,6 @@ DECL_DRIVER_API_0(finish)
 // reset state tracking, if the driver does any state tracking (e.g. GL)
 DECL_DRIVER_API_0(resetState)

-DECL_DRIVER_API_N(setDebugTag,
-        backend::HandleBase::HandleId, handleId,
-        utils::CString, tag)
-
 /*
 * Creating driver objects
 * -----------------------
@@ -309,6 +305,7 @@ DECL_DRIVER_API_SYNCHRONOUS_0(bool, isParallelShaderCompileSupported)
 DECL_DRIVER_API_SYNCHRONOUS_0(bool, isDepthStencilResolveSupported)
 DECL_DRIVER_API_SYNCHRONOUS_N(bool, isDepthStencilBlitSupported, backend::TextureFormat, format)
 DECL_DRIVER_API_SYNCHRONOUS_0(bool, isProtectedTexturesSupported)
+DECL_DRIVER_API_SYNCHRONOUS_0(bool, isDepthClampSupported)
 DECL_DRIVER_API_SYNCHRONOUS_0(uint8_t, getMaxDrawBuffers)
 DECL_DRIVER_API_SYNCHRONOUS_0(size_t, getMaxUniformBufferSize)
 DECL_DRIVER_API_SYNCHRONOUS_0(math::float2, getClipSpaceParams)
@@ -20,12 +20,11 @@
 #include <backend/Handle.h>

 #include <utils/Allocator.h>
-#include <utils/CString.h>
 #include <utils/Log.h>
-#include <utils/Panic.h>
 #include <utils/compiler.h>
 #include <utils/debug.h>
 #include <utils/ostream.h>
+#include <utils/Panic.h>

 #include <tsl/robin_map.h>

@@ -174,10 +173,8 @@ public:
                uint8_t const age = (tag & HANDLE_AGE_MASK) >> HANDLE_AGE_SHIFT;
                auto const pNode = static_cast<typename Allocator::Node*>(p);
                uint8_t const expectedAge = pNode[-1].age;
-                // getHandleTag() is only called if the check fails.
-                FILAMENT_CHECK_POSTCONDITION(expectedAge == age)
-                        << "use-after-free of Handle with id=" << handle.getId()
-                        << ", tag=" << getHandleTag(handle.getId()).c_str_safe();
+                FILAMENT_CHECK_POSTCONDITION(expectedAge == age) <<
+                        "use-after-free of Handle with id=" << handle.getId();
            }
        }

@@ -204,34 +201,6 @@ public:
        return handle_cast<Dp>(const_cast<Handle<B>&>(handle));
    }

-    void associateTagToHandle(HandleBase::HandleId id, utils::CString&& tag) noexcept {
-        // TODO: for now, only pool handles check for use-after-free, so we only keep tags for
-        // those
-        if (isPoolHandle(id)) {
-            // Truncate the tag's age to N bits.
-            constexpr uint8_t N = 2; // support a history of 4 tags
-            constexpr uint8_t mask = (1 << N) - 1;
-
-            uint8_t const age = (id & HANDLE_AGE_MASK) >> HANDLE_AGE_SHIFT;
-            uint8_t const newAge = age & mask;
-            uint32_t const key = (id & ~HANDLE_AGE_MASK) | (newAge << HANDLE_AGE_SHIFT);
-
-            // This line is the costly part. In the future, we could potentially use a custom
-            // allocator.
-            mDebugTags[key] = std::move(tag);
-        }
-    }
-
-    utils::CString getHandleTag(HandleBase::HandleId id) const noexcept {
-        if (!isPoolHandle(id)) {
-            return "(no tag)";
-        }
-        if (auto pos = mDebugTags.find(id); pos != mDebugTags.end()) {
-            return pos->second;
-        }
-        return "(no tag)";
-    }
-
 private:

    template<typename D>
@@ -394,7 +363,6 @@ private:
    // Below is only used when running out of space in the HandleArena
    mutable utils::Mutex mLock;
    tsl::robin_map<HandleBase::HandleId, void*> mOverflowMap;
-    tsl::robin_map<HandleBase::HandleId, utils::CString> mDebugTags;
    HandleBase::HandleId mId = 0;
    bool mUseAfterFreeCheckDisabled = false;
 };
@@ -80,9 +80,6 @@ HandleAllocator<P0, P1, P2>::HandleAllocator(const char* name, size_t size,
        bool disableUseAfterFreeCheck) noexcept
    : mHandleArena(name, size, disableUseAfterFreeCheck),
      mUseAfterFreeCheckDisabled(disableUseAfterFreeCheck) {
-    // Reserve initial space for debug tags. This prevents excessive calls to malloc when the first
-    // few tags are set.
-    mDebugTags.reserve(512);
 }

 template <size_t P0, size_t P1, size_t P2>
@@ -112,6 +112,7 @@ struct MetalContext {
    std::array<BufferState, MAX_SSBO_COUNT> ssboState;
    CullModeStateTracker cullModeState;
    WindingStateTracker windingState;
+    DepthClampStateTracker depthClampState;
    Handle<HwRenderPrimitive> currentRenderPrimitive;

    // State caches.
@@ -834,6 +834,10 @@ bool MetalDriver::isProtectedTexturesSupported() {
    return false;
 }

+bool MetalDriver::isDepthClampSupported() {
+    return true;
+}
+
 bool MetalDriver::isWorkaroundNeeded(Workaround workaround) {
    switch (workaround) {
        case Workaround::SPLIT_EASU:
@@ -1751,6 +1755,13 @@ void MetalDriver::bindPipeline(PipelineState const& ps) {
        [mContext->currentRenderPassEncoder setFrontFacingWinding:winding];
    }

+    // depth clip mode
+    MTLDepthClipMode depthClipMode = rs.depthClamp ? MTLDepthClipModeClamp : MTLDepthClipModeClip;
+    mContext->depthClampState.updateState(depthClipMode);
+    if (mContext->depthClampState.stateChanged()) {
+        [mContext->currentRenderPassEncoder setDepthClipMode:depthClipMode];
+    }
+
    // Set the depth-stencil state, if a state change is needed.
    DepthStencilState depthState;
    if (depthAttachment) {
@@ -2061,10 +2072,6 @@ void MetalDriver::enumerateBoundBuffers(BufferObjectBinding bindingType,
 void MetalDriver::resetState(int) {
 }

-void MetalDriver::setDebugTag(HandleBase::HandleId handleId, utils::CString tag) {
-    mHandleAllocator.associateTagToHandle(handleId, std::move(tag));
-}
-
 void MetalDriver::runAtNextTick(const std::function<void()>& fn) noexcept {
    std::lock_guard<std::mutex> const lock(mTickOpsLock);
    mTickOps.push_back(fn);
@@ -382,6 +382,7 @@ using SamplerStateCache = StateCache<SamplerState, id<MTLSamplerState>, SamplerS

 using CullModeStateTracker = StateTracker<MTLCullMode>;
 using WindingStateTracker = StateTracker<MTLWinding>;
+using DepthClampStateTracker = StateTracker<MTLDepthClipMode>;

 // Argument encoder

@@ -202,6 +202,10 @@ bool NoopDriver::isProtectedTexturesSupported() {
    return true;
 }

+bool NoopDriver::isDepthClampSupported() {
+    return false;
+}
+
 bool NoopDriver::isWorkaroundNeeded(Workaround) {
    return false;
 }
@@ -388,7 +392,4 @@ void NoopDriver::endTimerQuery(Handle<HwTimerQuery> tqh) {
 void NoopDriver::resetState(int) {
 }

-void NoopDriver::setDebugTag(HandleBase::HandleId handleId, utils::CString tag) {
-}
-
 } // namespace filament
@@ -676,6 +676,7 @@ void OpenGLContext::initExtensionsGLES(Extensions* ext, GLint major, GLint minor
 #ifndef __EMSCRIPTEN__
    ext->EXT_debug_marker = exts.has("GL_EXT_debug_marker"sv);
 #endif
+    ext->EXT_depth_clamp = exts.has("GL_EXT_depth_clamp"sv);
    ext->EXT_discard_framebuffer = exts.has("GL_EXT_discard_framebuffer"sv);
 #ifndef __EMSCRIPTEN__
    ext->EXT_disjoint_timer_query = exts.has("GL_EXT_disjoint_timer_query"sv);
@@ -746,6 +747,7 @@ void OpenGLContext::initExtensionsGL(Extensions* ext, GLint major, GLint minor)
    ext->EXT_color_buffer_half_float = true;  // Assumes core profile.
    ext->EXT_clip_cull_distance = true;
    ext->EXT_debug_marker = exts.has("GL_EXT_debug_marker"sv);
+    ext->EXT_depth_clamp = true;
    ext->EXT_discard_framebuffer = false;
    ext->EXT_disjoint_timer_query = true;
    ext->EXT_multisampled_render_to_texture = false;
@@ -1044,11 +1046,6 @@ void OpenGLContext::resetState() noexcept {
    );
    glDepthMask(state.raster.depthMask);
    glDepthFunc(state.raster.depthFunc);
-
-    utils::slog.e << "stencil front=" << 
-        state.stencil.front.func.func << " "  <<
-        state.stencil.front.func.ref << " "  <<
-        state.stencil.front.func.mask << " " << utils::io::endl;
    
    // state.stencil
    glStencilFuncSeparate(
@@ -220,8 +220,9 @@ public:
        bool EXT_color_buffer_float;
        bool EXT_color_buffer_half_float;
        bool EXT_debug_marker;
-        bool EXT_disjoint_timer_query;
+        bool EXT_depth_clamp;
        bool EXT_discard_framebuffer;
+        bool EXT_disjoint_timer_query;
        bool EXT_multisampled_render_to_texture2;
        bool EXT_multisampled_render_to_texture;
        bool EXT_protected_textures;
@@ -239,10 +240,10 @@ public:
        bool KHR_parallel_shader_compile;
        bool KHR_texture_compression_astc_hdr;
        bool KHR_texture_compression_astc_ldr;
-        bool OES_depth_texture;
-        bool OES_depth24;
-        bool OES_packed_depth_stencil;
        bool OES_EGL_image_external_essl3;
+        bool OES_depth24;
+        bool OES_depth_texture;
+        bool OES_packed_depth_stencil;
        bool OES_rgb8_rgba8;
        bool OES_standard_derivatives;
        bool OES_texture_npot;
@@ -627,6 +628,7 @@ constexpr size_t OpenGLContext::getIndexForCap(GLenum cap) noexcept { //NOLINT
 #ifdef BACKEND_OPENGL_VERSION_GL
        case GL_PROGRAM_POINT_SIZE:             index = 10; break;
 #endif
+        case GL_DEPTH_CLAMP:                    index = 11; break;
        default: break;
    }
    assert_invariant(index < state.enables.caps.size());
@@ -451,6 +451,14 @@ void OpenGLDriver::setRasterState(RasterState rs) noexcept {
    } else {
        gl.disable(GL_SAMPLE_ALPHA_TO_COVERAGE);
    }
+
+    if (gl.ext.EXT_depth_clamp) {
+        if (rs.depthClamp) {
+            gl.enable(GL_DEPTH_CLAMP);
+        } else {
+            gl.disable(GL_DEPTH_CLAMP);
+        }
+    }
 }

 void OpenGLDriver::setStencilState(StencilState ss) noexcept {
@@ -460,20 +468,20 @@ void OpenGLDriver::setStencilState(StencilState ss) noexcept {

    // stencil test / operation
    // GL_STENCIL_TEST must be enabled if we're testing OR writing to the stencil buffer.
-    // if (UTILS_LIKELY(
-    //         ss.front.stencilFunc == StencilState::StencilFunction::A &&
-    //         ss.back.stencilFunc == StencilState::StencilFunction::A &&
-    //         ss.front.stencilOpDepthFail == StencilOperation::KEEP &&
-    //         ss.back.stencilOpDepthFail == StencilOperation::KEEP &&
-    //         ss.front.stencilOpStencilFail == StencilOperation::KEEP &&
-    //         ss.back.stencilOpStencilFail == StencilOperation::KEEP &&
-    //         ss.front.stencilOpDepthStencilPass == StencilOperation::KEEP &&
-    //         ss.back.stencilOpDepthStencilPass == StencilOperation::KEEP) && false) {
-    //     // that's equivalent to having the stencil test disabled
-    //     gl.disable(GL_STENCIL_TEST);
-    // } else {
+    if (UTILS_LIKELY(
+            ss.front.stencilFunc == StencilState::StencilFunction::A &&
+            ss.back.stencilFunc == StencilState::StencilFunction::A &&
+            ss.front.stencilOpDepthFail == StencilOperation::KEEP &&
+            ss.back.stencilOpDepthFail == StencilOperation::KEEP &&
+            ss.front.stencilOpStencilFail == StencilOperation::KEEP &&
+            ss.back.stencilOpStencilFail == StencilOperation::KEEP &&
+            ss.front.stencilOpDepthStencilPass == StencilOperation::KEEP &&
+            ss.back.stencilOpDepthStencilPass == StencilOperation::KEEP)) {
+        // that's equivalent to having the stencil test disabled
+        gl.disable(GL_STENCIL_TEST);
+    } else {
        gl.enable(GL_STENCIL_TEST);
-//    }
+    }

    // glStencilFuncSeparate() also sets the reference value, which may be used depending
    // on the stencilOp, so we always need to call glStencilFuncSeparate().
@@ -481,9 +489,9 @@ void OpenGLDriver::setStencilState(StencilState ss) noexcept {
            getStencilFunc(ss.front.stencilFunc), ss.front.ref, ss.front.readMask,
            getStencilFunc(ss.back.stencilFunc), ss.back.ref, ss.back.readMask);

-//    if (UTILS_LIKELY(!ss.stencilWrite)) {
-//        gl.stencilMaskSeparate(0x00, 0x00);
-//    } else {
+    if (UTILS_LIKELY(!ss.stencilWrite)) {
+        gl.stencilMaskSeparate(0x00, 0x00);
+    } else {
        // Stencil ops are only relevant when stencil write is enabled
        gl.stencilOpSeparate(
                getStencilOp(ss.front.stencilOpStencilFail),
@@ -493,7 +501,7 @@ void OpenGLDriver::setStencilState(StencilState ss) noexcept {
                getStencilOp(ss.back.stencilOpDepthFail),
                getStencilOp(ss.back.stencilOpDepthStencilPass));
        gl.stencilMaskSeparate(ss.front.writeMask, ss.back.writeMask);
-//    }
+    }
 }

 // ------------------------------------------------------------------------------------------------
@@ -2119,6 +2127,10 @@ bool OpenGLDriver::isProtectedTexturesSupported() {
    return getContext().ext.EXT_protected_textures;
 }

+bool OpenGLDriver::isDepthClampSupported() {
+    return getContext().ext.EXT_depth_clamp;
+}
+
 bool OpenGLDriver::isWorkaroundNeeded(Workaround workaround) {
    switch (workaround) {
        case Workaround::SPLIT_EASU:
@@ -2210,10 +2222,6 @@ void OpenGLDriver::makeCurrent(Handle<HwSwapChain> schDraw, Handle<HwSwapChain>
 // Updating driver objects
 // ------------------------------------------------------------------------------------------------

-void OpenGLDriver::setDebugTag(HandleBase::HandleId handleId, utils::CString tag) {
-    mHandleAllocator.associateTagToHandle(handleId, std::move(tag));
-}
-
 void OpenGLDriver::setVertexBufferObject(Handle<HwVertexBuffer> vbh,
        uint32_t index, Handle<HwBufferObject> boh) {
   DEBUG_MARKER()
@@ -201,6 +201,12 @@ using namespace glext;
 #   define GL_CLIP_DISTANCE1                        0x3001
 #endif

+#if defined(GL_EXT_depth_clamp)
+#   define GL_DEPTH_CLAMP                           GL_DEPTH_CLAMP_EXT
+#else
+#   define GL_DEPTH_CLAMP                           0x864F
+#endif
+
 #if defined(GL_KHR_debug)
 #   define GL_DEBUG_OUTPUT                          GL_DEBUG_OUTPUT_KHR
 #   define GL_DEBUG_OUTPUT_SYNCHRONOUS              GL_DEBUG_OUTPUT_SYNCHRONOUS_KHR
@@ -125,6 +125,10 @@ public:
        return mPhysicalDeviceFeatures.imageCubeArray == VK_TRUE;
    }

+    inline bool isDepthClampSupported() const noexcept {
+        return mPhysicalDeviceFeatures.depthClamp == VK_TRUE;
+    }
+
    inline bool isDebugMarkersSupported() const noexcept {
        return mDebugMarkersSupported;
    }
@@ -944,6 +944,10 @@ bool VulkanDriver::isProtectedTexturesSupported() {
    return false;
 }

+bool VulkanDriver::isDepthClampSupported() {
+    return mContext.isDepthClampSupported();
+}
+
 bool VulkanDriver::isWorkaroundNeeded(Workaround workaround) {
    switch (workaround) {
        case Workaround::SPLIT_EASU: {
@@ -1816,6 +1820,8 @@ void VulkanDriver::bindPipeline(PipelineState const& pipelineState) {
        .dstAlphaBlendFactor = getBlendFactor(rasterState.blendFunctionDstAlpha),
        .colorWriteMask = (VkColorComponentFlags) (rasterState.colorWrite ? 0xf : 0x0),
        .rasterizationSamples = rt->getSamples(),
+        .depthClamp = rasterState.depthClamp,
+        .reserved = 0,
        .colorTargetCount = rt->getColorTargetCount(mCurrentRenderPass),
        .colorBlendOp = rasterState.blendEquationRGB,
        .alphaBlendOp =  rasterState.blendEquationAlpha,
@@ -2032,10 +2038,6 @@ void VulkanDriver::debugCommandBegin(CommandStream* cmds, bool synchronous, cons
 void VulkanDriver::resetState(int) {
 }

-void VulkanDriver::setDebugTag(HandleBase::HandleId handleId, utils::CString tag) {
-    mResourceAllocator.associateHandle(handleId, std::move(tag));
-}
-
 // explicit instantiation of the Dispatcher
 template class ConcreteDispatcher<VulkanDriver>;

@@ -184,6 +184,7 @@ VulkanPipelineCache::PipelineCacheEntry* VulkanPipelineCache::createPipeline() n
    vkRaster.polygonMode = VK_POLYGON_MODE_FILL;
    vkRaster.cullMode = raster.cullMode;
    vkRaster.frontFace = raster.frontFace;
+    vkRaster.depthClampEnable = raster.depthClamp;
    vkRaster.depthBiasEnable = raster.depthBiasEnable;
    vkRaster.depthBiasConstantFactor = raster.depthBiasConstantFactor;
    vkRaster.depthBiasClamp = 0.0f;
@@ -90,7 +90,9 @@ public:
        VkBlendFactor         srcAlphaBlendFactor : 5;
        VkBlendFactor         dstAlphaBlendFactor : 5;
        VkColorComponentFlags colorWriteMask : 4;
-        uint8_t               rasterizationSamples;    // offset = 4 bytes
+        uint8_t               rasterizationSamples : 4;// offset = 4 bytes
+        uint8_t               depthClamp : 1;
+        uint8_t               reserved : 3;
        uint8_t               colorTargetCount;        // offset = 5 bytes
        BlendEquation         colorBlendOp : 4;        // offset = 6 bytes
        BlendEquation         alphaBlendOp : 4;
@@ -105,10 +105,6 @@ public:
        mHandleAllocatorImpl.deallocate(handle, obj);
    }

-    inline void associateHandle(HandleBase::HandleId id, utils::CString&& tag) noexcept {
-        mHandleAllocatorImpl.associateTagToHandle(id, std::move(tag));
-    }
-
 private:
    AllocatorImpl mHandleAllocatorImpl;

@@ -325,6 +325,7 @@ VkDevice createLogicalDevice(VkPhysicalDevice physicalDevice,
    // We could simply enable all supported features, but since that may have performance
    // consequences let's just enable the features we need.
    VkPhysicalDeviceFeatures enabledFeatures{
+            .depthClamp = features.depthClamp,
            .samplerAnisotropy = features.samplerAnisotropy,
            .textureCompressionETC2 = features.textureCompressionETC2,
            .textureCompressionBC = features.textureCompressionBC,
@@ -54,7 +54,7 @@ public:
    using BufferDescriptor = backend::BufferDescriptor;
    using BindingType = backend::BufferObjectBinding;

-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -78,21 +78,6 @@ public:
         */
        Builder& bindingType(BindingType bindingType) noexcept;

-        /**
-         * Associate an optional name with this BufferObject for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this BufferObject
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the BufferObject and returns a pointer to it. After creation, the buffer
         * object is uninitialized. Use BufferObject::setBuffer() to initialize it.
@@ -19,7 +19,6 @@

 #include <utils/compiler.h>
 #include <utils/PrivateImplementation.h>
-#include <utils/CString.h>

 #include <stddef.h>

@@ -55,22 +54,6 @@ public:
 template<typename T>
 using BuilderBase = utils::PrivateImplementation<T>;

-void builderMakeName(utils::CString& outName, const char* name, size_t len) noexcept;
-
-template <typename Builder>
-class UTILS_PUBLIC BuilderNameMixin {
-public:
-    Builder& name(const char* name, size_t len) noexcept {
-        builderMakeName(mName, name, len);
-        return static_cast<Builder&>(*this);
-    }
-
-    utils::CString const& getName() const noexcept { return mName; }
-
-private:
-    utils::CString mName;
-};
-
 } // namespace filament

 #endif // TNT_FILAMENT_FILAMENTAPI_H
@@ -59,7 +59,7 @@ public:
        UINT = uint8_t(backend::ElementType::UINT),      //!< 32-bit indices
    };

-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -83,21 +83,6 @@ public:
         */
        Builder& bufferType(IndexType indexType) noexcept;

-        /**
-         * Associate an optional name with this IndexBuffer for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this IndexBuffer
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the IndexBuffer object and returns a pointer to it. After creation, the index
         * buffer is uninitialized. Use IndexBuffer::setBuffer() to initialize the IndexBuffer.
@@ -38,7 +38,7 @@ class UTILS_PUBLIC InstanceBuffer : public FilamentAPI {
    struct BuilderDetails;

 public:
-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;

    public:
@@ -70,21 +70,6 @@ public:
         */
        Builder& localTransforms(math::mat4f const* UTILS_NULLABLE localTransforms) noexcept;

-        /**
-         * Associate an optional name with this InstanceBuffer for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this InstanceBuffer
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the InstanceBuffer object and returns a pointer to it.
         */
@@ -39,7 +39,7 @@ class UTILS_PUBLIC MorphTargetBuffer : public FilamentAPI {
    struct BuilderDetails;

 public:
-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -63,21 +63,6 @@ public:
         */
        Builder& count(size_t count) noexcept;

-        /**
-         * Associate an optional name with this MorphTargetBuffer for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this MorphTargetBuffer
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the MorphTargetBuffer object and returns a pointer to it.
         *
@@ -39,7 +39,7 @@ class UTILS_PUBLIC SkinningBuffer : public FilamentAPI {
    struct BuilderDetails;

 public:
-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -69,21 +69,6 @@ public:
         */
        Builder& initialize(bool initialize = true) noexcept;

-        /**
-         * Associate an optional name with this SkinningBuffer for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this SkinningBuffer
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the SkinningBuffer object and returns a pointer to it.
         *
@@ -94,7 +94,7 @@ public:
     *
     * To create a NATIVE stream, call the <pre>stream</pre> method on the builder.
     */
-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -136,21 +136,6 @@ public:
         */
        Builder& height(uint32_t height) noexcept;

-        /**
-         * Associate an optional name with this Stream for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this Stream
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the Stream object and returns a pointer to it.
         *
@@ -112,7 +112,7 @@ public:


    //! Use Builder to construct a Texture object instance
-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -202,21 +202,6 @@ public:
         */
        Builder& swizzle(Swizzle r, Swizzle g, Swizzle b, Swizzle a) noexcept;

-        /**
-         * Associate an optional name with this Texture for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this Texture
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-         // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the Texture object and returns a pointer to it.
         *
@@ -61,7 +61,7 @@ public:
    using AttributeType = backend::ElementType;
    using BufferDescriptor = backend::BufferDescriptor;

-    class Builder : public BuilderBase<BuilderDetails>, public BuilderNameMixin<Builder> {
+    class Builder : public BuilderBase<BuilderDetails> {
        friend struct BuilderDetails;
    public:
        Builder() noexcept;
@@ -158,21 +158,6 @@ public:
         */
        Builder& advancedSkinning(bool enabled) noexcept;

-        /**
-         * Associate an optional name with this VertexBuffer for debugging purposes.
-         *
-         * name will show in error messages and should be kept as short as possible. The name is
-         * truncated to a maximum of 128 characters.
-         *
-         * The name string is copied during this method so clients may free its memory after
-         * the function returns.
-         *
-         * @param name A string to identify this VertexBuffer
-         * @param len Length of name, should be less than or equal to 128
-         * @return This Builder, for chaining calls.
-         */
-        // Builder& name(const char* UTILS_NONNULL name, size_t len) noexcept; // inherited
-
        /**
         * Creates the VertexBuffer object and returns a pointer to it.
         *
@@ -1,31 +0,0 @@
-/*
- * Copyright (C) 2024 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <filament/FilamentAPI.h>
-
-#include <algorithm>
-
-namespace filament {
-
-void builderMakeName(utils::CString& outName, const char* name, size_t len) noexcept {
-    if (!name) {
-        return;
-    }
-    size_t const length = std::min(len, size_t { 128u });
-    outName = utils::CString(name, length);
-}
-
-} // namespace filament
@@ -34,6 +34,8 @@

 #include <math/mat4.h>

+#include <utils/Log.h>
+
 namespace filament {

 using namespace backend;
@@ -120,6 +122,8 @@ void PerViewUniforms::prepareViewport(
    s.resolution = { physical.zw, 1.0f / physical.zw };
    s.logicalViewportScale = physical.zw / logical.zw;
    s.logicalViewportOffset = -logical.xy / logical.zw;
+    utils::slog.e << "resolution=" << s.resolution << " logical=" <<
+            s.logicalViewportScale << " " << s.logicalViewportOffset << utils::io::endl;
 }

 void PerViewUniforms::prepareTime(FEngine& engine, math::float4 const& userTime) noexcept {
@@ -2455,18 +2455,24 @@ FrameGraphId<FrameGraphTexture> PostProcessManager::colorGrading(FrameGraph& fg,

                const float temporalNoise = mUniformDistribution(mEngine.getRandomEngine());

+                auto yy = float4{
+                        (float)vp.left   / input.width,
+                        (float)vp.bottom / input.height,
+                        (float)vp.width  / input.width,
+                        (float)vp.height / input.height
+                };
+                
                mi->setParameter("dithering", colorGradingConfig.dithering);
                mi->setParameter("bloom", bloomParameters);
                mi->setParameter("vignette", vignetteParameters);
                mi->setParameter("vignetteColor", vignetteOptions.color);
                mi->setParameter("fxaa", colorGradingConfig.fxaa);
                mi->setParameter("temporalNoise", temporalNoise);
-                mi->setParameter("viewport", float4{
-                        (float)vp.left   / input.width,
-                        (float)vp.bottom / input.height,
-                        (float)vp.width  / input.width,
-                        (float)vp.height / input.height
-                });
+                mi->setParameter("viewport", yy);
+
+                utils::slog.e <<"yy------------yy in=" <<
+                        input.width << "x" << input.height << " viewport=" << yy << utils::io::endl;
+                        

                const uint8_t variant = uint8_t(colorGradingConfig.translucent ?
                            PostProcessVariant::TRANSLUCENT : PostProcessVariant::OPAQUE);
@@ -2508,6 +2514,17 @@ FrameGraphId<FrameGraphTexture> PostProcessManager::fxaa(FrameGraph& fg,
                        .filterMag = SamplerMagFilter::LINEAR,
                        .filterMin = SamplerMinFilter::LINEAR
                });
+
+                auto xx = float4{
+                        (float)vp.left   / inDesc.width,
+                        (float)vp.bottom / inDesc.height,
+                        (float)vp.width  / inDesc.width,
+                        (float)vp.height / inDesc.height
+                };
+
+                utils::slog.e <<"xx-----------xx" <<
+                        "in=" << inDesc.width <<"x" << inDesc.height  << " vp=" << vp << " viewport=" << xx << utils::io::endl;
+                
                mi->setParameter("viewport", float4{
                        (float)vp.left   / inDesc.width,
                        (float)vp.bottom / inDesc.height,
@@ -2945,10 +2962,6 @@ FrameGraphId<FrameGraphTexture> PostProcessManager::upscale(FrameGraph& fg, bool
                                    1.0f / outputDesc.height});
                    }

-                    if (blitterNames[index] == "blitLow") {
-                        mi->setParameter("levelOfDetail", 0.0f);
-                    }
-
                    mi->setParameter("viewport", float4{
                            (float)vp.left   / inputDesc.width,
                            (float)vp.bottom / inputDesc.height,
@@ -3007,8 +3020,9 @@ FrameGraphId<FrameGraphTexture> PostProcessManager::blit(FrameGraph& fg, bool tr
        SamplerMagFilter filterMag,
        SamplerMinFilter filterMin) noexcept {

-    uint32_t const layer = fg.getSubResourceDescriptor(input).layer;
-    float const levelOfDetail = fg.getSubResourceDescriptor(input).level;
+    // TODO: add support for sub-resources
+    assert_invariant(fg.getSubResourceDescriptor(input).layer == 0);
+    assert_invariant(fg.getSubResourceDescriptor(input).level == 0);

    struct QuadBlitData {
        FrameGraphId<FrameGraphTexture> input;
@@ -3034,8 +3048,7 @@ FrameGraphId<FrameGraphTexture> PostProcessManager::blit(FrameGraph& fg, bool tr
                // --------------------------------------------------------------------------------
                // set uniforms

-                PostProcessMaterial const& material =
-                        getPostProcessMaterial(layer ? "blitArray" : "blitLow");
+                PostProcessMaterial const& material = getPostProcessMaterial("blitLow");
                auto* mi = material.getMaterialInstance(mEngine);
                mi->setParameter("color", color, {
                        .filterMag = filterMag,
@@ -3047,10 +3060,6 @@ FrameGraphId<FrameGraphTexture> PostProcessManager::blit(FrameGraph& fg, bool tr
                        float(vp.width)  / inputDesc.width,
                        float(vp.height) / inputDesc.height
                });
-                mi->setParameter("levelOfDetail", levelOfDetail);
-                if (layer) {
-                    mi->setParameter("layerIndex", layer);
-                }
                mi->commit(driver);
                mi->use(driver);

@@ -419,7 +419,8 @@ RenderPass::Command* RenderPass::instanceify(FEngine& engine,
 UTILS_ALWAYS_INLINE // This function exists only to make the code more readable. we want it inlined.
 inline              // and we don't need it in the compilation unit
 void RenderPass::setupColorCommand(Command& cmdDraw, Variant variant,
-        FMaterialInstance const* const UTILS_RESTRICT mi, bool inverseFrontFaces) noexcept {
+        FMaterialInstance const* const UTILS_RESTRICT mi,
+        bool inverseFrontFaces, bool hasDepthClamp) noexcept {

    FMaterial const * const UTILS_RESTRICT ma = mi->getMaterial();
    variant = Variant::filterVariant(variant, ma->isVariantLit());
@@ -460,6 +461,7 @@ void RenderPass::setupColorCommand(Command& cmdDraw, Variant variant,
    cmdDraw.info.rasterState.colorWrite = mi->isColorWriteEnabled();
    cmdDraw.info.rasterState.depthWrite = mi->isDepthWriteEnabled();
    cmdDraw.info.rasterState.depthFunc = mi->getDepthFunc();
+    cmdDraw.info.rasterState.depthClamp = hasDepthClamp;
    cmdDraw.info.materialVariant = variant;
    // we keep "RasterState::colorWrite" to the value set by material (could be disabled)
 }
@@ -558,6 +560,9 @@ RenderPass::Command* RenderPass::generateCommandsImpl(RenderPass::CommandTypeFla
    bool const hasInstancedStereo =
            renderFlags & IS_INSTANCED_STEREOSCOPIC;

+    bool const hasDepthClamp =
+            renderFlags & HAS_DEPTH_CLAMP;
+
    float const cameraPositionDotCameraForward = dot(cameraPosition, cameraForward);

    auto const* const UTILS_RESTRICT soaWorldAABBCenter = soa.data<FScene::WORLD_AABB_CENTER>();
@@ -577,6 +582,7 @@ RenderPass::Command* RenderPass::generateCommandsImpl(RenderPass::CommandTypeFla
        cmd.info.rasterState.depthWrite = true;
        cmd.info.rasterState.depthFunc = RasterState::DepthFunc::GE;
        cmd.info.rasterState.alphaToCoverage = false;
+        cmd.info.rasterState.depthClamp = hasDepthClamp;
    }

    for (uint32_t i = range.first; i < range.last; ++i) {
@@ -691,7 +697,8 @@ RenderPass::Command* RenderPass::generateCommandsImpl(RenderPass::CommandTypeFla
            cmd.info.morphingOffset = primitive.getMorphingBufferOffset();

            if constexpr (isColorPass) {
-                RenderPass::setupColorCommand(cmd, renderableVariant, mi, inverseFrontFaces);
+                RenderPass::setupColorCommand(cmd, renderableVariant, mi,
+                        inverseFrontFaces, hasDepthClamp);
                const bool blendPass = Pass(cmd.key & PASS_MASK) == Pass::BLENDED;
                if (blendPass) {
                    // TODO: at least for transparent objects, AABB should be per primitive
@@ -284,6 +284,7 @@ public:
    static constexpr RenderFlags HAS_SHADOWING             = 0x01;
    static constexpr RenderFlags HAS_INVERSE_FRONT_FACES   = 0x02;
    static constexpr RenderFlags IS_INSTANCED_STEREOSCOPIC = 0x04;
+    static constexpr RenderFlags HAS_DEPTH_CLAMP           = 0x08;

    // Arena used for commands
    using Arena = utils::Arena<
@@ -444,7 +445,7 @@ private:
            uint8_t instancedStereoEyeCount) noexcept;

    static void setupColorCommand(Command& cmdDraw, Variant variant,
-            FMaterialInstance const* mi, bool inverseFrontFaces) noexcept;
+            FMaterialInstance const* mi, bool inverseFrontFaces, bool hasDepthClamp) noexcept;

    static void updateSummedPrimitiveCounts(
            FScene::RenderableSoa& renderableData, utils::Range<uint32_t> vr) noexcept;
@@ -829,13 +829,13 @@ ShadowMap::Corners ShadowMap::computeFrustumCorners(
    Corners const csViewFrustumCorners = {
            .vertices = {
                    { -1, -1, far  },
-                    { 1,  -1, far  },
-                    { -1, 1,  far  },
-                    { 1,  1,  far  },
+                    {  1, -1, far  },
+                    { -1,  1, far  },
+                    {  1,  1, far  },
                    { -1, -1, near },
-                    { 1,  -1, near },
-                    { -1, 1,  near },
-                    { 1,  1,  near },
+                    {  1, -1, near },
+                    { -1,  1, near },
+                    {  1,  1, near },
            }
    };

@@ -66,15 +66,15 @@ namespace filament {
 using namespace backend;
 using namespace math;

-// do this only if depth-clamp is available
-static constexpr bool USE_DEPTH_CLAMP = false;
-
-ShadowMapManager::ShadowMapManager(FEngine& engine) {
+ShadowMapManager::ShadowMapManager(FEngine& engine)
+    : mIsDepthClampSupported(engine.getDriverApi().isDepthClampSupported()) {
    FDebugRegistry& debugRegistry = engine.getDebugRegistry();
    debugRegistry.registerProperty("d.shadowmap.visualize_cascades",
            &engine.debug.shadowmap.visualize_cascades);
    debugRegistry.registerProperty("d.shadowmap.disable_light_frustum_align",
            &engine.debug.shadowmap.disable_light_frustum_align);
+    debugRegistry.registerProperty("d.shadowmap.depth_clamp",
+            &engine.debug.shadowmap.depth_clamp);
 }

 ShadowMapManager::~ShadowMapManager() {
@@ -367,7 +367,22 @@ FrameGraphId<FrameGraphTexture> ShadowMapManager::render(FEngine& engine, FrameG

                    // generate and sort the commands for rendering the shadow map

+                    RenderPass::RenderFlags renderPassFlags{};
+                    if (view.isFrontFaceWindingInverted()) {
+                        renderPassFlags |= RenderPass::HAS_INVERSE_FRONT_FACES;
+                    }
+
+                    bool const canUseDepthClamp =
+                            !view.hasVSM() &&
+                            mIsDepthClampSupported &&
+                            engine.debug.shadowmap.depth_clamp;
+
+                    if (canUseDepthClamp) {
+                        renderPassFlags |= RenderPass::HAS_DEPTH_CLAMP;
+                    }
+
                    RenderPass const pass = passBuilder
+                            .renderFlags(renderPassFlags)
                            .camera(cameraInfo)
                            .visibilityMask(entry.visibilityMask)
                            .geometry(scene->getRenderableData(),
@@ -641,8 +656,14 @@ ShadowMapManager::ShadowTechnique ShadowMapManager::updateCascadeShadowMaps(FEng
            cameraInfo.zf = -nearFarPlanes[i + 1];
            updateNearFarPlanes(&cameraInfo.cullingProjection, cameraInfo.zn, cameraInfo.zf);

+            bool const canUseDepthClamp =
+                    !view.hasVSM() &&
+                    mIsDepthClampSupported &&
+                    engine.debug.shadowmap.depth_clamp;
+
            auto shaderParameters = shadowMap.updateDirectional(engine,
-                    lightData, 0, cameraInfo, shadowMapInfo, sceneInfo, USE_DEPTH_CLAMP);
+                    lightData, 0, cameraInfo, shadowMapInfo, sceneInfo,
+                    canUseDepthClamp);

            if (shadowMap.hasVisibleShadows()) {
                const size_t shadowIndex = shadowMap.getShadowIndex();
@@ -232,6 +232,7 @@ private:
    ShadowMapCacheContainer mShadowMapCache;
    uint32_t mDirectionalShadowMapCount = 0;
    uint32_t mSpotShadowMapCount = 0;
+    bool const mIsDepthClampSupported;
    bool mInitialized = false;

    ShadowMap& getShadowMap(size_t index) noexcept {
@@ -588,9 +588,6 @@ void FRenderableManager::create(
            // full size of the UBO.
            instances.handle = driver.createBufferObject(sizeof(PerRenderableUib),
                    BufferObjectBinding::UNIFORM, backend::BufferUsage::DYNAMIC);
-            if (auto name = instances.buffer->getName(); !name.empty()) {
-                driver.setDebugTag(instances.handle.getId(), std::move(name));
-            }
        }

        const uint32_t boneCount = builder->mSkinningBoneCount;
@@ -20,8 +20,6 @@

 #include "FilamentAPI-impl.h"

-#include <utils/CString.h>
-
 namespace filament {

 struct BufferObject::BuilderDetails {
@@ -58,9 +56,6 @@ FBufferObject::FBufferObject(FEngine& engine, const BufferObject::Builder& build
    FEngine::DriverApi& driver = engine.getDriverApi();
    mHandle = driver.createBufferObject(builder->mByteCount, builder->mBindingType,
            backend::BufferUsage::STATIC);
-    if (auto name = builder.getName(); !name.empty()) {
-        driver.setDebugTag(mHandle.getId(), std::move(name));
-    }
 }

 void FBufferObject::terminate(FEngine& engine) {
@@ -28,12 +28,6 @@
 #include <string_view>
 #include <utility>

-#ifndef NDEBUG
-#   define DEBUG_PROPERTIES_WRITABLE true
-#else
-#   define DEBUG_PROPERTIES_WRITABLE false
-#endif
-
 using namespace filament::math;
 using namespace utils;

@@ -79,17 +73,15 @@ bool FDebugRegistry::hasProperty(const char* name) const noexcept {

 template<typename T>
 bool FDebugRegistry::setProperty(const char* name, T v) noexcept {
-    if constexpr (DEBUG_PROPERTIES_WRITABLE) {
-        auto info = getPropertyInfo(name);
-        T* const addr = static_cast<T*>(info.first);
-        if (addr) {
-            auto old = *addr;
-            *addr = v;
-            if (info.second && old != v) {
-                info.second();
-            }
-            return true;
+    auto info = getPropertyInfo(name);
+    T* const addr = static_cast<T*>(info.first);
+    if (addr) {
+        auto old = *addr;
+        *addr = v;
+        if (info.second && old != v) {
+            info.second();
        }
+        return true;
    }
    return false;
 }
@@ -600,6 +600,7 @@ public:
            bool focus_shadowcasters = true;
            bool visualize_cascades = false;
            bool disable_light_frustum_align = false;
+            bool depth_clamp = true;
            float dzn = -1.0f;
            float dzf =  1.0f;
            float display_shadow_texture_scale = 0.25f;
@@ -20,8 +20,6 @@

 #include "FilamentAPI-impl.h"

-#include <utils/CString.h>
-
 namespace filament {

 struct IndexBuffer::BuilderDetails {
@@ -60,9 +58,6 @@ FIndexBuffer::FIndexBuffer(FEngine& engine, const IndexBuffer::Builder& builder)
            (backend::ElementType)builder->mIndexType,
            uint32_t(builder->mIndexCount),
            backend::BufferUsage::STATIC);
-    if (auto name = builder.getName(); !name.empty()) {
-        driver.setDebugTag(mHandle.getId(), std::move(name));
-    }
 }

 void FIndexBuffer::terminate(FEngine& engine) {
@@ -61,8 +61,7 @@ InstanceBuffer* InstanceBuffer::Builder::build(Engine& engine) {

 // ------------------------------------------------------------------------------------------------

-FInstanceBuffer::FInstanceBuffer(FEngine& engine, const Builder& builder)
-    : mName(builder.getName()) {
+FInstanceBuffer::FInstanceBuffer(FEngine& engine, const Builder& builder) {
    mInstanceCount = builder->mInstanceCount;

    mLocalTransforms.reserve(mInstanceCount);
@@ -25,7 +25,6 @@

 #include <math/mat4.h>

-#include <utils/CString.h>
 #include <utils/FixedCapacityVector.h>

 namespace filament {
@@ -47,13 +46,10 @@ public:
    void prepare(FEngine& engine, math::mat4f rootTransform, const PerRenderableData& ubo,
            backend::Handle<backend::HwBufferObject> handle);

-    utils::CString const& getName() const noexcept { return mName; }
-
 private:
    friend class RenderableManager;

    utils::FixedCapacityVector<math::mat4f> mLocalTransforms;
-    utils::CString mName;
    size_t mInstanceCount;
 };

@@ -192,27 +192,19 @@ Material* Material::Builder::build(Engine& engine) {
        return nullptr;
    }

-    // Print a warning if the material's stereo type doesn't align with the engine's setting.
    MaterialDomain materialDomain;
-    UserVariantFilterMask variantFilterMask;
    materialParser->getMaterialDomain(&materialDomain);
-    materialParser->getMaterialVariantFilterMask(&variantFilterMask);
-    bool const hasStereoVariants = !(variantFilterMask & UserVariantFilterMask(UserVariantFilterBit::STE));
-    if (materialDomain == MaterialDomain::SURFACE && hasStereoVariants) {
+    if (materialDomain == MaterialDomain::SURFACE) {
        StereoscopicType const engineStereoscopicType = engine.getConfig().stereoscopicType;
-        // Default materials are always compiled with either 'instanced' or 'multiview'.
-        // So, we only verify compatibility if the engine is set up for stereo.
-        if (engineStereoscopicType != StereoscopicType::NONE) {
-            StereoscopicType materialStereoscopicType = StereoscopicType::NONE;
-            materialParser->getStereoscopicType(&materialStereoscopicType);
-            if (materialStereoscopicType != engineStereoscopicType) {
-                CString name;
-                materialParser->getName(&name);
-                slog.w << "The stereoscopic type in the compiled material '" << name.c_str_safe()
-                        << "' is " << (int)materialStereoscopicType
-                        << ", which is not compatiable with the engine's setting "
-                        << (int)engineStereoscopicType << "." << io::endl;
-            }
+        StereoscopicType materialStereoscopicType = StereoscopicType::NONE;
+        materialParser->getStereoscopicType(&materialStereoscopicType);
+        if (materialStereoscopicType != engineStereoscopicType) {
+            CString name;
+            materialParser->getName(&name);
+            slog.w << "The stereoscopic type in the compiled material '" << name.c_str_safe()
+                    << "' is " << (int)materialStereoscopicType
+                    << ", which is not compatiable with the engine's setting "
+                    << (int)engineStereoscopicType << "." << io::endl;
        }
    }

@@ -618,7 +610,6 @@ Program FMaterial::getProgramWithVariants(

 void FMaterial::createAndCacheProgram(Program&& p, Variant variant) const noexcept {
    auto program = mEngine.getDriverApi().createProgram(std::move(p));
-    mEngine.getDriverApi().setDebugTag(program.getId(), mName);
    assert_invariant(program);
    mCachedPrograms[variant.key] = program;
 }
@@ -51,7 +51,6 @@ FMaterialInstance::FMaterialInstance(FEngine& engine, FMaterial const* material)
        mUniforms = UniformBuffer(material->getUniformInterfaceBlock().getSize());
        mUbHandle = driver.createBufferObject(mUniforms.getSize(),
                BufferObjectBinding::UNIFORM, backend::BufferUsage::STATIC);
-        driver.setDebugTag(mUbHandle.getId(), material->getName());
    }

    if (!material->getSamplerInterfaceBlock().isEmpty()) {
@@ -117,7 +116,6 @@ FMaterialInstance::FMaterialInstance(FEngine& engine,
        mUniforms.setUniforms(other->getUniformBuffer());
        mUbHandle = driver.createBufferObject(mUniforms.getSize(),
                BufferObjectBinding::UNIFORM, backend::BufferUsage::DYNAMIC);
-        driver.setDebugTag(mUbHandle.getId(), material->getName());
    }

    if (!material->getSamplerInterfaceBlock().isEmpty()) {
@@ -25,8 +25,6 @@
 #include <math/mat4.h>
 #include <math/norm.h>

-#include <utils/CString.h>
-
 namespace filament {

 using namespace backend;
@@ -126,11 +124,6 @@ FMorphTargetBuffer::FMorphTargetBuffer(FEngine& engine, const Builder& builder)
            mCount,
            TextureUsage::DEFAULT);

-    if (auto name = builder.getName(); !name.empty()) {
-        driver.setDebugTag(mPbHandle.getId(), name);
-        driver.setDebugTag(mTbHandle.getId(), std::move(name));
-    }
-
    // create and update sampler group
    mSbHandle = driver.createSamplerGroup(PerRenderPrimitiveMorphingSib::SAMPLER_COUNT,
            utils::FixedSizeString<32>("Morph target samplers"));
@@ -597,6 +597,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
    bool hasColorGrading = hasPostProcess;
    bool hasDithering = view.getDithering() == Dithering::TEMPORAL;
    bool hasFXAA = view.getAntiAliasing() == AntiAliasing::FXAA;
+//    bool hasFXAA = false;//view.getAntiAliasing() == AntiAliasing::FXAA;
    float2 scale = view.updateScale(engine, mFrameInfoManager.getLastFrameInfo(), mFrameRateOptions, mDisplayInfo);
    auto msaaOptions = view.getMultiSampleAntiAliasingOptions();
    auto dsrOptions = view.getDynamicResolutionOptions();
@@ -610,6 +611,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
    auto guardBandOptions = view.getGuardBandOptions();
    const bool isRenderingMultiview = view.hasStereo() &&
            engine.getConfig().stereoscopicType == backend::StereoscopicType::MULTIVIEW;
+    utils::slog.e <<"hasFXAA=" <<hasFXAA << " view=" << &view << utils::io::endl;
    // FIXME: This is to override some settings that are not supported for multiview at the moment.
    // Remove this when all features are supported.
    if (isRenderingMultiview) {
@@ -703,6 +705,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
    const bool noBufferPadding = (colorGradingConfig.asSubpass && !hasFXAA && !scaled)
            || engine.debug.renderer.disable_buffer_padding;

+//    guardBandOptions.enabled = !noBufferPadding;    
    // guardBand must be a multiple of 16 to guarantee the same exact rendering up to 4 mip levels.
    float const guardBand = guardBandOptions.enabled ? 16.0f : 0.0f;

@@ -719,7 +722,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
        //       the SwapChain, and we might want to keep it this way.

        auto round = [](uint32_t x) {
-            constexpr uint32_t rounding = 16u;
+            constexpr uint32_t rounding = 256u;
            return (x + (rounding - 1u)) & ~(rounding - 1u);
        };

@@ -727,6 +730,9 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
        const float width  = float(round(svp.width )) + 2.0f * guardBand;
        const float height = float(round(svp.height)) + 2.0f * guardBand;

+        utils::slog.e << "new dim=" << width <<"x" << height <<
+                " old dim=" << svp.width << "x" << svp.height << utils::io::endl;
+
        // scale the field-of-view up, so it covers exactly the extra pixels
        const float3 clipSpaceScaling{
                float(svp.width)  / width,
@@ -744,9 +750,14 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
                1.0f - clipSpaceScaling.y - 2.0f * guardBand / height
        };

+        utils::slog.e <<"clipspace scaling=" << clipSpaceScaling << utils::io::endl;
+        utils::slog.e <<"clipspace translation=" << clipSpaceTranslation << utils::io::endl;        
+
        mat4f ts = mat4f::scaling(clipSpaceScaling);
        ts[3].xy = -clipSpaceTranslation;

+        utils::slog.e <<"mat=" << ts << utils::io::endl;
+
        // update the camera projection
        cameraInfo.projection = highPrecisionMultiply(ts, cameraInfo.projection);

@@ -759,6 +770,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
        svp.height = uint32_t(height);
        xvp.left   = int32_t(guardBand);
        xvp.bottom = int32_t(guardBand);
+        utils::slog.e <<"xvp.left=" << int32_t(guardBand) << utils::io::endl;
    }

    view.prepare(engine, driver, rootArenaScope, svp, cameraInfo, getShaderUserTime(), needsAlphaChannel);
@@ -870,6 +882,9 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {

    const TextureFormat hdrFormat = getHdrFormat(view, needsAlphaChannel);

+    utils::slog.e <<"padding=" << !noBufferPadding << " svp=" << svp << utils::io::endl;
+    utils::slog.e <<"padding=" << !noBufferPadding << " xvp=" << xvp << utils::io::endl;
+    
    // the clearFlags and clearColor specified below will only apply when rendering into the
    // temporary color buffer. In particular, they won't apply when rendering into the main
    // swapchain (imported render target above)
@@ -1074,6 +1089,9 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
            .format = config.hdrFormat
    };

+    utils::slog.e <<"color buffer output=" << colorBufferDesc.width <<"x" << colorBufferDesc.height
+                  << utils::io::endl;
+
    // Set the depth to the number of layers if we're rendering multiview.
    if (isRenderingMultiview) {
        colorBufferDesc.depth = engine.getConfig().stereoscopicEyeCount;
@@ -1227,11 +1245,13 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
                        bloomOptions, vignetteOptions);
                // the padded buffer is resolved now
                xvp.left = xvp.bottom = 0;
+                utils::slog.e <<"color grading is resolved" << utils::io::endl;
                svp = xvp;
            }
        }

        if (hasFXAA) {
+            utils::slog.e <<"fxaa=" << xvp << utils::io::endl;            
            input = ppm.fxaa(fg, input, xvp, colorGradingConfig.ldrFormat,
                    !hasColorGrading || needsAlphaChannel);
            // the padded buffer is resolved now
@@ -1245,6 +1265,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
                    .width = viewport.width, .height = viewport.height,
                    .format = colorGradingConfig.ldrFormat }, SamplerMagFilter::LINEAR);
            xvp.left = xvp.bottom = 0;
+            utils::slog.e <<"scaled" << utils::io::endl;            
            svp = xvp;
        }
    }
@@ -1277,6 +1298,9 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
    const bool outputIsSwapChain =
            (input == colorPassOutput) && (viewRenderTarget == mRenderTargetHandle);
    if (mightNeedFinalBlit) {
+        utils::slog.e <<"inside might need final blit xvp!=svp=" << (xvp != svp) <<
+                " xvp=" << xvp << " svp=" << svp << 
+                utils::io::endl;
        if (blendModeTranslucent ||
            xvp != svp ||
            (outputIsSwapChain &&
@@ -1285,6 +1309,7 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {
                    hasScreenSpaceRefraction ||
                    ssReflectionsOptions.enabled))) {
            assert_invariant(!scaled);
+            utils::slog.e <<"doing final blit " << svp << " " << xvp << utils::io::endl;
            input = ppm.blit(fg, blendModeTranslucent, input, xvp, {
                            .width = vp.width, .height = vp.height,
                            .format = colorGradingConfig.ldrFormat },
@@ -1314,6 +1339,10 @@ void FRenderer::renderJob(RootArenaScope& rootArenaScope, FView& view) {

    fg.forwardResource(fgViewRenderTarget, input);

+    utils::slog.e <<"present view=" << &view << " scaled=" << scaled << " mightNeedFinalBlit=" <<
+            mightNeedFinalBlit << 
+            utils::io::endl;
+    
    fg.present(fgViewRenderTarget);

    fg.compile();
@@ -27,8 +27,6 @@
 #include <math/half.h>
 #include <math/mat4.h>

-#include <utils/CString.h>
-
 #include <cstring>

 namespace filament {
@@ -82,11 +80,6 @@ FSkinningBuffer::FSkinningBuffer(FEngine& engine, const Builder& builder)
            BufferObjectBinding::UNIFORM,
            BufferUsage::DYNAMIC);

-    if (auto name = builder.getName(); !name.empty()) {
-        // TODO: We should also tag the texture created inside createIndicesAndWeightsHandle.
-        driver.setDebugTag(mHandle.getId(), std::move(name));
-    }
-
    if (builder->mInitialize) {
        // initialize the bones to identity (before rounding up)
        auto* out = driver.allocatePod<PerRenderableBoneUib::BoneData>(mBoneCount);
@@ -23,10 +23,10 @@

 #include <backend/PixelBufferDescriptor.h>

-#include <utils/CString.h>
 #include <utils/Panic.h>
 #include <filament/Stream.h>

+
 namespace filament {

 using namespace backend;
@@ -80,10 +80,6 @@ FStream::FStream(FEngine& engine, const Builder& builder) noexcept
    } else {
        mStreamHandle = engine.getDriverApi().createStreamAcquired();
    }
-
-    if (auto name = builder.getName(); !name.empty()) {
-        engine.getDriverApi().setDebugTag(mStreamHandle.getId(), std::move(name));
-    }
 }

 void FStream::terminate(FEngine& engine) noexcept {
@@ -243,9 +243,6 @@ FTexture::FTexture(FEngine& engine, const Builder& builder) {
        mHandle = driver.importTexture(builder->mImportedId,
                mTarget, mLevelCount, mFormat, mSampleCount, mWidth, mHeight, mDepth, mUsage);
    }
-    if (auto name = builder.getName(); !name.empty()) {
-        driver.setDebugTag(mHandle.getId(), std::move(name));
-    }
 }

 // frees driver resources, object becomes invalid
@@ -29,7 +29,6 @@

 #include <utils/bitset.h>
 #include <utils/compiler.h>
-#include <utils/CString.h>
 #include <utils/debug.h>
 #include <utils/Log.h>
 #include <utils/ostream.h>
@@ -260,9 +259,7 @@ FVertexBuffer::FVertexBuffer(FEngine& engine, const VertexBuffer::Builder& build
            mBufferCount, mDeclaredAttributes.count(), mAttributes);

    mHandle = driver.createVertexBuffer(mVertexCount, mVertexBufferInfoHandle);
-    if (auto name = builder.getName(); !name.empty()) {
-        driver.setDebugTag(mHandle.getId(), name);
-    }
+

    // calculate buffer sizes
    size_t bufferSizes[MAX_VERTEX_BUFFER_COUNT] = {};
@@ -290,9 +287,6 @@ FVertexBuffer::FVertexBuffer(FEngine& engine, const VertexBuffer::Builder& build
                if (!mBufferObjects[i]) {
                    BufferObjectHandle bo = driver.createBufferObject(bufferSizes[i],
                            backend::BufferObjectBinding::VERTEX, backend::BufferUsage::STATIC);
-                    if (auto name = builder.getName(); !name.empty()) {
-                        driver.setDebugTag(bo.getId(), name);
-                    }
                    driver.setVertexBufferObject(mHandle, i, bo);
                    mBufferObjects[i] = bo;
                }
@@ -309,9 +303,6 @@ FVertexBuffer::FVertexBuffer(FEngine& engine, const VertexBuffer::Builder& build
                if (!mBufferObjects[i]) {
                    BufferObjectHandle const bo = driver.createBufferObject(bufferSizes[i],
                            backend::BufferObjectBinding::VERTEX, backend::BufferUsage::STATIC);
-                    if (auto name = builder.getName(); !name.empty()) {
-                        driver.setDebugTag(bo.getId(), name);
-                    }
                    driver.setVertexBufferObject(mHandle, i, bo);
                    mBufferObjects[i] = bo;
                }
@@ -10,10 +10,6 @@ material {
            type : int,
            name : layerIndex
        },
-        {
-            type : float,
-            name : levelOfDetail,
-        },
        {
            type : float4,
            name : viewport,
@@ -37,6 +33,6 @@ vertex {

 fragment {
    void postProcess(inout PostProcessInputs postProcess) {
-        postProcess.color = textureLod(materialParams_color, vec3(variable_vertex.xy, materialParams.layerIndex), materialParams.levelOfDetail);
+        postProcess.color = textureLod(materialParams_color, vec3(variable_vertex.xy, materialParams.layerIndex), 0.0);
    }
 }
@@ -10,10 +10,6 @@ material {
            type : float4,
            name : viewport,
            precision: high
-        },
-        {
-            type : float,
-            name : levelOfDetail,
        }
    ],
    variables : [
@@ -37,7 +33,7 @@ fragment {
 #if FILAMENT_EFFECTIVE_VERSION == 100
        postProcess.color = texture2D(materialParams_color, variable_vertex.xy);
 #else
-        postProcess.color = textureLod(materialParams_color, variable_vertex.xy, materialParams.levelOfDetail);
+        postProcess.color = textureLod(materialParams_color, variable_vertex.xy, 0.0);
 #endif
    }
 }
@@ -323,9 +323,6 @@ public:
    //! Custom variables (all float4).
    MaterialBuilder& variable(Variable v, const char* name) noexcept;

-    MaterialBuilder& variable(Variable v, const char* name,
-            ParameterPrecision precision) noexcept;
-
    /**
     * Require a specified attribute.
     *
@@ -711,17 +708,11 @@ public:
        ShaderStage stage;
    };

-    struct CustomVariable {
-        utils::CString name;
-        Precision precision = Precision::DEFAULT;
-        bool hasPrecision = false;
-    };
-
    static constexpr size_t MATERIAL_PROPERTIES_COUNT = filament::MATERIAL_PROPERTIES_COUNT;
    using Property = filament::Property;

    using PropertyList = bool[MATERIAL_PROPERTIES_COUNT];
-    using VariableList = CustomVariable[MATERIAL_VARIABLES_COUNT];
+    using VariableList = utils::CString[MATERIAL_VARIABLES_COUNT];
    using OutputList = std::vector<Output>;

    static constexpr size_t MAX_COLOR_OUTPUT = filament::backend::MRT::MAX_SUPPORTED_RENDER_TARGET_COUNT;
@@ -671,15 +671,13 @@ void GLSLPostProcessor::fixupClipDistance(
 // - triggers a crash on some Adreno drivers (b/291140208, b/289401984, b/289393290)
 // However Metal requires this pass in order to correctly generate half-precision MSL
 //
-// Note: CreateSimplificationPass() used to creates a lot of problems:
+// CreateSimplificationPass() creates a lot of problems:
 // - Adreno GPU show artifacts after running simplification passes (Vulkan)
 // - spirv-cross fails generating working glsl
 //      (https://github.com/KhronosGroup/SPIRV-Cross/issues/2162)
-//
-// However this problem was addressed in spirv-cross here:
-//      https://github.com/KhronosGroup/SPIRV-Cross/pull/2163
-//
-// The simplification passes below are necessary when targeting Metal, otherwise the
+// - generally it makes the code more complicated, e.g.: replacing for loops with
+//   while-if-break, unclear if it helps for anything.
+// However, the simplification passes below are necessary when targeting Metal, otherwise the
 // result is mismatched half / float assignments in MSL.


@@ -712,11 +710,11 @@ void GLSLPostProcessor::registerPerformancePasses(Optimizer& optimizer, Config c
    RegisterPass(CreateAggressiveDCEPass());
    RegisterPass(CreateRedundancyEliminationPass());
    RegisterPass(CreateCombineAccessChainsPass());
-    RegisterPass(CreateSimplificationPass());
+    RegisterPass(CreateSimplificationPass(), MaterialBuilder::TargetApi::METAL);
    RegisterPass(CreateVectorDCEPass());
    RegisterPass(CreateDeadInsertElimPass());
    RegisterPass(CreateDeadBranchElimPass());
-    RegisterPass(CreateSimplificationPass());
+    RegisterPass(CreateSimplificationPass(), MaterialBuilder::TargetApi::METAL);
    RegisterPass(CreateIfConversionPass());
    RegisterPass(CreateCopyPropagateArraysPass());
    RegisterPass(CreateReduceLoadSizePass());
@@ -725,7 +723,7 @@ void GLSLPostProcessor::registerPerformancePasses(Optimizer& optimizer, Config c
    RegisterPass(CreateRedundancyEliminationPass());
    RegisterPass(CreateDeadBranchElimPass());
    RegisterPass(CreateBlockMergePass());
-    RegisterPass(CreateSimplificationPass());
+    RegisterPass(CreateSimplificationPass(), MaterialBuilder::TargetApi::METAL);
 }

 void GLSLPostProcessor::registerSizePasses(Optimizer& optimizer, Config const& config) {
@@ -234,21 +234,7 @@ MaterialBuilder& MaterialBuilder::variable(Variable v, const char* name) noexcep
        case Variable::CUSTOM2:
        case Variable::CUSTOM3:
            assert(size_t(v) < MATERIAL_VARIABLES_COUNT);
-            mVariables[size_t(v)] = { CString(name), Precision::DEFAULT, false };
-            break;
-    }
-    return *this;
-}
-
-MaterialBuilder& MaterialBuilder::variable(Variable v,
-        const char* name, ParameterPrecision precision) noexcept {
-    switch (v) {
-        case Variable::CUSTOM0:
-        case Variable::CUSTOM1:
-        case Variable::CUSTOM2:
-        case Variable::CUSTOM3:
-            assert(size_t(v) < MATERIAL_VARIABLES_COUNT);
-            mVariables[size_t(v)] = { CString(name), precision, true };
+            mVariables[size_t(v)] = CString(name);
            break;
    }
    return *this;
@@ -1397,7 +1383,7 @@ bool MaterialBuilder::checkMaterialLevelFeatures(MaterialInfo const& info) const

 bool MaterialBuilder::hasCustomVaryings() const noexcept {
    for (const auto& variable : mVariables) {
-        if (!variable.name.empty()) {
+        if (!variable.empty()) {
            return true;
        }
    }
@@ -451,20 +451,15 @@ io::sstream& CodeGenerator::generatePostProcessMain(io::sstream& out, ShaderStag
 }

 io::sstream& CodeGenerator::generateVariable(io::sstream& out, ShaderStage stage,
-        const MaterialBuilder::CustomVariable& variable, size_t index) {
-    auto const& name = variable.name;
-    const char* precisionString = getPrecisionQualifier(variable.precision);
+        const CString& name, size_t index) {
+
    if (!name.empty()) {
        if (stage == ShaderStage::VERTEX) {
            out << "\n#define VARIABLE_CUSTOM" << index << " " << name.c_str() << "\n";
            out << "\n#define VARIABLE_CUSTOM_AT" << index << " variable_" << name.c_str() << "\n";
-            out << "LAYOUT_LOCATION(" << index << ") VARYING " << precisionString << " vec4 variable_" << name.c_str() << ";\n";
+            out << "LAYOUT_LOCATION(" << index << ") VARYING vec4 variable_" << name.c_str() << ";\n";
        } else if (stage == ShaderStage::FRAGMENT) {
-            if (!variable.hasPrecision && variable.precision == Precision::DEFAULT) {
-                // for backward compatibility
-                precisionString = "highp";
-            }
-            out << "\nLAYOUT_LOCATION(" << index << ") VARYING " << precisionString << " vec4 variable_" << name.c_str() << ";\n";
+            out << "\nLAYOUT_LOCATION(" << index << ") VARYING highp vec4 variable_" << name.c_str() << ";\n";
        }
    }
    return out;
@@ -103,7 +103,7 @@ public:

    // generate declarations for custom interpolants
    static utils::io::sstream& generateVariable(utils::io::sstream& out, ShaderStage stage,
-            const MaterialBuilder::CustomVariable& variable, size_t index);
+            const utils::CString& name, size_t index);

    // generate declarations for non-custom "in" variables
    utils::io::sstream& generateShaderInputs(utils::io::sstream& out, ShaderStage type,
@@ -56,13 +56,7 @@ bool operator==(const MaterialKey& k1, const MaterialKey& k2) {
        (k1.volumeThicknessUV == k2.volumeThicknessUV) &&
        (k1.hasSheen == k2.hasSheen) &&
        (k1.hasIOR == k2.hasIOR) &&
-        (k1.hasVolume == k2.hasVolume) &&
-        (k1.hasSpecular == k2.hasSpecular) &&
-        (k1.hasSpecularTexture == k2.hasSpecularTexture) &&
-        (k1.hasSpecularColorTexture == k2.hasSpecularColorTexture) &&
-        (k1.specularTextureUV == k2.specularTextureUV) &&
-        (k1.specularColorTextureUV == k2.specularColorTextureUV)
-        ;
+        (k1.hasVolume == k2.hasVolume);
 }

 // Filament supports up to 2 UV sets. glTF has arbitrary texcoord set indices, but it allows
@@ -259,24 +259,6 @@ MaterialInstance* UbershaderProvider::createMaterialInstance(MaterialKey* config
    mi->setParameter("occlusionUvMatrix", identity);
    mi->setParameter("emissiveUvMatrix", identity);

-    // set to -1 all possibly optional parameters
-    for (auto const* param : {
-            "clearCoatIndex",
-            "clearCoatRoughnessIndex",
-            "clearCoatNormalIndex",
-            "sheenColorIndex",
-            "sheenRoughnessIndex",
-            "volumeThicknessUvMatrix",
-            "volumeThicknessIndex",
-            "transmissionIndex",
-            "specularIndex",
-            "specularColorIndex",
-    }) {
-        if (material->hasParameter(param)) {
-            mi->setParameter(param, -1);
-        }
-    }
-
    if (config->hasClearCoat) {
        mi->setParameter("clearCoatIndex",
                getUvIndex(config->clearCoatUV, config->hasClearCoatTexture));
@@ -358,10 +340,10 @@ MaterialInstance* UbershaderProvider::createMaterialInstance(MaterialKey* config
        mi->setParameter("sheenRoughnessMap", mDummyTexture, sampler);
    }

-    if (material->hasParameter("ior")) {
+    if (mi->getMaterial()->hasParameter("ior")) {
        mi->setParameter("ior", 1.5f);
    }
-    if (material->hasParameter("reflectance")) {
+    if (mi->getMaterial()->hasParameter("reflectance")) {
        mi->setParameter("reflectance", 0.5f);
    }

@@ -373,14 +355,6 @@ MaterialInstance* UbershaderProvider::createMaterialInstance(MaterialKey* config
        mi->setParameter("specularColorMap", mDummyTexture, sampler);
    }

-    if (material->hasParameter("specularColorFactor")) {
-        mi->setParameter("specularColorFactor", float3(1.0f));
-    }
-
-    if (material->hasParameter("specularStrength")) {
-        mi->setParameter("specularStrength", 1.0f);
-    }
-
    return mi;
 }

@@ -527,13 +527,11 @@ bool AssetLoaderExtended::createPrimitive(Input* input, Output* out,

    if (!mCgltfBuffersLoaded) {
        mCgltfBuffersLoaded = utility::loadCgltfBuffers(gltf, mGltfPath.c_str(), mUriDataCache);
-        if (!mCgltfBuffersLoaded) {
-            return false;
-        }
-        utility::decodeMeshoptCompression(gltf);
+        if (!mCgltfBuffersLoaded) return false;
    }

    utility::decodeDracoMeshes(gltf, prim, input->dracoCache);
+    utility::decodeMeshoptCompression(gltf);

    auto slots = computeGeometries(prim, jobType, attributesMap, morphTargets, out->uvmap, mEngine);

@@ -562,6 +562,8 @@ int parse(jsmntok_t const* tokens, int i, const char* jsonChunk, Settings* out)
 }

 void applySettings(Engine* engine, const ViewSettings& settings, View* dest) {
+    utils::slog.e << "antialiasing=" << (int) settings.antiAliasing << " view=" << dest
+                  << utils::io::endl;
    dest->setAntiAliasing(settings.antiAliasing);
    dest->setTemporalAntiAliasingOptions(settings.taa);
    dest->setMultiSampleAntiAliasingOptions(settings.msaa);
@@ -276,7 +276,7 @@ if (NOT ANDROID)
    target_link_libraries(hellopbr PRIVATE filameshio suzanne-resources)
    target_link_libraries(image_viewer PRIVATE viewer imageio)
    target_link_libraries(multiple_windows PRIVATE filameshio suzanne-resources)
-    target_link_libraries(rendertarget PRIVATE filameshio suzanne-resources)
+    target_link_libraries(rendertarget PRIVATE gltf-demo-resources filameshio suzanne-resources gltfio viewer)
    target_link_libraries(sample_cloth PRIVATE filameshio)
    target_link_libraries(sample_normal_map PRIVATE filameshio)
    target_link_libraries(suzanne PRIVATE filameshio suzanne-resources)
@@ -905,6 +905,8 @@ int main(int argc, char** argv) {
                        debug.getPropertyAddress<bool>("d.shadowmap.focus_shadowcasters"));
                ImGui::Checkbox("Disable light frustum alignment",
                        debug.getPropertyAddress<bool>("d.shadowmap.disable_light_frustum_align"));
+                ImGui::Checkbox("Depth clamp",
+                        debug.getPropertyAddress<bool>("d.shadowmap.depth_clamp"));

                bool debugDirectionalShadowmap;
                if (debug.getProperty("d.shadowmap.debug_directional_shadowmap",
@@ -20,7 +20,6 @@
 #include <filament/Material.h>
 #include <filament/MaterialInstance.h>
 #include <filament/RenderableManager.h>
-#include <filament/Renderer.h>
 #include <filament/Scene.h>
 #include <filament/Skybox.h>
 #include <filament/TransformManager.h>
@@ -47,33 +46,23 @@ using utils::EntityManager;
 struct App {
    Config config;
    VertexBuffer* vb;
-    VertexBuffer* vb2;
    IndexBuffer* ib;
    Material* mat;
    Camera* cam;
    Entity camera;
    Skybox* skybox;
    Entity renderable;
-    Entity r2;
 };

 struct Vertex {
-    filament::math::float3 position;
+    filament::math::float2 position;
    uint32_t color;
 };

-float const z = 5;
-
 static const Vertex TRIANGLE_VERTICES[3] = {
-    {{1, 0, z}, 0xffff0000u},
-    {{cos(M_PI * 2 / 3), sin(M_PI * 2 / 3), z}, 0xff00ff00u},
-    {{cos(M_PI * 4 / 3), sin(M_PI * 4 / 3), z}, 0xff0000ffu},
-};
-
-static Vertex T2[3] = {
-        TRIANGLE_VERTICES[0],
-        TRIANGLE_VERTICES[1],
-        TRIANGLE_VERTICES[2],
+    {{1, 0}, 0xffff0000u},
+    {{cos(M_PI * 2 / 3), sin(M_PI * 2 / 3)}, 0xff00ff00u},
+    {{cos(M_PI * 4 / 3), sin(M_PI * 4 / 3)}, 0xff0000ffu},
 };

 static constexpr uint16_t TRIANGLE_INDICES[3] = { 0, 1, 2 };
@@ -131,39 +120,25 @@ static int handleCommandLineArguments(int argc, char* argv[], App* app) {
 }

 int main(int argc, char** argv) {
-    T2[0].position.z = z - 10;
-    T2[1].position.z = z - 10;
-    T2[2].position.z = z - 10;
-
-    T2[0].color = 0xFF0000FF;
-    T2[1].color = 0xFF0000FF;
-    T2[2].color = 0xFF0000FF;
-
    App app{};
    app.config.title = "hellotriangle";
    app.config.featureLevel = backend::FeatureLevel::FEATURE_LEVEL_0;
    handleCommandLineArguments(argc, argv, &app);

    auto setup = [&app](Engine* engine, View* view, Scene* scene) {
+        app.skybox = Skybox::Builder().color({0.1, 0.125, 0.25, 1.0}).build(*engine);
+        scene->setSkybox(app.skybox);
        view->setPostProcessingEnabled(false);
-        view->setStencilBufferEnabled(true);
-
-        
-//        app.skybox = Skybox::Builder().color({0.1, 0.125, 0.25, 1.0}).build(*engine);
-//        scene->setSkybox(app.skybox);
-        static_assert(sizeof(Vertex) == 16, "Strange vertex size.");
-        auto builder = VertexBuffer::Builder()
+        static_assert(sizeof(Vertex) == 12, "Strange vertex size.");
+        app.vb = VertexBuffer::Builder()
                .vertexCount(3)
                .bufferCount(1)
-                .attribute(VertexAttribute::POSITION, 0, VertexBuffer::AttributeType::FLOAT3, 0, 16)
-                .attribute(VertexAttribute::COLOR, 0, VertexBuffer::AttributeType::UBYTE4, 12, 16)
-                .normalized(VertexAttribute::COLOR);
-        app.vb = builder.build(*engine);
-        app.vb2 = builder.build(*engine);
+                .attribute(VertexAttribute::POSITION, 0, VertexBuffer::AttributeType::FLOAT2, 0, 12)
+                .attribute(VertexAttribute::COLOR, 0, VertexBuffer::AttributeType::UBYTE4, 8, 12)
+                .normalized(VertexAttribute::COLOR)
+                .build(*engine);
        app.vb->setBufferAt(*engine, 0,
-                VertexBuffer::BufferDescriptor(TRIANGLE_VERTICES, 48, nullptr));
-        app.vb2->setBufferAt(*engine, 0,
-                VertexBuffer::BufferDescriptor(T2, 48, nullptr));
+                VertexBuffer::BufferDescriptor(TRIANGLE_VERTICES, 36, nullptr));
        app.ib = IndexBuffer::Builder()
                .indexCount(3)
                .bufferType(IndexBuffer::IndexType::USHORT)
@@ -174,67 +149,22 @@ int main(int argc, char** argv) {
                .package(RESOURCES_BAKEDCOLOR_DATA, RESOURCES_BAKEDCOLOR_SIZE)
                .build(*engine);
        app.renderable = EntityManager::get().create();
-        app.r2 = EntityManager::get().create();
-
-        auto inst1 = app.mat->createInstance();
-        inst1->setDepthWrite(false);        
-        inst1->setDepthFunc(MaterialInstance::DepthFunc::A);        
-        inst1->setDepthCulling(false);
-        
-        inst1->setStencilWrite(true);
-        inst1->setStencilCompareFunction(MaterialInstance::StencilCompareFunc::E);
-        inst1->setStencilOpDepthStencilPass(MaterialInstance::StencilOperation::REPLACE);
-        inst1->setStencilReferenceValue(6);
-
-        auto inst2 = app.mat->createInstance();
-        inst2->setDepthWrite(false);
-        inst2->setDepthFunc(MaterialInstance::DepthFunc::A);
-        inst2->setDepthCulling(false);
-        
-        inst2->setStencilWrite(true);
-        inst2->setStencilCompareFunction(MaterialInstance::StencilCompareFunc::L);
-        inst2->setStencilOpDepthStencilPass(MaterialInstance::StencilOperation::REPLACE);
-        inst2->setStencilReferenceValue(6);
-
-
-        auto& renderableMan = engine->getRenderableManager();
-
        RenderableManager::Builder(1)
                .boundingBox({{ -1, -1, -1 }, { 1, 1, 1 }})
-                .material(0, inst1)
+                .material(0, app.mat->getDefaultInstance())
                .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.vb, app.ib, 0, 3)
                .culling(false)
                .receiveShadows(false)
                .castShadows(false)
                .build(*engine, app.renderable);
-
-
-        RenderableManager::Builder(1)
-                .boundingBox({{ -1, -1, -1 }, { 1, 1, 1 }})
-                .material(0, inst2)
-                .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.vb2, app.ib, 0, 3)
-                .culling(false)
-                .receiveShadows(false)
-                .castShadows(false)
-                .build(*engine, app.r2);
-
        scene->addEntity(app.renderable);
-
-
-        auto r1inst = renderableMan.getInstance(app.renderable);
-        renderableMan.setPriority(r1inst, 7);
-
-        scene->addEntity(app.r2);        
-        auto r2inst = renderableMan.getInstance(app.r2);
-        renderableMan.setPriority(r2inst, 6);
-
        app.camera = utils::EntityManager::get().create();
        app.cam = engine->createCamera(app.camera);
        view->setCamera(app.cam);
    };

    auto cleanup = [&app](Engine* engine, View*, Scene*) {
-//        engine->destroy(app.skybox);
+        engine->destroy(app.skybox);
        engine->destroy(app.renderable);
        engine->destroy(app.mat);
        engine->destroy(app.vb);
@@ -244,24 +174,19 @@ int main(int argc, char** argv) {
    };

    FilamentApp::get().animate([&app](Engine* engine, View* view, double now) {
-        constexpr float ZOOM = 1.5;
+        constexpr float ZOOM = 1.5f;
        const uint32_t w = view->getViewport().width;
        const uint32_t h = view->getViewport().height;
        const float aspect = (float) w / h;
        app.cam->setProjection(Camera::Projection::ORTHO,
            -aspect * ZOOM, aspect * ZOOM,
-            -ZOOM, ZOOM, -100, 100);
+            -ZOOM, ZOOM, 0, 1);
        auto& tcm = engine->getTransformManager();
        tcm.setTransform(tcm.getInstance(app.renderable),
                filament::math::mat4f::rotation(now, filament::math::float3{ 0, 0, 1 }));
    });

-
-    auto preRender = [](Engine*, View* view, Scene*, Renderer* renderer) {
-        renderer->setClearOptions({ .clearStencil = 0u, .clear = true,  });
-    };
-
-    FilamentApp::get().run(app.config, setup, cleanup, {}, preRender);
+    FilamentApp::get().run(app.config, setup, cleanup);

    return 0;
 }
@@ -12,6 +12,8 @@ material {
        uv0
    ],
    shadingModel : unlit,
+    vertexDomain: device,
+//    vertexDomainDeviceJittered: true,
 }

 fragment {
@@ -20,17 +22,11 @@ fragment {
        if (gl_FrontFacing) {

            // Make a lookup into the mirror texture.
-            vec2 uv = getResolution().zw * gl_FragCoord.xy;
+//            vec2 uv = getResolution().zw * gl_FragCoord.xy;
+            vec2 uv = getNormalizedViewportCoord().xy;
            material.baseColor.rgb = texture(materialParams_albedo, uv).rgb;
-
-            // Add black borders to the mirror.
-            vec2 st = getUV0();
-            float minDist0 = min(st.x, st.y);
-            float minDist1 = min(1.0 - st.x, 1.0 - st.y);
-            float minDist = min(minDist0, minDist1);
-            material.baseColor.rgb *= smoothstep(0.0, 0.1, minDist);
-
+        } else {
+             material.baseColor = vec4(1, 0, 0, 1);
        }
-        material.baseColor.a = 1.0;
    }
 }
@@ -28,10 +28,17 @@
 #include <filament/VertexBuffer.h>
 #include <filament/View.h>

+#include <gltfio/AssetLoader.h>
+#include <gltfio/FilamentAsset.h>
+#include <gltfio/ResourceLoader.h>
+#include <gltfio/TextureProvider.h>
+#include <utils/NameComponentManager.h>
 #include <utils/EntityManager.h>

+#include <imgui.h>
+#include <filagui/ImGuiExtensions.h>
+#include <viewer/ViewerGui.h>
 #include <filameshio/MeshReader.h>
-
 #include <filamentapp/Config.h>
 #include <filamentapp/FilamentApp.h>

@@ -40,11 +47,16 @@
 #include <iostream>

 #include "generated/resources/resources.h"
-#include "generated/resources/monkey.h"
+//#include "generated/resources/monkey.h"
+#include "generated/resources/gltf_demo.h"

 using namespace filament;
 using namespace filamesh;
 using namespace filament::math;
+using namespace filament::viewer;
+using namespace filament::gltfio;
+
+#include <utils/Log.h>

 struct Vertex {
    float3 position;
@@ -55,8 +67,6 @@ struct App {
    utils::Entity lightEntity;
    Material* meshMaterial;
    MaterialInstance* meshMatInstance;
-    MeshReader::Mesh monkeyMesh;
-    utils::Entity reflectedMonkey;
    mat4f transform;

    Texture* offscreenColorTexture = nullptr;
@@ -66,12 +76,6 @@ struct App {
    Scene* offscreenScene = nullptr;
    Camera* offscreenCamera = nullptr;

-    enum class ReflectionMode {
-        RENDERABLES,
-        CAMERA,
-    };
-
-    ReflectionMode mode = ReflectionMode::CAMERA;
    Config config;

    utils::Entity quadEntity;
@@ -80,46 +84,22 @@ struct App {
    Material* quadMaterial = nullptr;
    MaterialInstance* quadMatInstance = nullptr;

-    float3 quadCenter;
-    float3 quadNormal;
+    MaterialProvider* materials;
+
+    AssetLoader* assetLoader;
+    ResourceLoader* resourceLoader;
+    FilamentAsset* asset = nullptr;
+    utils::NameComponentManager* names;
+    gltfio::TextureProvider* stbDecoder = nullptr;
+    gltfio::TextureProvider* ktxDecoder = nullptr;
+
+    Engine* engine;
+
+    ViewerGui* viewer;
+    utils::Entity rootTransformEntity;
 };

-static mat4f reflectionMatrix(float4 plane) {
-    mat4f m;
-    m[0][0] = -2 * plane.x * plane.x + 1;
-    m[0][1] = -2 * plane.x * plane.y;
-    m[0][2] = -2 * plane.x * plane.z;
-    m[0][3] = -2 * plane.x * plane.w;
-    m[1][0] = -2 * plane.x * plane.y;
-    m[1][1] = -2 * plane.y * plane.y + 1;
-    m[1][2] = -2 * plane.y * plane.z;
-    m[1][3] = -2 * plane.y * plane.w;
-    m[2][0] = -2 * plane.z * plane.x;
-    m[2][1] = -2 * plane.z * plane.y;
-    m[2][2] = -2 * plane.z * plane.z + 1;
-    m[2][3] = -2 * plane.z * plane.w;
-    m[3][0] = 0;
-    m[3][1] = 0;
-    m[3][2] = 0;
-    m[3][3] = 1;
-    return transpose(m);
-}
-
-static void setReflectionMode(App& app, App::ReflectionMode mode) {
-    switch (mode) {
-    case App::ReflectionMode::RENDERABLES:
-        app.offscreenScene->addEntity(app.reflectedMonkey);
-        app.offscreenScene->remove(app.monkeyMesh.renderable);
-        app.offscreenView->setFrontFaceWindingInverted(false);
-        break;
-    case App::ReflectionMode::CAMERA:
-        app.offscreenScene->addEntity(app.monkeyMesh.renderable);
-        app.offscreenScene->remove(app.reflectedMonkey);
-        app.offscreenView->setFrontFaceWindingInverted(true);
-        break;
-    }
-    app.mode = mode;
-}
+static const char* DEFAULT_IBL = "assets/ibl/lightroom_14b";

 static void printUsage(char* name) {
    std::string exec_name(utils::Path(name).getName());
@@ -172,14 +152,6 @@ static int handleCommandLineArguments(int argc, char* argv[], App* app) {
                }
                break;
            case 'm':
-                if (arg == "camera") {
-                    app->mode = App::ReflectionMode::CAMERA;
-                } else if (arg == "renderables") {
-                    app->mode = App::ReflectionMode::RENDERABLES;
-                } else {
-                    std::cerr << "Unrecognized mode. Must be 'camera'|'renderables'.\n";
-                    exit(1);
-                }
                break;
        }
    }
@@ -189,126 +161,182 @@ static int handleCommandLineArguments(int argc, char* argv[], App* app) {
 int main(int argc, char** argv) {
    App app{};
    app.config.title = "rendertarget";
+    app.config.iblDirectory = FilamentApp::getRootAssetsPath() + DEFAULT_IBL;
    handleCommandLineArguments(argc, argv, &app);

-    auto setup = [&app](Engine* engine, View* view, Scene* scene) {
+    auto gui = [&app](Engine*, View*) {
+        app.viewer->updateUserInterface();
+        FilamentApp::get().setSidebarWidth(app.viewer->getSidebarWidth());
+    };
+
+    auto loadResources = [&app] () {
+        // Load external textures and buffers.
+        std::string const gltfPath;
+        ResourceConfiguration configuration = {};
+        configuration.engine = app.engine;
+        configuration.gltfPath = gltfPath.c_str();
+        configuration.normalizeSkinningWeights = true;
+
+        app.resourceLoader = new gltfio::ResourceLoader(configuration);
+        app.stbDecoder = createStbProvider(app.engine);
+        app.ktxDecoder = createKtx2Provider(app.engine);
+        app.resourceLoader->addTextureProvider("image/png", app.stbDecoder);
+        app.resourceLoader->addTextureProvider("image/jpeg", app.stbDecoder);
+        app.resourceLoader->addTextureProvider("image/ktx2", app.ktxDecoder);
+
+        if (!app.resourceLoader->loadResources(app.asset)) {
+            std::cerr << "Unable to start loading resources" << std::endl;
+            exit(1);
+        }
+
+        app.asset->getInstance()->recomputeBoundingBoxes();
+        app.asset->releaseSourceData();
+
+        // Enable stencil writes on all material instances.
+        auto instance = app.asset->getInstance();
+        const size_t matInstanceCount = instance->getMaterialInstanceCount();
+        MaterialInstance* const* const instances = instance->getMaterialInstances();
+        for (int mi = 0; mi < matInstanceCount; mi++) {
+            instances[mi]->setStencilWrite(true);
+            instances[mi]->setStencilOpDepthStencilPass(MaterialInstance::StencilOperation::INCR);
+        }
+
+        auto ibl = FilamentApp::get().getIBL();
+        if (ibl) {
+            app.viewer->setIndirectLight(ibl->getIndirectLight(), ibl->getSphericalHarmonics());
+            app.viewer->getSettings().view.fogSettings.fogColorTexture = ibl->getFogTexture();
+        }
+    };
+
+    auto setup = [&app, loadResources](Engine* engine, View* view, Scene* scene) {
+        app.engine = engine;
+        auto& em = utils::EntityManager::get();
        auto& tcm = engine->getTransformManager();
        auto& rcm = engine->getRenderableManager();
-        auto& em = utils::EntityManager::get();
-        auto vp = view->getViewport();
+        
+        // Offscreen view
+        {
+            // Instantiate offscreen render target.
+            app.offscreenView = engine->createView();
+            app.offscreenScene = engine->createScene();
+            app.offscreenView->setScene(app.offscreenScene);

-        // Instantiate offscreen render target.
-        app.offscreenView = engine->createView();
-        app.offscreenScene = engine->createScene();
-        app.offscreenView->setScene(app.offscreenScene);
-        app.offscreenView->setPostProcessingEnabled(false);
-        app.offscreenColorTexture = Texture::Builder()
-            .width(vp.width).height(vp.height).levels(1)
-            .usage(Texture::Usage::COLOR_ATTACHMENT | Texture::Usage::SAMPLEABLE)
-            .format(Texture::InternalFormat::RGBA8).build(*engine);
-        app.offscreenDepthTexture = Texture::Builder()
-            .width(vp.width).height(vp.height).levels(1)
-            .usage(Texture::Usage::DEPTH_ATTACHMENT)
-            .format(Texture::InternalFormat::DEPTH24).build(*engine);
-        app.offscreenRenderTarget = RenderTarget::Builder()
-            .texture(RenderTarget::AttachmentPoint::COLOR, app.offscreenColorTexture)
-            .texture(RenderTarget::AttachmentPoint::DEPTH, app.offscreenDepthTexture)
-            .build(*engine);
-        app.offscreenView->setRenderTarget(app.offscreenRenderTarget);
-        app.offscreenView->setViewport({0, 0, vp.width, vp.height});
-        app.offscreenCamera = engine->createCamera(em.create());
-        app.offscreenView->setCamera(app.offscreenCamera);
-        FilamentApp::get().addOffscreenView(app.offscreenView);
+            app.viewer = new ViewerGui(engine, app.offscreenScene, app.offscreenView, 410);
+            app.viewer->setUiCallback([&app, scene, view, engine]() {
+                if (ImGui::CollapsingHeader("Debug")) {
+                    auto& debug = engine->getDebugRegistry();
+                    ImGui::Checkbox("Disable buffer padding",
+                            debug.getPropertyAddress<bool>("d.renderer.disable_buffer_padding"));
+                    ImGui::Checkbox("Disable sub-passes",
+                            debug.getPropertyAddress<bool>("d.renderer.disable_subpasses"));
+                }
+            });
+            Viewport vp = view->getViewport();
+            vp.width = vp.width - app.viewer->getSidebarWidth();

-        // Position and orient the mirror in an interesting way.
-        float3 c = app.quadCenter = {-2, 0, -5};
-        float3 n = app.quadNormal = normalize(float3 {1, 0, 2});
-        float3 u = normalize(cross(app.quadNormal, float3(0, 1, 0)));
-        float3 v = cross(n, u);
-        u = 1.5 * u;
-        v = 1.5 * v;
-        static Vertex kQuadVertices[4] = { {{}, {1, 0}}, {{}, {0, 0}}, {{}, {1, 1}}, {{}, {0, 1}} };
-        kQuadVertices[0].position = c - u - v;
-        kQuadVertices[1].position = c + u - v;
-        kQuadVertices[2].position = c - u + v;
-        kQuadVertices[3].position = c + u + v;
+            app.offscreenColorTexture =
+                    Texture::Builder()
+                            .width(vp.width)
+                            .height(vp.height)
+                            .levels(1)
+                            .usage(Texture::Usage::COLOR_ATTACHMENT | Texture::Usage::SAMPLEABLE)
+                            .format(Texture::InternalFormat::RGBA8)
+                            .build(*engine);
+            app.offscreenDepthTexture = Texture::Builder()
+                                                .width(vp.width)
+                                                .height(vp.height)
+                                                .levels(1)
+                                                .usage(Texture::Usage::DEPTH_ATTACHMENT)
+                                                .format(Texture::InternalFormat::DEPTH32F)
+                                                .build(*engine);
+            app.offscreenRenderTarget = RenderTarget::Builder()
+                                                .texture(RenderTarget::AttachmentPoint::COLOR,
+                                                        app.offscreenColorTexture)
+                                                .texture(RenderTarget::AttachmentPoint::DEPTH,
+                                                        app.offscreenDepthTexture)
+                                                .build(*engine);
+            app.offscreenView->setRenderTarget(app.offscreenRenderTarget);
+            app.offscreenView->setViewport({0, 0, vp.width, vp.height});
+            app.offscreenCamera = engine->createCamera(em.create());
+            app.offscreenView->setCamera(app.offscreenCamera);
+            FilamentApp::get().addOffscreenView(app.offscreenView);
+        }

-        // Create quad vertex buffer.
-        static_assert(sizeof(Vertex) == 20, "Strange vertex size.");
-        app.quadVb = VertexBuffer::Builder()
-                .vertexCount(4)
-                .bufferCount(1)
-                .attribute(VertexAttribute::POSITION, 0, VertexBuffer::AttributeType::FLOAT3, 0, 20)
-                .attribute(VertexAttribute::UV0, 0, VertexBuffer::AttributeType::FLOAT2, 12, 20)
-                .build(*engine);
-        app.quadVb->setBufferAt(*engine, 0,
-                VertexBuffer::BufferDescriptor(kQuadVertices, 80, nullptr));
+        // damaged helmet gltf
+        {
+            app.names = new utils::NameComponentManager(em);
+            app.materials = createJitShaderProvider(engine, true);
+            app.assetLoader = AssetLoader::create({engine, app.materials, app.names});

-        // Create quad index buffer.
-        static constexpr uint16_t kQuadIndices[6] = { 0, 1, 2, 3, 2, 1 };
-        app.quadIb = IndexBuffer::Builder()
-                .indexCount(6)
-                .bufferType(IndexBuffer::IndexType::USHORT)
-                .build(*engine);
-        app.quadIb->setBuffer(*engine, IndexBuffer::BufferDescriptor(kQuadIndices, 12, nullptr));
+            app.asset = app.assetLoader->createAsset(GLTF_DEMO_DAMAGEDHELMET_DATA,
+                    GLTF_DEMO_DAMAGEDHELMET_SIZE);

-        // Create quad material and renderable.
-        app.quadMaterial = Material::Builder()
-                .package(RESOURCES_MIRROR_DATA, RESOURCES_MIRROR_SIZE)
-                .build(*engine);
-        app.quadMatInstance = app.quadMaterial->createInstance();
-        TextureSampler sampler(TextureSampler::MinFilter::LINEAR, TextureSampler::MagFilter::LINEAR);
-        app.quadMatInstance->setParameter("albedo", app.offscreenColorTexture, sampler);
-        app.quadEntity = em.create();
-        RenderableManager::Builder(1)
-                .boundingBox({{ -1, -1, -1 }, { 1, 1, 1 }})
-                .material(0, app.quadMatInstance)
-                .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.quadVb, app.quadIb, 0, 6)
-                .culling(false)
-                .receiveShadows(false)
-                .castShadows(false)
-                .build(*engine, app.quadEntity);
-        scene->addEntity(app.quadEntity);
+            loadResources();

-        // Instantiate mesh material.
-        app.meshMaterial = Material::Builder()
-            .package(RESOURCES_AIDEFAULTMAT_DATA, RESOURCES_AIDEFAULTMAT_SIZE).build(*engine);
-        auto mi = app.meshMatInstance = app.meshMaterial->createInstance();
-        mi->setParameter("baseColor", RgbType::LINEAR, {0.8, 1.0, 1.0});
-        mi->setParameter("metallic", 0.0f);
-        mi->setParameter("roughness", 0.4f);
-        mi->setParameter("reflectance", 0.5f);
+            app.offscreenScene->addEntities(app.asset->getLightEntities(),
+                    app.asset->getLightEntityCount());
+            static constexpr int kNumAvailable = 128;
+            utils::Entity renderables[kNumAvailable];
+            gltfio::FilamentAsset::SceneMask mask;
+            mask.set(0);
+            while (size_t numWritten = app.asset->popRenderables(renderables, kNumAvailable)) {
+                app.asset->addEntitiesToScene(*app.offscreenScene, renderables, numWritten, mask);
+            }

-        // Add monkey into the scene.
-        app.monkeyMesh = MeshReader::loadMeshFromBuffer(engine, MONKEY_SUZANNE_DATA, nullptr, nullptr, mi);
-        auto ti = tcm.getInstance(app.monkeyMesh.renderable);
-        app.transform = mat4f{ mat3f(1), float3(0, 0, -4) } * tcm.getWorldTransform(ti);
-        rcm.setCastShadows(rcm.getInstance(app.monkeyMesh.renderable), false);
-        scene->addEntity(app.monkeyMesh.renderable);
+            app.rootTransformEntity = engine->getEntityManager().create();
+            tcm.create(app.rootTransformEntity);
+            TransformManager::Instance const& root = tcm.getInstance(app.rootTransformEntity);
+            tcm.setParent(tcm.getInstance(app.asset->getRoot()), root);
+            tcm.setTransform(root, mat4::translation(float3(0, 0, -4)));
+        }

-        // Create a reflected monkey, which is used only for App::ReflectionMode::RENDERABLES.
-        app.reflectedMonkey = em.create();
-        RenderableManager::Builder(1)
-                .boundingBox({{ -2, -2, -2 }, { 2, 2, 2 }})
-                .material(0, mi)
-                .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.monkeyMesh.vertexBuffer, app.monkeyMesh.indexBuffer)
-                .receiveShadows(true)
-                .castShadows(false)
-                .build(*engine, app.reflectedMonkey);
-        setReflectionMode(app, app.mode);
+        // full-screen quad
+        {
+            static Vertex kQuadVertices[4] = {{{1, 1, 0}, {1, 1}}, {{1, -1, 0}, {1, 0}},
+                {{-1, -1, 0}, {0, 0}}, {{-1, 1, 0}, {0, 1}}};
+            // Create quad vertex buffer.
+            static_assert(sizeof(Vertex) == 20, "Strange vertex size.");
+            app.quadVb = VertexBuffer::Builder()
+                                 .vertexCount(4)
+                                 .bufferCount(1)
+                                 .attribute(VertexAttribute::POSITION, 0,
+                                         VertexBuffer::AttributeType::FLOAT3, 0, 20)
+                                 .attribute(VertexAttribute::UV0, 0,
+                                         VertexBuffer::AttributeType::FLOAT2, 12, 20)
+                                 .build(*engine);
+            app.quadVb->setBufferAt(*engine, 0,
+                    VertexBuffer::BufferDescriptor(kQuadVertices, 80, nullptr));

-        // Add light source to both scenes.
-        // NOTE: this is slightly wrong when the reflection mode is RENDERABLES.
-        app.lightEntity = em.create();
-        LightManager::Builder(LightManager::Type::SUN)
-                .color(Color::toLinear<ACCURATE>(sRGBColor(0.98f, 0.92f, 0.89f)))
-                .intensity(110000)
-                .direction({ 0.7, -1, -0.8 })
-                .sunAngularRadius(1.9f)
-                .castShadows(false)
-                .build(*engine, app.lightEntity);
-        scene->addEntity(app.lightEntity);
-        app.offscreenScene->addEntity(app.lightEntity);
+            // Create quad index buffer.
+            static constexpr uint16_t kQuadIndices[6] = {0, 2, 1, 2, 0, 3};
+            app.quadIb = IndexBuffer::Builder()
+                                 .indexCount(6)
+                                 .bufferType(IndexBuffer::IndexType::USHORT)
+                                 .build(*engine);
+            app.quadIb->setBuffer(*engine,
+                    IndexBuffer::BufferDescriptor(kQuadIndices, 12, nullptr));
+
+            // Create quad material and renderable.
+            // NOTE: this material is VertexDomain=device
+            app.quadMaterial = Material::Builder()
+                                       .package(RESOURCES_MIRROR_DATA, RESOURCES_MIRROR_SIZE)
+                                       .build(*engine);
+            app.quadMatInstance = app.quadMaterial->createInstance();
+            TextureSampler sampler(TextureSampler::MinFilter::LINEAR,
+                    TextureSampler::MagFilter::LINEAR);
+            app.quadMatInstance->setParameter("albedo", app.offscreenColorTexture, sampler);
+            app.quadEntity = em.create();
+            RenderableManager::Builder(1)
+                    .boundingBox({{-1, -1, -1}, {1, 1, 1}})
+                    .material(0, app.quadMatInstance)
+                    .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.quadVb,
+                            app.quadIb, 0, 6)
+                    .culling(false)
+                    .receiveShadows(false)
+                    .castShadows(false)
+                    .build(*engine, app.quadEntity);
+            scene->addEntity(app.quadEntity);
+        }
    };

    auto cleanup = [&app](Engine* engine, View*, Scene*) {
@@ -318,14 +346,10 @@ int main(int argc, char** argv) {
        engine->destroyCameraComponent(camera);
        em.destroy(camera);

-        engine->destroy(app.reflectedMonkey);
        engine->destroy(app.lightEntity);
        engine->destroy(app.quadEntity);
        engine->destroy(app.meshMatInstance);
        engine->destroy(app.meshMaterial);
-        engine->destroy(app.monkeyMesh.renderable);
-        engine->destroy(app.monkeyMesh.vertexBuffer);
-        engine->destroy(app.monkeyMesh.indexBuffer);
        engine->destroy(app.offscreenColorTexture);
        engine->destroy(app.offscreenDepthTexture);
        engine->destroy(app.offscreenRenderTarget);
@@ -337,43 +361,22 @@ int main(int argc, char** argv) {
        engine->destroy(app.quadMaterial);
    };

-    auto preRender = [&app](Engine*, View*, Scene*, Renderer* renderer) {
+    auto preRender = [&app](Engine* engine, View* view, Scene*, Renderer* renderer) {
        renderer->setClearOptions({.clearColor = {0.1,0.2,0.4,1.0}, .clear = true});
-    };

-    FilamentApp::get().animate([&app](Engine* engine, View* view, double now) {
-        auto& tcm = engine->getTransformManager();
+        utils::slog.e <<"offscreen view=" << app.offscreenView << " primary view=" <<
+                view << utils::io::endl;

-        // Animate the monkey by spinning and sliding back and forth along Z.
-        auto ti = tcm.getInstance(app.monkeyMesh.renderable);
-        mat4f xlate = mat4f::translation(float3(0, 0, 0.5 + sin(now)));
-        mat4f xform =  app.transform * xlate * mat4f::rotation(now, float3{ 0, 1, 0 });
-        tcm.setTransform(ti, xform);
-
-        // Generate a reflection matrix from the plane equation Ax + By + Cz + D = 0.
-        const float3 planeNormal = app.quadNormal;
-        const float4 planeEquation(planeNormal, -dot(planeNormal, app.quadCenter));
-        const mat4f reflection = reflectionMatrix(planeEquation);
-
-        // Apply the reflection matrix to either the renderable or the camera, depending on mode.
        Camera const& camera = view->getCamera();
-        const auto model = camera.getModelMatrix();
        const auto renderingProjection = camera.getProjectionMatrix();
        const auto cullingProjection = camera.getCullingProjectionMatrix();
        app.offscreenCamera->setCustomProjection(renderingProjection, cullingProjection,
                camera.getNear(), camera.getCullingFar());
-        switch (app.mode) {
-            case App::ReflectionMode::RENDERABLES:
-                tcm.setTransform(tcm.getInstance(app.reflectedMonkey), reflection * xform);
-                app.offscreenCamera->setModelMatrix(model);
-                break;
-            case App::ReflectionMode::CAMERA:
-                app.offscreenCamera->setModelMatrix(reflection * model);
-                break;
-        }
-    });
+        const auto model = camera.getModelMatrix();
+        app.offscreenCamera->setModelMatrix(model);
+    };

-    FilamentApp::get().run(app.config, setup, cleanup, FilamentApp::ImGuiCallback(), preRender);
+    FilamentApp::get().run(app.config, setup, cleanup, gui, preRender);

    return 0;
 }
@@ -615,51 +615,14 @@ static bool processVariables(MaterialBuilder& builder, const JsonishValue& value
    }

    for (size_t i = 0; i < elements.size(); i++) {
-        ParameterPrecision precision = ParameterPrecision::DEFAULT;
-        MaterialBuilder::Variable v = intToVariable(i);
-        std::string nameString;
-
        auto elementValue = elements[i];
-        if (elementValue->getType() == JsonishValue::Type::OBJECT) {
-
-            JsonishObject const& jsonObject = *elementValue->toJsonObject();
-
-            const JsonishValue* nameValue = jsonObject.getValue("name");
-            if (!nameValue) {
-                std::cerr << "variables: entry without 'name' key." << std::endl;
-                return false;
-            }
-            if (nameValue->getType() != JsonishValue::STRING) {
-                std::cerr << "variables: name value must be STRING." << std::endl;
-                return false;
-            }
-
-            const JsonishValue* precisionValue = jsonObject.getValue("precision");
-            if (precisionValue) {
-                if (precisionValue->getType() != JsonishValue::STRING) {
-                    std::cerr << "variables: precision must be a STRING." << std::endl;
-                    return false;
-                }
-                auto precisionString = precisionValue->toJsonString();
-                if (!Enums::isValid<ParameterPrecision>(precisionString->getString())){
-                    return logEnumIssue("variables", *precisionString, Enums::map<ParameterPrecision>());
-                }
-            }
-
-            nameString = nameValue->toJsonString()->getString();
-            if (precisionValue) {
-                precision = Enums::toEnum<ParameterPrecision>(
-                        precisionValue->toJsonString()->getString());
-            }
-            builder.variable(v, nameString.c_str(), precision);
-        } else if (elementValue->getType() == JsonishValue::Type::STRING) {
-            nameString = elementValue->toJsonString()->getString();
-            builder.variable(v, nameString.c_str());
-        } else {
+        MaterialBuilder::Variable v = intToVariable(i);
+        if (elementValue->getType() != JsonishValue::Type::STRING) {
            std::cerr << "variables: array index " << i << " is not a STRING. found:" <<
                    JsonishValue::typeToString(elementValue->getType()) << std::endl;
            return false;
        }
+        builder.variable(v, elementValue->toJsonString()->getString().c_str());
    }

    return true;