vk: fixing renderstandalone

filament/backend/src/vulkan/VulkanConstants.h

@@ -165,14 +165,14 @@ constexpr static const int FVK_REQUIRED_VERSION_MINOR = 1;
 // buffers that have been submitted but have not yet finished rendering. Note that Filament can
 // issue multiple commit calls in a single frame, and that we use a triple buffered swap chain on
 // some platforms.
-constexpr static const int FVK_MAX_COMMAND_BUFFERS = 10;
+constexpr static const int FVK_MAX_COMMAND_BUFFERS = 3;
 
 // Number of command buffer submissions that should occur before an unused pipeline is removed
 // from the cache.
 //
 // If this number is low, VkPipeline construction will occur frequently, which can
 // be extremely slow. If this number is high, the memory footprint will be large.
-constexpr static const int FVK_MAX_PIPELINE_AGE = 10;
+constexpr static const int FVK_MAX_PIPELINE_AGE = 3;
 
 // VulkanPipelineCache does not track which command buffers contain references to which pipelines,
 // instead it simply waits for at least FVK_MAX_COMMAND_BUFFERS submissions to occur before

filament/backend/src/vulkan/VulkanDriver.cpp

@@ -530,6 +530,8 @@ void VulkanDriver::createTextureR(Handle<HwTexture> th, SamplerType target, uint
     auto vktexture = mResourceAllocator.construct<VulkanTexture>(th, mPlatform->getDevice(),
             mPlatform->getPhysicalDevice(), mContext, mAllocator, &mCommands, target, levels,
             format, samples, w, h, depth, usage, mStagePool);
+//    FVK_LOGE <<"created texture: " << vktexture->getVkImage() << " dim=" <<
+//            vktexture->width << "x" << vktexture->height << utils::io::endl;
     mResourceManager.acquire(vktexture);
 }
 

filament/src/details/RenderTarget.cpp

@@ -34,7 +34,7 @@ struct RenderTarget::BuilderDetails {
     uint32_t mWidth{};
     uint32_t mHeight{};
     uint8_t mSamples = 1;   // currently not settable in the public facing API
-    uint8_t mLayerCount = 0;// currently not settable in the public facing API
+    uint8_t mLayerCount = 1;// currently not settable in the public facing API
 };
 
 using BuilderType = RenderTarget;

samples/CMakeLists.txt

@@ -39,6 +39,7 @@ set(MATERIAL_SRCS
         materials/sandboxSubsurface.mat
         materials/sandboxUnlit.mat
         materials/texturedLit.mat
+        materials/iconTest.mat
 )
 
 if (CMAKE_CROSSCOMPILING)
@@ -270,6 +271,7 @@ if (NOT ANDROID)
     add_demo(viewtest)
 
     # Sample app specific
+    target_link_libraries(hellotriangle PRIVATE gltf-demo-resources uberarchive gltfio)
     target_link_libraries(frame_generator PRIVATE imageio)
     target_link_libraries(gltf_viewer PRIVATE gltf-demo-resources uberarchive gltfio viewer)
     target_link_libraries(gltf_instances PRIVATE gltf-demo-resources uberarchive gltfio viewer)

samples/hellotriangle.cpp

@@ -1,192 +1,490 @@
-/*
- * Copyright (C) 2018 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 <fstream>
+#include <iostream>
 
 #include <filament/Camera.h>
 #include <filament/Engine.h>
 #include <filament/IndexBuffer.h>
-#include <filament/Material.h>
-#include <filament/MaterialInstance.h>
+#include <filament/LightManager.h>
 #include <filament/RenderableManager.h>
+#include <filament/Renderer.h>
 #include <filament/Scene.h>
 #include <filament/Skybox.h>
-#include <filament/TransformManager.h>
-#include <filament/VertexBuffer.h>
 #include <filament/View.h>
+#include <filament/Viewport.h>
+#include <filament/SwapChain.h>
+#include <filament/Texture.h>
+#include <filament/TransformManager.h>
+#include <filament/RenderTarget.h>
+
+#include <filamat/MaterialBuilder.h>
 
 #include <utils/EntityManager.h>
+#include <utils/Log.h>
 
-#include <filamentapp/Config.h>
-#include <filamentapp/FilamentApp.h>
+#include <math/norm.h>
 
-#include <getopt/getopt.h>
+#include <gltfio/AssetLoader.h>
+#include <gltfio/ResourceLoader.h>
 
-#include <cmath>
-#include <iostream>
+#include <SDL.h>
+#include <SDL_syswm.h>
+#include <SDL_video.h>
 
+#include <filamentapp/NativeWindowHelper.h>
 
 #include "generated/resources/resources.h"
+#include "materials/uberarchive.h"
+
+#include <vector>
 
 using namespace filament;
-using utils::Entity;
-using utils::EntityManager;
+using namespace math;
+using namespace utils;
 
-struct App {
-    Config config;
-    VertexBuffer* vb;
-    IndexBuffer* ib;
-    Material* mat;
-    Camera* cam;
-    Entity camera;
-    Skybox* skybox;
-    Entity renderable;
+namespace {
+
+const static uint32_t gIndices[] = {0, 1, 2, 2, 3, 0};
+
+float const QUAD_WIDTH = .5;
+
+const static math::float3 gVertices[] = {
+    float3 {0, 0, 0} * QUAD_WIDTH,
+    float3 {0, 1, 0} * QUAD_WIDTH,
+    float3 {1, 1, 0} * QUAD_WIDTH,
+    float3 {1, 0, 0} * QUAD_WIDTH,
 };
 
-struct Vertex {
-    filament::math::float2 position;
-    uint32_t color;
+const static math::float2 gUVs[] = {
+    {0, 0},
+    {0, 1},
+    {1, 1},
+    {1, 0},
 };
 
-static const Vertex TRIANGLE_VERTICES[3] = {
-    {{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},
-};
+const static short4 tbn = math::packSnorm16(mat3f::packTangentFrame(
+        math::mat3f{float3{1.0f, 0.0f, 0.0f}, float3{0.0f, 0.0f, 1.0f},
+            float3{0.0f, 1.0f, 0.0f}}).xyzw);
 
-static constexpr uint16_t TRIANGLE_INDICES[3] = { 0, 1, 2 };
+const static math::short4 gNormals[]{tbn, tbn, tbn, tbn};
 
-static void printUsage(char* name) {
-    std::string exec_name(utils::Path(name).getName());
-    std::string usage(
-            "HELLOTRIANGLE renders a spinning colored triangle\n"
-            "Usage:\n"
-            "    HELLOTRIANGLE [options]\n"
-            "Options:\n"
-            "   --help, -h\n"
-            "       Prints this message\n\n"
-            "   --api, -a\n"
-            "       Specify the backend API: opengl, vulkan, or metal\n"
-    );
-    const std::string from("HELLOTRIANGLE");
-    for (size_t pos = usage.find(from); pos != std::string::npos; pos = usage.find(from, pos)) {
-        usage.replace(pos, from.length(), exec_name);
+struct TestPrimitive {
+    TestPrimitive(Engine* engine) {
+        vertexBuffer =
+                VertexBuffer::Builder()
+                        .vertexCount(4)
+                        .bufferCount(3)
+                        .attribute(VertexAttribute::POSITION, 0,
+                                VertexBuffer::AttributeType::FLOAT3)
+                        .attribute(VertexAttribute::UV0, 1, VertexBuffer::AttributeType::FLOAT2)
+                        .attribute(VertexAttribute::TANGENTS, 2, VertexBuffer::AttributeType::FLOAT4)
+                        .build(*engine);
+        vertexBuffer->setBufferAt(*engine, 0,
+                VertexBuffer::BufferDescriptor(gVertices,
+                        vertexBuffer->getVertexCount() * sizeof(gVertices[0])));
+        vertexBuffer->setBufferAt(*engine, 1,
+                VertexBuffer::BufferDescriptor(gUVs,
+                        vertexBuffer->getVertexCount() * sizeof(gUVs[0])));
+        vertexBuffer->setBufferAt(*engine, 2,
+                VertexBuffer::BufferDescriptor(gNormals,
+                        vertexBuffer->getVertexCount() * sizeof(gNormals[0])));
+
+        indexBuffer = IndexBuffer::Builder().indexCount(6).build(*engine);
+
+        indexBuffer->setBuffer(*engine, IndexBuffer::BufferDescriptor(gIndices,
+                                                indexBuffer->getIndexCount() * sizeof(uint32_t)));
     }
-    std::cout << usage;
+
+    VertexBuffer* verts() const { return vertexBuffer; }
+    IndexBuffer* inds() const { return indexBuffer; }
+
+private:
+    VertexBuffer* vertexBuffer;
+    IndexBuffer* indexBuffer;
+};
+
+struct TestMaterial {
+    TestMaterial(Engine* engine) {
+        material = Material::Builder()
+                .package(RESOURCES_ICONTEST_DATA, RESOURCES_ICONTEST_SIZE)
+                .build(*engine);
+    }
+
+    MaterialInstance* instance() {
+        auto inst = material->createInstance();
+        instances.push_back(inst);
+        return inst;
+    }
+
+private:
+    Material* material;
+    std::vector<MaterialInstance*> instances;
+};
+
+struct TestTexture {
+    TestTexture(Engine* engine, size_t width, size_t height, bool attachment=false) {
+        auto usage = Texture::Usage::DEFAULT;
+        if (attachment) {
+            usage = usage | Texture::Usage::COLOR_ATTACHMENT;
+        }
+        texture = Texture::Builder()
+            .width(width).height(height).levels(1)
+            .usage(usage)
+            .format(Texture::InternalFormat::RGBA8).build(*engine);
+        uint8_t* data = (uint8_t*) malloc(width * height * 4);
+        std::memset(data, 0xFF, width * height * 4);
+        Texture::PixelBufferDescriptor buffer(data, size_t(width * height * 4),
+                                              Texture::Format::RGBA, Texture::Type::UBYTE,
+                                              [](void* buf, size_t size, void* user) {
+                                                  free(buf);
+                                              });
+        texture->setImage(*engine, 0, 0, 0, 0, width, height, 1, std::move(buffer));
+    }
+    Texture* get() const  { return texture; }
+private:
+    Texture* texture;
+};
+
+std::pair<SDL_Window*, void*> createSDLwindow() {
+    const uint32_t windowFlags = SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI;
+    SDL_Window* win = SDL_CreateWindow("Hello World!", 0, 100, 800, 800, windowFlags);
+    if (win == nullptr) {
+        std::cout << "SDL_CreateWindow Error: " << SDL_GetError() << std::endl;
+        SDL_Quit();
+        return {NULL, NULL};
+    }
+
+    void* nativeWindow = getNativeWindow(win);
+#if defined(__APPLE__)
+    prepareNativeWindow(win);
+    setUpMetalLayer(nativeWindow);
+#endif
+
+    return {win, nativeWindow};
 }
 
-static int handleCommandLineArguments(int argc, char* argv[], App* app) {
-    static constexpr const char* OPTSTR = "ha:";
-    static const struct option OPTIONS[] = {
-            { "help", no_argument,       nullptr, 'h' },
-            { "api",  required_argument, nullptr, 'a' },
-            { nullptr, 0,                nullptr, 0 }
+struct IconScene {
+
+    struct Option {
+        float border=1.4;
+        bool postProcessing=true;
+        bool useSkybox=false;
     };
-    int opt;
-    int option_index = 0;
-    while ((opt = getopt_long(argc, argv, OPTSTR, OPTIONS, &option_index)) >= 0) {
-        std::string arg(optarg ? optarg : "");
-        switch (opt) {
-            default:
-            case 'h':
-                printUsage(argv[0]);
-                exit(0);
-            case 'a':
-                if (arg == "opengl") {
-                    app->config.backend = Engine::Backend::OPENGL;
-                } else if (arg == "vulkan") {
-                    app->config.backend = Engine::Backend::VULKAN;
-                } else if (arg == "metal") {
-                    app->config.backend = Engine::Backend::METAL;
-                } else {
-                    std::cerr << "Unrecognized backend. Must be 'opengl'|'vulkan'|'metal'.\n";
-                    exit(1);
-                }
-                break;
+
+    IconScene(Engine* engine, Renderer* renderer, uint32_t w, uint32_t h, Option option)
+        : engine(engine),
+          renderer(renderer),
+          material(engine),
+          primitives(engine) {
+        cameraEntity = EntityManager::get().create();
+        camera = engine->createCamera(cameraEntity);
+        camera->lookAt(float3(0, 0, -10.f), float3(0, 0, 0), float3(0, 1.0f, 0));
+        float halfWidth = (QUAD_WIDTH / 2) * option.border;
+        camera->setProjection(Camera::Projection::ORTHO,
+                -halfWidth , halfWidth, -halfWidth, halfWidth, -50, 50);
+
+        scene = engine->createScene();
+
+        view = engine->createView();
+        view->setViewport({0, 0, w, h});
+        view->setScene(scene);
+        view->setCamera(camera);
+        view->setPostProcessingEnabled(false);
+
+        Entity renderable = EntityManager::get().create();
+        matInstance = material.instance();
+        RenderableManager::Builder(1)
+                .boundingBox({{-10, -10, -10}, {10, 10, 10}})
+                .material(0, matInstance)
+                .geometry(0, RenderableManager::PrimitiveType::TRIANGLES,
+                        primitives.verts(), primitives.inds(), 0, 6)
+                .culling(false)
+                .build(*engine, renderable);
+
+        scene->addEntity(renderable);
+
+        auto& tcm = engine->getTransformManager();
+        tcm.create(renderable);
+        auto inst = tcm.getInstance(renderable);
+        mat4f xlate = mat4f::translation(float3(QUAD_WIDTH / -2.0, QUAD_WIDTH / -2.0, 0));
+        tcm.setTransform(inst, xlate);
+    }
+
+    void render(Texture* texture, Texture* renderTargetTexture, float3 const& multiplier) {
+        TextureSampler sampler{TextureSampler::MinFilter::NEAREST,
+                TextureSampler::MagFilter::NEAREST};
+
+        matInstance->setParameter("tex", texture, sampler);
+        matInstance->setParameter("multiplier", multiplier);
+
+        RenderTarget* target;
+        if (auto itr = targets.find(renderTargetTexture); itr != targets.end()) {
+            target = itr->second;
+        } else {
+            target = RenderTarget::Builder()
+                    .texture(RenderTarget::AttachmentPoint::COLOR, renderTargetTexture)
+                    .build(*engine);
+            targets[renderTargetTexture] = target;
+        }
+
+        view->setRenderTarget(target);
+        renderer->renderStandaloneView(view);
+    }
+
+    void renderToSwapChain(SwapChain* swapChain, Texture* texture) {
+        TextureSampler sampler{TextureSampler::MinFilter::NEAREST,
+                TextureSampler::MagFilter::NEAREST};
+        matInstance->setParameter("tex", texture, sampler);
+        matInstance->setParameter("multiplier", float3 {1});
+
+        if (renderer->beginFrame(swapChain)) {
+            // for each View
+            renderer->render(view);
+            renderer->endFrame();
         }
     }
-    return optind;
+
+
+private:
+    Engine* engine;
+    Renderer* renderer;
+    View* view;
+    Scene* scene;
+    Camera* camera;
+    TestMaterial material;
+    TestPrimitive primitives;
+    Entity cameraEntity;
+    Skybox* skybox;
+    MaterialInstance* matInstance;
+    std::unordered_map<Texture*, RenderTarget*> targets;
+};
+
+struct MainScene {
+    using TextureMatrix = std::vector<std::vector<Texture*>>;
+
+    MainScene(Engine* engine, Renderer* renderer, uint32_t w, uint32_t h, uint32_t nrows,
+            uint32_t ncols)
+        : renderer(renderer),
+          primitives{engine},
+          material(engine),
+          engine(engine) {
+        cameraEntity = EntityManager::get().create();
+
+        camera = engine->createCamera(cameraEntity);
+        camera->lookAt(float3(0, 0, -10.f), float3(0, 0, 0), float3(0, 1.0f, 0));
+        camera->setProjection(45.0, double(w) / h, 0.1, 50, Camera::Fov::VERTICAL);
+
+        scene = engine->createScene();
+
+//        skybox = Skybox::Builder().color({0.2, 0.2, 0.2, 1.0}).build(*engine);
+//        scene->setSkybox(skybox);
+
+        view = engine->createView();
+        view->setViewport({0, 0, w, h});
+        view->setScene(scene);
+        view->setCamera(camera);
+        view->setPostProcessingEnabled(false);
+
+        root = EntityManager::get().create();
+        auto& tcm = engine->getTransformManager();
+        tcm.create(root);
+        auto rootInst = tcm.getInstance(root);
+        mat4f xlate = mat4f::translation(float3(-QUAD_WIDTH / 2 * nrows , -QUAD_WIDTH / 2 * ncols, 0));
+        tcm.setTransform(rootInst, xlate);
+
+        matInst = material.instance();
+
+        renderable = EntityManager::get().create();
+        scene->addEntity(renderable);
+        RenderableManager::Builder(1)
+                .boundingBox({{-10, -10, -10}, {10, 10, 10}})
+                .material(0, matInst)
+                .geometry(0, RenderableManager::PrimitiveType::TRIANGLES,
+                        primitives.verts(), primitives.inds(), 0, 6)
+                .culling(false)
+                .build(*engine, renderable);
+
+        auto transformInst = tcm.getInstance(renderable);
+        tcm.setParent(transformInst, rootInst);
+    }
+
+    void render(Texture* texture, RenderTarget* target, uint32_t r, uint32_t c) {
+        auto& tcm = engine->getTransformManager();
+        TextureSampler sampler{TextureSampler::MinFilter::NEAREST,
+                TextureSampler::MagFilter::NEAREST};
+        matInst->setParameter("tex", texture, sampler);
+        matInst->setParameter("multiplier", float3 {1});
+
+        auto transformInst = tcm.getInstance(renderable);
+        mat4f xlate = mat4f::translation(float3(QUAD_WIDTH * r, QUAD_WIDTH * c, 0));
+        tcm.setTransform(transformInst, xlate);
+
+        view->setRenderTarget(target);
+        renderer->renderStandaloneView(view);
+    }
+
+    void renderToSwapChain(SwapChain* swapChain, Texture* texture, uint32_t r, uint32_t c){
+        auto& tcm = engine->getTransformManager();
+        TextureSampler sampler{TextureSampler::MinFilter::NEAREST,
+                TextureSampler::MagFilter::NEAREST};
+        matInst->setParameter("tex", texture, sampler);
+        matInst->setParameter("multiplier", float3 {1});
+
+        auto transformInst = tcm.getInstance(renderable);
+        mat4f xlate = mat4f::translation(float3(QUAD_WIDTH * r, QUAD_WIDTH * c, 0));
+        tcm.setTransform(transformInst, xlate);
+
+        if (renderer->beginFrame(swapChain)) {
+            // for each View
+            renderer->render(view);
+            renderer->endFrame();
+        }
+    }
+
+
+    Scene* get() const { return scene; }
+    Camera* getCamera() const { return camera; }
+    View* getView() const { return view; }
+
+private:
+    Renderer* renderer;
+    TestMaterial material;
+    MaterialInstance* matInst;
+    TestPrimitive primitives;
+    TextureMatrix textures;
+    Scene* scene;
+    Entity light;
+    Entity root;
+    Entity renderable;
+    Camera* camera;
+    Entity cameraEntity;
+    Skybox* skybox;
+    View* view;
+    std::vector<Entity> renderables;
+    Engine* engine;
+};
+
 }
 
-int main(int argc, char** argv) {
-    App app{};
-    app.config.title = "hellotriangle";
-    app.config.featureLevel = backend::FeatureLevel::FEATURE_LEVEL_0;
-    handleCommandLineArguments(argc, argv, &app);
+int main() {
+    SDL_Init(SDL_INIT_EVERYTHING);
+    auto const [window, nativeWindow] = createSDLwindow();
 
-    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);
-        static_assert(sizeof(Vertex) == 12, "Strange vertex size.");
-        app.vb = VertexBuffer::Builder()
-                .vertexCount(3)
-                .bufferCount(1)
-                .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, 36, nullptr));
-        app.ib = IndexBuffer::Builder()
-                .indexCount(3)
-                .bufferType(IndexBuffer::IndexType::USHORT)
-                .build(*engine);
-        app.ib->setBuffer(*engine,
-                IndexBuffer::BufferDescriptor(TRIANGLE_INDICES, 6, nullptr));
-        app.mat = Material::Builder()
-                .package(RESOURCES_BAKEDCOLOR_DATA, RESOURCES_BAKEDCOLOR_SIZE)
-                .build(*engine);
-        app.renderable = EntityManager::get().create();
-        RenderableManager::Builder(1)
-                .boundingBox({{ -1, -1, -1 }, { 1, 1, 1 }})
-                .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);
-        scene->addEntity(app.renderable);
-        app.camera = utils::EntityManager::get().create();
-        app.cam = engine->createCamera(app.camera);
-        view->setCamera(app.cam);
+    Engine* engine = Engine::create(filament::backend::Backend::VULKAN);
+    SwapChain* swapChain =
+            engine->createSwapChain(nativeWindow, filament::SwapChain::CONFIG_HAS_STENCIL_BUFFER);
+    Renderer* renderer = engine->createRenderer();
+
+    // Determine the current size of the window in physical pixels.
+    uint32_t w, h;
+    SDL_GL_GetDrawableSize(window, (int*) &w, (int*) &h);
+
+    filamat::MaterialBuilder::init();
+
+    TestTexture matTexture {engine, 27, 27};
+
+    size_t const nrow = 10, ncol = 10;
+
+    uint32_t const iconWidth = 50;
+    uint32_t const iconHeight = 50;
+
+    IconScene iconScene {engine, renderer, iconWidth, iconHeight, {.useSkybox=false} };
+
+    auto buildTargets = [nrow, ncol, engine]() {
+        std::vector<std::vector<Texture*>> targets;
+        for (size_t r = 0; r < nrow; r++) {
+            std::vector<Texture*> row;
+            for (size_t c = 0; c < ncol; c++) {
+                TestTexture ttex {engine, iconWidth, iconHeight, true };
+                row.push_back(ttex.get());
+            }
+            targets.push_back(row);
+        }
+        return targets;
     };
 
-    auto cleanup = [&app](Engine* engine, View*, Scene*) {
-        engine->destroy(app.skybox);
-        engine->destroy(app.renderable);
-        engine->destroy(app.mat);
-        engine->destroy(app.vb);
-        engine->destroy(app.ib);
-        engine->destroyCameraComponent(app.camera);
-        utils::EntityManager::get().destroy(app.camera);
-    };
+    std::vector<std::vector<Texture*>> targets0 = buildTargets();
+    std::vector<std::vector<Texture*>> targets1 = buildTargets();
+    std::vector<std::vector<Texture*>> targets2 = buildTargets();
 
-    FilamentApp::get().animate([&app](Engine* engine, View* view, double now) {
-        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, 0, 1);
-        auto& tcm = engine->getTransformManager();
-        tcm.setTransform(tcm.getInstance(app.renderable),
-                filament::math::mat4f::rotation(now, filament::math::float3{ 0, 0, 1 }));
-    });
+    MainScene scene(engine, renderer, w, h, nrow, ncol);
 
-    FilamentApp::get().run(app.config, setup, cleanup);
+    renderer->setClearOptions({.clear = false});
+    float3 const a {.7, .3, .3};
+    float3 const b {.3, .7, .3};
+    std::vector<std::pair<size_t, size_t>> coords;
+    for (size_t r = 0; r < nrow; r++) {
+        for (size_t c = 0; c < ncol; c++) {
+            coords.push_back({r, c});
+        }
+    }
 
+    IconScene swapChainScene{engine, renderer, w, h, {
+            .border = 1.0f, .postProcessing = false}};
+
+    TestTexture mainTex{engine, w, h, true};
+    auto mainRT = RenderTarget::Builder()
+            .texture(RenderTarget::AttachmentPoint::COLOR, mainTex.get())
+            .build(*engine);
+
+    bool closeWindow = false;
+    size_t count = 0;
+    while (!closeWindow && ++count) {
+        constexpr int kMaxEvents = 16;
+        SDL_Event events[kMaxEvents];
+        int nevents = 0;
+        while (nevents < kMaxEvents && SDL_PollEvent(&events[nevents]) != 0) {
+            nevents++;
+        }
+
+        // Now, loop over the events a second time for app-side processing.
+        for (int i = 0; i < nevents; i++) {
+            const SDL_Event& event = events[i];
+            switch (event.type) {
+                case SDL_QUIT:
+                    closeWindow = true;
+                    break;
+                case SDL_WINDOWEVENT:
+                    switch (event.window.event) {
+                        case SDL_WINDOWEVENT_RESIZED:
+                            break;
+                        default:
+                            break;
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+        auto [r, c] = coords[count % coords.size()];
+        float3 color0 = (r + c) % 2 == 0 ? a : b;
+        float3 color1 = (r + c) % 2 == 0 ? b : a;
+        auto rt0 = targets0[r][c];
+        auto rt1 = targets1[r][c];
+        auto rt2 = targets2[r][c];
+        iconScene.render(matTexture.get(), rt0, color0);
+        iconScene.render(rt0, rt1, color1);
+        iconScene.render(rt1, rt2, float3 {.8});
+//        engine->flushAndWait();
+        scene.render(rt2, mainRT, r, c);
+//        engine->flushAndWait();
+//        engine->flush();
+//        scene.renderToSwapChain(swapChain, rt1, r, c);
+
+
+        if (count % 27 == 0) {
+            swapChainScene.renderToSwapChain(swapChain, mainTex.get());
+        }
+        SDL_Delay(16);
+
+        // if (renderer->beginFrame(swapChain)) {
+        //     // for each View
+        //     renderer->render(scene.getView());
+        //     renderer->endFrame();
+        // }
+
+
+//        SDL_Delay(16);
+
+    }
     return 0;
 }

samples/materials/iconTest.mat

@@ -0,0 +1,26 @@
+material {
+    name : Icon,
+    shadingModel : unlit,
+    requires : [
+        uv0
+    ],
+    parameters : [
+        {
+            type : sampler2d,
+            name : tex
+        },
+        {
+            type : float3,
+            name : multiplier
+        }
+    ],
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        prepareMaterial(material); 
+        vec3 m = materialParams.multiplier;
+        vec3 rgb = texture(materialParams_tex, getUV0()).rgb * m;
+        material.baseColor = vec4(rgb, 1.0);
+    }
+}