diff --git a/filament/CMakeLists.txt b/filament/CMakeLists.txt
index 60cafb04a0..01b4f46fea 100644
--- a/filament/CMakeLists.txt
+++ b/filament/CMakeLists.txt
@@ -47,6 +47,7 @@ set(SRCS
         src/fg/Blackboard.cpp
         src/fg/FrameGraph.cpp
         src/fg/FrameGraphHandle.cpp
+        src/fg/FrameGraphPassResources.cpp
         src/fg/fg/RenderTarget.cpp
         src/fg/fg/RenderTargetResource.cpp
         src/fg/fg/ResourceEntry.cpp
diff --git a/filament/src/fg/FrameGraph.cpp b/filament/src/fg/FrameGraph.cpp
index b66bccdc0e..7be2091439 100644
--- a/filament/src/fg/FrameGraph.cpp
+++ b/filament/src/fg/FrameGraph.cpp
@@ -117,86 +117,6 @@ FrameGraph::Builder& FrameGraph::Builder::sideEffect() noexcept {
 
 // ------------------------------------------------------------------------------------------------
 
-FrameGraphPassResources::FrameGraphPassResources(FrameGraph& fg, fg::PassNode const& pass) noexcept
-        : mFrameGraph(fg), mPass(pass) {
-}
-
-const char* FrameGraphPassResources::getPassName() const noexcept {
-    return mPass.name;
-}
-
-fg::ResourceEntryBase const& FrameGraphPassResources::getResourceEntryBase(FrameGraphHandle r) const noexcept {
-    ResourceNode& node = mFrameGraph.getResourceNodeUnchecked(r);
-
-    fg::ResourceEntryBase const* const pResource = node.resource;
-    assert(pResource);
-
-// TODO: we should check for write to
-//    // check that this FrameGraphHandle is indeed used by this pass
-//    ASSERT_POSTCONDITION_NON_FATAL(mPass.isReadingFrom(r),
-//            "Pass \"%s\" doesn't declare reads to resource \"%s\" -- expect graphic corruptions",
-//            mPass.name, pResource->name);
-
-    return *pResource;
-}
-
-FrameGraphPassResources::RenderTargetInfo
-FrameGraphPassResources::getRenderTarget(FrameGraphRenderTargetHandle handle, uint8_t level) const noexcept {
-    FrameGraphPassResources::RenderTargetInfo info{};
-    FrameGraph& fg = mFrameGraph;
-
-    fg::RenderTarget& renderTarget = fg.mRenderTargets[handle];
-    assert(renderTarget.cache);
-
-    info = renderTarget.cache->targetInfo;
-    assert(info.target);
-
-    // overwrite discard flags with the per-rendertarget (per-pass) computed value
-    info.params.flags.discardStart = TargetBufferFlags::NONE;
-    info.params.flags.discardEnd   = TargetBufferFlags::NONE;
-    info.params.flags.clear        = renderTarget.userClearFlags;
-
-    static constexpr TargetBufferFlags flags[] = {
-            TargetBufferFlags::COLOR,
-            TargetBufferFlags::DEPTH,
-            TargetBufferFlags::STENCIL };
-
-    auto& resourceNodes = fg.mResourceNodes;
-    for (size_t i = 0; i <renderTarget.desc.attachments.textures.size(); i++) {
-        FrameGraphHandle attachment = renderTarget.desc.attachments.textures[i];
-        if (attachment.isValid()) {
-            if (resourceNodes[attachment.index].resource->discardStart) {
-                info.params.flags.discardStart |= flags[i];
-            }
-            if (resourceNodes[attachment.index].resource->discardEnd) {
-                info.params.flags.discardEnd |= flags[i];
-            }
-        }
-    }
-
-    // clear implies discarding the content of the buffer
-    info.params.flags.discardStart |= (renderTarget.userClearFlags & TargetBufferFlags::ALL);
-    if (renderTarget.cache->imported) {
-        // we never discard more than the user flags
-        info.params.flags.discardStart &= renderTarget.cache->discardStart;
-        info.params.flags.discardEnd   &= renderTarget.cache->discardEnd;
-    }
-
-    // check that this FrameGraphRenderTarget is indeed declared by this pass
-    ASSERT_POSTCONDITION_NON_FATAL(info.target,
-            "Pass \"%s\" doesn't declare rendertarget \"%s\" -- expect graphic corruptions",
-            mPass.name, renderTarget.name);
-    
-//    slog.d << mPass.name << ": resource = \"" << renderTarget.name << "\", flags = "
-//        << io::hex
-//        << renderTarget.targetInfo.params.discardStart << ", "
-//        << renderTarget.targetInfo.params.discardEnd << io::endl;
-
-    return info;
-}
-
-// ------------------------------------------------------------------------------------------------
-
 FrameGraph::FrameGraph(fg::ResourceAllocatorInterface& resourceAllocator)
         : mResourceAllocator(resourceAllocator),
           mArena("FrameGraph Arena", 65536), // TODO: the Area will eventually come from outside
diff --git a/filament/src/fg/FrameGraphPassResources.cpp b/filament/src/fg/FrameGraphPassResources.cpp
new file mode 100644
index 0000000000..f55fbeeec1
--- /dev/null
+++ b/filament/src/fg/FrameGraphPassResources.cpp
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2020 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 "FrameGraphPassResources.h"
+
+#include "FrameGraph.h"
+#include "FrameGraphHandle.h"
+
+#include "fg/RenderTargetResource.h"
+#include "fg/ResourceNode.h"
+#include "fg/RenderTarget.h"
+#include "fg/PassNode.h"
+
+#include <utils/Panic.h>
+#include <utils/Log.h>
+
+using namespace utils;
+
+namespace filament {
+
+using namespace backend;
+using namespace fg;
+using namespace details;
+
+FrameGraphPassResources::FrameGraphPassResources(FrameGraph& fg, fg::PassNode const& pass) noexcept
+        : mFrameGraph(fg), mPass(pass) {
+}
+
+const char* FrameGraphPassResources::getPassName() const noexcept {
+    return mPass.name;
+}
+
+fg::ResourceEntryBase const& FrameGraphPassResources::getResourceEntryBase(FrameGraphHandle r) const noexcept {
+    ResourceNode& node = mFrameGraph.getResourceNodeUnchecked(r);
+
+    fg::ResourceEntryBase const* const pResource = node.resource;
+    assert(pResource);
+
+// TODO: we should check for write to
+//    // check that this FrameGraphHandle is indeed used by this pass
+//    ASSERT_POSTCONDITION_NON_FATAL(mPass.isReadingFrom(r),
+//            "Pass \"%s\" doesn't declare reads to resource \"%s\" -- expect graphic corruptions",
+//            mPass.name, pResource->name);
+
+    return *pResource;
+}
+
+FrameGraphPassResources::RenderTargetInfo
+FrameGraphPassResources::getRenderTarget(FrameGraphRenderTargetHandle handle, uint8_t level) const noexcept {
+    FrameGraphPassResources::RenderTargetInfo info{};
+    FrameGraph& fg = mFrameGraph;
+
+    fg::RenderTarget& renderTarget = fg.mRenderTargets[handle];
+    assert(renderTarget.cache);
+
+    info = renderTarget.cache->targetInfo;
+    assert(info.target);
+
+    // overwrite discard flags with the per-rendertarget (per-pass) computed value
+    info.params.flags.discardStart = TargetBufferFlags::NONE;
+    info.params.flags.discardEnd   = TargetBufferFlags::NONE;
+    info.params.flags.clear        = renderTarget.userClearFlags;
+
+    static constexpr TargetBufferFlags flags[] = {
+            TargetBufferFlags::COLOR,
+            TargetBufferFlags::DEPTH,
+            TargetBufferFlags::STENCIL };
+
+    auto& resourceNodes = fg.mResourceNodes;
+    for (size_t i = 0; i <renderTarget.desc.attachments.textures.size(); i++) {
+        FrameGraphHandle attachment = renderTarget.desc.attachments.textures[i];
+        if (attachment.isValid()) {
+            if (resourceNodes[attachment.index].resource->discardStart) {
+                info.params.flags.discardStart |= flags[i];
+            }
+            if (resourceNodes[attachment.index].resource->discardEnd) {
+                info.params.flags.discardEnd |= flags[i];
+            }
+        }
+    }
+
+    // clear implies discarding the content of the buffer
+    info.params.flags.discardStart |= (renderTarget.userClearFlags & TargetBufferFlags::ALL);
+    if (renderTarget.cache->imported) {
+        // we never discard more than the user flags
+        info.params.flags.discardStart &= renderTarget.cache->discardStart;
+        info.params.flags.discardEnd   &= renderTarget.cache->discardEnd;
+    }
+
+    // check that this FrameGraphRenderTarget is indeed declared by this pass
+    ASSERT_POSTCONDITION_NON_FATAL(info.target,
+            "Pass \"%s\" doesn't declare rendertarget \"%s\" -- expect graphic corruptions",
+            mPass.name, renderTarget.name);
+
+//    slog.d << mPass.name << ": resource = \"" << renderTarget.name << "\", flags = "
+//        << io::hex
+//        << renderTarget.targetInfo.params.discardStart << ", "
+//        << renderTarget.targetInfo.params.discardEnd << io::endl;
+
+    return info;
+}
+
+} // namespace filament