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[Impeller] Start of Dart GPU prototype (flutter#42228)
I've been slowly hacking on a prototype alongside a doc (public go link [imminent](flutter/website#8716)) for a while (the doc has been changing a lot as a result of prototyping) and I think it's time to start landing parts of this prototype/experiment in-tree. This initial PR just sets up the main context singleton on the UI thread. After this, I'll land the shader management stuff. I re-used the existing experimental 3D flag for this, since this is meant to replace what can be done with Impeller Scene anyway.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| // ignore_for_file: public_member_api_docs | ||
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| part of dart.ui; | ||
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| class GpuContextException implements Exception { | ||
| GpuContextException(this.message); | ||
| String message; | ||
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| @override | ||
| String toString() { | ||
| return 'GpuContextException: $message'; | ||
| } | ||
| } | ||
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| enum BlendOperation { add, subtract, reverseSubtract } | ||
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| enum BlendFactor { | ||
| zero, | ||
| one, | ||
| sourceColor, | ||
| oneMinusSourceColor, | ||
| sourceAlpha, | ||
| oneMinusSourceAlpha, | ||
| destinationColor, | ||
| oneMinusDestinationColor, | ||
| destinationAlpha, | ||
| oneMinusDestinationAlpha, | ||
| sourceAlphaSaturated, | ||
| blendColor, | ||
| oneMinusBlendColor, | ||
| blendAlpha, | ||
| oneMinusBlendAlpha, | ||
| } | ||
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| class BlendOptions { | ||
| const BlendOptions({ | ||
| this.colorOperation = BlendOperation.add, | ||
| this.sourceColorFactor = BlendFactor.one, | ||
| this.destinationColorFactor = BlendFactor.oneMinusSourceAlpha, | ||
| this.alphaOperation = BlendOperation.add, | ||
| this.sourceAlphaFactor = BlendFactor.one, | ||
| this.destinationAlphaFactor = BlendFactor.oneMinusSourceAlpha, | ||
| }); | ||
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| final BlendOperation colorOperation; | ||
| final BlendFactor sourceColorFactor; | ||
| final BlendFactor destinationColorFactor; | ||
| final BlendOperation alphaOperation; | ||
| final BlendFactor sourceAlphaFactor; | ||
| final BlendFactor destinationAlphaFactor; | ||
| } | ||
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| enum StencilOperation { | ||
| keep, | ||
| zero, | ||
| setToReferenceValue, | ||
| incrementClamp, | ||
| decrementClamp, | ||
| invert, | ||
| incrementWrap, | ||
| decrementWrap, | ||
| } | ||
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| enum CompareFunction { | ||
| never, | ||
| always, | ||
| less, | ||
| equal, | ||
| lessEqual, | ||
| greater, | ||
| notEqual, | ||
| greaterEqual, | ||
| } | ||
|
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| class StencilOptions { | ||
| const StencilOptions({ | ||
| this.operation = StencilOperation.incrementClamp, | ||
| this.compare = CompareFunction.always, | ||
| }); | ||
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| final StencilOperation operation; | ||
| final CompareFunction compare; | ||
| } | ||
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| enum ShaderType { | ||
| unknown, | ||
| voidType, | ||
| booleanType, | ||
| signedByteType, | ||
| unsignedByteType, | ||
| signedShortType, | ||
| unsignedShortType, | ||
| signedIntType, | ||
| unsignedIntType, | ||
| signedInt64Type, | ||
| unsignedInt64Type, | ||
| atomicCounterType, | ||
| halfFloatType, | ||
| floatType, | ||
| doubleType, | ||
| structType, | ||
| imageType, | ||
| sampledImageType, | ||
| samplerType, | ||
| } | ||
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| class VertexAttribute { | ||
| const VertexAttribute({ | ||
| this.name = '', | ||
| this.location = 0, | ||
| this.set = 0, | ||
| this.binding = 0, | ||
| this.type = ShaderType.floatType, | ||
| this.elements = 2, | ||
| }); | ||
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| final String name; | ||
| final int location; | ||
| final int set; | ||
| final int binding; | ||
| final ShaderType type; | ||
| final int elements; | ||
| } | ||
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| class UniformSlot { | ||
| const UniformSlot({ | ||
| this.name = '', | ||
| this.set = 0, | ||
| this.extRes0 = 0, | ||
| this.binding = 0, | ||
| }); | ||
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| final String name; | ||
| final int set; | ||
| final int extRes0; | ||
| final int binding; | ||
| } | ||
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| class GpuShader {} | ||
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| class RasterPipeline {} | ||
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| /// A handle to a graphics context. Used to create and manage GPU resources. | ||
| /// | ||
| /// To obtain the default graphics context, use [getGpuContext]. | ||
| class GpuContext extends NativeFieldWrapperClass1 { | ||
| /// Creates a new graphics context that corresponds to the default Impeller | ||
| /// context. | ||
| GpuContext._createDefault() { | ||
| final String error = _initializeDefault(); | ||
| if (error.isNotEmpty) { | ||
| throw GpuContextException(error); | ||
| } | ||
| } | ||
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| //registerShaderLibrary() async | ||
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| Future<RasterPipeline> createRasterPipeline({ | ||
| required GpuShader vertex, | ||
| required GpuShader fragment, | ||
| BlendOptions blendOptions = const BlendOptions(), | ||
| StencilOptions stencilOptions = const StencilOptions(), | ||
| List<VertexAttribute> vertexLayout = const <VertexAttribute>[], | ||
| List<UniformSlot> uniformLayout = const <UniformSlot>[], | ||
| }) async { | ||
| return RasterPipeline(); | ||
| } | ||
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| /// Associates the default Impeller context with this GpuContext. | ||
| @Native<Handle Function(Handle)>(symbol: 'GpuContext::InitializeDefault') | ||
| external String _initializeDefault(); | ||
| } | ||
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| GpuContext? _defaultGpuContext; | ||
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| /// Returns the default graphics context. | ||
| GpuContext getGpuContext() { | ||
| _defaultGpuContext ??= GpuContext._createDefault(); | ||
| return _defaultGpuContext!; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #include "flutter/lib/ui/gpu/context.h" | ||
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| #include <memory> | ||
| #include <sstream> | ||
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| #include "flutter/fml/log_level.h" | ||
| #include "flutter/fml/logging.h" | ||
| #include "flutter/fml/make_copyable.h" | ||
| #include "flutter/fml/memory/ref_ptr.h" | ||
| #include "flutter/lib/ui/ui_dart_state.h" | ||
| #include "third_party/tonic/dart_wrappable.h" | ||
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| namespace flutter { | ||
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| IMPLEMENT_WRAPPERTYPEINFO(ui, GpuContext); | ||
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| std::string GpuContext::InitializeDefault(Dart_Handle wrapper) { | ||
| auto dart_state = UIDartState::Current(); | ||
| if (!dart_state->IsImpellerEnabled()) { | ||
| return "The GpuContext API requires the Impeller rendering backend to be " | ||
| "enabled."; | ||
| } | ||
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| // Grab the Impeller context from the IO manager. | ||
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| std::promise<std::shared_ptr<impeller::Context>> context_promise; | ||
| auto impeller_context_future = context_promise.get_future(); | ||
| dart_state->GetTaskRunners().GetIOTaskRunner()->PostTask( | ||
| fml::MakeCopyable([promise = std::move(context_promise), | ||
| io_manager = dart_state->GetIOManager()]() mutable { | ||
| promise.set_value(io_manager ? io_manager->GetImpellerContext() | ||
| : nullptr); | ||
| })); | ||
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| auto impeller_context = impeller_context_future.get(); | ||
| if (!impeller_context) { | ||
| return "Unable to retrieve the Impeller context."; | ||
| } | ||
| auto res = fml::MakeRefCounted<GpuContext>(impeller_context); | ||
| res->AssociateWithDartWrapper(wrapper); | ||
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| return ""; | ||
| } | ||
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| GpuContext::GpuContext(std::shared_ptr<impeller::Context> context) | ||
| : context_(std::move(context)) {} | ||
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| GpuContext::~GpuContext() = default; | ||
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| } // namespace flutter |
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