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// Copyright 2018 The Amber Authors.
//
// 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.
#ifndef SRC_DAWN_ENGINE_DAWN_H_
#define SRC_DAWN_ENGINE_DAWN_H_
#include <cstdint>
#include <string>
#include <unordered_map>
#include <vector>
#include "dawn/dawncpp.h"
#include "src/cast_hash.h"
#include "src/command.h"
#include "src/dawn/pipeline_info.h"
#include "src/engine.h"
namespace amber {
namespace dawn {
/// Engine implementation using the Dawn API.
class EngineDawn : public Engine {
public:
EngineDawn();
~EngineDawn() override;
// Engine
// Initialize with given configuration data.
Result Initialize(EngineConfig* config,
Delegate*,
const std::vector<std::string>& features,
const std::vector<std::string>& instance_extensions,
const std::vector<std::string>& device_extensions) override;
// Record info for a pipeline. The Dawn render pipeline will be created
// later. Assumes necessary shader modules have been created. A compute
// pipeline requires a compute shader. A graphics pipeline requires a vertex
// and a fragment shader.
Result CreatePipeline(::amber::Pipeline*) override;
Result DoClearColor(const ClearColorCommand* cmd) override;
Result DoClearStencil(const ClearStencilCommand* cmd) override;
Result DoClearDepth(const ClearDepthCommand* cmd) override;
Result DoClear(const ClearCommand* cmd) override;
Result DoDrawRect(const DrawRectCommand* cmd) override;
Result DoDrawArrays(const DrawArraysCommand* cmd) override;
Result DoCompute(const ComputeCommand* cmd) override;
Result DoEntryPoint(const EntryPointCommand* cmd) override;
Result DoPatchParameterVertices(
const PatchParameterVerticesCommand* cmd) override;
Result DoBuffer(const BufferCommand* cmd) override;
private:
// Returns the Dawn-specific render pipeline for the given command,
// if it exists. Returns nullptr otherwise.
RenderPipelineInfo* GetRenderPipeline(
const ::amber::PipelineCommand* command) {
return pipeline_map_[command->GetPipeline()].render_pipeline.get();
}
// Returns the Dawn-specific compute pipeline for the given command,
// if it exists. Returns nullptr otherwise.
ComputePipelineInfo* GetComputePipeline(
const ::amber::PipelineCommand* command) {
return pipeline_map_[command->GetPipeline()].compute_pipeline.get();
}
// Creates and attaches index, vertex, storage, uniform and depth-stencil
// buffers. Sets up bindings. Also creates textures and texture views if not
// created yet. Used in the Graphics pipeline creation.
Result AttachBuffersAndTextures(RenderPipelineInfo* render_pipeline);
// Creates and attaches index, vertex, storage, uniform and depth-stencil
// buffers. Used in the Compute pipeline creation.
Result AttachBuffers(ComputePipelineInfo* compute_pipeline);
// Creates and submits a command to copy dawn textures back to amber color
// attachments.
Result MapDeviceTextureToHostBuffer(const RenderPipelineInfo& render_pipeline,
const ::dawn::Device& device);
// Creates and submits a command to copy dawn buffers back to amber buffers
Result MapDeviceBufferToHostBuffer(
const ComputePipelineInfo& compute_pipeline,
const ::dawn::Device& device);
// Borrowed from the engine config
::dawn::Device* device_ = nullptr;
// Dawn color attachment textures
std::vector<::dawn::Texture> textures_;
// Views into Dawn color attachment textures
std::vector<::dawn::TextureView> texture_views_;
// Dawn depth/stencil texture
::dawn::Texture depth_stencil_texture_;
// Mapping from the generic engine's Pipeline object to our own Dawn-specific
// pipelines.
std::unordered_map<amber::Pipeline*, ::amber::dawn::Pipeline> pipeline_map_;
};
} // namespace dawn
} // namespace amber
#endif // SRC_DAWN_ENGINE_DAWN_H_
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