dawn-cmake/examples/CHelloTriangle.cpp

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// Copyright 2017 The Dawn 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.
#include "SampleUtils.h"
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#include "utils/DawnHelpers.h"
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#include "utils/SystemUtils.h"
dawnDevice device;
dawnQueue queue;
dawnSwapChain swapchain;
dawnRenderPipeline pipeline;
dawnTextureFormat swapChainFormat;
void init() {
device = CreateCppDawnDevice().Release();
queue = dawnDeviceCreateQueue(device);
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{
dawnSwapChainBuilder builder = dawnDeviceCreateSwapChainBuilder(device);
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uint64_t swapchainImpl = GetSwapChainImplementation();
dawnSwapChainBuilderSetImplementation(builder, swapchainImpl);
swapchain = dawnSwapChainBuilderGetResult(builder);
dawnSwapChainBuilderRelease(builder);
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}
swapChainFormat = static_cast<dawnTextureFormat>(GetPreferredSwapChainTextureFormat());
dawnSwapChainConfigure(swapchain, swapChainFormat, DAWN_TEXTURE_USAGE_BIT_OUTPUT_ATTACHMENT, 640,
480);
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const char* vs =
"#version 450\n"
"const vec2 pos[3] = vec2[3](vec2(0.0f, 0.5f), vec2(-0.5f, -0.5f), vec2(0.5f, -0.5f));\n"
"void main() {\n"
" gl_Position = vec4(pos[gl_VertexIndex], 0.0, 1.0);\n"
"}\n";
dawnShaderModule vsModule = utils::CreateShaderModule(dawn::Device(device), dawn::ShaderStage::Vertex, vs).Release();
const char* fs =
"#version 450\n"
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"layout(location = 0) out vec4 fragColor;"
"void main() {\n"
" fragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
"}\n";
dawnShaderModule fsModule = utils::CreateShaderModule(device, dawn::ShaderStage::Fragment, fs).Release();
{
dawnRenderPipelineDescriptor descriptor;
descriptor.nextInChain = nullptr;
dawnPipelineStageDescriptor vertexStage;
vertexStage.nextInChain = nullptr;
vertexStage.module = vsModule;
vertexStage.entryPoint = "main";
descriptor.vertexStage = &vertexStage;
dawnPipelineStageDescriptor fragmentStage;
fragmentStage.nextInChain = nullptr;
fragmentStage.module = fsModule;
fragmentStage.entryPoint = "main";
descriptor.fragmentStage = &fragmentStage;
dawnAttachmentsStateDescriptor attachmentsState;
attachmentsState.nextInChain = nullptr;
attachmentsState.numColorAttachments = 1;
dawnAttachmentDescriptor colorAttachment = {nullptr, swapChainFormat};
dawnAttachmentDescriptor* colorAttachmentPtr[] = {&colorAttachment};
attachmentsState.colorAttachments = colorAttachmentPtr;
attachmentsState.hasDepthStencilAttachment = false;
// Even with hasDepthStencilAttachment = false, depthStencilAttachment must point to valid
// data because we don't have optional substructures yet.
attachmentsState.depthStencilAttachment = &colorAttachment;
descriptor.attachmentsState = &attachmentsState;
descriptor.sampleCount = 1;
descriptor.numBlendStates = 1;
dawnBlendDescriptor blendDescriptor;
blendDescriptor.operation = DAWN_BLEND_OPERATION_ADD;
blendDescriptor.srcFactor = DAWN_BLEND_FACTOR_ONE;
blendDescriptor.dstFactor = DAWN_BLEND_FACTOR_ONE;
dawnBlendStateDescriptor blendStateDescriptor;
blendStateDescriptor.nextInChain = nullptr;
blendStateDescriptor.alphaBlend = blendDescriptor;
blendStateDescriptor.colorBlend = blendDescriptor;
blendStateDescriptor.colorWriteMask = DAWN_COLOR_WRITE_MASK_ALL;
descriptor.blendStates = &blendStateDescriptor;
dawnPipelineLayoutDescriptor pl;
pl.nextInChain = nullptr;
pl.numBindGroupLayouts = 0;
pl.bindGroupLayouts = nullptr;
descriptor.layout = dawnDeviceCreatePipelineLayout(device, &pl);
dawnInputStateBuilder inputStateBuilder = dawnDeviceCreateInputStateBuilder(device);
descriptor.inputState = dawnInputStateBuilderGetResult(inputStateBuilder);
dawnInputStateBuilderRelease(inputStateBuilder);
descriptor.indexFormat = DAWN_INDEX_FORMAT_UINT32;
descriptor.primitiveTopology = DAWN_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
dawnStencilStateFaceDescriptor stencilFace;
stencilFace.compare = DAWN_COMPARE_FUNCTION_ALWAYS;
stencilFace.failOp = DAWN_STENCIL_OPERATION_KEEP;
stencilFace.depthFailOp = DAWN_STENCIL_OPERATION_KEEP;
stencilFace.passOp = DAWN_STENCIL_OPERATION_KEEP;
dawnDepthStencilStateDescriptor depthStencilState;
depthStencilState.nextInChain = nullptr;
depthStencilState.depthWriteEnabled = false;
depthStencilState.depthCompare = DAWN_COMPARE_FUNCTION_ALWAYS;
depthStencilState.stencilBack = stencilFace;
depthStencilState.stencilFront = stencilFace;
depthStencilState.stencilReadMask = 0xff;
depthStencilState.stencilWriteMask = 0xff;
descriptor.depthStencilState = &depthStencilState;
pipeline = dawnDeviceCreateRenderPipeline(device, &descriptor);
dawnInputStateRelease(descriptor.inputState);
}
dawnShaderModuleRelease(vsModule);
dawnShaderModuleRelease(fsModule);
}
void frame() {
dawnTexture backbuffer = dawnSwapChainGetNextTexture(swapchain);
dawnTextureView backbufferView;
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{
backbufferView = dawnTextureCreateDefaultTextureView(backbuffer);
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}
dawnRenderPassDescriptor renderpassInfo;
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{
dawnRenderPassDescriptorBuilder builder = dawnDeviceCreateRenderPassDescriptorBuilder(device);
dawnRenderPassColorAttachmentDescriptor colorAttachment;
colorAttachment.attachment = backbufferView;
colorAttachment.resolveTarget = nullptr;
colorAttachment.clearColor = { 0.0f, 0.0f, 0.0f, 0.0f };
colorAttachment.loadOp = DAWN_LOAD_OP_CLEAR;
colorAttachment.storeOp = DAWN_STORE_OP_STORE;
dawnRenderPassDescriptorBuilderSetColorAttachments(builder, 1, &colorAttachment);
renderpassInfo = dawnRenderPassDescriptorBuilderGetResult(builder);
dawnRenderPassDescriptorBuilderRelease(builder);
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}
dawnCommandBuffer commands;
{
dawnCommandBufferBuilder builder = dawnDeviceCreateCommandBufferBuilder(device);
dawnRenderPassEncoder pass = dawnCommandBufferBuilderBeginRenderPass(builder, renderpassInfo);
dawnRenderPassEncoderSetPipeline(pass, pipeline);
dawnRenderPassEncoderDraw(pass, 3, 1, 0, 0);
dawnRenderPassEncoderEndPass(pass);
dawnRenderPassEncoderRelease(pass);
commands = dawnCommandBufferBuilderGetResult(builder);
dawnCommandBufferBuilderRelease(builder);
}
dawnQueueSubmit(queue, 1, &commands);
dawnCommandBufferRelease(commands);
dawnSwapChainPresent(swapchain, backbuffer);
dawnRenderPassDescriptorRelease(renderpassInfo);
dawnTextureViewRelease(backbufferView);
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DoFlush();
}
int main(int argc, const char* argv[]) {
if (!InitSample(argc, argv)) {
return 1;
}
init();
while (!ShouldQuit()) {
frame();
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utils::USleep(16000);
}
// TODO release stuff
}