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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"
#include "utils/SystemUtils.h"
#include "utils/WGPUHelpers.h"
WGPUDevice device;
WGPUQueue queue;
WGPUSwapChain swapchain;
WGPURenderPipeline pipeline;
WGPUTextureFormat swapChainFormat;
void init() {
device = CreateCppDawnDevice().Release();
queue = wgpuDeviceGetDefaultQueue(device);
{
WGPUSwapChainDescriptor descriptor = {};
descriptor.implementation = GetSwapChainImplementation();
swapchain = wgpuDeviceCreateSwapChain(device, nullptr, &descriptor);
}
swapChainFormat = static_cast<WGPUTextureFormat>(GetPreferredSwapChainTextureFormat());
wgpuSwapChainConfigure(swapchain, swapChainFormat, WGPUTextureUsage_OutputAttachment, 640, 480);
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";
WGPUShaderModule vsModule =
utils::CreateShaderModule(wgpu::Device(device), utils::SingleShaderStage::Vertex, vs)
.Release();
const char* fs =
"#version 450\n"
"layout(location = 0) out vec4 fragColor;\n"
"void main() {\n"
" fragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
"}\n";
WGPUShaderModule fsModule =
utils::CreateShaderModule(device, utils::SingleShaderStage::Fragment, fs).Release();
{
WGPURenderPipelineDescriptor descriptor = {};
descriptor.vertexStage.module = vsModule;
descriptor.vertexStage.entryPoint = "main";
WGPUProgrammableStageDescriptor fragmentStage = {};
fragmentStage.module = fsModule;
fragmentStage.entryPoint = "main";
descriptor.fragmentStage = &fragmentStage;
descriptor.sampleCount = 1;
WGPUBlendDescriptor blendDescriptor = {};
blendDescriptor.operation = WGPUBlendOperation_Add;
blendDescriptor.srcFactor = WGPUBlendFactor_One;
blendDescriptor.dstFactor = WGPUBlendFactor_One;
WGPUColorStateDescriptor colorStateDescriptor = {};
colorStateDescriptor.format = swapChainFormat;
colorStateDescriptor.alphaBlend = blendDescriptor;
colorStateDescriptor.colorBlend = blendDescriptor;
colorStateDescriptor.writeMask = WGPUColorWriteMask_All;
descriptor.colorStateCount = 1;
descriptor.colorStates = &colorStateDescriptor;
WGPUPipelineLayoutDescriptor pl = {};
pl.bindGroupLayoutCount = 0;
pl.bindGroupLayouts = nullptr;
descriptor.layout = wgpuDeviceCreatePipelineLayout(device, &pl);
WGPUVertexStateDescriptor vertexState = {};
vertexState.indexFormat = WGPUIndexFormat_Uint32;
vertexState.vertexBufferCount = 0;
vertexState.vertexBuffers = nullptr;
descriptor.vertexState = &vertexState;
WGPURasterizationStateDescriptor rasterizationState = {};
rasterizationState.frontFace = WGPUFrontFace_CCW;
rasterizationState.cullMode = WGPUCullMode_None;
rasterizationState.depthBias = 0;
rasterizationState.depthBiasSlopeScale = 0.0;
rasterizationState.depthBiasClamp = 0.0;
descriptor.rasterizationState = &rasterizationState;
descriptor.primitiveTopology = WGPUPrimitiveTopology_TriangleList;
descriptor.sampleMask = 0xFFFFFFFF;
descriptor.alphaToCoverageEnabled = false;
descriptor.depthStencilState = nullptr;
pipeline = wgpuDeviceCreateRenderPipeline(device, &descriptor);
}
wgpuShaderModuleRelease(vsModule);
wgpuShaderModuleRelease(fsModule);
}
void frame() {
WGPUTextureView backbufferView = wgpuSwapChainGetCurrentTextureView(swapchain);
WGPURenderPassDescriptor renderpassInfo = {};
WGPURenderPassColorAttachmentDescriptor colorAttachment = {};
{
colorAttachment.attachment = backbufferView;
colorAttachment.resolveTarget = nullptr;
colorAttachment.clearColor = { 0.0f, 0.0f, 0.0f, 0.0f };
colorAttachment.loadOp = WGPULoadOp_Clear;
colorAttachment.storeOp = WGPUStoreOp_Store;
renderpassInfo.colorAttachmentCount = 1;
renderpassInfo.colorAttachments = &colorAttachment;
renderpassInfo.depthStencilAttachment = nullptr;
}
WGPUCommandBuffer commands;
{
WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(device, nullptr);
WGPURenderPassEncoder pass = wgpuCommandEncoderBeginRenderPass(encoder, &renderpassInfo);
wgpuRenderPassEncoderSetPipeline(pass, pipeline);
wgpuRenderPassEncoderDraw(pass, 3, 1, 0, 0);
wgpuRenderPassEncoderEndPass(pass);
wgpuRenderPassEncoderRelease(pass);
commands = wgpuCommandEncoderFinish(encoder, nullptr);
wgpuCommandEncoderRelease(encoder);
}
wgpuQueueSubmit(queue, 1, &commands);
wgpuCommandBufferRelease(commands);
wgpuSwapChainPresent(swapchain);
wgpuTextureViewRelease(backbufferView);
DoFlush();
}
int main(int argc, const char* argv[]) {
if (!InitSample(argc, argv)) {
return 1;
}
init();
while (!ShouldQuit()) {
frame();
utils::USleep(16000);
}
// TODO release stuff
}
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