dawn-cmake/examples/HelloCompute.cpp

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// Copyright 2017 The NXT 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/NXTHelpers.h"
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#include "utils/SystemUtils.h"
#include <string.h>
nxt::Device device;
nxt::Queue queue;
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nxt::SwapChain swapchain;
nxt::TextureView depthStencilView;
nxt::Buffer buffer;
nxt::RenderPipeline renderPipeline;
nxt::BindGroup renderBindGroup;
nxt::ComputePipeline computePipeline;
nxt::BindGroup computeBindGroup;
void init() {
device = CreateCppNXTDevice();
queue = device.CreateQueueBuilder().GetResult();
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swapchain = GetSwapChain(device);
swapchain.Configure(GetPreferredSwapChainTextureFormat(),
nxt::TextureUsageBit::OutputAttachment, 640, 480);
struct {uint32_t a; float b;} s;
memset(&s, 0, sizeof(s));
buffer = device.CreateBufferBuilder()
.SetAllowedUsage(nxt::BufferUsageBit::TransferDst | nxt::BufferUsageBit::Uniform | nxt::BufferUsageBit::Storage)
.SetInitialUsage(nxt::BufferUsageBit::TransferDst)
.SetSize(sizeof(s))
.GetResult();
buffer.SetSubData(0, sizeof(s), reinterpret_cast<uint8_t*>(&s));
nxt::BufferView view = buffer.CreateBufferViewBuilder()
.SetExtent(0, sizeof(s))
.GetResult();
{
nxt::ShaderModule module = utils::CreateShaderModule(device, nxt::ShaderStage::Compute, R"(
#version 450
layout(set = 0, binding = 0) buffer myBlock {
int a;
float b;
} myStorage;
void main() {
myStorage.a = (myStorage.a + 1) % 256;
myStorage.b = mod((myStorage.b + 0.02), 1.0);
})"
);
nxt::BindGroupLayout bgl = device.CreateBindGroupLayoutBuilder()
.SetBindingsType(nxt::ShaderStageBit::Compute, nxt::BindingType::StorageBuffer, 0, 1)
.GetResult();
nxt::PipelineLayout pl = device.CreatePipelineLayoutBuilder()
.SetBindGroupLayout(0, bgl)
.GetResult();
computePipeline = device.CreateComputePipelineBuilder()
.SetLayout(pl)
.SetStage(nxt::ShaderStage::Compute, module, "main")
.GetResult();
computeBindGroup = device.CreateBindGroupBuilder()
.SetLayout(bgl)
.SetUsage(nxt::BindGroupUsage::Frozen)
.SetBufferViews(0, 1, &view)
.GetResult();
}
{
nxt::ShaderModule vsModule = utils::CreateShaderModule(device, nxt::ShaderStage::Vertex, R"(
#version 450
const vec2 pos[3] = vec2[3](vec2(0.0f, 0.5f), vec2(-0.5f, -0.5f), vec2(0.5f, -0.5f));
void main() {
gl_Position = vec4(pos[gl_VertexIndex], 0.5, 1.0);
})"
);
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nxt::ShaderModule fsModule =
utils::CreateShaderModule(device, nxt::ShaderStage::Fragment, R"(
#version 450
layout(set = 0, binding = 0) uniform myBlock {
int a;
float b;
} myUbo;
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layout(location = 0) out vec4 fragColor;
void main() {
fragColor = vec4(1.0, myUbo.a / 255.0, myUbo.b, 1.0);
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})");
nxt::BindGroupLayout bgl = device.CreateBindGroupLayoutBuilder()
.SetBindingsType(nxt::ShaderStageBit::Fragment, nxt::BindingType::UniformBuffer, 0, 1)
.GetResult();
nxt::PipelineLayout pl = device.CreatePipelineLayoutBuilder()
.SetBindGroupLayout(0, bgl)
.GetResult();
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depthStencilView = CreateDefaultDepthStencilView(device);
renderPipeline = device.CreateRenderPipelineBuilder()
.SetColorAttachmentFormat(0, GetPreferredSwapChainTextureFormat())
.SetDepthStencilAttachmentFormat(nxt::TextureFormat::D32FloatS8Uint)
.SetLayout(pl)
.SetStage(nxt::ShaderStage::Vertex, vsModule, "main")
.SetStage(nxt::ShaderStage::Fragment, fsModule, "main")
.GetResult();
renderBindGroup = device.CreateBindGroupBuilder()
.SetLayout(bgl)
.SetUsage(nxt::BindGroupUsage::Frozen)
.SetBufferViews(0, 1, &view)
.GetResult();
}
}
void frame() {
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nxt::Texture backbuffer;
nxt::RenderPassInfo renderPass;
GetNextRenderPassInfo(device, swapchain, depthStencilView, &backbuffer, &renderPass);
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nxt::CommandBuffer commands = device.CreateCommandBufferBuilder()
.TransitionBufferUsage(buffer, nxt::BufferUsageBit::Storage)
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.BeginComputePass()
.SetComputePipeline(computePipeline)
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.SetBindGroup(0, computeBindGroup)
.Dispatch(1, 1, 1)
.EndComputePass()
.TransitionBufferUsage(buffer, nxt::BufferUsageBit::Uniform)
.BeginRenderPass(renderPass)
.SetRenderPipeline(renderPipeline)
.SetBindGroup(0, renderBindGroup)
.DrawArrays(3, 1, 0, 0)
.EndRenderPass()
.GetResult();
queue.Submit(1, &commands);
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backbuffer.TransitionUsage(nxt::TextureUsageBit::Present);
swapchain.Present(backbuffer);
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
}