WebGPU图形编程（3）：构建三角形图元<学习引自徐博士教程>
作者：互联网
一、首先修改你的index.html文件
请注意主要在html页面修改添加的是需要加选择项："triangle-list"和"triangle-strip",如果你不理解这两个关键词，移步查看webgpu文档：https://www.orillusion.com/zh/webgpu.html#primitive-state 的第10.3.2节Primitive state查看原始状态可以创建哪些图元。
1 <!DOCTYPE html> 2 <head> 3 <meta charset="utf-8"> 4 <meta http-equiv="X-UA-Compatible" content="IE=edge"> 5 <title>WebGPU Step-by-Step 6</title> 6 <meta name="description" content=""> 7 <meta name="viewport" content="width=device-width, initial-scale=1"> 8 </head> 9 10 <body> 11 <div> 12 <h1> Create Triangle Primitives</h1><br> <!--主标题--> 13 <label><b>Select a primitive type:</Select></b></label> 14 <select id = "id-primitive"> 15 <option value="triangle-list"> triangle-list</option> 16 <option value="triangle-strip"> triangle-strip</option> 17 18 </select> 19 <br><br> 20 <canvas id="canvas-webgpu" width="640" height="480"></canvas><!--使用canvas画布来绘制webgpu图形--> 21 </div> 22 <script src="main.bundle.js"></script><!--脚本调用打包的bundle.js--> 23 </body> 24 </html>
二、接下来修改添加shaders文件代码
主要就是修改vertex和fragment添加为9个顶点和9个颜色，满足triangle顶点要求。
1 export const Shaders = () => {
2 const vertex = `
3 struct Output {
4 [[builtin(position)]] Position : vec4<f32>;
5 [[location(0)]] vColor : vec4<f32>;
6 };
7
8 [[stage(vertex)]]
9 fn main([[builtin(vertex_index)]] VertexIndex: u32) -> Output {
10 var pos : array<vec2<f32>, 9> = array<vec2<f32>, 9>(
11 vec2<f32>(-0.63, 0.80),
12 vec2<f32>(-0.65, 0.20),
13 vec2<f32>(-0.20, 0.60),
14 vec2<f32>(-0.37, -0.07),
15 vec2<f32>( 0.05, 0.18),
16 vec2<f32>(-0.13, -0.40),
17 vec2<f32>( 0.30, -0.13),
18 vec2<f32>( 0.13, -0.64),
19 vec2<f32>( 0.70, -0.30)
20 );
21
22 var color : array<vec3<f32>, 9> = array<vec3<f32>, 9>(
23 vec3<f32>(1.0, 0.0, 0.0),
24 vec3<f32>(0.0, 1.0, 0.0),
25 vec3<f32>(0.0, 0.0, 1.0),
26 vec3<f32>(1.0, 0.0, 0.0),
27 vec3<f32>(0.0, 1.0, 0.0),
28 vec3<f32>(0.0, 0.0, 1.0),
29 vec3<f32>(1.0, 0.0, 0.0),
30 vec3<f32>(0.0, 1.0, 0.0),
31 vec3<f32>(0.0, 0.0, 1.0),
32 );
33
34 var output: Output;
35 output.Position = vec4<f32>(pos[VertexIndex], 0.0, 1.0);
36 output.vColor = vec4<f32>(color[VertexIndex], 1.0);
37 return output;
38 }`
39
40 const fragment = `
41 [[stage(fragment)]]
42 fn main([[location(0)]] vColor: vec4<f32>) -> [[location(0)]] vec4<f32> {
43 return vColor;
44 }
45 `;
46 return {vertex, fragment};
47 }
三、修改添加main.ts文件
主要是你的primitiveType需要对应"triangle-list"（每三个顶点创建一个三角形）和"triangle-strip"（先创建一个三角形，之后每添加一个顶点就会添加一个三角形）
import $ from 'jquery';
import { CheckWebGPU } from './helper';
import { Shaders } from './sharder';
const CreatePrimitive = async (primitiveType = 'triangle-list') => {
const checkgpu = CheckWebGPU();
if(checkgpu.includes('Your current browser does not support WebGPU!')){
console.log(checkgpu);
throw('Your current browser does not support WebGPU!');
}
let indexFormat = undefined;
if(primitiveType === 'triangle-strip'){
indexFormat = 'uint32'
}
const canvas = document.getElementById('canvas-webgpu') as HTMLCanvasElement;
const adapter = await navigator.gpu.requestAdapter() as GPUAdapter; //创建一个adapter(适配器)去调用适配器
const device = await adapter.requestDevice() as GPUDevice; //实例化对象，设备可以创建缓存、纹理、渲染管线、着色器模块
const context = canvas.getContext('webgpu') as unknown as GPUCanvasContext;
const format = 'bgra8unorm';
/*const swapChain = context.configureSwapChain({
device: device,
format: format,
});*/
context.configure({ //
device: device,
format: format,
});
const shader = Shaders();
const pipeline = device.createRenderPipeline({
vertex: {
module: device.createShaderModule({
code: shader.vertex //调用顶点着色器代码
}),
entryPoint: "main" //入口函数
},
fragment: {
module: device.createShaderModule({
code: shader.fragment //调用片元着色器代码
}),
entryPoint: "main", //入口函数
targets: [{
format: format as GPUTextureFormat //即上文的最终渲染色彩格式
}]
},
primitive:{ //绘制模式
topology: primitiveType as GPUPrimitiveTopology,
stripIndexFormat: indexFormat as GPUIndexFormat //按照三角形绘制
}
});
const commandEncoder = device.createCommandEncoder(); //创建指令编码器CommandEncoder
const textureView = context.getCurrentTexture().createView();
const renderPass = commandEncoder.beginRenderPass({ //创建渲染通道，让指令开启渲染管道
colorAttachments: [{
view: textureView,
loadValue: { r: 0.5, g: 0.5, b: 0.8, a: 1.0 }, //background color
storeOp: 'store'
}]
});
renderPass.setPipeline(pipeline); //进行通道和管线的连接
renderPass.draw(9, 1, 0, 0);
renderPass.endPass();
device.queue.submit([commandEncoder.finish()]); //结束指令编码
}
CreatePrimitive();
$('#id-primitive').on('change', ()=>{
const primitiveType = $('#id-primitive').val() as string;
CreatePrimitive(primitiveType);
});
四、打包文件
npm run prod
五、完成工作，启用浏览器查看
其实步骤简单，重要的是理解main文件和shaders着色器。
标签：const,0.0,WebGPU,编程,vec2,vec3,device,1.0,三角形 来源： https://www.cnblogs.com/wenhao0807/p/15826851.html