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"use strict";
let Example = {
initialize: async function (slang, canvas) {
async function render(shaders) {
if (!navigator.gpu) {
throw new Error("WebGPU not supported on this browser.");
}
const adapter = await navigator.gpu.requestAdapter();
if (!adapter) {
throw new Error("No appropriate GPUAdapter found.");
}
const device = await adapter.requestDevice();
const context = canvas.getContext("webgpu");
const canvasFormat = navigator.gpu.getPreferredCanvasFormat();
context.configure({
device: device,
format: canvasFormat,
});
const vertexBufferLayout = {
arrayStride: 8,
attributes: [{
format: "float32x2",
offset: 0,
shaderLocation: 0,
}],
};
const pipeline = device.createRenderPipeline({
label: "Pipeline",
layout: "auto",
vertex: {
module: device.createShaderModule({
label: "Vertex shader module",
code: shaders.vertex
}),
entryPoint: "vertexMain",
buffers: [vertexBufferLayout]
},
fragment: {
module: device.createShaderModule({
label: "Fragment shader module",
code: shaders.fragment
}),
entryPoint: "fragmentMain",
targets: [{
format: canvasFormat
}]
}
});
const vertices = new Float32Array([
0.0, -0.8,
+0.8, +0.8,
-0.8, +0.8,
]);
const vertexBuffer = device.createBuffer({
label: "Triangle vertices",
size: vertices.byteLength,
usage: GPUBufferUsage.VERTEX | GPUBufferUsage.COPY_DST,
});
const bufferOffset = 0;
device.queue.writeBuffer(vertexBuffer, bufferOffset, vertices);
const encoder = device.createCommandEncoder();
const pass = encoder.beginRenderPass({
colorAttachments: [{
view: context.getCurrentTexture().createView(),
loadOp: "clear",
clearValue: { r: 0, g: 0, b: 0, a: 1 },
storeOp: "store",
}]
});
pass.setPipeline(pipeline);
const vertexBufferSlot = 0;
pass.setVertexBuffer(vertexBufferSlot, vertexBuffer);
pass.draw(vertices.length / 2);
pass.end();
const commandBuffer = encoder.finish();
device.queue.submit([commandBuffer]);
}
const slangCode = await fetch("shader.slang").then(r => r.text());
var wasmCompileTarget = null;
var compileTargetMap = slang.module.getCompileTargets();
for (var i = 0; i < compileTargetMap.length; i++) {
var target = compileTargetMap[i];
if(target.name == "WGSL") {
wasmCompileTarget = target.value;
}
}
if (wasmCompileTarget === null) {
throw new Error("Slang/WASM module doesn't support WGSL compile target.");
}
var slangSession = slang.globalSession.createSession(wasmCompileTarget);
if (!slangSession) {
throw new Error("Failed to create global Slang session.");
}
var wgslShaders = null;
try {
var module = slangSession.loadModuleFromSource(
slangCode, "shader", '/shader.slang'
);
var vertexEntryPoint = module.findAndCheckEntryPoint(
"vertexMain", slang.constants.STAGE_VERTEX
);
var fragmentEntryPoint = module.findAndCheckEntryPoint(
"fragmentMain", slang.constants.STAGE_FRAGMENT
);
var linkedProgram = slangSession.createCompositeComponentType([
module, vertexEntryPoint, fragmentEntryPoint
]).link();
wgslShaders = {
vertex: linkedProgram.getEntryPointCode(
0 /* entryPointIndex */, 0 /* targetIndex */
),
fragment: linkedProgram.getEntryPointCode(
1 /* entryPointIndex */, 0 /* targetIndex */
),
};
} finally {
if (slangSession) {
slangSession.delete();
}
}
if (!wgslShaders) {
throw new Error("Failed to compile WGSL shaders.");
}
render(wgslShaders);
}
}
var Module = {
onRuntimeInitialized: function() {
const canvas = document.querySelector("canvas");
var globalSlangSession = Module.createGlobalSession();
if (!globalSlangSession) {
throw new Error("Failed to create global Slang session.");
}
const slang = {
module: Module,
globalSession: globalSlangSession,
constants: {
STAGE_VERTEX: 1,
STAGE_FRAGMENT: 5,
},
};
Example.initialize(slang, canvas);
},
};
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