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Add interpolation option for varying in WGSL #14893

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Mar 25, 2024
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Add interpolation option for varying in WGSL #14893

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10 changes: 6 additions & 4 deletions packages/dev/core/src/Engines/WebGPU/webgpuShaderProcessorsWGSL.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -111,11 +111,13 @@ export class WebGPUShaderProcessorWGSL extends WebGPUShaderProcessor {
}

public varyingProcessor(varying: string, isFragment: boolean, preProcessors: { [key: string]: string }) {
const varyingRegex = /\s*varying\s+(?:(?:highp)?|(?:lowp)?)\s*(\S+)\s*:\s*(.+)\s*;/gm;
const varyingRegex = /\s*(flat|linear|perspective)?\s*(center|centroid|sample)?\s*varying\s+(?:(?:highp)?|(?:lowp)?)\s*(\S+)\s*:\s*(.+)\s*;/gm;
const match = varyingRegex.exec(varying);
if (match !== null) {
const varyingType = match[2];
const name = match[1];
const interpolationType = match[1] ?? "perspective";
const interpolationSampling = match[2] ?? "center";
const varyingType = match[4];
const name = match[3];
let location: number;
if (isFragment) {
location = this._webgpuProcessingContext.availableVaryings[name];
Expand All @@ -125,7 +127,7 @@ export class WebGPUShaderProcessorWGSL extends WebGPUShaderProcessor {
} else {
location = this._webgpuProcessingContext.getVaryingNextLocation(varyingType, this._getArraySize(name, varyingType, preProcessors)[2]);
this._webgpuProcessingContext.availableVaryings[name] = location;
this._varyingsWGSL.push(` @location(${location}) ${name} : ${varyingType},`);
this._varyingsWGSL.push(` @location(${location}) @interpolate(${interpolationType}, ${interpolationSampling}) ${name} : ${varyingType},`);
this._varyingNamesWGSL.push(name);
}

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