commit 62729e65701099931c09684e27103f3e249a60bf · kitten.sh/frag-canvas-element

.changeset/fair-cooks-jam.md

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       ---

     

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       'frag-canvas': patch

     

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       ---

     

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       Fix GLSL 300 ES (WebGL2) transformation

+32 -24

src/frag-canvas-element.ts

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         return [year, month, day, time] as const;

     

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       };

     

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       const preprocessShader = (source: string, isES300: boolean) => {

     

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       const preprocessShader = (source: string) => {

     

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         let header = '';

     

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         let output = source;

     

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         let output = source.trim();

     

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         let isES300 = false;

     

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         if (output.startsWith(VERSION_300)) {

     

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           isES300 = true;

     

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           output = output.slice(VERSION_300.length + 1);

     

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           header += `${VERSION_300}\n`;

     

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         }

     

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         if (!/^\s*precision /.test(output)) header += 'precision highp float;\n';

     

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         if (!/main\s*\(/.test(output)) {

     

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           const ioRe = /\(\s*out\s+vec4\s+(\S+)\s*,\s*in\s+vec2\s+(\S+)\s*\)/g;

     

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           const io = ioRe.exec(source);

     

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           output = output.replace(/mainImage\s*\(/, 'main(').replace(ioRe, '()');

     

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           if (isES300 && io) {

     

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             header += `out vec4 ${io[1]};\n`;

     

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             if (io[2] !== 'gl_FragCoord')

     

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               header += `#define ${io[2]} gl_FragCoord.xy\n`;

     

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           } else if (io) {

     

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             if (io[1] !== 'gl_FragColor') header += `#define ${io[1]} gl_FragColor\n`;

     

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             if (io[2] !== 'gl_FragCoord')

     

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               header += `#define ${io[2]} gl_FragCoord.xy\n`;

     

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           }

     

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         }

     

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         if (isES300 && output.includes('gl_FragColor')) {

     

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           header += 'out vec4 aFragColor;\n';

     

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           header += '#define glFragColor aFragColor.xy\n';

     

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         }

     

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         if (output.includes('iChannel0')) header += 'uniform sampler2D iChannel0;\n';

     

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         if (output.includes('iResolution')) header += 'uniform vec2 iResolution;\n';

     

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         if (output.includes('iChannelResolution'))

     
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         if (output.includes('iChannel')) header += 'uniform float iChannel;\n';

     

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         if (output.includes('iDate')) header += 'uniform vec4 iDate;\n';

     

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         if (isES300 && output.includes('gl_FragColor'))

     

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           header += 'out vec4 gl_FragColor;\n';

     

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         if (isES300 && output.includes('gl_FragCoord'))

     

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           header += 'in vec2 gl_FragCoord;\n';

     

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         if (!/main\s*\(/.test(output)) {

     

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           const ioRe = /\(\s*out\s+vec4\s+(\S+)\s*,\s*in\s+vec2\s+(\S+)\s*\)/g;

     

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           const io = ioRe.exec(source);

     

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           output = output.replace(/mainImage\s*\(/, 'main(').replace(ioRe, '()');

     

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           if (io && io[1] !== 'gl_FragColor')

     

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             header += `#define ${io[1]} gl_FragColor\n`;

     

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           if (io && io[2] !== 'gl_FragCoord')

     

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             header += `#define ${io[2]} gl_FragCoord.xy\n`;

     

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         }

     

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         if (!isES300) output = output.replace(/texture\s+\(/g, 'texture2D(');

     

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         if (isES300) output = output.replace(/texture2D\s*\(/g, 'texture(');

     

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         return `${header}\n${output}`;

     

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         return {

     

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           source: `${header}\n${output}`,

     

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           isES300,

     

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         };

     

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       };

     

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       interface InitState {

     
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           },

     

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           updateFragShader(fragSource: string) {

     

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             fragSource = fragSource.trim();

     

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             const isES300 = /\s+#version 300/i.test(fragSource);

     

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             gl.shaderSource(fragShader, preprocessShader(fragSource, isES300));

     

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             const preprocessed = preprocessShader(fragSource);

     

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             gl.shaderSource(fragShader, preprocessed.source);

     

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             gl.compileShader(fragShader);

     

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             const vertShader = isES300 ? vertShader300 : vertShader100;

     

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             const vertShader = preprocessed.isES300 ? vertShader300 : vertShader100;

     

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             gl.attachShader(program, vertShader);

     

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             gl.attachShader(program, fragShader);

     

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