48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
'use strict';
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"use strict";
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const fragTemplate = [
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"precision mediump float;",
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"void main(void){",
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"float test = 0.1;",
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"%forloop%",
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"gl_FragColor = vec4(0.0);",
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"}"
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].join("\n");
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function generateIfTestSrc(maxIfs) {
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let src = "";
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for (let i = 0; i < maxIfs; ++i) {
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if (i > 0) {
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src += "\nelse ";
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}
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if (i < maxIfs - 1) {
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src += `if(test == ${i}.0){}`;
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}
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}
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return src;
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}
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function checkMaxIfStatementsInShader(maxIfs, gl) {
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if (maxIfs === 0) {
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throw new Error("Invalid value of `0` passed to `checkMaxIfStatementsInShader`");
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}
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const shader = gl.createShader(gl.FRAGMENT_SHADER);
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try {
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while (true) {
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const fragmentSrc = fragTemplate.replace(/%forloop%/gi, generateIfTestSrc(maxIfs));
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gl.shaderSource(shader, fragmentSrc);
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gl.compileShader(shader);
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if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
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maxIfs = maxIfs / 2 | 0;
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} else {
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break;
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}
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}
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} finally {
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gl.deleteShader(shader);
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}
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return maxIfs;
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}
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exports.checkMaxIfStatementsInShader = checkMaxIfStatementsInShader;
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//# sourceMappingURL=checkMaxIfStatementsInShader.js.map
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