@pixi/core
Version:
Core PixiJS
33 lines (32 loc) • 1 kB
JavaScript
;
const fragTemplate = [
"precision mediump float;",
"void main(void){",
"float test = 0.1;",
"%forloop%",
"gl_FragColor = vec4(0.0);",
"}"
].join(`
`);
function generateIfTestSrc(maxIfs) {
let src = "";
for (let i = 0; i < maxIfs; ++i)
i > 0 && (src += `
else `), i < maxIfs - 1 && (src += `if(test == ${i}.0){}`);
return src;
}
function checkMaxIfStatementsInShader(maxIfs, gl) {
if (maxIfs === 0)
throw new Error("Invalid value of `0` passed to `checkMaxIfStatementsInShader`");
const shader = gl.createShader(gl.FRAGMENT_SHADER);
for (; ; ) {
const fragmentSrc = fragTemplate.replace(/%forloop%/gi, generateIfTestSrc(maxIfs));
if (gl.shaderSource(shader, fragmentSrc), gl.compileShader(shader), !gl.getShaderParameter(shader, gl.COMPILE_STATUS))
maxIfs = maxIfs / 2 | 0;
else
break;
}
return maxIfs;
}
exports.checkMaxIfStatementsInShader = checkMaxIfStatementsInShader;
//# sourceMappingURL=checkMaxIfStatementsInShader.js.map