@pixi/core/lib/shader/utils/generateProgram.mjs

Core PixiJS

import { GLProgram } from '../GLProgram.mjs';
import { compileShader } from './compileShader.mjs';
import { defaultValue } from './defaultValue.mjs';
import { getAttributeData } from './getAttributeData.mjs';
import { getUniformData } from './getUniformData.mjs';
import { logProgramError } from './logProgramError.mjs';

function generateProgram(gl, program) {
  const glVertShader = compileShader(gl, gl.VERTEX_SHADER, program.vertexSrc);
  const glFragShader = compileShader(gl, gl.FRAGMENT_SHADER, program.fragmentSrc);
  const webGLProgram = gl.createProgram();
  gl.attachShader(webGLProgram, glVertShader);
  gl.attachShader(webGLProgram, glFragShader);
  const transformFeedbackVaryings = program.extra?.transformFeedbackVaryings;
  if (transformFeedbackVaryings) {
    if (typeof gl.transformFeedbackVaryings !== "function") {
      console.warn(`TransformFeedback is not supported but TransformFeedbackVaryings are given.`);
    } else {
      gl.transformFeedbackVaryings(webGLProgram, transformFeedbackVaryings.names, transformFeedbackVaryings.bufferMode === "separate" ? gl.SEPARATE_ATTRIBS : gl.INTERLEAVED_ATTRIBS);
    }
  }
  gl.linkProgram(webGLProgram);
  if (!gl.getProgramParameter(webGLProgram, gl.LINK_STATUS)) {
    logProgramError(gl, webGLProgram, glVertShader, glFragShader);
  }
  program.attributeData = getAttributeData(webGLProgram, gl);
  program.uniformData = getUniformData(webGLProgram, gl);
  if (!/^[ \t]*#[ \t]*version[ \t]+300[ \t]+es[ \t]*$/m.test(program.vertexSrc)) {
    const keys = Object.keys(program.attributeData);
    keys.sort((a, b) => a > b ? 1 : -1);
    for (let i = 0; i < keys.length; i++) {
      program.attributeData[keys[i]].location = i;
      gl.bindAttribLocation(webGLProgram, i, keys[i]);
    }
    gl.linkProgram(webGLProgram);
  }
  gl.deleteShader(glVertShader);
  gl.deleteShader(glFragShader);
  const uniformData = {};
  for (const i in program.uniformData) {
    const data = program.uniformData[i];
    uniformData[i] = {
      location: gl.getUniformLocation(webGLProgram, i),
      value: defaultValue(data.type, data.size)
    };
  }
  const glProgram = new GLProgram(webGLProgram, uniformData);
  return glProgram;
}

export { generateProgram };
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