Method _createProgram

src/tools/texture-lab/renderer.js:108–145

(vertexSource, fragmentSource)

  }

  _createProgram(vertexSource, fragmentSource) {
    const gl = this.gl;

    const vertexShader = this._compileShader(vertexSource, gl.VERTEX_SHADER);
    const fragmentShader = this._compileShader(fragmentSource, gl.FRAGMENT_SHADER);

    const program = gl.createProgram();
    gl.attachShader(program, vertexShader);
    gl.attachShader(program, fragmentShader);
    gl.linkProgram(program);

    if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
      const error = gl.getProgramInfoLog(program);
      gl.deleteProgram(program);
      throw new Error(`Program link error: ${error}`);
    }

    // Once linked, the individual shader objects are no longer needed; detach
    // and delete them so they don't leak for the lifetime of the GL context.
    gl.detachShader(program, vertexShader);
    gl.detachShader(program, fragmentShader);
    gl.deleteShader(vertexShader);
    gl.deleteShader(fragmentShader);

    program.attributes = {
      position: gl.getAttribLocation(program, 'a_position'),
      texCoord: gl.getAttribLocation(program, 'a_texCoord')
    };

    program.uniforms = {};
    const uniformCount = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);
    for (let i = 0; i < uniformCount; i++) {
      const info = gl.getActiveUniform(program, i);
      program.uniforms[info.name] = gl.getUniformLocation(program, info.name);
    }

    return program;
  }

  _initPrograms() {
    this.programs.passthrough = this._createProgram(VERTEX_SHADER, PASSTHROUGH_FRAGMENT_SHADER);