Function getWebGLUniformMetadata

src/webgl/utils.js:331–376

(shader, gl)

}

export function getWebGLUniformMetadata(shader, gl) {
  const program = shader._glProgram;

  const numUniforms = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);
  const result = [];

  let samplerIndex = 0;

  for (let i = 0; i < numUniforms; ++i) {
    const uniformInfo = gl.getActiveUniform(program, i);
    const uniform = {};
    uniform.location = gl.getUniformLocation(program, uniformInfo.name);
    uniform.size = uniformInfo.size;
    let uniformName = uniformInfo.name;
    //uniforms that are arrays have their name returned as
    //someUniform[0] which is a bit silly so we trim it
    //off here. The size property tells us that its an array
    //so we dont lose any information by doing this
    if (uniformInfo.size > 1) {
      uniformName = uniformName.substring(0, uniformName.indexOf("[0]"));
    }
    uniform.name = uniformName;
    uniform.type = uniformInfo.type;
    uniform._cachedData = undefined;
    if (uniform.type === gl.SAMPLER_2D) {
      uniform.isSampler = true;
      uniform.samplerIndex = samplerIndex;
      samplerIndex++;
    }

    uniform.isArray =
      uniformInfo.size > 1 ||
      uniform.type === gl.FLOAT_MAT3 ||
      uniform.type === gl.FLOAT_MAT4 ||
      uniform.type === gl.FLOAT_VEC2 ||
      uniform.type === gl.FLOAT_VEC3 ||
      uniform.type === gl.FLOAT_VEC4 ||
      uniform.type === gl.INT_VEC2 ||
      uniform.type === gl.INT_VEC4 ||
      uniform.type === gl.INT_VEC3;

    result.push(uniform);
  }

  return result;
}

export function getWebGLShaderAttributes(shader, gl) {
  const attributes = {};