createUniformSetters static method

dynamic createUniformSetters(OpenGLContextES gl, int program)

Creates uniform setters.

• gl the OpenGlES context.
• program the program id

Implementation

static createUniformSetters(OpenGLContextES gl, int program) {
  var textureUnit = 0;

  createUniformSetter(int program, ActiveInfo uniformInfo) {
    int location = gl.getUniformLocation(program, uniformInfo.name);
    bool isArray = uniformInfo.size > 1 &&
        uniformInfo.name.substring(uniformInfo.name.length - 3, uniformInfo.name.length) == "[0]";
    int type = uniformInfo.type;
    var typeInfo = flutter3DUtils.typeMap[type];
    if (typeInfo == null) {
      throw "unknown type: 0x" + type.toString(); // we should never get here.
    }
    if (typeInfo['bindPoint'] != null) {
      // it's a sampler
      var unit = textureUnit;
      textureUnit += uniformInfo.size;

      if (isArray) {
        return typeInfo['arraySetter'](gl, type, unit, location, uniformInfo.size);
      } else {
        return typeInfo['setter'](gl, type, unit, location, uniformInfo.size);
      }
    } else {
      if (typeInfo['arraySetter'] != null && isArray) {
        return typeInfo['arraySetter'](gl, location);
      } else {
        return typeInfo['setter'](gl, location);
      }
    }
  }

  Map<String, dynamic> uniformSetters = {};
  int numUniforms = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);

  for (var ii = 0; ii < numUniforms; ++ii) {
    ActiveInfo uniformInfo = gl.getActiveUniform(program, ii); // or use ActiveInfo
    if (uniformInfo == null) {
      break;
    }
    var name = uniformInfo.name;
    // remove the array suffix.
    if (name.substring(name.length - 3, name.length) == "[0]") {
      name = name.substring(0, name.length - 3);
    }
    var setter = createUniformSetter(program, uniformInfo);
    uniformSetters[name] = setter;
  }
  return uniformSetters;
}