Method _createProgram

packages/core/src/shader/ShaderProgram.ts:240–280

* Init and link program with shader.

(vertexSource: string, fragmentSource: string)

   * Init and link program with shader.
   */
  private _createProgram(vertexSource: string, fragmentSource: string): WebGLProgram | null {
    const gl = this._gl;

    // Create and compile shader
    const vertexShader = this._createShader(gl.VERTEX_SHADER, vertexSource);
    if (!vertexShader) {
      return null;
    }

    const fragmentShader = this._createShader(gl.FRAGMENT_SHADER, fragmentSource);
    if (!fragmentShader) {
      return null;
    }

    // Create program and link shader
    const program = gl.createProgram();
    if (!program) {
      return null;
    }

    gl.attachShader(program, vertexShader);
    gl.attachShader(program, fragmentShader);
    gl.linkProgram(program);
    gl.validateProgram(program);

    gl.deleteShader(vertexShader);
    gl.deleteShader(fragmentShader);

    if (Logger.isEnabled && !gl.getProgramParameter(program, gl.LINK_STATUS) && !gl.isContextLost()) {
      Logger.error(
        `Could not link WebGL program\n\n` +
          `Shader error: ${gl.getError()}\n\n` +
          `Validate status: ${gl.getProgramParameter(program, gl.VALIDATE_STATUS)}\n\n` +
          `Program information log: ${gl.getProgramInfoLog(program)}`
      );
      gl.deleteProgram(program);
      return null;
    }

    return program;
  }

  private _createShader(shaderType: number, shaderSource: string): WebGLShader | null {
    const gl = this._gl;