10. Compiling a shader program example

• These functions are invoked during main initialization:

  
  GLuint makeVertexShader(const char* shaderSource)
  {
      GLuint vertexShaderID = glCreateShader( GL_VERTEX_SHADER );
      glShaderSource( vertexShaderID, 1, (const GLchar**)&shaderSource, NULL );
      glCompileShader( vertexShaderID );
      return vertexShaderID;
  }
  
  GLuint makeFragmentShader(const char* shaderSource)
  {
      GLuint fragmentShaderID = glCreateShader( GL_FRAGMENT_SHADER );
      glShaderSource( fragmentShaderID, 1, (const GLchar**)&shaderSource, NULL );
      glCompileShader( fragmentShaderID );
      return fragmentShaderID;
  }
  
  GLuint makeShaderProgram (GLuint vertexShaderID, GLuint fragmentShaderID)
  {
      GLuint shaderProgramID = glCreateProgram();
      glAttachShader( shaderProgramID, vertexShaderID );
      glAttachShader( shaderProgramID, fragmentShaderID );
      glLinkProgram( shaderProgramID );
      return shaderProgramID;
  }
  
  

• When rendering (or any time you want to activate the program), call

  
  	glUseProgram( shaderProgramID );