OpenGL 4 Shading Language Cookbook - Third Edition

How to do it...

In our OpenGL initialization function, and after the compilation of shader objects referred to by vertShader and fragShader, perform the following steps:

1. Create the program object using the following code:

GLuint programHandle = glCreateProgram(); 
if( 0 == programHandle ) 
{ 
  std::cerr << "Error creating program object." << std::endl; 
  exit(EXIT_FAILURE); 
} 

2. Attach the shaders to the program object as follows:

glAttachShader( programHandle, vertShader ); 
glAttachShader( programHandle, fragShader ); 

3. Link the program:

glLinkProgram( programHandle );

4. Verify the link status:

GLint status; glGetProgramiv( programHandle, GL_LINK_STATUS, &status ); if( GL_FALSE == status ) { std::cerr << "Failed to link shader program!" << ...