Snipplet from: engine.cpp

// ...
Result<GLuint> scr = compile_shader( false, vertexSource );
if( scr.is_failure() ) {
  printf("Engine: Vertex shader failed to compile:\n%s", scr.failure() );
  exit( 1 );
}
vertexShader = scr.success();

scr = compile_shader( true, fragSource );
if( scr.is_failure() ) {
  printf("Engine: Frag shader failed to compile:\n%s", scr.failure() );
  exit( 1 );
}
fragShader = scr.success();

program = glCreateProgram();
if( !program ) {
  printf("Engine: Failed to create program\n" );
  exit( 1 );
}

glAttachShader( program, vertexShader );
glAttachShader( program, fragShader );
glBindFragDataLocation( program, 0, "outColour" );
glLinkProgram( program );
glUseProgram( program );

GLint posAttrib = glGetAttribLocation( program, "position" );
glEnableVertexAttribArray( posAttrib );
glVertexAttribPointer( posAttrib, 3, GL_FLOAT, GL_FALSE
                     , 5 * sizeof( float )
                     , 0 );

GLint texAttrib = glGetAttribLocation( program, "texcoord" );
glEnableVertexAttribArray( texAttrib );
glVertexAttribPointer( texAttrib, 2, GL_FLOAT, GL_FALSE
                     , 5 * sizeof( float )
                     , (void*)( 3 * sizeof( float ) ) );

uniTime = glGetUniformLocation( program, "time" );
uniModel = glGetUniformLocation( program, "view" );
uniModel = glGetUniformLocation( program, "model" );
uniModel = glGetUniformLocation( program, "proj" );
// ...