Shaders and Programs - Praise for OpenGL ES 30 Programming Guide - page 79

Example 4-2 Create, Attach Shaders to, and Link a Program

// Create the program object
programObject = glCreateProgram ( );

if ( programObject == 0 )
{
return 0;
}

glAttachShader ( programObject, vertexShader );
glAttachShader ( programObject, fragmentShader );

// Link the program
glLinkProgram ( programObject );

// Check the link status
glGetProgramiv ( programObject, GL_LINK_STATUS, &linked );

if ( !linked )
{
// Retrieve compiler error messages when linking fails
GLint infoLen = 0;

glGetProgramiv( programObject, GL_INFO_LOG_LENGTH, &infoLen);

if ( infoLen > 1 )
{
char* infoLog = malloc ( sizeof ( char ) * infoLen );

glGetProgramInfoLog ( programObject, infoLen, NULL,
infoLog );
esLogMessage ( “Error linking program:\n%s\n”, infoLog );

free ( infoLog );
}

glDeleteProgram ( programObject );
return FALSE;
}

// ...

// Use the program object
glUseProgram ( programObject );