glCreateProgram creates an empty program object and returns a non-zero value by which it can be referenced. A program object is an object to which shader objects can be attached. This provides a mechanism to specify the shader objects that will be linked to create a program. It also provides a means for checking the compatibility of the shaders that will be used to create a program (for instance, checking the compatibility between a vertex shader and a fragment shader). When no longer needed as part of a program object, shader objects can be detached.
One or more executables are created in a program object by these actions: successfully attaching shader objects to the program object with glAttachShader, successfully compiling the shader objects with glCompileShader, and successfully linking the program object with glLinkProgram. These executables are made part of current state when glUseProgram is called. Program objects can be deleted with glDeleteProgram. The memory associated with the program object is deleted when it is no longer part of current rendering state for any context.
glCreateProgram is available only if the GL version is 2.0 or greater.
Like display lists and texture objects, the name space for program objects may be shared across a set of contexts, as long as the server sides of the contexts share the same address space. If the name space is shared across contexts, any attached objects and the data associated with those attached objects are shared as well.
Applications are responsible for synchronizing across API calls when objects are accessed from different execution threads.
This function returns 0 if an error occurs creating the program object.
GL_INVALID_OPERATION is generated if glCreateProgram is executed between the execution of glBegin and the corresponding execution of glEnd.
glGet with the argument GL_CURRENT_PROGRAM
glGetActiveAttrib with a valid program object and the index of an active attribute variable
glGetActiveUniform with a valid program object and the index of an active uniform variable
glGetAttachedShaders with a valid program object
glGetAttribLocation with a valid program object and the name of an attribute variable
glGetProgram with a valid program object and the parameter to be queried
glGetProgramInfoLog with a valid program object
glGetUniform with a valid program object and the location of a uniform variable
glGetUniformLocation with a valid program object and the name of a uniform variable
glAttachShader, glBindAttribLocation, glCreateShader, glDeleteProgram, glDetachShader, glLinkProgram, glUniform, glUseProgram, glValidateProgram