Deletes a program object
Specifies the program object to be deleted.
glDeleteProgram frees the memory and invalidates the name associated with the program object specified by program. This command effectively undoes the effects of a call to glCreateProgram .
If a program object is in use as part of current rendering state, it will be flagged for deletion, but it will not be deleted until it is no longer part of current state for any rendering context. If a program object to be deleted has shader objects attached to it, those shader objects will be automatically detached but not deleted unless they have already been flagged for deletion by a previous call to glDeleteShader . A value of 0 for program will be silently ignored.
GL_INVALID_VALUE is generated if program is not a value generated by OpenGL.
glGet with argument GL_CURRENT_PROGRAM
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