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CentOS 7.0 - man page for glvalidateprogram (centos section 3G)

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       glValidateProgram - Validates a program object

       void glValidateProgram(GLuint program);

	   Specifies the handle of the program object to be validated.

       glValidateProgram checks to see whether the executables contained in program can execute
       given the current OpenGL state. The information generated by the validation process will
       be stored in program's information log. The validation information may consist of an empty
       string, or it may be a string containing information about how the current program object
       interacts with the rest of current OpenGL state. This provides a way for OpenGL
       implementers to convey more information about why the current program is inefficient,
       suboptimal, failing to execute, and so on.

       The status of the validation operation will be stored as part of the program object's
       state. This value will be set to GL_TRUE if the validation succeeded, and GL_FALSE
       otherwise. It can be queried by calling glGetProgram() with arguments program and
       GL_VALIDATE_STATUS. If validation is successful, program is guaranteed to execute given
       the current state. Otherwise, program is guaranteed to not execute.

       This function is typically useful only during application development. The informational
       string stored in the information log is completely implementation dependent; therefore, an
       application should not expect different OpenGL implementations to produce identical
       information strings.

       This function mimics the validation operation that OpenGL implementations must perform
       when rendering commands are issued while programmable shaders are part of current state.
       The error GL_INVALID_OPERATION will be generated by any command that triggers the
       rendering of geometry if:

       o   any two active samplers in the current program object are of different types, but
	   refer to the same texture image unit,

       o   the number of active samplers in the program exceeds the maximum number of texture
	   image units allowed.

       It may be difficult or cause a performance degradation for applications to catch these
       errors when rendering commands are issued. Therefore, applications are advised to make
       calls to glValidateProgram to detect these issues during application development.

       GL_INVALID_VALUE is generated if program is not a value generated by OpenGL.

       GL_INVALID_OPERATION is generated if program is not a program object.

       glGetProgram() with arguments program and GL_VALIDATE_STATUS

       glGetProgramInfoLog() with argument program


       glLinkProgram(), glUseProgram()

       Copyright (C) 2003-2005 3Dlabs Inc. Ltd. This material may be distributed subject to the
       terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.


opengl.org				    06/10/2014			    GLVALIDATEPROGRAM(3G)
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