Select distinct values from a flat file

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glprovokingvertex

GLPROVOKINGVERTEX(3G)						   OpenGL Manual					     GLPROVOKINGVERTEX(3G)

NAME

       glProvokingVertex - specifiy the vertex to be used as the source of data for flat shaded varyings

C SPECIFICATION

       void glProvokingVertex(GLenum provokeMode);

PARAMETERS

       provokeMode
	   Specifies the vertex to be used as the source of data for flat shaded varyings.

DESCRIPTION

       Flatshading a vertex shader varying output means to assign all vetices of the primitive the same value for that output. The vertex from
       which these values is derived is known as the provoking vertex and glProvokingVertex specifies which vertex is to be used as the source of
       data for flat shaded varyings.

       provokeMode must be either GL_FIRST_VERTEX_CONVENTION or GL_LAST_VERTEX_CONVENTION, and controls the selection of the vertex whose values
       are assigned to flatshaded varying outputs. The interpretation of these values for the supported primitive types is:

       If a vertex or geometry shader is active, user-defined varying outputs may be flatshaded by using the flat qualifier when declaring the
       output.

NOTES

       glProvokingVertex is available only if the GL version is 3.2 or greater.

ERRORS

       GL_INVALID_ENUM is generated if provokeMode is not an accepted value.

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org

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

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