glProvokingVertex man page on Oracle
[printable version]
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 © 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 04/29/2014 GLPROVOKINGVERTEX(3G)
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