GLSHADEMODEL(3G)GLSHADEMODEL(3G)NAME
glShadeModel - select flat or smooth shading
C SPECIFICATION
void glShadeModel( GLenum mode )
PARAMETERS
mode Specifies a symbolic value representing a shading technique. Accepted values are GL_FLAT and GL_SMOOTH. The initial value is
GL_SMOOTH.
DESCRIPTION
GL primitives can have either flat or smooth shading. Smooth shading, the default, causes the computed colors of vertices to be interpo-
lated as the primitive is rasterized, typically assigning different colors to each resulting pixel fragment. Flat shading selects the com-
puted color of just one vertex and assigns it to all the pixel fragments generated by rasterizing a single primitive. In either case, the
computed color of a vertex is the result of lighting if lighting is enabled, or it is the current color at the time the vertex was speci-
fied if lighting is disabled.
Flat and smooth shading are indistinguishable for points. Starting when glBegin is issued and counting vertices and primitives from 1, the
GL gives each flat-shaded line segment i the computed color of vertex i + 1, its second vertex. Counting similarly from 1, the GL gives
each flat-shaded polygon the computed color of the vertex listed in the following table. This is the last vertex to specify the polygon in
all cases except single polygons, where the first vertex specifies the flat-shaded color.
Primitive Type of Polygon i Vertex
Single polygon ( i == 1) 1
Triangle strip i + 2
Triangle fan i + 2
Independent triangle 3i
Quad strip 2i + 2
Independent quad 4i
Flat and smooth shading are specified by glShadeModel with mode set to GL_FLAT and GL_SMOOTH, respectively.
ERRORS
GL_INVALID_ENUM is generated if mode is any value other than GL_FLAT or GL_SMOOTH.
GL_INVALID_OPERATION is generated if glShadeModel is executed between the execution of glBegin and the corresponding execution of glEnd.
ASSOCIATED GETS
glGet with argument GL_SHADE_MODEL
SEE ALSO
glBegin, glColor, glLight, glLightModel
GLSHADEMODEL(3G)
Check Out this Related Man Page
GLPROVOKINGVERTEX(3G) [FIXME: 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/.
[FIXME: source] 05/30/2012 GLPROVOKINGVERTEX(3G)
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