PS_SHFILL(3) Library Functions Manual PS_SHFILL(3)NAME
PS_shfill -- Draws a shading
SYNOPSIS
#include <pslib.h>
void PS_shfill(PSDoc *psdoc, int shading)
DESCRIPTION
Draws the shading whose id is passed in parameter shading. The name of the function is somewhat misleading. It does not fill an area like
PS_fill(3) but simply draws the shading without any bounding box. If you want to restrict the schading to a certain area, then
you will have to call PS_clip(3) before.
Using PS_shfill(3) is often easier than creating a shading pattern with PS_shading_pattern(3)and using it for filling.
SEE ALSO PS_shading(3), PS_shading_pattern(3), PS_clip(3)AUTHOR
This manual page was written by Uwe Steinmann uwe@steinmann.cx.
PS_SHFILL(3)
Check Out this Related Man Page
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)
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