glPolygonOffsetClamp — set the scale, units and clamp used to calculate depth values
void glPolygonOffsetClamp(
|
GLfloat factor, |
| GLfloat units, | |
GLfloat clamp); |
factor
Specifies a scale factor that is used to create a variable depth offset for each polygon. The initial value is 0.
units
Is multiplied by an implementation-specific value to create a constant depth offset. The initial value is 0.
clamp
Used to set a maximum or minimum value for the offset calculation.
When GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or
GL_POLYGON_OFFSET_POINT is enabled, each
fragment's depth value will be offset after it is interpolated
from the depth values of the appropriate vertices.
The offset is calculated as follows:
glPolygonOffsetClamp is useful for rendering hidden-line images, for applying decals
to surfaces, and for rendering solids with highlighted edges.
glIsEnabled with argument
GL_POLYGON_OFFSET_FILL,
GL_POLYGON_OFFSET_LINE,
or GL_POLYGON_OFFSET_POINT.
glGet with argument GL_POLYGON_OFFSET_FACTOR,
GL_POLYGON_OFFSET_UNITS or POLYGON_OFFSET_CLAMP.
| OpenGL Version | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 | 4.6 |
glPolygonOffsetClamp
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