glSampleCoverage man page on Oracle
[printable version]
GLSAMPLECOVERAGE(3G) OpenGL Manual GLSAMPLECOVERAGE(3G)
NAME
glSampleCoverage - specify multisample coverage parameters
C SPECIFICATION
void glSampleCoverage(GLfloat value, GLboolean invert);
PARAMETERS
value
Specify a single floating-point sample coverage value. The value is
clamped to the range 0 1. The initial value is 1.0.
invert
Specify a single boolean value representing if the coverage masks
should be inverted. GL_TRUE and GL_FALSE are accepted. The initial
value is GL_FALSE.
DESCRIPTION
Multisampling samples a pixel multiple times at various
implementation-dependent subpixel locations to generate antialiasing
effects. Multisampling transparently antialiases points, lines,
polygons, and images if it is enabled.
value is used in constructing a temporary mask used in determining
which samples will be used in resolving the final fragment color. This
mask is bitwise-anded with the coverage mask generated from the
multisampling computation. If the invert flag is set, the temporary
mask is inverted (all bits flipped) and then the bitwise-and is
computed.
If an implementation does not have any multisample buffers available,
or multisampling is disabled, rasterization occurs with only a single
sample computing a pixel's final RGB color.
Provided an implementation supports multisample buffers, and
multisampling is enabled, then a pixel's final color is generated by
combining several samples per pixel. Each sample contains color, depth,
and stencil information, allowing those operations to be performed on
each sample.
NOTES
The type of the value parameter was changed from GLclampf to GLfloat.
This change is transparent to user code and is described in detail on
the removedTypes() page.
ASSOCIATED GETS
glGet() with argument GL_SAMPLE_COVERAGE_VALUE
glGet() with argument GL_SAMPLE_COVERAGE_INVERT
glIsEnabled() with argument GL_MULTISAMPLE
glIsEnabled() with argument GL_SAMPLE_ALPHA_TO_COVERAGE
glIsEnabled() with argument GL_SAMPLE_ALPHA_TO_ONE
glIsEnabled() with argument GL_SAMPLE_COVERAGE
SEE ALSO
glEnable(), removedTypes()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLSAMPLECOVERAGE(3G)
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