04-23-2009
Homework?
For the first, look into character classes and how to invert them.
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LEARN ABOUT DEBIAN
glsamplecoverage
GLSAMPLECOVERAGE(3G) [FIXME: 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 (C) 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/.
[FIXME: source] 05/30/2012 GLSAMPLECOVERAGE(3G)