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GLSAMPLECOVERAGE(3G) OpenGL Manual GLSAMPLECOVERAGE(3G)
glSampleCoverage - specify multisample coverage parameters
void glSampleCoverage(GLfloat value, GLboolean invert);
Specify a single floating-point sample coverage value. The value is clamped to the
range 0 1. The initial value is 1.0.
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.
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
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.
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.
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
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/.
opengl.org 06/10/2014 GLSAMPLECOVERAGE(3G)
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