glSampleCoverage â specify multisample coverage parameters
void glSampleCoverage( | GLclampf  | value, |
|  | GLboolean  | invert); |
value
+ Specify a single floating-point sample coverage value. The value is
+ clamped to the range
+
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.
+
+ 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. +
+ 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 © 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/. +