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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			  03/16/2013		  GLSAMPLECOVERAGE(3G)

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