GLMINSAMPLESHADING(3G) OpenGL Manual GLMINSAMPLESHADING(3G)NAME
glMinSampleShading - specifies minimum rate at which sample shaing takes place
C SPECIFICATION
void glMinSampleShading(GLfloat value);
PARAMETERS
value
Specifies the rate at which samples are shaded within each covered pixel.
DESCRIPTION
glMinSampleShading specifies the rate at which samples are shaded within a covered pixel. Sample-rate shading is enabled by calling
glEnable() with the parameter GL_SAMPLE_SHADING. If GL_MULTISAMPLE or GL_SAMPLE_SHADING is disabled, sample shading has no effect.
Otherwise, an implementation must provide at least as many unique color values for each covered fragment as specified by value times
samples where samples is the value of GL_SAMPLES for the current framebuffer. At least 1 sample for each covered fragment is generated.
A value of 1.0 indicates that each sample in the framebuffer should be indpendently shaded. A value of 0.0 effectively allows the GL to
ignore sample rate shading. Any value between 0.0 and 1.0 allows the GL to shade only a subset of the total samples within each covered
fragment. Which samples are shaded and the algorithm used to select that subset of the fragment's samples is implementation dependent.
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.
ERRORS
None.
ASSOCIATED GETS
glGet() with argument GL_MIN_SAMPLE_SHADING.
glGet() with argument GL_SAMPLES.
SEE ALSO
removedTypes()
COPYRIGHT
Copyright (C) 2011 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.
AUTHORS
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opengl.org 06/10/2014 GLMINSAMPLESHADING(3G)
Check Out this Related Man Page
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 (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/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLSAMPLECOVERAGE(3G)