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glsamplecoverage(3g) [osx man page]

GLSAMPLECOVERAGE(3G)						    OpenGL 3.3						      GLSAMPLECOVERAGE(3G)

NAME
glSampleCoverage - specify multisample coverage parameters C SPECIFICATION
void glSampleCoverage(GLclampf 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. 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() 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/. OpenGL 3.3 03/08/2011 GLSAMPLECOVERAGE(3G)

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GLLINEWIDTH(3G) 						  [FIXME: manual]						   GLLINEWIDTH(3G)

NAME
glLineWidth - specify the width of rasterized lines C SPECIFICATION
void glLineWidth(GLfloat width); PARAMETERS
width Specifies the width of rasterized lines. The initial value is 1. DESCRIPTION
glLineWidth specifies the rasterized width of both aliased and antialiased lines. Using a line width other than 1 has different effects, depending on whether line antialiasing is enabled. To enable and disable line antialiasing, call glEnable() and glDisable() with argument GL_LINE_SMOOTH. Line antialiasing is initially disabled. If line antialiasing is disabled, the actual width is determined by rounding the supplied width to the nearest integer. (If the rounding results in the value 0, it is as if the line width were 1.) If / x >= / y, i pixels are filled in each column that is rasterized, where i is the rounded value of width. Otherwise, i pixels are filled in each row that is rasterized. If antialiasing is enabled, line rasterization produces a fragment for each pixel square that intersects the region lying within the rectangle having width equal to the current line width, length equal to the actual length of the line, and centered on the mathematical line segment. The coverage value for each fragment is the window coordinate area of the intersection of the rectangular region with the corresponding pixel square. This value is saved and used in the final rasterization step. Not all widths can be supported when line antialiasing is enabled. If an unsupported width is requested, the nearest supported width is used. Only width 1 is guaranteed to be supported; others depend on the implementation. Likewise, there is a range for aliased line widths as well. To query the range of supported widths and the size difference between supported widths within the range, call glGet() with arguments GL_ALIASED_LINE_WIDTH_RANGE, GL_SMOOTH_LINE_WIDTH_RANGE, and GL_SMOOTH_LINE_WIDTH_GRANULARITY. NOTES
The line width specified by glLineWidth is always returned when GL_LINE_WIDTH is queried. Clamping and rounding for aliased and antialiased lines have no effect on the specified value. Nonantialiased line width may be clamped to an implementation-dependent maximum. Call glGet() with GL_ALIASED_LINE_WIDTH_RANGE to determine the maximum width. In OpenGL 1.2, the tokens GL_LINE_WIDTH_RANGE and GL_LINE_WIDTH_GRANULARITY were replaced by GL_ALIASED_LINE_WIDTH_RANGE, GL_SMOOTH_LINE_WIDTH_RANGE, and GL_SMOOTH_LINE_WIDTH_GRANULARITY. The old names are retained for backward compatibility, but should not be used in new code. ERRORS
GL_INVALID_VALUE is generated if width is less than or equal to 0. ASSOCIATED GETS
glGet() with argument GL_LINE_WIDTH glGet() with argument GL_ALIASED_LINE_WIDTH_RANGE glGet() with argument GL_SMOOTH_LINE_WIDTH_RANGE glGet() with argument GL_SMOOTH_LINE_WIDTH_GRANULARITY glIsEnabled() with argument GL_LINE_SMOOTH SEE ALSO
glEnable() 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 GLLINEWIDTH(3G)
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