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glminsampleshading(3g) [centos man page]


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
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. AUTHORS 06/10/2014 GLMINSAMPLESHADING(3G)

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glGetMultisamplefv - retrieve the location of a sample C SPECIFICATION
void glGetMultisamplefv(GLenum pname, GLuint index, GLfloat *val); PARAMETERS
pname Specifies the sample parameter name. pname must be GL_SAMPLE_POSITION. index Specifies the index of the sample whose position to query. val Specifies the address of an array to receive the position of the sample. DESCRIPTION
glGetMultisamplefv queries the location of a given sample. pname specifies the sample parameter to retrieve and must be GL_SAMPLE_POSITION. index corresponds to the sample for which the location should be returned. The sample location is returned as two floating-point values in val[0] and val[1], each between 0 and 1, corresponding to the x and y locations respectively in the GL pixel space of that sample. (0.5, 0.5) this corresponds to the pixel center. index must be between zero and the value of GL_SAMPLES - 1. If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples within some pixels. ERRORS
GL_INVALID_ENUM is generated if pname is not one GL_SAMPLE_POSITION. GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_SAMPLES. SEE ALSO
glGenFramebuffers(), glBindFramebuffer() COPYRIGHT
Copyright (C) 2010 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. OpenGL 3.3 03/08/2011 GLGETMULTISAMPLEFV(3G)
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