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'''OpenGL extension EXT.shader_samples_identical
This module customises the behaviour of the
OpenGL.raw.GLES2.EXT.shader_samples_identical to provide a more
Python-friendly API
Overview (from the spec)
Multisampled antialiasing has become a common method for improving the
quality of rendered images. Multisampling differs from supersampling in
that the color of a primitive that covers all or part of a pixel is
resolved once, regardless of the number of samples covered. If a large
polygon is rendered, the colors of all samples in each interior pixel will
be the same. This suggests a simple compression scheme that can reduce
the necessary memory bandwidth requirements. In one such scheme, each
sample is stored in a separate slice of the multisample surface. An
additional multisample control surface (MCS) contains a mapping from pixel
samples to slices.
If all the values stored in the MCS for a particular pixel are the same,
then all the samples have the same value. Applications can take advantage
of this information to reduce the bandwidth of reading multisample
textures. A custom multisample resolve filter could optimize resolving
pixels where every sample is identical by reading the color once.
color = texelFetch(sampler, coordinate, 0);
if (!textureSamplesIdenticalEXT(sampler, coordinate)) {
for (int i = 1; i < MAX_SAMPLES; i++) {
vec4 c = texelFetch(sampler, coordinate, i);
//... accumulate c into color
}
}
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/shader_samples_identical.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GLES2 import _types, _glgets
from OpenGL.raw.GLES2.EXT.shader_samples_identical import *
from OpenGL.raw.GLES2.EXT.shader_samples_identical import _EXTENSION_NAME
def glInitShaderSamplesIdenticalEXT():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
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