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'''OpenGL extension EXT.blend_func_extended
This module customises the behaviour of the
OpenGL.raw.GLES2.EXT.blend_func_extended to provide a more
Python-friendly API
Overview (from the spec)
This extension provides an ES version of the ARB_blend_func_extended
functionality.
Traditional OpenGL includes fixed-function blending that combines
source colors with the existing content of a render buffer in
a variety of ways. A number of extensions have enhanced this
functionality by adding further sources of blending weights and
methods to combine them. However, the inputs to the fixed-function
blending units are constrained to a source color (as output from
fragment shading), destination color (as the current content of the
frame buffer) or constants that may be used in their place.
This extension adds new blending functions whereby a fragment
shader may output two colors, one of which is treated as the
source color, and the other used as a blending factor for either
source or destination colors. Furthermore, this extension increases
orthogonality by allowing the SRC_ALPHA_SATURATE function to be used
as the destination weight.
Because of the limitations of the OpenGL ES 2.0 shading language,
new built-in variables (gl_SecondaryFragColorEXT,
gl_SecondaryFragDataEXT) are added to the ES 1.00 shading language
rather than introduce more complex features for user-defined fragment
outputs. Because such built-in variable are deprecated in ES 3.0,
these variables are NOT available in the OpenGL ES 3.xx shading
language verisons.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/blend_func_extended.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.blend_func_extended import *
from OpenGL.raw.GLES2.EXT.blend_func_extended import _EXTENSION_NAME
def glInitBlendFuncExtendedEXT():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
# INPUT glBindFragDataLocationEXT.name size not checked against 'name'
glBindFragDataLocationEXT=wrapper.wrapper(glBindFragDataLocationEXT).setInputArraySize(
'name', None
)
# INPUT glGetProgramResourceLocationIndexEXT.name size not checked against 'name'
glGetProgramResourceLocationIndexEXT=wrapper.wrapper(glGetProgramResourceLocationIndexEXT).setInputArraySize(
'name', None
)
### END AUTOGENERATED SECTION
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