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'''OpenGL extension ARB.shader_viewport_layer_array
This module customises the behaviour of the
OpenGL.raw.GL.ARB.shader_viewport_layer_array to provide a more
Python-friendly API
Overview (from the spec)
The gl_ViewportIndex and gl_Layer built-in variables were introduced by
the in OpenGL 4.1. These variables are available in un-extended OpenGL
only to the geometry shader. When written in the geometry shader, they
cause geometry to be directed to one of an array of several independent
viewport rectangles or framebuffer attachment layers, respectively.
In order to use any viewport or attachment layer other than zero, a
geometry shader must be present. Geometry shaders introduce processing
overhead and potential performance issues. The AMD_vertex_shader_layer
and AMD_vertex_shader_viewport_index extensions allowed the gl_Layer
and gl_ViewportIndex outputs to be written directly from the vertex shader
with no geometry shader present.
This extension effectively merges the AMD_vertex_shader_layer and
AMD_vertex_shader_viewport_index extensions together and extends them further
to allow both outputs to be written from tessellation evaluation shaders.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/ARB/shader_viewport_layer_array.txt
'''
from OpenGL import platform, constant, arrays
from OpenGL import extensions, wrapper
import ctypes
from OpenGL.raw.GL import _types, _glgets
from OpenGL.raw.GL.ARB.shader_viewport_layer_array import *
from OpenGL.raw.GL.ARB.shader_viewport_layer_array import _EXTENSION_NAME
def glInitShaderViewportLayerArrayARB():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
### END AUTOGENERATED SECTION
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