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'''OpenGL extension ARB.direct_state_access
This module customises the behaviour of the
OpenGL.raw.GL.ARB.direct_state_access to provide a more
Python-friendly API
Overview (from the spec)
In unextended OpenGL, most mutation of state contained in objects is through
an indirection known as a binding. Objects are attached to a context (either
directly or indirectly via a container) and then commands to modify or
query their state are issued on that context, indirecting through its
attachments and into the underlying object. This is known as `bind-to-edit'.
This extension derives from the GL_EXT_direct_state_access extension, which
added accessors for most state on most objects, allowing it to be queried
and modified without the object needing to be bound to a context. In cases
where a single property of an object is to be modified, directly accessing
its state can be more efficient than binding the object to the context and
then indirecting through it. Further, directly accessing the state of
objects through their names rather than by bind-to-edit does not disturb
the bindings of the current context, which is useful for tools, middleware
and other applications that are unaware of the outer state but it can also
avoid cases of redundant state changes.
There are several subtle differences between this extension and the older
GL_EXT_direct_state_access extension. First, this extension only expands
functionality that still exists in core profile OpenGL. Second, any function
that only partially avoids bind-to-edit (for example, explicitly specifying
a texture unit, bypassing the active texture selector but still indirecting
through a texture binding) has been omitted. Finally, the original extension
effectively allowed any function to create new objects whereas in unextended
OpenGL, only binding functions created objects (bind-to-create), even if
their names were obtained through one of the glGen* functions. This
extension does not allow on-the-spot creation of objects. Rather than rely
on bind-to-create (which would defeat the purpose of the extension), we add
glCreate* functions that produce new names that represent state vectors
initialized to their default values. Due to this last change, several
functions no longer require their <target> parameters, and so where
applicable, this parameter is absent from this extension.
The official definition of this extension is available here:
http://www.opengl.org/registry/specs/ARB/direct_state_access.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.direct_state_access import *
from OpenGL.raw.GL.ARB.direct_state_access import _EXTENSION_NAME
def glInitDirectStateAccessARB():
'''Return boolean indicating whether this extension is available'''
from OpenGL import extensions
return extensions.hasGLExtension( _EXTENSION_NAME )
# INPUT glCreateTransformFeedbacks.ids size not checked against n
glCreateTransformFeedbacks=wrapper.wrapper(glCreateTransformFeedbacks).setInputArraySize(
'ids', None
)
# INPUT glCreateBuffers.buffers size not checked against n
glCreateBuffers=wrapper.wrapper(glCreateBuffers).setInputArraySize(
'buffers', None
)
# INPUT glNamedBufferStorage.data size not checked against size
glNamedBufferStorage=wrapper.wrapper(glNamedBufferStorage).setInputArraySize(
'data', None
)
# INPUT glNamedBufferSubData.data size not checked against 'size'
glNamedBufferSubData=wrapper.wrapper(glNamedBufferSubData).setInputArraySize(
'data', None
)
# INPUT glCreateFramebuffers.framebuffers size not checked against n
glCreateFramebuffers=wrapper.wrapper(glCreateFramebuffers).setInputArraySize(
'framebuffers', None
)
# INPUT glCreateRenderbuffers.renderbuffers size not checked against n
glCreateRenderbuffers=wrapper.wrapper(glCreateRenderbuffers).setInputArraySize(
'renderbuffers', None
)
# INPUT glCreateTextures.textures size not checked against n
glCreateTextures=wrapper.wrapper(glCreateTextures).setInputArraySize(
'textures', None
)
# INPUT glCreateVertexArrays.arrays size not checked against n
glCreateVertexArrays=wrapper.wrapper(glCreateVertexArrays).setInputArraySize(
'arrays', None
)
# INPUT glCreateSamplers.samplers size not checked against n
glCreateSamplers=wrapper.wrapper(glCreateSamplers).setInputArraySize(
'samplers', None
)
# INPUT glCreateProgramPipelines.pipelines size not checked against n
glCreateProgramPipelines=wrapper.wrapper(glCreateProgramPipelines).setInputArraySize(
'pipelines', None
)
# INPUT glCreateQueries.ids size not checked against n
glCreateQueries=wrapper.wrapper(glCreateQueries).setInputArraySize(
'ids', None
)
### END AUTOGENERATED SECTION
|
