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"""Extension module support methods
This module provides the tools required to check whether
an extension is available
"""
from OpenGL.latebind import LateBind
from OpenGL._bytes import bytes,unicode,as_8_bit
import OpenGL as root
import sys
import logging
_log = logging.getLogger( 'OpenGL.extensions' )
VERSION_PREFIX = as_8_bit('GL_VERSION_GL_')
CURRENT_GL_VERSION = None
AVAILABLE_GL_EXTENSIONS = []
AVAILABLE_GLU_EXTENSIONS = []
# version tuple -> list of implicitly included extensions...
VERSION_EXTENSIONS = [
((3,0), [
as_8_bit('GL_ARB_vertex_array_object'),
as_8_bit('GL_ARB_texture_buffer_object'),
as_8_bit('GL_ARB_framebuffer_object'),
as_8_bit('GL_ARB_map_buffer_range'),
]),
((3,1), [
as_8_bit('GL_ARB_copy_buffer'),
as_8_bit('GL_ARB_uniform_buffer_object'),
]),
((3,2), [
as_8_bit('GL_ARB_draw_elements_base_vertex'),
as_8_bit('GL_ARB_provoking_vertex'),
as_8_bit('GL_ARB_sync'),
as_8_bit('GL_ARB_texture_multisample'),
]),
((3,3), [
as_8_bit('GL_ARB_texture_multisample'),
as_8_bit('GL_ARB_blend_func_extended'),
as_8_bit('GL_ARB_sampler_objects'),
as_8_bit('GL_ARB_explicit_attrib_location'),
as_8_bit('GL_ARB_occlusion_query2'),
as_8_bit('GL_ARB_shader_bit_encoding'),
as_8_bit('GL_ARB_texture_rgb10_a2ui'),
as_8_bit('GL_ARB_texture_swizzle'),
as_8_bit('GL_ARB_timer_query'),
as_8_bit('GL_ARB_vertex_type_2_10_10_10_rev'),
]),
((4,0), [
as_8_bit('GL_ARB_texture_query_lod'),
as_8_bit('GL_ARB_draw_indirect'),
as_8_bit('GL_ARB_gpu_shader5'),
as_8_bit('GL_ARB_gpu_shader_fp64'),
as_8_bit('GL_ARB_shader_subroutine'),
as_8_bit('GL_ARB_tessellation_shader'),
as_8_bit('GL_ARB_texture_buffer_object_rgb32'),
as_8_bit('GL_ARB_texture_cube_map_array'),
as_8_bit('GL_ARB_texture_gather'),
as_8_bit('GL_ARB_transform_feedback2'),
as_8_bit('GL_ARB_transform_feedback3'),
]),
((4,1), [
as_8_bit('GL_ARB_ES2_compatibility'),
as_8_bit('GL_ARB_get_program_binary'),
as_8_bit('GL_ARB_separate_shader_objects'),
as_8_bit('GL_ARB_shader_precision'),
as_8_bit('GL_ARB_vertex_attrib_64bit'),
as_8_bit('GL_ARB_viewport_array'),
]),
((4,2), [
as_8_bit('GL_ARB_base_instance'),
as_8_bit('GL_ARB_shading_language_420pack'),
as_8_bit('GL_ARB_transform_feedback_instanced'),
as_8_bit('GL_ARB_compressed_texture_pixel_storage'),
as_8_bit('GL_ARB_conservative_depth'),
as_8_bit('GL_ARB_internalformat_query'),
as_8_bit('GL_ARB_map_buffer_alignment'),
as_8_bit('GL_ARB_shader_atomic_counters'),
as_8_bit('GL_ARB_shader_image_load_store'),
as_8_bit('GL_ARB_shading_language_packing'),
as_8_bit('GL_ARB_texture_storage'),
]),
]
class ExtensionQuerier( object ):
prefix = None
version_prefix = None
assumed_version = [1,0]
version = extensions = None
version_string = extensions_string = None
registered = []
def __init__( self ):
self.registered.append( self )
@classmethod
def hasExtension( self, specifier ):
for registered in self.registered:
result = registered( specifier )
if result:
return result
return False
def __call__( self, specifier ):
specifier = as_8_bit(specifier).replace(as_8_bit('.'),as_8_bit('_'))
if not specifier.startswith( as_8_bit(self.prefix) ):
return None
if specifier.startswith( as_8_bit(self.version_prefix) ):
specifier = [
int(x)
for x in specifier[ len(self.version_prefix):].split(as_8_bit('_'))
]
if specifier[:2] <= self.assumed_version:
return True
version = self.getVersion()
if not version:
return version
return specifier <= version
else:
extensions = self.getExtensions()
return extensions and specifier in extensions
def getVersion( self ):
if not self.version:
self.version = self.pullVersion()
return self.version
def getExtensions( self ):
if not self.extensions:
self.extensions = self.pullExtensions()
return self.extensions
class _GLQuerier( ExtensionQuerier ):
prefix = as_8_bit('GL_')
version_prefix = as_8_bit('GL_VERSION_GL_')
assumed_version = [1,1]
def pullVersion( self ):
"""Retrieve 2-int declaration of major/minor GL version
returns [int(major),int(minor)] or False if not loaded
"""
from OpenGL import platform
if not platform.PLATFORM.CurrentContextIsValid():
return False
from OpenGL.raw.GL.VERSION.GL_1_1 import glGetString
from OpenGL.raw.GL.VERSION.GL_1_1 import GL_VERSION
new = glGetString( GL_VERSION )
self.version_string = new
if new:
return [
int(x) for x in new.split(as_8_bit(' '),1)[0].split( as_8_bit('.') )
]
else:
return False # not yet loaded/supported
def pullExtensions( self ):
from OpenGL import platform
if not platform.PLATFORM.CurrentContextIsValid():
return False
from OpenGL.raw.GL._types import GLint
from OpenGL.raw.GL.VERSION.GL_1_1 import glGetString, glGetError
from OpenGL.raw.GL.VERSION.GL_1_1 import GL_EXTENSIONS
from OpenGL import error
try:
extensions = glGetString( GL_EXTENSIONS )
if glGetError():
raise error.GLError()
if extensions:
extensions = extensions.split()
else:
return False
except (AttributeError, error.GLError):
# OpenGL 3.0 deprecates glGetString( GL_EXTENSIONS )
from OpenGL.raw.GL.VERSION.GL_3_0 import GL_NUM_EXTENSIONS, glGetStringi
from OpenGL.raw.GL.VERSION.GL_1_1 import glGetIntegerv
count = GLint()
glGetIntegerv( GL_NUM_EXTENSIONS, count )
extensions = []
for i in range( count.value ):
extension = glGetStringi( GL_EXTENSIONS, i )
extensions.append(
extension
)
# Add included-by-reference extensions...
version = self.getVersion()
if not version:
# should not be possible?
return version
check = tuple( version[:2] )
for (v,v_exts) in VERSION_EXTENSIONS:
if v <= check:
for v_ext in v_exts:
if v_ext not in extensions:
extensions.append( as_8_bit(v_ext) )
else:
break
return extensions
GLQuerier = _GLQuerier()
class _GLUQuerier( ExtensionQuerier ):
prefix = as_8_bit('GLU_')
version_prefix = as_8_bit('GLU_VERSION_GL_')
def pullVersion( self ):
from OpenGL.GLU import gluGetString,GLU_VERSION
return [
int(x) for x in gluGetString( GLU_VERSION ).split(as_8_bit('_'))
if x.isdigit()
]
def pullExtensions( self ):
from OpenGL.GLU import gluGetString,GLU_EXTENSIONS
return gluGetString( GLU_EXTENSIONS ).split()
GLUQuerier = _GLUQuerier()
def hasExtension( specifier ):
return ExtensionQuerier.hasExtension( specifier )
hasGLExtension = hasGLUExtension = hasExtension
class _Alternate( LateBind ):
def __init__( self, name, *alternates ):
"""Initialize set of alternative implementations of the same function"""
self.__name__ = name
self._alternatives = alternates
if root.MODULE_ANNOTATIONS:
frame = sys._getframe().f_back
if frame and frame.f_back and '__name__' in frame.f_back.f_globals:
self.__module__ = frame.f_back.f_globals['__name__']
def __bool__( self ):
from OpenGL import error
try:
return bool( self.getFinalCall())
except error.NullFunctionError as err:
return False
__nonzero__ = __bool__ # Python 2.6 compatibility
def finalise( self ):
"""Call, doing a late lookup and bind to find an implementation"""
for alternate in self._alternatives:
if alternate:
# _log.info(
# """Chose alternate: %s from %s""",
# alternate.__name__,
# ", ".join([x.__name__ for x in self._alternatives])
# )
return alternate
from OpenGL import error
raise error.NullFunctionError(
"""Attempt to call an undefined alternate function (%s), check for bool(%s) before calling"""%(
', '.join([x.__name__ for x in self._alternatives]),
self.__name__,
)
)
def alternate( name, *functions ):
"""Construct a callable that functions as the first implementation found of given set of alternatives
if name is a function then its name will be used....
"""
if not isinstance( name, (bytes,unicode)):
functions = (name,)+functions
name = name.__name__
return type( name, (_Alternate,), {} )( name, *functions )
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