/usr/lib/python2.7/dist-packages/OpenGL/extensions.py is in python-opengl 3.0.2-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | """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,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), [
'GL_ARB_vertex_array_object',
'GL_ARB_texture_buffer_object',
'GL_ARB_framebuffer_object',
'GL_ARB_map_buffer_range',
]),
((3,1), [
'GL_ARB_copy_buffer',
'GL_ARB_uniform_buffer_object',
]),
((3,2), [
'GL_ARB_draw_elements_base_vertex',
'GL_ARB_provoking_vertex',
'GL_ARB_sync',
'GL_ARB_texture_multisample',
]),
((3,3), [
'GL_ARB_texture_multisample',
'GL_ARB_blend_func_extended',
'GL_ARB_sampler_objects',
'GL_ARB_explicit_attrib_location',
'GL_ARB_occlusion_query2',
'GL_ARB_shader_bit_encoding',
'GL_ARB_texture_rgb10_a2ui',
'GL_ARB_texture_swizzle',
'GL_ARB_timer_query',
'GL_ARB_vertex_type_2_10_10_10_rev',
]),
((4,0), [
'GL_ARB_texture_query_lod',
'GL_ARB_draw_indirect',
'GL_ARB_gpu_shader5',
'GL_ARB_gpu_shader_fp64',
'GL_ARB_shader_subroutine',
'GL_ARB_tessellation_shader',
'GL_ARB_texture_buffer_object_rgb32',
'GL_ARB_texture_cube_map_array',
'GL_ARB_texture_gather',
'GL_ARB_transform_feedback2',
'GL_ARB_transform_feedback3',
]),
((4,1), [
'GL_ARB_ES2_compatibility',
'GL_ARB_get_program_binary',
'GL_ARB_separate_shader_objects',
'GL_ARB_shader_precision',
'GL_ARB_vertex_attrib_64bit',
'GL_ARB_viewport_array',
]),
((4,2), [
'GL_ARB_base_instance',
'GL_ARB_shading_language_420pack',
'GL_ARB_transform_feedback_instanced',
'GL_ARB_compressed_texture_pixel_storage',
'GL_ARB_conservative_depth',
'GL_ARB_internalformat_query',
'GL_ARB_map_buffer_alignment',
'GL_ARB_shader_atomic_counters',
'GL_ARB_shader_image_load_store',
'GL_ARB_shading_language_packing',
'GL_ARB_texture_storage',
]),
]
def getGLVersion( ):
"""Retrieve 2-int declaration of major/minor GL version
returns [int(major),int(minor)] or False if not loaded
"""
global CURRENT_GL_VERSION
if not CURRENT_GL_VERSION:
from OpenGL.GL import glGetString, GL_VERSION
new = glGetString( GL_VERSION )
log.info( 'OpenGL Version: %s', new )
if new:
CURRENT_GL_VERSION = [
int(x) for x in new.split(as_8_bit(' '),1)[0].split( as_8_bit('.') )
]
else:
return False # not yet loaded/supported
return CURRENT_GL_VERSION
def hasGLExtension( specifier ):
"""Given a string specifier, check for extension being available"""
global AVAILABLE_GL_EXTENSIONS
specifier = as_8_bit(specifier).replace(as_8_bit('.'),as_8_bit('_'))
if specifier.startswith( VERSION_PREFIX ):
specifier = [
int(x)
for x in specifier[ len(VERSION_PREFIX):].split(as_8_bit('_'))
]
version = getGLVersion()
if not version:
return version
return specifier <= version
else:
from OpenGL.GL import glGetString, GL_EXTENSIONS
from OpenGL import error
if not AVAILABLE_GL_EXTENSIONS:
try:
AVAILABLE_GL_EXTENSIONS[:] = glGetString( GL_EXTENSIONS ).split()
except (AttributeError, error.GLError), err:
# OpenGL 3.0 deprecates glGetString( GL_EXTENSIONS )
from OpenGL.GL.VERSION.GL_3_0 import GL_NUM_EXTENSIONS, glGetStringi
from OpenGL.GL import glGetIntegerv
count = glGetIntegerv( GL_NUM_EXTENSIONS )
for i in range( count ):
extension = glGetStringi( GL_EXTENSIONS, i )
AVAILABLE_GL_EXTENSIONS.append(
extension
)
# Add included-by-reference extensions...
version = getGLVersion()
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 AVAILABLE_GL_EXTENSIONS:
AVAILABLE_GL_EXTENSIONS.append( v_ext )
else:
break
result = specifier in AVAILABLE_GL_EXTENSIONS
log.info(
'GL Extension %s %s',
specifier,
['unavailable','available'][bool(result)]
)
return result
def hasGLUExtension( specifier ):
"""Given a string specifier, check for extension being available"""
from OpenGL.GLU import gluGetString, GLU_EXTENSIONS
if not AVAILABLE_GLU_EXTENSIONS:
AVAILABLE_GLU_EXTENSIONS[:] = gluGetString( GLU_EXTENSIONS )
return specifier.replace(as_8_bit('.'),as_8_bit('_')) in AVAILABLE_GLU_EXTENSIONS
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, 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, (str,unicode)):
functions = (name,)+functions
name = name.__name__
return type( name, (_Alternate,), {} )( name, *functions )
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