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'''OpenGL extension VERSION.GL_2_0
This module customises the behaviour of the
OpenGL.raw.GL.VERSION.GL_2_0 to provide a more
Python-friendly API
'''
from OpenGL import platform, constants, constant, arrays
from OpenGL import extensions, wrapper
from OpenGL.GL import glget
import ctypes
from OpenGL.raw.GL.VERSION.GL_2_0 import *
### END AUTOGENERATED SECTION
import OpenGL
from OpenGL.raw.GL.ARB.shader_objects import GL_OBJECT_COMPILE_STATUS_ARB as GL_OBJECT_COMPILE_STATUS
from OpenGL.raw.GL.ARB.shader_objects import GL_OBJECT_LINK_STATUS_ARB as GL_OBJECT_LINK_STATUS
from OpenGL.GL.ARB.shader_objects import glGetInfoLogARB as glGetInfoLog
from OpenGL import converters, error
GL_INFO_LOG_LENGTH = constant.Constant( 'GL_INFO_LOG_LENGTH', 0x8B84 )
glShaderSource = platform.createBaseFunction(
'glShaderSource', dll=platform.GL,
resultType=None,
argTypes=(constants.GLhandle, constants.GLsizei, ctypes.POINTER(ctypes.c_char_p), arrays.GLintArray,),
doc = 'glShaderSource( GLhandle(shaderObj), str( string) ) -> None',
argNames = ('shaderObj', 'count', 'string', 'length',),
)
conv = converters.StringLengths( name='string' )
glShaderSource = wrapper.wrapper(
glShaderSource
).setPyConverter(
'count' # number of strings
).setPyConverter(
'length' # lengths of strings
).setPyConverter(
'string', conv.stringArray
).setCResolver(
'string', conv.stringArrayForC,
).setCConverter(
'length', conv,
).setCConverter(
'count', conv.totalCount,
)
del conv
for size in (1,2,3,4):
for format,arrayType in (
('f',arrays.GLfloatArray),
('i',arrays.GLintArray),
):
name = 'glUniform%(size)s%(format)sv'%globals()
globals()[name] = arrays.setInputArraySizeType(
globals()[name],
size,
arrayType,
'value',
)
del format, arrayType
del size
def _afterCheck( key ):
"""Generate an error-checking function for compilation operations"""
if key == GL_OBJECT_COMPILE_STATUS:
getter = glGetShaderiv
else:
getter = glGetProgramiv
def GLSLCheckError(
result,
baseOperation=None,
cArguments=None,
*args
):
result = error.glCheckError( result, baseOperation, cArguments, *args )
status = ctypes.c_int()
getter( cArguments[0], key, ctypes.byref(status))
status = status.value
if not status:
raise error.GLError(
result = result,
baseOperation = baseOperation,
cArguments = cArguments,
description= glGetInfoLog( cArguments[0] )
)
return result
return GLSLCheckError
if OpenGL.ERROR_CHECKING:
glCompileShader.errcheck = _afterCheck( GL_OBJECT_COMPILE_STATUS )
if OpenGL.ERROR_CHECKING:
glLinkProgram.errcheck = _afterCheck( GL_OBJECT_LINK_STATUS )
## Not sure why, but these give invalid operation :(
##if glValidateProgram and OpenGL.ERROR_CHECKING:
## glValidateProgram.errcheck = _afterCheck( GL_OBJECT_VALIDATE_STATUS )
base_glGetShaderSource = glGetShaderSource
def glGetShaderSource( obj ):
"""Retrieve the program/shader's source code as a Python string
returns string which is '' if no source code
"""
length = int(glGetObjectParameteriv(obj, GL_OBJECT_SHADER_SOURCE_LENGTH))
if length > 0:
source = ctypes.create_string_buffer(length)
base_glGetShaderSource(obj, length, None, source)
return source.value.strip('\000') # null-termination
return ''
glGetShaderSource.wrappedOperation = base_glGetShaderSource
base_glGetActiveUniform = glGetActiveUniform
def glGetActiveUniform(program, index):
"""Retrieve the name, size and type of the uniform of the index in the program"""
max_index = int(glGetObjectParameteriv( program, GL_OBJECT_ACTIVE_UNIFORMS ))
length = int(glGetObjectParameteriv( program, GL_OBJECT_ACTIVE_UNIFORM_MAX_LENGTH))
if index < max_index and index >= 0 and length > 0:
name = ctypes.create_string_buffer(length)
size = arrays.GLintArray.zeros( (1,))
gl_type = arrays.GLuintArray.zeros( (1,))
base_glGetActiveUniform(program, index, length, None, size, gl_type, name)
return name.value, size[0], gl_type[0]
raise IndexError, 'Index %s out of range 0 to %i' % (index, max_index - 1, )
glGetActiveUniform.wrappedOperation = base_glGetActiveUniform
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