Python ArrayDatatype.voidDataPointer方法代码示例

# 需要导入模块: from OpenGL.arrays.arraydatatype import ArrayDatatype [as 别名]
# 或者: from OpenGL.arrays.arraydatatype.ArrayDatatype import voidDataPointer [as 别名]
def glVertexAttribPointer(
    baseOperation, index, size, type,
    normalized, stride, pointer,
):
    """Set an attribute pointer for a given shader (index)

    index -- the index of the generic vertex to bind, see
        glGetAttribLocation for retrieval of the value,
        note that index is a global variable, not per-shader
    size -- number of basic elements per record, 1,2,3, or 4
    type -- enum constant for data-type
    normalized -- whether to perform int to float
        normalization on integer-type values
    stride -- stride in machine units (bytes) between
        consecutive records, normally used to create
        "interleaved" arrays
    pointer -- data-pointer which provides the data-values,
        normally a vertex-buffer-object or offset into the
        same.

    This implementation stores a copy of the data-pointer
    in the contextdata structure in order to prevent null-
    reference errors in the renderer.
    """
    array = ArrayDatatype.asArray( pointer, type )
    key = ('vertex-attrib',index)
    contextdata.setValue( key, array )
    return baseOperation(
        index, size, type,
        normalized, stride,
        ArrayDatatype.voidDataPointer( array )
    )

# 需要导入模块: from OpenGL.arrays.arraydatatype import ArrayDatatype [as 别名]
# 或者: from OpenGL.arrays.arraydatatype.ArrayDatatype import voidDataPointer [as 别名]
 def copy_data( self ):
     """Copy our data into the buffer on the GL side (if required)
     
     Ensures that the GL's version of the data in the VBO matches our 
     internal view of the data, either by copying the entire data-set 
     over with glBufferData or by updating the already-transferred 
     data with glBufferSubData.
     """
     assert self.buffers, """Should do create_buffers before copy_data"""
     if self.copied:
         if self._copy_segments:
             while self._copy_segments:
                 start,size,data  = self._copy_segments.pop(0)
                 dataptr = ArrayDatatype.voidDataPointer( data )
                 self.implementation.glBufferSubData(self.target, start, size, dataptr)
     else:
         if self.data is not None and self.size is None:
             self.size = ArrayDatatype.arrayByteCount( self.data )
         self.implementation.glBufferData(
             self.target,
             self.size,
             self.data,
             self.usage,
         )
         self.copied = True

# 需要导入模块: from OpenGL.arrays.arraydatatype import ArrayDatatype [as 别名]
# 或者: from OpenGL.arrays.arraydatatype.ArrayDatatype import voidDataPointer [as 别名]
	def copy_data( self ):
		"""Copy our data into the buffer on the GL side"""
		assert self.buffers, """Should do create_buffers before copy_data"""
		if self.copied:
			if self._copy_segments:
				while self._copy_segments:
					start,size,data  = self._copy_segments.pop(0)
					dataptr = ArrayDatatype.voidDataPointer( data )
					self.implementation.glBufferSubData(self.target, start, size, dataptr)
		else:
			self.implementation.glBufferData(
				self.target, 
				self.data,
				self.usage,
			)
			self.copied = True

# 需要导入模块: from OpenGL.arrays.arraydatatype import ArrayDatatype [as 别名]
# 或者: from OpenGL.arrays.arraydatatype.ArrayDatatype import voidDataPointer [as 别名]
 def setSlice(self, start, size, data):
     """
     sets a slice of data.
     """
     dataptr = ArrayDatatype.voidDataPointer( data )
     gl.glBufferSubData( self.target, start, size, dataptr )