glTexBuffer : PyOpenGL 3.0.2 GL Man Pages

attach the storage for a buffer object to the active buffer texture

Signature

glTexBuffer( GLenum ( target ) , GLenum ( internalFormat ) , Gluint( buffer ) )-> void

glTexBuffer( target , internalformat , buffer )

Parameters

Variables	Description
target	Specifies the target of the operation and must be GL_TEXTURE_BUFFER .
internalFormat	Specifies the internal format of the data in the store belonging to buffer .
buffer	Specifies the name of the buffer object whose storage to attach to the active buffer texture.

Description

glTexBuffer attaches the storage for the buffer object named buffer to the active buffer texture, and specifies the internal format for the texel array found in the attached buffer object. If buffer is zero, any buffer object attached to the buffer texture is detached and no new buffer object is attached. If buffer is non-zero, it must be the name of an existing buffer object. target must be GL_TEXTURE_BUFFER . internalformat specifies the storage format, and must be one of the following sized internal formats:

				Component
Sized Internal Format	Base Type	Components	Norm	0	1	2	3
GL_R8	ubyte	1	YES	R	0	0	1
GL_R16	ushort	1	YES	R	0	0	1
GL_R16F	half	1	NO	R	0	0	1
GL_R32F	float	1	NO	R	0	0	1
GL_R8I	byte	1	NO	R	0	0	1
GL_R16I	short	1	NO	R	0	0	1
GL_R32I	int	1	NO	R	0	0	1
GL_R8UI	ubyte	1	NO	R	0	0	1
GL_R16UI	ushort	1	NO	R	0	0	1
GL_R32UI	uint	1	NO	R	0	0	1
GL_RG8	ubyte	2	YES	R	G	0	1
GL_RG16	ushort	2	YES	R	G	0	1
GL_RG16F	half	2	NO	R	G	0	1
GL_RG32F	float	2	NO	R	G	0	1
GL_RG8I	byte	2	NO	R	G	0	1
GL_RG16I	short	2	NO	R	G	0	1
GL_RG32I	int	2	NO	R	G	0	1
GL_RG8UI	ubyte	2	NO	R	G	0	1
GL_RG16UI	ushort	2	NO	R	G	0	1
GL_RG32UI	uint	2	NO	R	G	0	1
GL_RGB32F	float	3	NO	R	G	B	1
GL_RGB32I	int	3	NO	R	G	B	1
GL_RGB32UI	uint	3	NO	R	G	B	1
GL_RGBA8	uint	4	YES	R	G	B	A
GL_RGBA16	short	4	YES	R	G	B	A
GL_RGBA16F	half	4	NO	R	G	B	A
GL_RGBA32F	float	4	NO	R	G	B	A
GL_RGBA8I	byte	4	NO	R	G	B	A
GL_RGBA16I	short	4	NO	R	G	B	A
GL_RGBA32I	int	4	NO	R	G	B	A
GL_RGBA8UI	ubyte	4	NO	R	G	B	A
GL_RGBA16UI	ushort	4	NO	R	G	B	A
GL_RGBA32UI	uint	4	NO	R	G	B	A

When a buffer object is attached to a buffer texture, the buffer object's data store is taken as the texture's texel array. The number of texels in the buffer texture's texel array is given by

buffer_size

components

sizeof

(

base_type

)

where buffer_size is the size of the buffer object, in basic machine units and components and base type are the element count and base data type for elements, as specified in the table above. The number of texels in the texel array is then clamped to the implementation-dependent limit GL_MAX_TEXTURE_BUFFER_SIZE . When a buffer texture is accessed in a shader, the results of a texel fetch are undefined if the specified texel coordinate is negative, or greater than or equal to the clamped number of texels in the texel array.

Errors

GL_INVALID_ENUM is generated if target is not GL_TEXTURE_BUFFER .

GL_INVALID_ENUM is generated if internalFormat is not one of the accepted tokens.

GL_INVALID_OPERATION is generated if buffer is not zero or the name of an existing buffer object.

Notes

glTexBuffer is available only if the GL version is 3.1 or greater.

Associated Gets

glGet with argument GL_MAX_TEXTURE_BUFFER_SIZE

glGet with argument GL_TEXTURE_BINDING_BUFFER

glGetTexLevelParameter with argument GL_TEXTURE_BUFFER_DATA_STORE_BINDING

Copyright

2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/ .

Sample Code References

The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.

glTexBuffer

OpenGLContext OpenGLContext/scenegraph/shaders.py Lines: 252