GLTEXBUFFER(3G)

NAME
glTexBuffer - attach the storage for a buffer object to the active buffer texture

C SPECIFICATION

void glTexBuffer(GLenum target, GLenum internalFormat, GLuint buffer);

PARAMETERS

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_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)

            .PP 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

SEE ALSO

glGenBuffers(), glBindBuffer(), glBufferData(), glDeleteBuffers(), glGenTextures(), glBindTexture(), glDeleteTextures()

COPYRIGHT

Copyright © 2010-2013 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/.