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docs.GL

glTexBuffer

Name

glTexBuffer, glTextureBuffer — attach a buffer object's data store to a buffer texture object

C Specification

void glTexBuffer( GLenum target,
GLenum internalFormat,
GLuint buffer);
void glTextureBuffer( GLuint texture,
GLenum internalformat,
GLuint buffer);

Parameters

target

Specifies the target to which the texture is bound for glTexBuffer. Must be GL_TEXTURE_BUFFER.

texture

Specifies the texture object name for glTextureBuffer.

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 and glTextureBuffer attaches the data store of a specified buffer object to a specified texture object, and specify the storage format for the texture image found found in the buffer object. The texture object must be a buffer texture.

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.

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 $$ \left\lfloor { size \over { components \times sizeof(base\_type) } } \right\rfloor $$ where $size$ is the size of the buffer object in basic machine units (the value of GL_BUFFER_SIZE for buffer), 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 value of 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 by glTexBuffer if target is not GL_TEXTURE_BUFFER.

GL_INVALID_OPERATION is generated by glTextureBuffer if texture is not the name of an existing texture object.

GL_INVALID_ENUM is generated by glTextureBuffer if the effective target of texture is not GL_TEXTURE_BUFFER.

GL_INVALID_ENUM is generated if internalformat is not one of the sized internal formats described above.

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

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

Version Support

OpenGL Version
Function / Feature Name 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
glTexBuffer - - - ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
glTextureBuffer - - - - - - - - - - - ✔
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