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glTexBuffer

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:

Sized Internal FormatBase TypeComponentsNorm Component
0123
GL_R8ubyte1YESR001
GL_R16ushort1YESR001
GL_R16Fhalf1NOR001
GL_R32Ffloat1NOR001
GL_R8Ibyte1NOR001
GL_R16Ishort1NOR001
GL_R32Iint1NOR001
GL_R8UIubyte1NOR001
GL_R16UIushort1NOR001
GL_R32UIuint1NOR001
GL_RG8ubyte2YESRG01
GL_RG16ushort2YESRG01
GL_RG16Fhalf2NORG01
GL_RG32Ffloat2NORG01
GL_RG8Ibyte2NORG01
GL_RG16Ishort2NORG01
GL_RG32Iint2NORG01
GL_RG8UIubyte2NORG01
GL_RG16UIushort2NORG01
GL_RG32UIuint2NORG01
GL_RGBA8uint4YESRGBA
GL_RGBA16short4YESRGBA
GL_RGBA16Fhalf4NORGBA
GL_RGBA32Ffloat4NORGBA
GL_RGBA8Ibyte4NORGBA
GL_RGBA16Ishort4NORGBA
GL_RGBA32Iint4NORGBA
GL_RGBA8UIubyte4NORGBA
GL_RGBA16UIushort4NORGBA
GL_RGBA32UIuint4NORGBA

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

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