glTexBuffer — attach the storage for a buffer object to the active buffer texture
void glTexBuffer( | GLenum | target, |
| GLenum | internalFormat, | |
| GLuint | buffer); |
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.
bufferSpecifies the name of the buffer object whose storage to attach to the active buffer texture.
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
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.
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.
glGet
with argument GL_MAX_TEXTURE_BUFFER_SIZE
glGet
with argument GL_TEXTURE_BINDING_BUFFER
glGetTexLevelParameter
with argument GL_TEXTURE_BUFFER_DATA_STORE_BINDING
glGenBuffers, glBindBuffer, glBufferData, glDeleteBuffers, glGenTextures, glBindTexture, glDeleteTextures
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