glTexBufferRange, glTextureBufferRange - attach a range of a buffer object's data store to a buffer

glGet() with argument GL_TEXTURE_BUFFER_OFFSET_ALIGNMENTglGetTexLevelParameter() with arguments GL_TEXTURE_BUFFER_OFFSET or GL_TEXTURE_BUFFER_SIZE.

voidglTexBufferRange(GLenumtarget,GLenuminternalFormat,GLuintbuffer,GLintptroffset,GLsizeiptrsize);voidglTextureBufferRange(GLuinttexture,GLenuminternalformat,GLuintbuffer,GLintptroffset,GLsizeisize);

       Copyright © 2012-2014 Khronos Group

[FIXME: source]                                    11/18/2024                               GLTEXBUFFERRANGE(3G)

glTexBufferRange and glTextureBufferRange attach a range of 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.

       The start and size of the range are specified by offset and size respectively, both measured in basic
       machine units.  offset must be greater than or equal to zero, size must be greater than zero, and the sum
       of offset and size must not exceed the value of GL_BUFFER_SIZE for buffer. Furthermore, offset must be an
       integer multiple of the value of GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT.

       internalformat specifies the storage format, and must be one of the following sized internal formats:
       ┌─────────────┬───────────┬────────────┬──────┬───────────────┐
       │             │           │            │      │   Component   │
       ├─────────────┼───────────┼────────────┼──────┼───┬───┬───┬───┤
       │ Sized       │ BaseType │ Components │ Norm │ 0 │ 1 │ 2 │ 3 │
       │ Internal    │           │            │      │   │   │   │   │
       │ Format      │           │            │      │   │   │   │   │
       ├─────────────┼───────────┼────────────┼──────┼───┼───┼───┼───┤
       │ 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 range of a buffer object is attached to a buffer texture, the specified range of 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 $components$ 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.

GL_INVALID_ENUM is generated by glTexBufferRange if target is not GL_TEXTURE_BUFFER.

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

       GL_INVALID_ENUM is generated by glTextureBufferRange 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.

       GL_INVALID_VALUE is generated if offset is negative, if size is less than or equal to zero, or if offset
       + size is greater than the value of GL_BUFFER_SIZE for buffer.

       GL_INVALID_VALUE is generated if offset is not an integer multiple of the value of
       GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT.

       glTexBufferRange, glTextureBufferRange - attach a range of a buffer object's data store to a buffer
       texture object

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

       texture
           Specifies the texture object name for glTextureBufferRange.

       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.

       offset
           Specifies the offset of the start of the range of the buffer's data store to attach.

       size
           Specifies the size of the range of the buffer's data store to attach.

glTexBuffer().

       ┌──────────────────────┬───────────────────────────────────────────────────────────────────────┐
       │                      │                OpenGLVersion                                         │
       ├──────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │ Function             │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │ /                    │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Feature              │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Name                 │     │     │     │     │     │     │     │     │     │     │     │     │
       ├──────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glTexBufferRange     │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │  ✔  │  ✔  │
       ├──────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glTextureBufferRange │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │
       └──────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘