EXT_texture_sRGB_R8

GL_EXT_texture_sRGB_R8

Sam Holmes
Maurice Ribble
Daniel Koch
Tobias Hector
Jan-Harald Fredriksen
Sourav Parmar

Maurice Ribble (mribble 'at' qti.qualcomm.com)

Complete.

Last Modified Date: November 30, 2018
Revision: 5

OpenGL ES Extension #221
OpenGL Extension #534

OpenGL ES 3.0 or OpenGL 1.2 is required.

This extension is written against the OpenGL ES 3.1 and
OpenGL 4.6 (Core Profile) specifications.

This extension interacts with ARB_texture_view.

This extension interacts with EXT_texture_view.

This extension interacts with OES_texture_view.

This extension interacts with ARB_direct_state_access.

This extension introduces SR8_EXT as an acceptable internal format.
This allows efficient sRGB sampling for source images stored as a separate
texture per channel.

None

Accepted by the <internalformat> parameters of TexImage3D, TexImage2D,
TexImage1D, TexStorage3D, TexStorage2D, TexStorage1D, TextureStorage3D,
TextureStorage2D, and TextureStorage1D:

    SR8_EXT    0x8FBD

The following table entry is added to Table 8.2 (Valid combinations of
format, type and sized internalformat):

    Format    Type             External Bytes per Pixel    Internal Format
    ------    ----             ------------------------    ---------------
    RED       UNSIGNED_BYTE    1                           SR8_EXT

The following table entry is added to Table 8.13 [8.12 in the GL 4.6 core
profile] (Correspondence of sized internal color formats to base internal
formats):

    Sized Internal Format    Base Internal Format    R    G    B    A    S    CR    TF    Req. rend.    Req. tex.
    ---------------------    --------------------    -    -    -    -    -    --    --    ----------    ---------
    SR8_EXT                  RED                     8                              X                      X

The following table entry is added to Table 8.22 in the GL 4.6 core profile
(Compatible internal formats for TextureView):

    Class              Internal formats
    ---------------    ----------------
    VIEW_CLASS_8_BITS  SR8_EXT

The following table entry is added to Table 8.24 [8.24 in the GL 4.6 core
profile] (sRGB texture internal formats):

    Internal Format
    ---------------
    SR8_EXT

If OpenGL is not supported, ignore all references to 1D textures,
including TexImage1D, TexStorage1D, and TextureStorage1D.

If neither OpenGL 4.5 nor ARB_direct_state_access are supported,
ignore all references to TextureStorage3D, TextureStorage2D, and
TextureStorage1D.

If ARB_texture_view is supported, add SR8_EXT to the Internal formats
column of the VIEW_CLASS_8_BITS row in Table 3.X.2.

If EXT_texture_view is supported, add SR8_EXT to the Internal formats
column of the VIEW_CLASS_8_BITS row in Table 8.X.2.

If OES_texture_view is supported, add SR8_EXT to the Internal formats
column of the VIEW_CLASS_8_BITS row in Table 8.X.2.

None

None