Re: [Dri-devel] GL_MESA_ycbcr_texture possible with the old radeon?

[Ian R. <id...@us...>]

Andreas Stenglein wrote:
> In radeon_reg.h there are some new txformats:
> RADEON_TXFORMAT_VYUY422
> RADEON_TXFORMAT_YVYU422
> 
> Would it be possible to make the
> MESA_ycbcr_texture extension available for the
> original (old) radeon or are there some issues
> which prevent this?
> 
> Are there other extensions which could be
> "backported" from the R200-driver?
> Maybe GL_NV_texture_rectangle, GL_ARB_texture_cube_map ?

I believe the MESA_ycbcr_texture should be supportable on all of the 
hardware that is currently supported by DRI.  I know that the G400, Rage 
128, R100, and i830 can all do it.  I'm pretty sure all the 3dfx cards 
can do it, but I don't know about the gamma.

There are a few other extensions that the r100 (and r200) can support, 
but don't.  Here is a list that I came up with a few months ago.

R100 / R200:

- ARB_texture_env_crossbar
- EXT_fog_coord - This requires using fp4 format for the secondary / 
specular color.  The fog coordinate lives in the alpha value.
- ATI_envmap_bumpmap - This would also need support in Mesa.
- NV_texture_rectangle (for r100)
- ARB_texture_cube_map (for r100) - There is some work need for both the 
r100 and the r200.  The ATI chips are a bit quirky in that they only 
support 3 coordinates in a texture coordinate.  This means that for 
cubemapping the Q coordinate needs to be put where the R coordinate belongs.
- EXT_stencil_wrap (for r100) - I tried to add support for this, but it 
was a bit "quirky."  I never managed to get it working well enough to 
pass Mesa's tests/texwrap.
- MESA_ycbcr_texture (for r100)
- ARB_vertex_blend / ARB_matrix_palette - This would also need support 
in Mesa.
- EXT_texture3D - Hardware support. :)

MGA:

- ARB_texture_env_combine / EXT_texture_env_combine - There would be 
quite a few fallbacks, but a good portion of the "common" modes could be 
supported.
- ARB_texture_env_crossbar
- EXT_texture_palette / EXT_shared_texture_palette
- MESA_ycbcr_texture
- NV_texture_rectangle
- ATI_envmap_bumpmap

i830:

- ARB_texture_env_crossbar
- ARB_texture_cube_map
- EXT_texture_palette / EXT_shared_texture_palette
- 3DFX_texture_compression_fxt1
- MESA_ycbcr_texture
- NV_texture_rectangle
- NV_blend_square - I think the i830 can support this.
- ATI_envmap_bumpmap

i810:

- ARB_texture_env_combine / EXT_texture_env_combine - There would be 
quite a few fallbacks, but a good portion of the "common" modes could be 
supported.
- ARB_texture_env_crossbar
- EXT_texture_palette / EXT_shared_texture_palette
- Texture wrap extensions?
- MESA_ycbcr_texture
- NV_texture_rectangle

Rage128:

- ARB_texture_env_combine / EXT_texture_env_combine - There would be 
quite a few fallbacks, but a good portion of the "common" modes could be 
supported.
- ARB_texture_env_crossbar
- EXT_texture_palette / EXT_shared_texture_palette
- Texture wrap extensions?
- EXT_blend_subtract
- NV_blend_square
- MESA_ycbcr_texture