[Mesa-dev] [PATCH v2 03/29] mesa/main: clean up S3_s3tc check

[Ian Romanick]

On 11/30/2018 02:17 PM, Marek Olšák wrote:
> 
> 
> On Fri, Nov 23, 2018 at 5:54 AM Erik Faye-Lund
> <erik.faye-lund at collabora.com <mailto:erik.faye-lund at collabora.com>> wrote:
> 
>     S3_s3tc is the extension that enables this functionality on desktop, so
>     let's check for that one. The _mesa_has_S3_s3tc() helper already
>     verifies the API according to the extension-table.
> 
>     Signed-off-by: Erik Faye-Lund <erik.faye-lund at collabora.com
>     <mailto:erik.faye-lund at collabora.com>>
>     ---
>      src/mesa/main/glformats.c | 8 +++-----
>      1 file changed, 3 insertions(+), 5 deletions(-)
> 
>     diff --git a/src/mesa/main/glformats.c b/src/mesa/main/glformats.c
>     index 9a507d11b96..b2c18aa6d94 100644
>     --- a/src/mesa/main/glformats.c
>     +++ b/src/mesa/main/glformats.c
>     @@ -1352,8 +1352,7 @@ _mesa_is_compressed_format(const struct
>     gl_context *ctx, GLenum format)
>         case GL_RGB4_S3TC:
>         case GL_RGBA_S3TC:
>         case GL_RGBA4_S3TC:
>     -      return _mesa_is_desktop_gl(ctx) &&
>     -         ctx->Extensions.ANGLE_texture_compression_dxt;
>     +      return _mesa_has_S3_s3tc(ctx);
>         case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
>            return ctx->API == API_OPENGL_COMPAT
>               && ctx->Extensions.ATI_texture_compression_3dc;
>     @@ -1378,9 +1377,8 @@ _mesa_is_compressed_format(const struct
>     gl_context *ctx, GLenum format)
>                */
>               return ctx->Extensions.ANGLE_texture_compression_dxt;
>            } else {
>     -         return _mesa_is_desktop_gl(ctx)
>     -            && ctx->Extensions.EXT_texture_sRGB
>     -            && ctx->Extensions.EXT_texture_compression_s3tc;
>     +         return _mesa_has_EXT_texture_sRGB(ctx) &&
>     +            _mesa_has_S3_s3tc(ctx);
> 
> This looks like it should be _mesa_has_EXT_texture_compression_s3tc.

I haven't looked at the code to verify, but I think
_mesa_has_EXT_texture_compression_s3tc can be true in OpenGL ES, but
_mesa_has_S3_s3tc cannot.  The original code has _mesa_is_desktop_gl, so
we don't want to allow ES.  But I also thought _mesa_has_S3_s3tc wasn't
allowed in core profile, so that might not be right either?

> Marek