mesa/core: Add definitions and translations for EXT_texture_sRGB_R8

v2: - fix format definition line
    - disable  for desktop GL
    - don't add GL_R8_EXT to glext.h since it is already in
      GLES2/gl2ext.h in glext.h and include this header  where needed
      (all Emil)
v3: - swrast: Fill the function table for sRGB_R8
      The size of the function table is checked at compile time and must
      correspond to the number of mesa texture formats.
      dri/swrast being gles-2.0 doesn't support the extension though
v4: - correct format layout comment (Ilia Mirkin)
    - correct logic for accepting GL_RED only textures (in part Ilia Mirkin)
      EXT_texture_sRGB_R8 requires OpenGL ES 3.0 which includes
      ARB_texture_rg/EXT_texture_rg, so one only must check for the first
      when SR8_EXT is really requested.
v5: - add define for GL_ES8_XT to glheader.h and don't include GLES
      headers  (Ilia Mirkin)

Signed-off-by: Gert Wollny <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index d4cd5d2182c..cf2d2bc555a 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1108,6 +1108,7 @@ _mesa_uncompressed_format_to_type_and_comps(mesa_format format,
       *comps = 4;
       return;
    case MESA_FORMAT_L_SRGB8:
+   case MESA_FORMAT_R_SRGB8:
       *datatype = GL_UNSIGNED_BYTE;
       *comps = 1;
       return;
@@ -1670,6 +1671,7 @@ _mesa_format_matches_format_and_type(mesa_format mesa_format,
               (type == GL_UNSIGNED_SHORT_8_8_REV_MESA && littleEndian != swapBytes));
 
    case MESA_FORMAT_R_UNORM8:
+   case MESA_FORMAT_R_SRGB8:
       return format == GL_RED && type == GL_UNSIGNED_BYTE;
    case MESA_FORMAT_R8G8_UNORM:
       return format == GL_RG && type == GL_UNSIGNED_BYTE && littleEndian;