Mesa (master): i965: Add support for SRGB DXT1 formats.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 06cb1a6a5bdba5654408e3568584e1ab168266b7
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=06cb1a6a5bdba5654408e3568584e1ab168266b7

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Jan  4 16:29:26 2011 -0800

i965: Add support for SRGB DXT1 formats.

This makes
fbo-generatemipmap-formats GL_EXT_texture_sRGB-s3tc
match
fbo-generatemipmap-formats GL_EXT_texture_compression_s3tc

and swrast in bad DXT1_RGBA alpha=0 handling, but it means we won't
unpack and repack someone's textures into uncompressed SARGB8 format.

---

 src/mesa/drivers/dri/i965/brw_defines.h          |    1 +
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c |    5 ++++-
 src/mesa/drivers/dri/intel/intel_context.c       |    6 +++++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index b48a30d..af7d6df 100644
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -389,6 +389,7 @@
 #define BRW_SURFACEFORMAT_R8_SSCALED                     0x149
 #define BRW_SURFACEFORMAT_R8_USCALED                     0x14A
 #define BRW_SURFACEFORMAT_L8_UNORM_SRGB                  0x14C
+#define BRW_SURFACEFORMAT_DXT1_RGB_SRGB                  0x180
 #define BRW_SURFACEFORMAT_R1_UINT                        0x181 
 #define BRW_SURFACEFORMAT_YCRCB_NORMAL                   0x182 
 #define BRW_SURFACEFORMAT_YCRCB_SWAPUVY                  0x183 
diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 1cd736a..16080b5 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -92,7 +92,10 @@ static uint32_t brw_format_for_mesa_format[MESA_FORMAT_COUNT] =
    [MESA_FORMAT_RGBA_DXT1] = BRW_SURFACEFORMAT_BC1_UNORM,
    [MESA_FORMAT_RGBA_DXT3] = BRW_SURFACEFORMAT_BC2_UNORM,
    [MESA_FORMAT_RGBA_DXT5] = BRW_SURFACEFORMAT_BC3_UNORM,
-   [MESA_FORMAT_SRGB_DXT1] = BRW_SURFACEFORMAT_BC1_UNORM_SRGB,
+   [MESA_FORMAT_SRGB_DXT1] = BRW_SURFACEFORMAT_DXT1_RGB_SRGB,
+   [MESA_FORMAT_SRGBA_DXT1] = BRW_SURFACEFORMAT_BC1_UNORM_SRGB,
+   [MESA_FORMAT_SRGBA_DXT3] = BRW_SURFACEFORMAT_BC2_UNORM_SRGB,
+   [MESA_FORMAT_SRGBA_DXT5] = BRW_SURFACEFORMAT_BC3_UNORM_SRGB,
    [MESA_FORMAT_SARGB8] = BRW_SURFACEFORMAT_B8G8R8A8_UNORM_SRGB,
    [MESA_FORMAT_SLA8] = BRW_SURFACEFORMAT_L8A8_UNORM_SRGB,
    [MESA_FORMAT_SL8] = BRW_SURFACEFORMAT_L8_UNORM_SRGB,
diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 4255c0e..34deb2c 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -734,7 +734,11 @@ intelInitContext(struct intel_context *intel,
 
    /* GL_EXT_texture_sRGB */
    ctx->TextureFormatSupported[MESA_FORMAT_SARGB8] = GL_TRUE;
-   ctx->TextureFormatSupported[MESA_FORMAT_SRGB_DXT1] = GL_TRUE;
+   if (intel->gen >= 5 || intel->is_g4x)
+      ctx->TextureFormatSupported[MESA_FORMAT_SRGB_DXT1] = GL_TRUE;
+   ctx->TextureFormatSupported[MESA_FORMAT_SRGBA_DXT1] = GL_TRUE;
+   ctx->TextureFormatSupported[MESA_FORMAT_SRGBA_DXT3] = GL_TRUE;
+   ctx->TextureFormatSupported[MESA_FORMAT_SRGBA_DXT5] = GL_TRUE;
    if (intel->has_luminance_srgb) {
       ctx->TextureFormatSupported[MESA_FORMAT_SL8] = GL_TRUE;
       ctx->TextureFormatSupported[MESA_FORMAT_SLA8] = GL_TRUE;