i965: Add support for GL_EXT_texture_shared_exponent.

Only one failure in piglit on gen6, which is texwrap with bordercolor
(as usual).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

docs/relnotes-7.12.html

@@ -36,6 +36,7 @@ tbd
 
 <h2>New features</h2>
 <ul>
+<li>GL_EXT_texture_shared_exponent (i965)
 </ul>
 
 

src/mesa/drivers/dri/i965/brw_wm_surface_state.c

@@ -121,6 +121,7 @@ brw_format_for_mesa_format(gl_format mesa_format)
       [MESA_FORMAT_SIGNED_RED_RGTC1] = BRW_SURFACEFORMAT_BC4_SNORM,
       [MESA_FORMAT_RG_RGTC2] = BRW_SURFACEFORMAT_BC5_UNORM,
       [MESA_FORMAT_SIGNED_RG_RGTC2] = BRW_SURFACEFORMAT_BC5_SNORM,
+      [MESA_FORMAT_RGB9_E5_FLOAT] = BRW_SURFACEFORMAT_R9G9B9E5_SHAREDEXP,
    };
    assert(mesa_format < MESA_FORMAT_COUNT);
    return table[mesa_format];

src/mesa/drivers/dri/intel/intel_context.c

@@ -730,6 +730,9 @@ intelInitContext(struct intel_context *intel,
    ctx->TextureFormatSupported[MESA_FORMAT_LUMINANCE_FLOAT32] = GL_TRUE;
    ctx->TextureFormatSupported[MESA_FORMAT_ALPHA_FLOAT32] = GL_TRUE;
    ctx->TextureFormatSupported[MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32] = GL_TRUE;
+
+   /* GL_EXT_texture_shared_exponent */
+   ctx->TextureFormatSupported[MESA_FORMAT_RGB9_E5_FLOAT] = GL_TRUE;
 #endif
 
 #endif /* !I915 */

src/mesa/drivers/dri/intel/intel_extensions.c

@@ -132,6 +132,7 @@ intelInitExtensions(struct gl_context *ctx)
       ctx->Extensions.ARB_shader_texture_lod = true;
 #ifdef TEXTURE_FLOAT_ENABLED
       ctx->Extensions.ARB_texture_float = true;
+      ctx->Extensions.EXT_texture_shared_exponent = true;
 #endif
       ctx->Extensions.ARB_texture_compression_rgtc = true;
       ctx->Extensions.ARB_texture_rg = true;