mesa: Add MESA_FORMAT_S8_Z24 texture format

	None of the fetch and store functions implemented.
	This atleast stops shadowtex from locking the GPU on
	i915 with the linux-dri-x86 target. It most of it looks
	okay, with the exception of actually displaying the texture.

src/mesa/main/texformat.c

@@ -1207,6 +1207,41 @@ const struct gl_texture_format _mesa_texformat_z24_s8 = {
    store_texel_z24_s8			/* StoreTexel */
 };
 
+const struct gl_texture_format _mesa_texformat_s8_z24 = {
+   MESA_FORMAT_S8_Z24,			/* MesaFormat */
+   GL_DEPTH_STENCIL_EXT,		/* BaseFormat */
+   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
+   0,					/* RedBits */
+   0,					/* GreenBits */
+   0,					/* BlueBits */
+   0,					/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   24,					/* DepthBits */
+   8,					/* StencilBits */
+   4,					/* TexelBytes */
+#if 0
+   _mesa_texstore_s8_z24,		/* StoreTexImageFunc */
+#else
+   _mesa_texstore_z24_s8,		/* StoreTexImageFunc */
+#endif
+   NULL,				/* FetchTexel1D */
+   NULL,				/* FetchTexel2D */
+   NULL,				/* FetchTexel3D */
+#if 0
+   fetch_texel_1d_f_s8_z24,		/* FetchTexel1Df */
+   fetch_texel_2d_f_s8_z24,		/* FetchTexel2Df */
+   fetch_texel_3d_f_s8_z24,		/* FetchTexel3Df */
+   store_texel_s8_z24			/* StoreTexel */
+#else
+   fetch_texel_1d_f_z24_s8,		/* FetchTexel1Df */
+   fetch_texel_2d_f_z24_s8,		/* FetchTexel2Df */
+   fetch_texel_3d_f_z24_s8,		/* FetchTexel3Df */
+   store_texel_z24_s8			/* StoreTexel */
+#endif
+};
+
 const struct gl_texture_format _mesa_texformat_z16 = {
    MESA_FORMAT_Z16,			/* MesaFormat */
    GL_DEPTH_COMPONENT,			/* BaseFormat */

src/mesa/main/texformat.h

@@ -84,6 +84,7 @@ enum _format {
    MESA_FORMAT_YCBCR,		/*                     YYYY YYYY UorV UorV */
    MESA_FORMAT_YCBCR_REV,	/*                     UorV UorV YYYY YYYY */
    MESA_FORMAT_Z24_S8,          /* ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ SSSS SSSS */
+   MESA_FORMAT_S8_Z24,          /* SSSS SSSS ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ */
    MESA_FORMAT_Z16,             /*                     ZZZZ ZZZZ ZZZZ ZZZZ */
    MESA_FORMAT_Z32,             /* ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ ZZZZ */
    /*@}*/
@@ -209,6 +210,7 @@ extern const struct gl_texture_format _mesa_texformat_l8;
 extern const struct gl_texture_format _mesa_texformat_i8;
 extern const struct gl_texture_format _mesa_texformat_ci8;
 extern const struct gl_texture_format _mesa_texformat_z24_s8;
+extern const struct gl_texture_format _mesa_texformat_s8_z24;
 extern const struct gl_texture_format _mesa_texformat_z16;
 extern const struct gl_texture_format _mesa_texformat_z32;
 /*@}*/

src/mesa/state_tracker/st_format.c

@@ -274,6 +274,8 @@ st_mesa_format_to_pipe_format(GLuint mesaFormat)
       return PIPE_FORMAT_Z32_UNORM;
    case MESA_FORMAT_Z24_S8:
       return PIPE_FORMAT_Z24S8_UNORM;
+   case MESA_FORMAT_S8_Z24:
+      return PIPE_FORMAT_S8Z24_UNORM;
    case MESA_FORMAT_YCBCR:
       return PIPE_FORMAT_YCBCR;
    case MESA_FORMAT_RGB_DXT1:
@@ -559,10 +561,10 @@ translate_gallium_format_to_mesa_format(enum pipe_format format)
       return &_mesa_texformat_z16;
    case PIPE_FORMAT_Z32_UNORM:
       return &_mesa_texformat_z32;
-   case PIPE_FORMAT_S8Z24_UNORM:
-      /* XXX fallthrough OK? */
    case PIPE_FORMAT_Z24S8_UNORM:
       return &_mesa_texformat_z24_s8;
+   case PIPE_FORMAT_S8Z24_UNORM:
+      return &_mesa_texformat_s8_z24;
    case PIPE_FORMAT_YCBCR:
       return &_mesa_texformat_ycbcr;
    case PIPE_FORMAT_YCBCR_REV: