Mesa (master): r300g: support some exotic sampler formats

[Marek Olšák]

Module: Mesa
Branch: master
Commit: e1208bbeaeefd12a445cef84cbd12b7dc346531f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e1208bbeaeefd12a445cef84cbd12b7dc346531f

Author: Marek Olšák <maraeo at gmail.com>
Date:   Sun Apr 11 04:43:23 2010 +0200

r300g: support some exotic sampler formats

---

 src/gallium/drivers/r300/r300_reg.h     |    2 +-
 src/gallium/drivers/r300/r300_texture.c |   23 ++++++++++++++++-------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_reg.h b/src/gallium/drivers/r300/r300_reg.h
index bb87cc7..239f914 100644
--- a/src/gallium/drivers/r300/r300_reg.h
+++ b/src/gallium/drivers/r300/r300_reg.h
@@ -1543,7 +1543,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #	define R300_TX_FORMAT_DXT1	    	    0xF
 #	define R300_TX_FORMAT_DXT3	    	    0x10
 #	define R300_TX_FORMAT_DXT5	    	    0x11
-#	define R300_TX_FORMAT_Y8           	    0x12
+#	define R300_TX_FORMAT_CxV8U8           	    0x12
 #	define R300_TX_FORMAT_AVYU444 	    	    0x13
 #	define R300_TX_FORMAT_VYUY422  	    	    0x14
 #	define R300_TX_FORMAT_YVYU422  	    	    0x15
diff --git a/src/gallium/drivers/r300/r300_texture.c b/src/gallium/drivers/r300/r300_texture.c
index 4f1562d..8ed28eb 100644
--- a/src/gallium/drivers/r300/r300_texture.c
+++ b/src/gallium/drivers/r300/r300_texture.c
@@ -99,12 +99,6 @@ uint32_t r300_translate_texformat(enum pipe_format format,
         R300_TX_FORMAT_SIGNED_W,
     };
 
-    /* This is truly a special format.
-     * It stores R8G8 and B is computed using sqrt(1 - R^2 - G^2). */
-    if (format == PIPE_FORMAT_R8G8Bx_SNORM) {
-        return ~0; /* Unsupported. */
-    }
-
     desc = util_format_description(format);
 
     /* Colorspace (return non-RGB formats directly). */
@@ -139,7 +133,15 @@ uint32_t r300_translate_texformat(enum pipe_format format,
             result |= R300_TX_FORMAT_GAMMA;
             break;
 
-        default:;
+        default:
+            switch (format) {
+                /* Same as YUV but without the YUR->RGB conversion. */
+                case PIPE_FORMAT_R8G8_B8G8_UNORM:
+                    return R300_EASY_TX_FORMAT(X, Y, Z, ONE, YVYU422) | result;
+                case PIPE_FORMAT_G8R8_G8B8_UNORM:
+                    return R300_EASY_TX_FORMAT(X, Y, Z, ONE, VYUY422) | result;
+                default:;
+            }
     }
 
     /* Add swizzle. */
@@ -213,6 +215,13 @@ uint32_t r300_translate_texformat(enum pipe_format format,
         }
     }
 
+    /* This is truly a special format.
+     * It stores R8G8 and B is computed using sqrt(1 - R^2 - G^2)
+     * in the sampler unit. Also known as D3DFMT_CxV8U8. */
+    if (format == PIPE_FORMAT_R8G8Bx_SNORM) {
+        return R300_TX_FORMAT_CxV8U8 | result;
+    }
+
     /* RGTC formats. */
     if (desc->layout == UTIL_FORMAT_LAYOUT_RGTC) {
         switch (format) {