Mesa (7.9): r300g: fix texture border color for all texture formats

[Marek Olšák]

Module: Mesa
Branch: 7.9
Commit: 62f2b7e7594233518aa67f25d68e158b6a31f452
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=62f2b7e7594233518aa67f25d68e158b6a31f452

Author: Marek Olšák <maraeo at gmail.com>
Date:   Sat Nov 13 16:43:20 2010 +0100

r300g: fix texture border color for all texture formats

This fixes 8 texwrap format tests.
The code should handle arbitrary formats now and is cleaner.

NOTE: This is a candidate for the 7.9 branch.
(cherry picked from commit 7e2256688afdc9506fe5cddd4ad46872671cbc23)

---

 src/gallium/drivers/r300/r300_state_derived.c |   63 ++++++++++++-------------
 1 files changed, 31 insertions(+), 32 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_state_derived.c b/src/gallium/drivers/r300/r300_state_derived.c
index 253342c..afd154f 100644
--- a/src/gallium/drivers/r300/r300_state_derived.c
+++ b/src/gallium/drivers/r300/r300_state_derived.c
@@ -25,6 +25,7 @@
 
 #include "util/u_math.h"
 #include "util/u_memory.h"
+#include "util/u_pack_color.h"
 
 #include "r300_context.h"
 #include "r300_fs.h"
@@ -571,58 +572,56 @@ static uint32_t r300_get_border_color(enum pipe_format format,
                                       const float border[4])
 {
     const struct util_format_description *desc;
-    float border_swizzled[4] = {
-        border[2],
-        border[1],
-        border[0],
-        border[3]
-    };
-    uint32_t r;
+    float border_swizzled[4] = {0};
+    unsigned i;
+    union util_color uc = {0};
 
     desc = util_format_description(format);
 
-    /* We don't use util_pack_format because it does not handle the formats
-     * we want, e.g. R4G4B4A4 is non-existent in Gallium. */
+    /* Apply inverse swizzle of the format. */
+    for (i = 0; i < 4; i++) {
+        switch (desc->swizzle[i]) {
+        case UTIL_FORMAT_SWIZZLE_X:
+            border_swizzled[2] = border[i];
+            break;
+        case UTIL_FORMAT_SWIZZLE_Y:
+            border_swizzled[1] = border[i];
+            break;
+        case UTIL_FORMAT_SWIZZLE_Z:
+            border_swizzled[0] = border[i];
+            break;
+        case UTIL_FORMAT_SWIZZLE_W:
+            border_swizzled[3] = border[i];
+            break;
+        }
+    }
+
     switch (desc->channel[0].size) {
         case 4:
-            r = ((float_to_ubyte(border_swizzled[0]) & 0xf0) >> 4) |
-                ((float_to_ubyte(border_swizzled[1]) & 0xf0) << 0) |
-                ((float_to_ubyte(border_swizzled[2]) & 0xf0) << 4) |
-                ((float_to_ubyte(border_swizzled[3]) & 0xf0) << 8);
+            util_pack_color(border_swizzled, PIPE_FORMAT_B4G4R4A4_UNORM, &uc);
             break;
 
         case 5:
             if (desc->channel[1].size == 5) {
-                r = ((float_to_ubyte(border_swizzled[0]) & 0xf8) >> 3) |
-                    ((float_to_ubyte(border_swizzled[1]) & 0xf8) << 2) |
-                    ((float_to_ubyte(border_swizzled[2]) & 0xf8) << 7) |
-                    ((float_to_ubyte(border_swizzled[3]) & 0x80) << 8);
+                util_pack_color(border_swizzled, PIPE_FORMAT_B5G5R5A1_UNORM, &uc);
             } else if (desc->channel[1].size == 6) {
-                r = ((float_to_ubyte(border_swizzled[0]) & 0xf8) >> 3) |
-                    ((float_to_ubyte(border_swizzled[1]) & 0xfc) << 3) |
-                    ((float_to_ubyte(border_swizzled[2]) & 0xf8) << 8);
+                util_pack_color(border_swizzled, PIPE_FORMAT_B5G6R5_UNORM, &uc);
             } else {
                 assert(0);
             }
             break;
 
-        case 16:
-            r = ((float_to_ubyte(border_swizzled[2]) & 0xff) << 0) |
-                ((float_to_ubyte(border_swizzled[1]) & 0xff) << 8) |
-                ((float_to_ubyte(border_swizzled[0]) & 0xff) << 16) |
-                ((float_to_ubyte(border_swizzled[3]) & 0xff) << 24);
+        default:
+        case 8:
+            util_pack_color(border_swizzled, PIPE_FORMAT_B8G8R8A8_UNORM, &uc);
             break;
 
-        case 8:
-        default:
-            r = ((float_to_ubyte(border_swizzled[0]) & 0xff) << 0) |
-                ((float_to_ubyte(border_swizzled[1]) & 0xff) << 8) |
-                ((float_to_ubyte(border_swizzled[2]) & 0xff) << 16) |
-                ((float_to_ubyte(border_swizzled[3]) & 0xff) << 24);
+        case 10:
+            util_pack_color(border_swizzled, PIPE_FORMAT_B10G10R10A2_UNORM, &uc);
             break;
     }
 
-    return r;
+    return uc.ui;
 }
 
 static void r300_merge_textures_and_samplers(struct r300_context* r300)