Mesa (master): Revert "util: Revert unsolicited, untested, unreviewed, and broken changes to format support."

Luca Barbieri lb at kemper.freedesktop.org
Sat Apr 3 01:36:15 UTC 2010


Module: Mesa
Branch: master
Commit: b7cd155263932f0abc0f1812bcc48c0348ff8da1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b7cd155263932f0abc0f1812bcc48c0348ff8da1

Author: Luca Barbieri <luca at luca-barbieri.com>
Date:   Sat Apr  3 02:12:51 2010 +0200

Revert "util: Revert unsolicited, untested, unreviewed, and broken changes to format support."

This reverts commit 47e61426586bb9f9f40950e9c4372e4f12bb9ed6.

---

 progs/gallium/unit/u_format_test.c           |    8 +-
 src/gallium/auxiliary/util/u_format.c        |    3 +-
 src/gallium/auxiliary/util/u_format.h        |   22 +++
 src/gallium/auxiliary/util/u_format_s3tc.c   |  262 ++++++++++++++++----------
 src/gallium/auxiliary/util/u_format_s3tc.h   |    4 +-
 src/gallium/auxiliary/util/u_format_table.py |    3 +-
 src/gallium/auxiliary/util/u_inline_init.h   |   15 ++
 src/gallium/drivers/nv50/nv50_context.c      |    1 +
 src/gallium/drivers/softpipe/sp_screen.c     |   23 +--
 9 files changed, 205 insertions(+), 136 deletions(-)

diff --git a/progs/gallium/unit/u_format_test.c b/progs/gallium/unit/u_format_test.c
index 53e0284..8dffaf4 100644
--- a/progs/gallium/unit/u_format_test.c
+++ b/progs/gallium/unit/u_format_test.c
@@ -30,10 +30,8 @@
 #include <stdio.h>
 #include <float.h>
 
-#include "util/u_half.h"
 #include "util/u_format.h"
 #include "util/u_format_tests.h"
-#include "util/u_format_s3tc.h"
 
 
 static boolean
@@ -354,10 +352,8 @@ test_one(test_func_t func, const char *suffix)
 
       format_desc = util_format_description(test->format);
 
-      if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC &&
-          !util_format_s3tc_enabled) {
+      if (!util_format_is_supported(test->format))
          skip = TRUE;
-      }
 
       if (test->format != last_format) {
          printf("%s util_format_%s_%s ...\n",
@@ -404,8 +400,6 @@ int main(int argc, char **argv)
 {
    boolean success;
 
-   util_format_s3tc_init();
-
    success = test_all();
 
    return success ? 0 : 1;
diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index 7f16cf7..112490f 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -33,6 +33,8 @@
  */
 
 #include "u_format.h"
+#include "u_format_s3tc.h"
+#include "u_half.h"
 
 
 void
@@ -115,4 +117,3 @@ util_format_write_4ub(enum pipe_format format, const uint8_t *src, unsigned src_
 
    format_desc->pack_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
 }
-
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 93818a3..2ac3aba 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -32,6 +32,7 @@
 
 #include "pipe/p_format.h"
 #include "util/u_debug.h"
+#include "util/u_format_s3tc.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -168,6 +169,13 @@ struct util_format_description
    unsigned is_mixed:1;
 
    /**
+    * Whether the pack/unpack functions actually work.
+    *
+    * Call util_format_is_supported instead of using this directly.
+    */
+   unsigned is_supported:1;
+
+   /**
     * Input channel description.
     *
     * Only valid for UTIL_FORMAT_LAYOUT_PLAIN formats.
@@ -506,6 +514,20 @@ util_format_get_nr_components(enum pipe_format format)
  * Format access functions.
  */
 
+static INLINE boolean
+util_format_is_supported(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   if(!desc)
+      return FALSE;
+
+   if(desc->layout == UTIL_FORMAT_LAYOUT_S3TC)
+      util_format_s3tc_init();
+
+   return desc->is_supported;
+}
+
 void
 util_format_read_4f(enum pipe_format format,
                     float *dst, unsigned dst_stride, 
diff --git a/src/gallium/auxiliary/util/u_format_s3tc.c b/src/gallium/auxiliary/util/u_format_s3tc.c
index 268f0e8..d48551f 100644
--- a/src/gallium/auxiliary/util/u_format_s3tc.c
+++ b/src/gallium/auxiliary/util/u_format_s3tc.c
@@ -34,59 +34,129 @@
 #define DXTN_LIBNAME "libtxc_dxtn.so"
 #endif
 
+static void
+util_format_dxt1_rgb_fetch_stub( int src_stride,
+                             const uint8_t *src,
+                             int col, int row,
+                             uint8_t *dst )
+{
+   util_format_s3tc_init();
+   util_format_dxt1_rgb_fetch(src_stride, src, col, row, dst);
+}
 
-boolean util_format_s3tc_enabled = FALSE;
-
-util_format_dxtn_fetch_t util_format_dxt1_rgb_fetch = NULL;
-util_format_dxtn_fetch_t util_format_dxt1_rgba_fetch = NULL;
-util_format_dxtn_fetch_t util_format_dxt3_rgba_fetch = NULL;
-util_format_dxtn_fetch_t util_format_dxt5_rgba_fetch = NULL;
+static void
+util_format_dxt1_rgba_fetch_stub( int src_stride,
+                             const uint8_t *src,
+                             int col, int row,
+                             uint8_t *dst )
+{
+   util_format_s3tc_init();
+   util_format_dxt1_rgba_fetch(src_stride, src, col, row, dst);
+}
 
-util_format_dxtn_pack_t util_format_dxtn_pack = NULL;
+static void
+util_format_dxt3_rgba_fetch_stub( int src_stride,
+                             const uint8_t *src,
+                             int col, int row,
+                             uint8_t *dst )
+{
+   util_format_s3tc_init();
+   util_format_dxt3_rgba_fetch(src_stride, src, col, row, dst);
+}
 
+static void
+util_format_dxt5_rgba_fetch_stub( int src_stride,
+                             const uint8_t *src,
+                             int col, int row,
+                             uint8_t *dst )
+{
+   util_format_s3tc_init();
+   util_format_dxt5_rgba_fetch(src_stride, src, col, row, dst);
+}
 
-void
-util_format_s3tc_init(void)
+static
+void util_format_dxtn_pack_stub( int src_comps,
+                            int width, int height,
+                            const uint8_t *src,
+                            enum util_format_dxtn dst_format,
+                            uint8_t *dst,
+                            int dst_stride)
 {
-   static struct util_dl_library *
-   library = NULL;
+   util_format_s3tc_init();
+   util_format_dxtn_pack_stub(src_comps, width, height, src, dst_format, dst, dst_stride);
+}
 
-   if (util_format_s3tc_enabled)
-      return;
+boolean util_format_s3tc_inited = FALSE;
 
-   if (!library) {
-      library = util_dl_open(DXTN_LIBNAME);
-      if (!library) {
-	 debug_printf("couldn't open " DXTN_LIBNAME ", software DXTn "
-	    "compression/decompression unavailable");
-      }
-      else {
-         util_format_dxt1_rgb_fetch = (util_format_dxtn_fetch_t)
-            util_dl_get_proc_address(library, "fetch_2d_texel_rgb_dxt1");
-         util_format_dxt1_rgba_fetch = (util_format_dxtn_fetch_t)
-            util_dl_get_proc_address(library, "fetch_2d_texel_rgba_dxt1");
-         util_format_dxt3_rgba_fetch = (util_format_dxtn_fetch_t)
-            util_dl_get_proc_address(library, "fetch_2d_texel_rgba_dxt3");
-         util_format_dxt5_rgba_fetch = (util_format_dxtn_fetch_t)
-            util_dl_get_proc_address(library, "fetch_2d_texel_rgba_dxt5");
-         util_format_dxtn_pack = (util_format_dxtn_pack_t)
-            util_dl_get_proc_address(library, "tx_compress_dxtn");
-
-         if (util_format_dxt1_rgb_fetch ||
-             util_format_dxt1_rgba_fetch ||
-             util_format_dxt3_rgba_fetch ||
-             util_format_dxt5_rgba_fetch ||
-             util_format_dxtn_pack) {
-            util_format_s3tc_enabled = TRUE;
-            debug_printf("software DXTn compression/decompression available");
-
-         } else {
-	    debug_printf("couldn't reference all symbols in "
-	       DXTN_LIBNAME ", software DXTn compression/decompression "
-	       "unavailable");
-         }
-      }
+util_format_dxtn_fetch_t util_format_dxt1_rgb_fetch = util_format_dxt1_rgb_fetch_stub;
+util_format_dxtn_fetch_t util_format_dxt1_rgba_fetch = util_format_dxt1_rgba_fetch_stub;
+util_format_dxtn_fetch_t util_format_dxt3_rgba_fetch = util_format_dxt3_rgba_fetch_stub;
+util_format_dxtn_fetch_t util_format_dxt5_rgba_fetch = util_format_dxt5_rgba_fetch_stub;
+
+util_format_dxtn_pack_t util_format_dxtn_pack = util_format_dxtn_pack_stub;
+
+static void
+nop(void)
+{}
+
+#define is_nop(f) ((void*)(f) == (void*)nop)
+
+static util_dl_proc
+get_proc_address_or_nop(struct util_dl_library *library,
+                         const char *procname)
+{
+   if(library) {
+      util_dl_proc proc = util_dl_get_proc_address(library, procname);
+      if(proc)
+         return proc;
+   }
+   return (util_dl_proc)nop;
+}
+
+void
+util_format_s3tc_do_init(void)
+{
+   struct util_dl_library *library;
+
+   library = util_dl_open(DXTN_LIBNAME);
+   util_format_dxt1_rgb_fetch = (util_format_dxtn_fetch_t)
+      get_proc_address_or_nop(library, "fetch_2d_texel_rgb_dxt1");
+   util_format_dxt1_rgba_fetch = (util_format_dxtn_fetch_t)
+      get_proc_address_or_nop(library, "fetch_2d_texel_rgba_dxt1");
+   util_format_dxt3_rgba_fetch = (util_format_dxtn_fetch_t)
+      get_proc_address_or_nop(library, "fetch_2d_texel_rgba_dxt3");
+   util_format_dxt5_rgba_fetch = (util_format_dxtn_fetch_t)
+      get_proc_address_or_nop(library, "fetch_2d_texel_rgba_dxt5");
+   util_format_dxtn_pack = (util_format_dxtn_pack_t)
+      get_proc_address_or_nop(library, "tx_compress_dxtn");
+
+   if (!library)
+      debug_printf("couldn't open " DXTN_LIBNAME ", software DXTn "
+         "compression/decompression unavailable\n");
+   else {
+      if (!is_nop(util_format_dxt1_rgb_fetch) &&
+         !is_nop(util_format_dxt1_rgba_fetch) &&
+         !is_nop(util_format_dxt3_rgba_fetch) &&
+         !is_nop(util_format_dxt5_rgba_fetch) &&
+         !is_nop(util_format_dxtn_pack)) {
+         debug_printf("software DXTn compression/decompression available\n");
+      } else
+         debug_printf("couldn't reference all symbols in "
+                 DXTN_LIBNAME ", software DXTn compression/decompression "
+                 "unavailable or partially available\n");
    }
+
+#define DO(n, a, A) \
+  ((struct util_format_description *)util_format_description(PIPE_FORMAT_DXT##n##_SRGB##A))->is_supported = \
+         ((struct util_format_description *)util_format_description(PIPE_FORMAT_DXT##n##_RGB##A))->is_supported = \
+               !is_nop(util_format_dxt##n##_rgb##a##_fetch);
+
+  DO(1,,);
+  DO(1,a,A);
+  DO(3,a,A);
+  DO(5,a,A);
+
+#undef DO
 }
 
 
@@ -97,85 +167,69 @@ util_format_s3tc_init(void)
 void
 util_format_dxt1_rgb_fetch_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt1_rgb_fetch) {
-      util_format_dxt1_rgb_fetch(0, src, i, j, dst);
-   }
+   util_format_dxt1_rgb_fetch(0, src, i, j, dst);
 }
 
 void
 util_format_dxt1_rgba_fetch_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt1_rgba_fetch) {
-      util_format_dxt1_rgba_fetch(0, src, i, j, dst);
-   }
+   util_format_dxt1_rgba_fetch(0, src, i, j, dst);
 }
 
 void
 util_format_dxt3_rgba_fetch_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt3_rgba_fetch) {
-      util_format_dxt3_rgba_fetch(0, src, i, j, dst);
-   }
+   util_format_dxt3_rgba_fetch(0, src, i, j, dst);
 }
 
 void
 util_format_dxt5_rgba_fetch_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt5_rgba_fetch) {
-      util_format_dxt5_rgba_fetch(0, src, i, j, dst);
-   }
+   util_format_dxt5_rgba_fetch(0, src, i, j, dst);
 }
 
 void
 util_format_dxt1_rgb_fetch_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt1_rgb_fetch) {
-      uint8_t tmp[4];
-      util_format_dxt1_rgb_fetch(0, src, i, j, tmp);
-      dst[0] = ubyte_to_float(tmp[0]);
-      dst[1] = ubyte_to_float(tmp[1]);
-      dst[2] = ubyte_to_float(tmp[2]);
-      dst[3] = 1.0;
-   }
+   uint8_t tmp[4];
+   util_format_dxt1_rgb_fetch(0, src, i, j, tmp);
+   dst[0] = ubyte_to_float(tmp[0]);
+   dst[1] = ubyte_to_float(tmp[1]);
+   dst[2] = ubyte_to_float(tmp[2]);
+   dst[3] = 1.0;
 }
 
 void
 util_format_dxt1_rgba_fetch_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt1_rgba_fetch) {
-      uint8_t tmp[4];
-      util_format_dxt1_rgba_fetch(0, src, i, j, tmp);
-      dst[0] = ubyte_to_float(tmp[0]);
-      dst[1] = ubyte_to_float(tmp[1]);
-      dst[2] = ubyte_to_float(tmp[2]);
-      dst[3] = ubyte_to_float(tmp[3]);
-   }
+   uint8_t tmp[4];
+   util_format_dxt1_rgba_fetch(0, src, i, j, tmp);
+   dst[0] = ubyte_to_float(tmp[0]);
+   dst[1] = ubyte_to_float(tmp[1]);
+   dst[2] = ubyte_to_float(tmp[2]);
+   dst[3] = ubyte_to_float(tmp[3]);
 }
 
 void
 util_format_dxt3_rgba_fetch_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt3_rgba_fetch) {
-      uint8_t tmp[4];
-      util_format_dxt3_rgba_fetch(0, src, i, j, tmp);
-      dst[0] = ubyte_to_float(tmp[0]);
-      dst[1] = ubyte_to_float(tmp[1]);
-      dst[2] = ubyte_to_float(tmp[2]);
-      dst[3] = ubyte_to_float(tmp[3]);
-   }
+   uint8_t tmp[4];
+   util_format_dxt3_rgba_fetch(0, src, i, j, tmp);
+   dst[0] = ubyte_to_float(tmp[0]);
+   dst[1] = ubyte_to_float(tmp[1]);
+   dst[2] = ubyte_to_float(tmp[2]);
+   dst[3] = ubyte_to_float(tmp[3]);
 }
 
 void
 util_format_dxt5_rgba_fetch_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
 {
-   if (util_format_dxt5_rgba_fetch) {
-      uint8_t tmp[4];
-      util_format_dxt5_rgba_fetch(0, src, i, j, tmp);
-      dst[0] = ubyte_to_float(tmp[0]);
-      dst[1] = ubyte_to_float(tmp[1]);
-      dst[2] = ubyte_to_float(tmp[2]);
-      dst[3] = ubyte_to_float(tmp[3]);
-   }
+   uint8_t tmp[4];
+   util_format_dxt5_rgba_fetch(0, src, i, j, tmp);
+   dst[0] = ubyte_to_float(tmp[0]);
+   dst[1] = ubyte_to_float(tmp[1]);
+   dst[2] = ubyte_to_float(tmp[2]);
+   dst[3] = ubyte_to_float(tmp[3]);
 }
 
 
@@ -186,7 +240,7 @@ util_format_dxt5_rgba_fetch_float(float *dst, const uint8_t *src, unsigned i, un
 void
 util_format_dxt1_rgb_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt1_rgb_fetch) {
+   if (!is_nop(util_format_dxt1_rgb_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -207,7 +261,7 @@ util_format_dxt1_rgb_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const
 void
 util_format_dxt1_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt1_rgba_fetch) {
+   if (!is_nop(util_format_dxt1_rgba_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -228,7 +282,7 @@ util_format_dxt1_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const
 void
 util_format_dxt3_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt3_rgba_fetch) {
+   if (!is_nop(util_format_dxt3_rgba_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -249,7 +303,7 @@ util_format_dxt3_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const
 void
 util_format_dxt5_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt5_rgba_fetch) {
+   if (is_nop(util_format_dxt5_rgba_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -270,7 +324,7 @@ util_format_dxt5_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const
 void
 util_format_dxt1_rgb_unpack_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt1_rgb_fetch) {
+   if (is_nop(util_format_dxt1_rgb_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -296,7 +350,7 @@ util_format_dxt1_rgb_unpack_float(float *dst_row, unsigned dst_stride, const uin
 void
 util_format_dxt1_rgba_unpack_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt1_rgba_fetch) {
+   if (!is_nop(util_format_dxt1_rgba_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -322,7 +376,7 @@ util_format_dxt1_rgba_unpack_float(float *dst_row, unsigned dst_stride, const ui
 void
 util_format_dxt3_rgba_unpack_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt3_rgba_fetch) {
+   if (!is_nop(util_format_dxt3_rgba_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -348,7 +402,7 @@ util_format_dxt3_rgba_unpack_float(float *dst_row, unsigned dst_stride, const ui
 void
 util_format_dxt5_rgba_unpack_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxt5_rgba_fetch) {
+   if (!is_nop(util_format_dxt5_rgba_fetch)) {
       unsigned x, y, i, j;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -379,7 +433,7 @@ util_format_dxt5_rgba_unpack_float(float *dst_row, unsigned dst_stride, const ui
 void
 util_format_dxt1_rgb_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -406,7 +460,7 @@ util_format_dxt1_rgb_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const ui
 void
 util_format_dxt1_rgba_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -433,7 +487,7 @@ util_format_dxt1_rgba_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const u
 void
 util_format_dxt3_rgba_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -460,7 +514,7 @@ util_format_dxt3_rgba_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const u
 void
 util_format_dxt5_rgba_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const uint8_t *src = src_row;
@@ -487,7 +541,7 @@ util_format_dxt5_rgba_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const u
 void
 util_format_dxt1_rgb_pack_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const float *src = src_row;
@@ -514,7 +568,7 @@ util_format_dxt1_rgb_pack_float(uint8_t *dst_row, unsigned dst_stride, const flo
 void
 util_format_dxt1_rgba_pack_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const float *src = src_row;
@@ -541,7 +595,7 @@ util_format_dxt1_rgba_pack_float(uint8_t *dst_row, unsigned dst_stride, const fl
 void
 util_format_dxt3_rgba_pack_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const float *src = src_row;
@@ -568,7 +622,7 @@ util_format_dxt3_rgba_pack_float(uint8_t *dst_row, unsigned dst_stride, const fl
 void
 util_format_dxt5_rgba_pack_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-   if (util_format_dxtn_pack) {
+   if (!is_nop(util_format_dxtn_pack)) {
       unsigned x, y, i, j, k;
       for(y = 0; y < height; y += 4) {
          const float *src = src_row;
diff --git a/src/gallium/auxiliary/util/u_format_s3tc.h b/src/gallium/auxiliary/util/u_format_s3tc.h
index 5c3a9dd..da14b9b 100644
--- a/src/gallium/auxiliary/util/u_format_s3tc.h
+++ b/src/gallium/auxiliary/util/u_format_s3tc.h
@@ -31,6 +31,7 @@
 
 
 #include "pipe/p_compiler.h"
+#include "util/u_inline_init.h"
 
 
 enum util_format_dxtn {
@@ -65,8 +66,7 @@ extern util_format_dxtn_fetch_t util_format_dxt5_rgba_fetch;
 extern util_format_dxtn_pack_t util_format_dxtn_pack;
 
 
-void
-util_format_s3tc_init(void);
+UTIL_INLINE_INIT(util_format_s3tc)
 
 
 void
diff --git a/src/gallium/auxiliary/util/u_format_table.py b/src/gallium/auxiliary/util/u_format_table.py
index 94a4331..2c0c9bf 100755
--- a/src/gallium/auxiliary/util/u_format_table.py
+++ b/src/gallium/auxiliary/util/u_format_table.py
@@ -92,7 +92,7 @@ def write_format_table(formats):
     u_format_pack.generate(formats)
     
     for format in formats:
-        print 'const struct util_format_description'
+        print 'struct util_format_description'
         print 'util_format_%s_description = {' % (format.short_name(),)
         print "   %s," % (format.name,)
         print "   \"%s\"," % (format.name,)
@@ -103,6 +103,7 @@ def write_format_table(formats):
         print "   %s,\t/* is_array */" % (bool_map(format.is_array()),)
         print "   %s,\t/* is_bitmask */" % (bool_map(format.is_bitmask()),)
         print "   %s,\t/* is_mixed */" % (bool_map(format.is_mixed()),)
+        print "   %s,\t/* is_supported */" % ("TRUE" if u_format_pack.is_format_supported(format) else "FALSE",)
         print "   {"
         for i in range(4):
             channel = format.channels[i]
diff --git a/src/gallium/auxiliary/util/u_inline_init.h b/src/gallium/auxiliary/util/u_inline_init.h
new file mode 100644
index 0000000..2a1e775
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_inline_init.h
@@ -0,0 +1,15 @@
+#ifndef U_INLINE_INIT_H_
+#define U_INLINE_INIT_H_
+
+#define UTIL_INLINE_INIT(m) \
+   extern boolean m##_inited; \
+   extern void m##_do_init(void); \
+   static INLINE void m##_init(void) \
+   { \
+      if(!m##_inited) { \
+         m##_do_init(); \
+         m##_inited = TRUE; \
+      } \
+   }
+
+#endif /* U_INLINE_INIT_H_ */
diff --git a/src/gallium/drivers/nv50/nv50_context.c b/src/gallium/drivers/nv50/nv50_context.c
index aa14e17..92b194a 100644
--- a/src/gallium/drivers/nv50/nv50_context.c
+++ b/src/gallium/drivers/nv50/nv50_context.c
@@ -22,6 +22,7 @@
 
 #include "draw/draw_context.h"
 #include "pipe/p_defines.h"
+#include "util/u_format.h"
 
 #include "nv50_context.h"
 #include "nv50_screen.h"
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index be64048..ddc53b3 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -27,6 +27,7 @@
 
 
 #include "util/u_memory.h"
+#include "util/u_format.h"
 #include "util/u_format_s3tc.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
@@ -155,25 +156,9 @@ softpipe_is_format_supported( struct pipe_screen *screen,
           target == PIPE_TEXTURE_3D ||
           target == PIPE_TEXTURE_CUBE);
 
-   switch(format) {
-   case PIPE_FORMAT_YUYV:
-   case PIPE_FORMAT_UYVY:
+   if(!util_format_is_supported(format))
       return FALSE;
 
-   case PIPE_FORMAT_DXT1_RGB:
-   case PIPE_FORMAT_DXT1_RGBA:
-   case PIPE_FORMAT_DXT3_RGBA:
-   case PIPE_FORMAT_DXT5_RGBA:
-      return util_format_s3tc_enabled;
-
-   case PIPE_FORMAT_Z32_FLOAT:
-   case PIPE_FORMAT_NONE:
-      return FALSE;
-
-   default:
-      break;
-   }
-
    if(tex_usage & (PIPE_TEXTURE_USAGE_DISPLAY_TARGET |
                    PIPE_TEXTURE_USAGE_SCANOUT |
                    PIPE_TEXTURE_USAGE_SHARED)) {
@@ -181,8 +166,6 @@ softpipe_is_format_supported( struct pipe_screen *screen,
          return FALSE;
    }
 
-   /* XXX: this is often a lie.  Pull in logic from llvmpipe to fix.
-    */
    return TRUE;
 }
 
@@ -241,8 +224,6 @@ softpipe_create_screen(struct sw_winsys *winsys)
    screen->base.context_create = softpipe_create_context;
    screen->base.flush_frontbuffer = softpipe_flush_frontbuffer;
 
-   util_format_s3tc_init();
-
    softpipe_init_screen_texture_funcs(&screen->base);
    softpipe_init_screen_buffer_funcs(&screen->base);
    softpipe_init_screen_fence_funcs(&screen->base);




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