[Mesa-dev] [PATCH] nv50: only advertise PIPE_FORMAT_DXT* if s3tc available

[Xavier Chantry]

This fixes flightgear assertion in dxt stubs :
Mesa warning: external dxt library not available: texstore_rgba_dxt3
util/u_format_s3tc.c:66:util_format_dxt3_rgba_fetch_stub: Assertion `0'
failed.

Only advertise for BIND_SAMPLER_VIEW to avoid very weird paths, according to
José Fonseca.
---
 src/gallium/drivers/nouveau/nouveau_screen.c |    3 +++
 src/gallium/drivers/nv50/nv50_screen.c       |   16 ++++++++++++----
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/src/gallium/drivers/nouveau/nouveau_screen.c b/src/gallium/drivers/nouveau/nouveau_screen.c
index 233a91a..a91b00b 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.c
+++ b/src/gallium/drivers/nouveau/nouveau_screen.c
@@ -5,6 +5,7 @@
 #include "util/u_memory.h"
 #include "util/u_inlines.h"
 #include "util/u_format.h"
+#include "util/u_format_s3tc.h"
 
 #include <stdio.h>
 #include <errno.h>
@@ -248,6 +249,8 @@ nouveau_screen_init(struct nouveau_screen *screen, struct nouveau_device *dev)
 	pscreen->fence_signalled = nouveau_screen_fence_signalled;
 	pscreen->fence_finish = nouveau_screen_fence_finish;
 
+	util_format_s3tc_init();
+
 	return 0;
 }
 
diff --git a/src/gallium/drivers/nv50/nv50_screen.c b/src/gallium/drivers/nv50/nv50_screen.c
index 2dd1042..bf46ceb 100644
--- a/src/gallium/drivers/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nv50/nv50_screen.c
@@ -20,6 +20,7 @@
  * SOFTWARE.
  */
 
+#include "util/u_format_s3tc.h"
 #include "pipe/p_screen.h"
 
 #include "nv50_context.h"
@@ -60,6 +61,17 @@ nv50_screen_is_format_supported(struct pipe_screen *pscreen,
 			break;
 		}
 	} else {
+		if (tex_usage & PIPE_BIND_SAMPLER_VIEW) {
+			switch (format) {
+			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;
+			default:
+				break;
+			}
+		}
 		switch (format) {
 		case PIPE_FORMAT_B8G8R8A8_UNORM:
 		case PIPE_FORMAT_B8G8R8X8_UNORM:
@@ -72,10 +84,6 @@ nv50_screen_is_format_supported(struct pipe_screen *pscreen,
 		case PIPE_FORMAT_A8_UNORM:
 		case PIPE_FORMAT_I8_UNORM:
 		case PIPE_FORMAT_L8A8_UNORM:
-		case PIPE_FORMAT_DXT1_RGB:
-		case PIPE_FORMAT_DXT1_RGBA:
-		case PIPE_FORMAT_DXT3_RGBA:
-		case PIPE_FORMAT_DXT5_RGBA:
 		case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 		case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 		case PIPE_FORMAT_Z32_FLOAT:
-- 
1.7.1