r300g: log when getting unsupported texture format

src/gallium/drivers/r300/r300_state.c

@@ -1465,6 +1465,8 @@ r300_create_sampler_view(struct pipe_context *pipe,
     boolean dxtc_swizzle = r300_screen(pipe->screen)->caps.dxtc_swizzle;
 
     if (view) {
+        unsigned hwformat;
+
         view->base = *templ;
         view->base.reference.count = 1;
         view->base.context = pipe;
@@ -1476,11 +1478,19 @@ r300_create_sampler_view(struct pipe_context *pipe,
         view->swizzle[2] = templ->swizzle_b;
         view->swizzle[3] = templ->swizzle_a;
 
+        hwformat = r300_translate_texformat(templ->format,
+                                            view->swizzle,
+                                            is_r500,
+                                            dxtc_swizzle);
+
+        if (hwformat == ~0) {
+            fprintf(stderr, "r300: Ooops. Got unsupported format %s in %s.\n",
+                    util_format_short_name(templ->format), __func__);
+        }
+        assert(hwformat != ~0);
+
         view->format = tex->tx_format;
-        view->format.format1 |= r300_translate_texformat(templ->format,
-                                                         view->swizzle,
-                                                         is_r500,
-                                                         dxtc_swizzle);
+        view->format.format1 |= hwformat;
         if (is_r500) {
             view->format.format2 |= r500_tx_format_msb_bit(templ->format);
         }