intel: If a tex image doesn't fit in the object's tree, make a temporary tree.

Previously, we would just store the data as malloced memory hanging off the
object, which would get memcpyed in at validate time.  This broke an
oglconform render-to-texture test, since validate wasn't called but a miptree
was expected.

src/mesa/drivers/dri/intel/intel_tex_image.c

@@ -395,10 +395,25 @@ intelTexImage(GLcontext * ctx,
 
       intel_miptree_reference(&intelImage->mt, intelObj->mt);
       assert(intelImage->mt);
+   } else if (intelImage->base.Border == 0) {
+      int comp_byte = 0;
+
+      if (intelImage->base.IsCompressed) {
+	 comp_byte =
+	    intel_compressed_num_bytes(intelImage->base.TexFormat->MesaFormat);
       }
 
-   if (!intelImage->mt)
+      /* Didn't fit in the object miptree, but it's suitable for inclusion in
-      DBG("XXX: Image did not fit into tree - storing in local memory!\n");
+       * a miptree, so create one just for our level and store it in the image.
+       * It'll get moved into the object miptree at validate time.
+       */
+      intelImage->mt = intel_miptree_create(intel, target, internalFormat,
+					    level, level,
+					    width, height, depth,
+					    intelImage->base.TexFormat->TexelBytes,
+					    comp_byte);
+
+   }
 
    /* PBO fastpaths:
     */