llvmpipe: implement the new can_create_resource() function

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>

diff --git a/src/gallium/drivers/llvmpipe/lp_texture.c b/src/gallium/drivers/llvmpipe/lp_texture.c
index 924881c..c0a612c 100644 (file)
--- a/src/gallium/drivers/llvmpipe/lp_texture.c
+++ b/src/gallium/drivers/llvmpipe/lp_texture.c
@@ -105,7 +105,8 @@ alloc_layout_array(unsigned num_slices, unsigned width, unsigned height)
  */
 static boolean
 llvmpipe_texture_layout(struct llvmpipe_screen *screen,
-                        struct llvmpipe_resource *lpr)
+                        struct llvmpipe_resource *lpr,
+                        boolean allocate)
 {
    struct pipe_resource *pt = &lpr->base;
    unsigned level;
@@ -163,9 +164,11 @@ llvmpipe_texture_layout(struct llvmpipe_screen *screen,
 
          lpr->num_slices_faces[level] = num_slices;
 
-         lpr->layout[level] = alloc_layout_array(num_slices, width, height);
-         if (!lpr->layout[level]) {
-            goto fail;
+         if (allocate) {
+            lpr->layout[level] = alloc_layout_array(num_slices, width, height);
+            if (!lpr->layout[level]) {
+               goto fail;
+            }
          }
       }
 
@@ -191,6 +194,20 @@ fail:
 }
 
 
+/**
+ * Check the size of the texture specified by 'res'.
+ * \return TRUE if OK, FALSE if too large.
+ */
+static boolean
+llvmpipe_can_create_resource(struct pipe_screen *screen,
+                             const struct pipe_resource *res)
+{
+   struct llvmpipe_resource lpr;
+   memset(&lpr, 0, sizeof(lpr));
+   lpr.base = *res;
+   return llvmpipe_texture_layout(llvmpipe_screen(screen), &lpr, FALSE);
+}
+
 
 static boolean
 llvmpipe_displaytarget_layout(struct llvmpipe_screen *screen,
@@ -264,7 +281,7 @@ llvmpipe_resource_create(struct pipe_screen *_screen,
       }
       else {
          /* texture map */
-         if (!llvmpipe_texture_layout(screen, lpr))
+         if (!llvmpipe_texture_layout(screen, lpr, TRUE))
             goto fail;
          assert(lpr->layout[0][0] == LP_TEX_LAYOUT_NONE);
       }
@@ -1436,6 +1453,7 @@ llvmpipe_init_screen_resource_funcs(struct pipe_screen *screen)
    screen->resource_destroy = llvmpipe_resource_destroy;
    screen->resource_from_handle = llvmpipe_resource_from_handle;
    screen->resource_get_handle = llvmpipe_resource_get_handle;
+   screen->can_create_resource = llvmpipe_can_create_resource;
 }