r300g: reject resources from handles which are not large enough

The driver gets a buffer and its size in resource_from_handle.
It computes the required minimum buffer size from given texture
properties, and compares the two sizes.

This is to early detect DDX bugs.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/gallium/drivers/r300/r300_context.h b/src/gallium/drivers/r300/r300_context.h
index b9c96d5bdd..7b58587a2a 100644
--- a/src/gallium/drivers/r300/r300_context.h
+++ b/src/gallium/drivers/r300/r300_context.h
@@ -352,9 +352,14 @@ struct r300_texture {
      */
     unsigned stride_override;
 
-    /* Total size of this texture, in bytes. */
+    /* Total size of this texture, in bytes,
+     * derived from the texture properties. */
     unsigned size;
 
+    /* Total size of the buffer backing this texture, in bytes.
+     * It must be >= size. */
+    unsigned buffer_size;
+
     /* Whether this texture has non-power-of-two dimensions
      * or a user-specified pitch.
      * It can be either a regular texture or a rectangle one.