[Mesa-dev] [PATCH] i965: Fail to blit rather than assert on invalid pitch requirements.

[Kenneth Graunke]

Dungeon Defenders hits TexImage()'s try_pbo_upload() path where
image->Width == 2, which doesn't meet intelEmitCopyBlit's requirement
that the pitch needs to be a multiple of 4.

Since intelEmitCopyBlit can already fail for a myriad of other reasons,
and it's not clear that other callers are immune to this failure mode,
simply make it return false rather than assert.

Fixes Dungeon Defenders on i965/Ivybridge.  Now playable (aside from
having to work around the EXT_bindable_uniform issue).

NOTE: This is probably a candidate for the 9.0 branch.
---
 src/mesa/drivers/dri/intel/intel_blit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_blit.c b/src/mesa/drivers/dri/intel/intel_blit.c
index 521e6eb..867d7b3 100644
--- a/src/mesa/drivers/dri/intel/intel_blit.c
+++ b/src/mesa/drivers/dri/intel/intel_blit.c
@@ -150,8 +150,8 @@ intelEmitCopyBlit(struct intel_context *intel,
    /* Blit pitch must be dword-aligned.  Otherwise, the hardware appears to drop
     * the low bits.
     */
-   assert(src_pitch % 4 == 0);
-   assert(dst_pitch % 4 == 0);
+   if (src_pitch % 4 != 0 || dst_pitch % 4 != 0)
+      return false;
 
    /* For big formats (such as floating point), do the copy using 32bpp and
     * multiply the coordinates.
-- 
1.8.0.2