[965] Replace various alignment code with a shared ALIGN() macro.

In the process, fix some alignment issues:
- Scratch space allocation was aligned into units of 1KB, while the allocation
  wanted units of bytes, so we never allocated enough space for scratch.
- GRF register count was programmed as ALIGN(val - 1, 16) / 16 instead of
  ALIGN(val, 16) / 16 - 1, which overcounted for val != 16n+1.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/intel_context.h b/src/mesa/drivers/dri/i965/intel_context.h
index f63c2f613d..65898caaa7 100644
--- a/src/mesa/drivers/dri/i965/intel_context.h
+++ b/src/mesa/drivers/dri/i965/intel_context.h
@@ -252,6 +252,8 @@ void UNLOCK_HARDWARE( struct intel_context *intel );
 #define SUBPIXEL_X 0.125
 #define SUBPIXEL_Y 0.125
 
+#define ALIGN(value, alignment)  ((value + alignment - 1) & ~(alignment - 1))
+
 /* ================================================================
  * Color packing:
  */