Mesa (master): softpipe: document MAX_QUADS

[Brian Paul]

Module: Mesa
Branch: master
Commit: b806c3056f17685c8e6214ce946cd282c656107a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b806c3056f17685c8e6214ce946cd282c656107a

Author: Brian Paul <brianp at vmware.com>
Date:   Sun Apr 18 08:51:16 2010 -0600

softpipe: document MAX_QUADS

---

 src/gallium/drivers/softpipe/sp_setup.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/softpipe/sp_setup.c b/src/gallium/drivers/softpipe/sp_setup.c
index e136cb7..42c254c 100644
--- a/src/gallium/drivers/softpipe/sp_setup.c
+++ b/src/gallium/drivers/softpipe/sp_setup.c
@@ -59,6 +59,11 @@ struct edge {
 };
 
 
+/**
+ * Max number of quads (2x2 pixel blocks) to process per batch.
+ * This can't be arbitrarily increased since we depend on some 32-bit
+ * bitmasks (two bits per quad).
+ */
 #define MAX_QUADS 16
 
 
@@ -204,7 +209,7 @@ static INLINE int block_x( int x )
  */
 static void flush_spans( struct setup_context *setup )
 {
-   const int step = 16;
+   const int step = MAX_QUADS;
    const int xleft0 = setup->span.left[0];
    const int xleft1 = setup->span.left[1];
    const int xright0 = setup->span.right[0];