r300g: implement fast color clear

An initial implementation made by Dave Airlie.

For it to be used, a color-only clear must be invoked and exactly one
point-sampled render target must be set. The render target must be
macrotiled (for us to overcome alignment issues) and bpp must be either
16 or 32.

I can't see a difference in performance. :(

Conflicts:

	src/gallium/drivers/r300/r300_blit.c

1 files changed, 19 insertions, 0 deletions

diff --git a/src/gallium/drivers/r300/r300_hyperz.c b/src/gallium/drivers/r300/r300_hyperz.c
index 2c4e6c7211..e952895601 100644
--- a/src/gallium/drivers/r300/r300_hyperz.c
+++ b/src/gallium/drivers/r300/r300_hyperz.c
@@ -27,6 +27,22 @@
 #include "r300_fs.h"
 
 /*****************************************************************************/
+/* The HyperZ setup                                                          */
+/*****************************************************************************/
+
+static void r300_update_hyperz(struct r300_context* r300)
+{
+    struct r300_hyperz_state *z =
+        (struct r300_hyperz_state*)r300->hyperz_state.state;
+
+    z->zb_bw_cntl = 0;
+    z->sc_hyperz = R300_SC_HYPERZ_ADJ_2;
+
+    if (r300->cbzb_clear)
+        z->zb_bw_cntl |= R300_ZB_CB_CLEAR_CACHE_LINE_WRITE_ONLY;
+}
+
+/*****************************************************************************/
 /* The ZTOP state                                                            */
 /*****************************************************************************/
 
@@ -118,4 +134,7 @@ static void r300_update_ztop(struct r300_context* r300)
 void r300_update_hyperz_state(struct r300_context* r300)
 {
     r300_update_ztop(r300);
+    if (r300->hyperz_state.dirty) {
+        r300_update_hyperz(r300);
+    }
 }