Mesa (master): r300g: add one more ZTOP disable bit.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: ce5cba040c34a1a70186c29a5055e9be3c85a54a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ce5cba040c34a1a70186c29a5055e9be3c85a54a

Author: Dave Airlie <airlied at redhat.com>
Date:   Wed Oct 14 18:05:14 2009 +1000

r300g: add one more ZTOP disable bit.

Still missing the frag uses kill support, hopefully nha can point that out.

---

 src/gallium/drivers/r300/r300_fs.h    |    6 ++++++
 src/gallium/drivers/r300/r300_state.c |    4 +++-
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_fs.h b/src/gallium/drivers/r300/r300_fs.h
index 967e9f6..0445327 100644
--- a/src/gallium/drivers/r300/r300_fs.h
+++ b/src/gallium/drivers/r300/r300_fs.h
@@ -48,4 +48,10 @@ struct r300_fragment_shader {
 void r300_translate_fragment_shader(struct r300_context* r300,
                                     struct r300_fragment_shader* fs);
 
+static inline boolean r300_fragment_shader_writes_depth(struct r300_fragment_shader *fs)
+{
+    if (!fs)
+	return FALSE;
+    return (fs->code.writes_depth) ? TRUE : FALSE;
+}
 #endif /* R300_FS_H */
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index d8533ac..95e2943 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -252,9 +252,11 @@ static void*
 
     dsa->z_buffer_top = R300_ZTOP_ENABLE;
     /* XXX TODO: add frag prog rules for ztop disable */
+    if (r300_fragment_shader_writes_depth(r300->fs))
+	dsa->z_buffer_top = R300_ZTOP_DISABLE;
     if (state->alpha.enabled && state->alpha.func != PIPE_FUNC_ALWAYS)
 	dsa->z_buffer_top = R300_ZTOP_DISABLE;
-    if (!is_empty_list(&r300->query_list))
+    if (r300->query_current)
 	dsa->z_buffer_top = R300_ZTOP_DISABLE;
 
     return (void*)dsa;