From 0ea45b1ad822ebdce2af3faef77ed776ca32d46b Mon Sep 17 00:00:00 2001
From: Stephane Marchesin <marchesin@icps.u-strasbg.fr>
Date: Tue, 21 Nov 2006 12:43:16 +0000
Subject: Add the state caching mechanism. It seems to work, from what I can
 see.

---
 src/mesa/drivers/dri/nouveau/nouveau_state_cache.c | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/mesa/drivers/dri/nouveau/nouveau_state_cache.c

(limited to 'src/mesa/drivers/dri/nouveau/nouveau_state_cache.c')

diff --git a/src/mesa/drivers/dri/nouveau/nouveau_state_cache.c b/src/mesa/drivers/dri/nouveau/nouveau_state_cache.c
new file mode 100644
index 0000000000..36f0c1024b
--- /dev/null
+++ b/src/mesa/drivers/dri/nouveau/nouveau_state_cache.c
@@ -0,0 +1,64 @@
+
+#include "nouveau_state_cache.h"
+#include "nouveau_context.h"
+#include "nouveau_object.h"
+#include "nouveau_fifo.h"
+
+#define BEGIN_RING_NOFLUSH(subchannel,tag,size) do {					\
+	if (nmesa->fifo.free <= (size))							\
+		WAIT_RING(nmesa,(size));						\
+	OUT_RING( ((size)<<18) | ((subchannel) << 13) | (tag));				\
+	nmesa->fifo.free -= ((size) + 1);                                               \
+}while(0)
+
+// flush all the dirty state
+void nouveau_state_cache_flush(nouveauContextPtr nmesa)
+{
+	int i=0;
+	int run=0;
+
+	// fast-path no state changes
+	if (!nmesa->state_cache.dirty)
+		return;
+	nmesa->state_cache.dirty=0;
+
+	do
+	{
+		// jump to a dirty state
+		while((nmesa->state_cache.atoms[i].dirty==0)&&(i<NOUVEAU_STATE_CACHE_ENTRIES))
+			i++;
+
+		// figure out a run of dirty values
+		run=0;
+		while((nmesa->state_cache.atoms[i+run].dirty)&&(i+run<NOUVEAU_STATE_CACHE_ENTRIES))
+			run++;
+
+		// output everything as a single run
+		if (run>0) {
+			int j;
+
+			BEGIN_RING_NOFLUSH(NvSub3D, i*4, run);
+			for(j=0;j<run;j++)
+			{
+				OUT_RING(nmesa->state_cache.atoms[i+j].value);
+				nmesa->state_cache.atoms[i+j].dirty=0;
+			}
+			i+=run;
+		}
+	}
+	while(i<NOUVEAU_STATE_CACHE_ENTRIES);
+}
+
+
+// inits the state cache
+void nouveau_state_cache_init(nouveauContextPtr nmesa)
+{
+	int i;
+	for(i=0;i<NOUVEAU_STATE_CACHE_ENTRIES;i++)
+	{
+		nmesa->state_cache.atoms[i].dirty=0;
+		nmesa->state_cache.atoms[i].value=0xDEADBEEF; // nvidia cards like beef
+	}
+	nmesa->state_cache.dirty=0;
+}
+
-- 
cgit v1.2.3