EXA: Wait for sync before we set up new state in our static state buffers.

src/i965_exa_render.c

@@ -404,6 +404,9 @@ I965EXAPrepareComposite(int op, PicturePtr pSrcPicture,
 
    binding_table_entries = 2; /* default no mask */
 
+   /* Wait for sync before we start setting up our new state */
+   i830WaitSync(pScrn);
+
    /* Set up our layout of state in framebuffer.  First the general state: */
    next_offset = 0;
    vs_offset = ALIGN(next_offset, 64);
@@ -1024,6 +1027,11 @@ I965EXAComposite(PixmapPtr pDst, int srcX, int srcY, int maskX, int maskY,
 		"dstX %d, dstY %d\n", srcX, srcY, srcXend, srcYend,
 		maskX, maskY, maskXend, maskYend, dstX, dstY);
 
+    /* Wait for any existing composite rectangles to land before we overwrite
+     * the VB with the next one.
+     */
+    i830WaitSync(pScrn);
+
     i = 0;
     /* rect (x2,y2) */
     vb[i++] = (float)(srcXend) / pI830->scale_units[0][0];
@@ -1088,4 +1096,9 @@ I965EXAComposite(PixmapPtr pDst, int srcX, int srcY, int maskX, int maskY,
    	OUT_RING(0); /* Immediate data high DW */
 	ADVANCE_LP_RING();
     }
+
+    /* Mark sync so we can wait for it before setting up the VB on the next
+     * rectangle.
+     */
+    i830MarkSync(pScrn);
 }