svga: Condition preemptive flush on draw emission

On ultra high resolution modes, the preemptive flush flag can be
set midway through command submission, a condition that cannot be
recovered from a flush-retry, causing rendering artifacts.

This patch prevents a preemtive_flush until a draw has been
emitted.

Signed-off-by: Sinclair Yeh <[email protected]>
Reviewed-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Charmaine Lee <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_winsys.h b/src/gallium/drivers/svga/svga_winsys.h
index c750603989f..3129e46ed06 100644
--- a/src/gallium/drivers/svga/svga_winsys.h
+++ b/src/gallium/drivers/svga/svga_winsys.h
@@ -85,6 +85,8 @@ struct winsys_handle;
 #define SVGA_QUERY_FLAG_SET        (1 << 0)
 #define SVGA_QUERY_FLAG_REF        (1 << 1)
 
+#define SVGA_HINT_FLAG_DRAW_EMITTED (1 << 0)
+
 /** Opaque surface handle */
 struct svga_winsys_surface;
 
@@ -213,6 +215,11 @@ struct svga_winsys_context
    uint32 cid;
 
    /**
+    * Flags to hint the current context state
+    */
+   uint32 hints;
+
+   /**
     ** BEGIN new functions for guest-backed surfaces.
     **/