dix: pixmap sharing infrastructure (v3)

This is a hooks for pixmap sharing and tracking.

The pixmap sharing ones get an integer handle for the pixmap
and use a handle to be the backing for a pixmap.

The tracker interface is to be used when a GPU needs to
track pixmaps to be updated for another GPU.

v2: pass slave to sharing so it can use it to work out driver.

v3: use void * as per keithp's suggestion.

Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/scrnintstr.h b/include/scrnintstr.h
index 7efc5c3c1..3a738d3b0 100644
--- a/include/scrnintstr.h
+++ b/include/scrnintstr.h
@@ -179,6 +179,8 @@ typedef void (*ClipNotifyProcPtr) (WindowPtr /*pWindow */ ,
 #define CREATE_PIXMAP_USAGE_BACKING_PIXMAP              2
 /* pixmap will contain a glyph */
 #define CREATE_PIXMAP_USAGE_GLYPH_PICTURE               3
+/* pixmap will be shared */
+#define CREATE_PIXMAP_USAGE_SHARED                      4
 
 typedef PixmapPtr (*CreatePixmapProcPtr) (ScreenPtr /*pScreen */ ,
                                           int /*width */ ,
@@ -339,6 +341,16 @@ typedef void (*DeviceCursorCleanupProcPtr) (DeviceIntPtr /* pDev */ ,
 typedef void (*ConstrainCursorHarderProcPtr) (DeviceIntPtr, ScreenPtr, int,
                                               int *, int *);
 
+
+typedef Bool (*SharePixmapBackingProcPtr)(PixmapPtr, ScreenPtr, void **);
+
+typedef Bool (*SetSharedPixmapBackingProcPtr)(PixmapPtr, void *);
+
+typedef Bool (*StartPixmapTrackingProcPtr)(PixmapPtr, PixmapPtr,
+                                           int x, int y);
+
+typedef Bool (*StopPixmapTrackingProcPtr)(PixmapPtr, PixmapPtr);
+
 typedef struct _Screen {
     int myNum;                  /* index of this instance in Screens[] */
     ATOM id;
@@ -488,6 +500,11 @@ typedef struct _Screen {
     struct xorg_list output_slave_list;
     struct xorg_list output_head;
 
+    SharePixmapBackingProcPtr SharePixmapBacking;
+    SetSharedPixmapBackingProcPtr SetSharedPixmapBacking;
+
+    StartPixmapTrackingProcPtr StartPixmapTracking;
+    StopPixmapTrackingProcPtr StopPixmapTracking;
 } ScreenRec;
 
 static inline RegionPtr