Index: gfxdrivers/matrox/matrox_crtc2.c
===================================================================
RCS file: /cvs/directfb/DirectFB/gfxdrivers/matrox/matrox_crtc2.c,v
retrieving revision 1.1
diff -p -u -p -u -r1.1 matrox_crtc2.c
--- gfxdrivers/matrox/matrox_crtc2.c	5 Sep 2002 11:36:23 -0000	1.1
+++ gfxdrivers/matrox/matrox_crtc2.c	26 Sep 2002 00:33:19 -0000
@@ -364,6 +364,23 @@ crtc2SetOpacity( DisplayLayer *layer,
      return DFB_OK;
 }
 
+static DFBResult
+crtc2GetCurrentOutputField( DisplayLayer *layer,
+                            void         *driver_data,
+                            void         *layer_data,
+                            int          *field )
+{
+     MatroxDriverData     *mdrv   = (MatroxDriverData*) driver_data;
+     int mga_field = ( mga_in32( mdrv->mmio_base, C2VCOUNT ) >> 24 ) & 1;
+
+     if( field ) {
+          *field = mga_field;
+          return DFB_OK;
+     } else {
+          return DFB_INVARG;
+     }
+}
+
 DisplayLayerFuncs matroxCrtc2Funcs = {
      LayerDataSize:      crtc2LayerDataSize,
      InitLayer:          crtc2InitLayer,
@@ -373,7 +390,8 @@ DisplayLayerFuncs matroxCrtc2Funcs = {
      SetConfiguration:   crtc2SetConfiguration,
      FlipBuffers:        crtc2FlipBuffers,
      SetColorAdjustment: crtc2SetColorAdjustment,
-     SetOpacity:         crtc2SetOpacity
+     SetOpacity:         crtc2SetOpacity,
+     GetCurrentOutputField: crtc2GetCurrentOutputField
 };
 
 /* internal */
Index: include/directfb.h
===================================================================
RCS file: /cvs/directfb/DirectFB/include/directfb.h,v
retrieving revision 1.149
diff -p -u -p -u -r1.149 directfb.h
--- include/directfb.h	10 Sep 2002 21:42:04 -0000	1.149
+++ include/directfb.h	26 Sep 2002 00:33:20 -0000
@@ -1470,6 +1470,23 @@ DEFINE_INTERFACE(   IDirectFBDisplayLaye
           int                                 level
      );
 
+     /*
+      * For an interlaced display, this Returns the currently inactive
+      * field: 0 for an even field (the even scanlines starting at 0),
+      * and 1 for an odd field (the odd scanlines starting at 1).
+      *
+      * The inactive field is the one you should draw to next to avoid
+      * tearing, the active field is the one currently being displayed.
+      *
+      * For a progressive output, this should always return 0.  We should
+      * also have some other call to indicate whether the display layer
+      * is interlaced or progressive, but this is a start.
+      */
+     DFBResult (*GetCurrentOutputField) (
+          IDirectFBDisplayLayer              *thiz,
+          int                                *field
+     );
+
 
    /** Configuration handling **/
 
Index: src/core/layers.c
===================================================================
RCS file: /cvs/directfb/DirectFB/src/core/layers.c,v
retrieving revision 1.67
diff -p -u -p -u -r1.67 layers.c
--- src/core/layers.c	11 Sep 2002 10:47:07 -0000	1.67
+++ src/core/layers.c	26 Sep 2002 00:33:20 -0000
@@ -1084,6 +1084,22 @@ dfb_layer_set_opacity (DisplayLayer *lay
      return DFB_OK;
 }
 
+DFBResult dfb_layer_get_current_output_field( DisplayLayer *layer, int *field )
+{
+     DFBResult           ret;
+     DisplayLayerShared *shared = layer->shared;
+
+     if (!layer->funcs->GetCurrentOutputField)
+          return DFB_UNSUPPORTED;
+     
+     ret = layer->funcs->GetCurrentOutputField( layer, layer->driver_data,
+                                                layer->layer_data, field );
+     if (ret)
+          return ret;
+
+     return DFB_OK;
+}
+
 DFBResult
 dfb_layer_set_coloradjustment (DisplayLayer       *layer,
                                DFBColorAdjustment *adj)
Index: src/core/layers.h
===================================================================
RCS file: /cvs/directfb/DirectFB/src/core/layers.h,v
retrieving revision 1.38
diff -p -u -p -u -r1.38 layers.h
--- src/core/layers.h	11 Sep 2002 10:47:07 -0000	1.38
+++ src/core/layers.h	26 Sep 2002 00:33:20 -0000
@@ -83,6 +83,11 @@ typedef struct {
                                       void                       *driver_data,
                                       void                       *layer_data,
                                       __u8                        opacity );
+
+     DFBResult (*GetCurrentOutputField) ( DisplayLayer           *layer,
+                                          void                   *driver_data,
+                                          void                   *layer_data,
+                                          int                    *field );
      
      DFBResult (*SetScreenLocation) ( DisplayLayer               *layer,
                                       void                       *driver_data,
@@ -308,6 +313,8 @@ DFBResult dfb_layer_set_screenlocation( 
                                         float width, float height );
 
 DFBResult dfb_layer_set_opacity (DisplayLayer *layer, __u8 opacity);
+
+DFBResult dfb_layer_get_current_output_field( DisplayLayer *layer, int *field );
 
 DFBResult dfb_layer_set_coloradjustment (DisplayLayer       *layer,
                                          DFBColorAdjustment *adj);
Index: src/display/idirectfbdisplaylayer.c
===================================================================
RCS file: /cvs/directfb/DirectFB/src/display/idirectfbdisplaylayer.c,v
retrieving revision 1.40
diff -p -u -p -u -r1.40 idirectfbdisplaylayer.c
--- src/display/idirectfbdisplaylayer.c	10 Sep 2002 16:35:54 -0000	1.40
+++ src/display/idirectfbdisplaylayer.c	26 Sep 2002 00:33:20 -0000
@@ -218,6 +218,14 @@ IDirectFBDisplayLayer_SetOpacity( IDirec
 }
 
 static DFBResult
+IDirectFBDisplayLayer_GetCurrentOutputField( IDirectFBDisplayLayer *thiz, int *field )
+{
+     INTERFACE_GET_DATA(IDirectFBDisplayLayer)
+
+     return dfb_layer_get_current_output_field( data->layer, field );
+}
+
+static DFBResult
 IDirectFBDisplayLayer_SetScreenLocation( IDirectFBDisplayLayer *thiz,
                                          float                  x,
                                          float                  y,
@@ -591,6 +599,7 @@ IDirectFBDisplayLayer_Construct( IDirect
      thiz->GetSurface = IDirectFBDisplayLayer_GetSurface;
      thiz->SetCooperativeLevel = IDirectFBDisplayLayer_SetCooperativeLevel;
      thiz->SetOpacity = IDirectFBDisplayLayer_SetOpacity;
+     thiz->GetCurrentOutputField = IDirectFBDisplayLayer_GetCurrentOutputField;
      thiz->SetScreenLocation = IDirectFBDisplayLayer_SetScreenLocation;
      thiz->SetSrcColorKey = IDirectFBDisplayLayer_SetSrcColorKey;
      thiz->SetDstColorKey = IDirectFBDisplayLayer_SetDstColorKey;