kms: add some useful fetch methods

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index cc141a0..3e8ccec 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -115,6 +115,21 @@ drmmode_from_scrn(ScrnInfoPtr scrn)
 	return NULL;
 }
 
+int
+drmmode_head(xf86CrtcPtr crtc)
+{
+	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+	return drmmode_crtc->mode_crtc->crtc_id;
+}
+
+void
+drmmode_swap(ScrnInfoPtr scrn, uint32_t next, uint32_t *prev)
+{
+	drmmode_ptr drmmode = drmmode_from_scrn(scrn);
+	*prev = drmmode->fb_id;
+	drmmode->fb_id = next;
+}
+
 static PixmapPtr
 drmmode_pixmap_wrap(ScreenPtr pScreen, int width, int height, int depth,
 		    int bpp, int pitch, struct nouveau_bo *bo, void *data)
diff --git a/src/nv_proto.h b/src/nv_proto.h
index a573269..f45c0d6 100644
--- a/src/nv_proto.h
+++ b/src/nv_proto.h
@@ -12,6 +12,9 @@ Bool drmmode_page_flip(DrawablePtr draw, PixmapPtr back, void *priv,
 void drmmode_screen_init(ScreenPtr pScreen);
 void drmmode_screen_fini(ScreenPtr pScreen);
 
+int  drmmode_head(xf86CrtcPtr crtc);
+void drmmode_swap(ScrnInfoPtr, uint32_t, uint32_t *);
+
 /* in nv_accel_common.c */
 Bool NVAccelCommonInit(ScrnInfoPtr pScrn);
 Bool NVAccelGetCtxSurf2DFormatFromPixmap(PixmapPtr pPix, int *fmt_ret);