1 files changed, 15 insertions, 0 deletions
diff --git a/cogl/winsys/cogl-winsys-private.h b/cogl/winsys/cogl-winsys-private.h
index 16317b7b..4fb1cbab 100644
--- a/cogl/winsys/cogl-winsys-private.h
+++ b/cogl/winsys/cogl-winsys-private.h
@@ -54,6 +54,18 @@ typedef enum
   COGL_WINSYS_RECTANGLE_STATE_ENABLE
 } CoglWinsysRectangleState;
 
+/* Flags to specify which types of buffers need to be rendered to
+   upside-down for this particularly renderer. Currently all offscreen
+   buffers need to be rendered upside down in Cogl because the texture
+   coordinate 0,0 is expected to be the topleft whereas in GL it is
+   the bottom-left. Additionally, some backends may require rendering
+   upside-down to onscreen buffers as well */
+typedef enum
+{
+  COGL_RENDERER_FLIP_ONSCREEN = (1 << 0),
+  COGL_RENDERER_FLIP_OFFSCREEN = (1 << 1),
+} CoglRendererFramebufferOrientation;
+
 typedef struct _CoglWinsysVtable
 {
   CoglWinsysID id;
@@ -110,6 +122,9 @@ typedef struct _CoglWinsysVtable
                            const int *rectangles,
                            int n_rectangles);
 
+  CoglRendererFramebufferOrientation
+  (*renderer_get_framebuffer_orientation) (CoglRenderer *renderer);
+
 #ifdef COGL_HAS_EGL_SUPPORT
   EGLDisplay
   (*context_egl_get_egl_display) (CoglContext *context);