framebuffer: expose viewport getters/setters

This exposes experimental cogl_framebuffer APIs for getting and setting
a viewport without having to refer to the implicit CoglContext. It adds
the following experimental API:

  cogl_framebuffer_set_viewport
  cogl_framebuffer_get_viewport4fv
  cogl_framebuffer_get_viewport_x
  cogl_framebuffer_get_viewport_y
  cogl_framebuffer_get_viewport_width
  cogl_framebuffer_get_viewport_height

Signed-off-by: Neil Roberts <neil@linux.intel.com>

cogl/cogl-framebuffer-private.h

@@ -194,28 +194,6 @@ void
 _cogl_framebuffer_set_clip_stack (CoglFramebuffer *framebuffer,
                                   CoglClipStack *stack);
 
-void
-_cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
-                                float x,
-                                float y,
-                                float width,
-                                float height);
-float
-_cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer);
-
-float
-_cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer);
-
-float
-_cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer);
-
-float
-_cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer);
-
-void
-_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
-                                   float *viewport);
-
 CoglMatrixStack *
 _cogl_framebuffer_get_modelview_stack (CoglFramebuffer *framebuffer);
 

cogl/cogl-framebuffer.c

@@ -507,7 +507,7 @@ _cogl_framebuffer_set_clip_stack (CoglFramebuffer *framebuffer,
 }
 
 void
-_cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
+cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
                                float x,
                                float y,
                                float width,
@@ -533,31 +533,31 @@ _cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
 }
 
 float
-_cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer)
+cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer)
 {
   return framebuffer->viewport_x;
 }
 
 float
-_cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer)
+cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer)
 {
   return framebuffer->viewport_y;
 }
 
 float
-_cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer)
+cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer)
 {
   return framebuffer->viewport_width;
 }
 
 float
-_cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer)
+cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer)
 {
   return framebuffer->viewport_height;
 }
 
 void
-_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
+cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
                                   float *viewport)
 {
   viewport[0] = framebuffer->viewport_x;

cogl/cogl-framebuffer.h

@@ -58,6 +58,35 @@ cogl_framebuffer_get_width (CoglFramebuffer *framebuffer);
 int
 cogl_framebuffer_get_height (CoglFramebuffer *framebuffer);
 
+#define cogl_framebuffer_set_viewport cogl_framebuffer_set_viewport_EXP
+void
+cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
+                               float x,
+                               float y,
+                               float width,
+                               float height);
+
+#define cogl_framebuffer_get_viewport_x cogl_framebuffer_get_viewport_x_EXP
+float
+cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer);
+
+#define cogl_framebuffer_get_viewport_y cogl_framebuffer_get_viewport_y_EXP
+float
+cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer);
+
+#define cogl_framebuffer_get_viewport_width cogl_framebuffer_get_viewport_width_EXP
+float
+cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer);
+
+#define cogl_framebuffer_get_viewport_height cogl_framebuffer_get_viewport_height_EXP
+float
+cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer);
+
+#define cogl_framebuffer_get_viewport4fv cogl_framebuffer_get_viewport4fv_EXP
+void
+cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
+                                  float *viewport);
+
 #define cogl_framebuffer_swap_buffers cogl_framebuffer_swap_buffers_EXP
 void
 cogl_framebuffer_swap_buffers (CoglFramebuffer *framebuffer);

cogl/cogl-journal.c

@@ -1647,8 +1647,7 @@ entry_to_screen_polygon (const CoglJournalEntry *entry,
                               poly, /* points_out */
                               4 /* n_points */);
 
-  _cogl_framebuffer_get_viewport4fv (cogl_get_draw_framebuffer (),
-                                     viewport);
+  cogl_framebuffer_get_viewport4fv (cogl_get_draw_framebuffer (), viewport);
 
 /* Scale from OpenGL normalized device coordinates (ranging from -1 to 1)
  * to Cogl window/framebuffer coordinates (ranging from 0 to buffer-size) with

cogl/cogl-texture.c

@@ -1066,7 +1066,7 @@ _cogl_texture_draw_and_read (CoglHandle   handle,
 
   framebuffer = cogl_get_draw_framebuffer ();
   /* Viewport needs to have some size and be inside the window for this */
-  _cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
+  cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
   if (viewport[0] <  0 || viewport[1] <  0 ||
       viewport[2] <= 0 || viewport[3] <= 0)
     return FALSE;

cogl/cogl.c

@@ -349,7 +349,7 @@ cogl_set_viewport (int x,
 
   framebuffer = cogl_get_draw_framebuffer ();
 
-  _cogl_framebuffer_set_viewport (framebuffer,
+  cogl_framebuffer_set_viewport (framebuffer,
                                  x,
                                  y,
                                  width,
@@ -393,7 +393,7 @@ cogl_get_viewport (float viewport[4])
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
   framebuffer = cogl_get_draw_framebuffer ();
-  _cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
+  cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
 }
 
 void