framebuffer: split GL code out from cogl-framebuffer.c

This splits out most of the OpenGL specific code from cogl-framebuffer.c
into cogl-framebuffer-gl.c and extends the CoglDriverVtable interface
for cogl-framebuffer.c to use.

There are hopes to support several different backends for Cogl
eventually to hopefully get us closer to the metal so this makes some
progress in organizing which parts of Cogl are OpenGL specific so these
parts can potentially be switched out later.

The only remaining use of OpenGL still in cogl-framebuffer.c is to
handle cogl_framebuffer_read_pixels.

1 files changed, 57 insertions, 0 deletions

diff --git a/cogl/cogl-driver.h b/cogl/cogl-driver.h
index e22439a3..7b82628d 100644
--- a/cogl/cogl-driver.h
+++ b/cogl/cogl-driver.h
@@ -25,6 +25,8 @@
 #define __COGL_DRIVER_H
 
 #include "cogl-context.h"
+#include "cogl-offscreen.h"
+#include "cogl-framebuffer-private.h"
 
 typedef struct _CoglDriverVtable CoglDriverVtable;
 
@@ -45,6 +47,61 @@ struct _CoglDriverVtable
   CoglBool
   (* update_features) (CoglContext *context,
                        GError **error);
+
+  CoglBool
+  (* offscreen_allocate) (CoglOffscreen *offscreen,
+                          GError **error);
+
+  void
+  (* offscreen_free) (CoglOffscreen *offscreen);
+
+  void
+  (* framebuffer_flush_state) (CoglFramebuffer *draw_buffer,
+                               CoglFramebuffer *read_buffer,
+                               CoglFramebufferState state);
+
+  void
+  (* framebuffer_clear) (CoglFramebuffer *framebuffer,
+                         unsigned long buffers,
+                         float red,
+                         float green,
+                         float blue,
+                         float alpha);
+
+  void
+  (* framebuffer_query_bits) (CoglFramebuffer *framebuffer,
+                              int *red,
+                              int *green,
+                              int *blue,
+                              int *alpha);
+
+  void
+  (* framebuffer_finish) (CoglFramebuffer *framebuffer);
+
+  void
+  (* framebuffer_discard_buffers) (CoglFramebuffer *framebuffer,
+                                   unsigned long buffers);
+
+  void
+  (* framebuffer_draw_attributes) (CoglFramebuffer *framebuffer,
+                                   CoglPipeline *pipeline,
+                                   CoglVerticesMode mode,
+                                   int first_vertex,
+                                   int n_vertices,
+                                   CoglAttribute **attributes,
+                                   int n_attributes,
+                                   CoglDrawFlags flags);
+
+  void
+  (* framebuffer_draw_indexed_attributes) (CoglFramebuffer *framebuffer,
+                                           CoglPipeline *pipeline,
+                                           CoglVerticesMode mode,
+                                           int first_vertex,
+                                           int n_vertices,
+                                           CoglIndices *indices,
+                                           CoglAttribute **attributes,
+                                           int n_attributes,
+                                           CoglDrawFlags flags);
 };
 
 #endif /* __COGL_DRIVER_H */