text: /* GDK - The GIMP Drawing Kit
   *
   * gdkglcontextprivate.h: GL context abstraction
   * 
   * Copyright © 2014  Emmanuele Bassi
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public
   * License along with this library. If not, see <http://www.gnu.org/licenses/>.
   */
  
  #ifndef __GDK_GL_CONTEXT_PRIVATE_H__
  #define __GDK_GL_CONTEXT_PRIVATE_H__
  
  #include "gdkglcontext.h"
  
  G_BEGIN_DECLS
  
  #define GDK_GL_CONTEXT_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_GL_CONTEXT, GdkGLContextClass))
  #define GDK_IS_GL_CONTEXT_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_GL_CONTEXT))
  #define GDK_GL_CONTEXT_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_GL_CONTEXT, GdkGLContextClass))
  
  typedef struct _GdkGLContextClass       GdkGLContextClass;
  
  struct _GdkGLContext
  {
    GObject parent_instance;
  };
  
  struct _GdkGLContextClass
  {
    GObjectClass parent_class;
  
    gboolean (* realize) (GdkGLContext *context,
                          GError **error);
  
    void (* end_frame)    (GdkGLContext *context,
                           cairo_region_t *painted,
                           cairo_region_t *damage);
    gboolean (* texture_from_surface) (GdkGLContext    *context,
                                       cairo_surface_t *surface,
                                       cairo_region_t  *region);
  };
  
  typedef struct {
    guint program;
    guint position_location;
    guint uv_location;
    guint map_location;
  } GdkGLContextProgram;
  
  typedef struct {
    guint vertex_array_object;
    guint tmp_framebuffer;
    guint tmp_vertex_buffer;
  
    GdkGLContextProgram texture_2d_quad_program;
    GdkGLContextProgram texture_rect_quad_program;
  
    GdkGLContextProgram *current_program;
  } GdkGLContextPaintData;
  
  void                    gdk_gl_context_upload_texture           (GdkGLContext    *context,
                                                                   cairo_surface_t *image_surface,
                                                                   int              width,
                                                                   int              height,
                                                                   guint            texture_target);
  GdkGLContextPaintData * gdk_gl_context_get_paint_data           (GdkGLContext    *context);
  gboolean                gdk_gl_context_use_texture_rectangle    (GdkGLContext    *context);
  gboolean                gdk_gl_context_has_framebuffer_blit     (GdkGLContext    *context);
  gboolean                gdk_gl_context_has_frame_terminator     (GdkGLContext    *context);
  void                    gdk_gl_context_end_frame                (GdkGLContext    *context,
                                                                   cairo_region_t  *painted,
                                                                   cairo_region_t  *damage);
  
  G_END_DECLS
  
  #endif /* __GDK_GL_CONTEXT_PRIVATE_H__ */
  