evas: add gl_generic backend.

This is the first step to introduce a common gl infrastructure for all gl based backend.
For now it is strictly doing the exact same thing that the gl_x11 was doing, but I already
spoted that a lot of the optimization in gl_x11 where not incorporated in other gl backend.
So this is going to help everyone by sharing more code on a crucial part of our infrastructure.

src/modules/evas/engines/gl_generic/Evas_Engine_GL_Generic.h

@@ -0,0 +1,106 @@
+#ifndef EVAS_ENGINE_GL_GENERIC_H__
+# define EVAS_ENGINE_GL_GENERIC_H__
+
+#include "../software_generic/Evas_Engine_Software_Generic.h"
+#include "../gl_common/evas_gl_common.h"
+#include "../gl_common/evas_gl_core.h"
+#include "../gl_common/evas_gl_core_private.h"
+
+typedef struct _Render_Engine_GL_Generic Render_Engine_GL_Generic;
+typedef struct _Context_3D Context_3D;
+
+typedef void (*Window_Use)(Outbuf *ob);
+typedef Evas_Engine_GL_Context *(*Window_GL_Context_Get)(Outbuf *ob);
+typedef void *(*Window_EGL_Display_Get)(Outbuf *ob);
+typedef Context_3D *(*Window_GL_Context_New)(Outbuf *ob);
+typedef void (*Window_GL_Context_Use)(Context_3D *ctx);
+typedef int (*EVGL_Init)(Render_Engine_GL_Generic *re);
+
+struct _Render_Engine_GL_Generic
+{
+   Render_Engine_Software_Generic software;
+
+   Window_Use window_use;
+   Window_GL_Context_Get window_gl_context_get;
+   Window_EGL_Display_Get window_egl_display_get;
+   Window_GL_Context_New window_gl_context_new;
+   Window_GL_Context_Use window_gl_context_use;
+
+   struct {
+      Evas_Object_Image_Pixels_Get_Cb  get_pixels;
+      void                            *get_pixels_data;
+      Evas_Object                     *obj;
+   } func;
+
+   Context_3D           *context_3d;
+   E3D_Renderer         *renderer_3d;
+   const EVGL_Interface *evgl_funcs;
+
+   Eina_Bool evgl_initted : 1;
+};
+
+static inline Eina_Bool
+evas_render_engine_gl_generic_init(Render_Engine_GL_Generic *re,
+                                   Outbuf *ob,
+                                   Outbuf_Swap_Mode_Get outbuf_swap_mode_get,
+                                   Outbuf_Get_Rot outbuf_get_rot,
+                                   Outbuf_Reconfigure outbuf_reconfigure,
+                                   Outbuf_Region_First_Rect outbuf_region_first_rect,
+                                   Outbuf_New_Region_For_Update outbuf_new_region_for_update,
+                                   Outbuf_Push_Updated_Region outbuf_push_updated_region,
+                                   Outbuf_Free_Region_For_Update outbuf_free_region_for_update,
+                                   Outbuf_Idle_Flush outbuf_idle_flush,
+                                   Outbuf_Flush outbuf_flush,
+                                   Outbuf_Free outbuf_free,
+                                   Window_Use window_use,
+                                   Window_GL_Context_Get window_gl_context_get,
+                                   Window_EGL_Display_Get window_egl_display_get,
+                                   Window_GL_Context_New window_gl_context_new,
+                                   Window_GL_Context_Use window_gl_context_use,
+                                   const EVGL_Interface *evgl_funcs,
+                                   int w, int h)
+{
+   if (!evas_render_engine_software_generic_init(&re->software, ob,
+                                                 outbuf_swap_mode_get,
+                                                 outbuf_get_rot,
+                                                 outbuf_reconfigure,
+                                                 outbuf_region_first_rect,
+                                                 outbuf_new_region_for_update,
+                                                 outbuf_push_updated_region,
+                                                 outbuf_free_region_for_update,
+                                                 outbuf_idle_flush,
+                                                 outbuf_flush,
+                                                 outbuf_free,
+                                                 w, h))
+     return EINA_FALSE;
+
+   re->window_use = window_use;
+   re->window_gl_context_get = window_gl_context_get;
+   re->window_egl_display_get = window_egl_display_get;
+   re->window_gl_context_new = window_gl_context_new;
+   re->window_gl_context_use = window_gl_context_use;
+
+   re->func.get_pixels = NULL;
+   re->func.get_pixels_data = NULL;
+   re->func.obj = NULL;
+   re->context_3d = NULL;
+   re->renderer_3d = NULL;
+   re->evgl_funcs = evgl_funcs;
+
+   re->evgl_initted = EINA_FALSE;
+
+   return EINA_TRUE;
+}
+
+static inline void
+evas_render_engine_software_gl_get_pixels_set(Render_Engine_GL_Generic *re,
+                                              Evas_Object_Image_Pixels_Get_Cb get_pixels,
+                                              void *get_pixels_data,
+                                              Evas_Object *obj)
+{
+   re->func.get_pixels = get_pixels;
+   re->func.get_pixels_data = get_pixels_data;
+   re->func.obj = obj;
+}
+
+#endif