mutter/cogl/cogl-renderer.h

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Adds renderer,display,onscreen-template and swap-chain stubs As part of the process of splitting Cogl out as a standalone graphics API we need to introduce some API concepts that will allow us to initialize a new CoglContext when Clutter isn't there to handle that for us... The new objects roughly in the order that they are (optionally) involved in constructing a context are: CoglRenderer, CoglOnscreenTemplate, CoglSwapChain and CoglDisplay. Conceptually a CoglRenderer represents a means for rendering. Cogl supports rendering via OpenGL or OpenGL ES 1/2.0 and those APIs are accessed through a number of different windowing APIs such as GLX, EGL, SDL or WGL and more. Potentially in the future Cogl could render using D3D or even by using libdrm and directly banging the hardware. All these choices are wrapped up in the configuration of a CoglRenderer. Conceptually a CoglDisplay represents a display pipeline for a renderer. Although Cogl doesn't aim to provide a detailed abstraction of display hardware, on some platforms we can give control over multiple display planes (On TV platforms for instance video content may be on one plane and 3D would be on another so a CoglDisplay lets you select the plane up-front.) Another aspect of CoglDisplay is that it lets us negotiate a display pipeline that best supports the type of CoglOnscreen framebuffers we are planning to create. For instance if you want transparent CoglOnscreen framebuffers then we have to be sure the display pipeline wont discard the alpha component of your framebuffers. Or if you want to use double/tripple buffering that requires support from the display pipeline. CoglOnscreenTemplate and CoglSwapChain are how we describe our default CoglOnscreen framebuffer configuration which can affect the configuration of the display pipeline. The default/simple way we expect most CoglContexts to be constructed will be via something like: if (!cogl_context_new (NULL, &error)) g_error ("Failed to construct a CoglContext: %s", error->message); Where that NULL is for an optional "display" parameter and NULL says to Cogl "please just try to do something sensible". If you want some more control though you can manually construct a CoglDisplay something like: display = cogl_display_new (NULL, NULL); cogl_gdl_display_set_plane (display, plane); if (!cogl_display_setup (display, &error)) g_error ("Failed to setup a CoglDisplay: %s", error->message); And in a similar fashion to cogl_context_new() you can optionally pass a NULL "renderer" and/or a NULL "onscreen template" so Cogl will try to just do something sensible. If you need to change the CoglOnscreen defaults you can provide a template something like: chain = cogl_swap_chain_new (); cogl_swap_chain_set_has_alpha (chain, TRUE); cogl_swap_chain_set_length (chain, 3); onscreen_template = cogl_onscreen_template_new (chain); cogl_onscreen_template_set_pixel_format (onscreen_template, COGL_PIXEL_FORMAT_RGB565); display = cogl_display_new (NULL, onscreen_template); if (!cogl_display_setup (display, &error)) g_error ("Failed to setup a CoglDisplay: %s", error->message);
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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_RENDERER_H__
#define __COGL_RENDERER_H__
#include <glib.h>
#include <cogl/cogl-types.h>
#include <cogl/cogl-onscreen-template.h>
#ifdef COGL_HAS_XLIB
#include <X11/Xlib.h>
#endif
G_BEGIN_DECLS
/**
* SECTION:cogl-renderer
* @short_description:
*
*/
#define cogl_renderer_error_quark cogl_renderer_error_quark_EXP
#define COGL_RENDERER_ERROR cogl_renderer_error_quark ()
GQuark
cogl_renderer_error_quark (void);
typedef struct _CoglRenderer CoglRenderer;
#define cogl_is_renderer cogl_is_renderer_EXP
gboolean
cogl_is_renderer (void *object);
#define cogl_renderer_new cogl_renderer_new_EXP
CoglRenderer *
cogl_renderer_new (void);
/* optional configuration APIs */
#ifdef COGL_HAS_XLIB
#define cogl_renderer_xlib_handle_event cogl_renderer_xlib_handle_event_EXP
/*
* cogl_renderer_xlib_handle_event:
* @xevent: pointer to XEvent structure
*
* This function processes a single X event; it can be used to hook
* into external X event retrieval (for example that done by Clutter
* or GDK).
*
* Return value: #CoglXlibFilterReturn. %COGL_XLIB_FILTER_REMOVE
* indicates that Cogl has internally handled the event and the
* caller should do no further processing. %COGL_XLIB_FILTER_CONTINUE
* indicates that Cogl is either not interested in the event,
* or has used the event to update internal state without taking
* any exclusive action.
*/
CoglXlibFilterReturn
cogl_renderer_xlib_handle_event (CoglRenderer *renderer,
XEvent *xevent);
#define cogl_renderer_xlib_get_foreign_display \
cogl_renderer_xlib_get_foreign_display_EXP
/*
* cogl_renderer_xlib_get_foreign_display:
*
* Return value: the foreign Xlib display that will be used by any Xlib based
* winsys backend. The display needs to be set with
* cogl_renderer_xlib_set_foreign_display() before this function is called.
*/
Display *
cogl_renderer_xlib_get_foreign_display (CoglRenderer *renderer);
#define cogl_renderer_xlib_set_foreign_display \
cogl_renderer_xlib_set_foreign_display_EXP
/*
* cogl_renderer_xlib_set_foreign_display:
*
* Sets a foreign Xlib display that Cogl will use for and Xlib based winsys
* backend.
*/
void
cogl_renderer_xlib_set_foreign_display (CoglRenderer *renderer,
Display *display);
#define cogl_renderer_xlib_get_display cogl_renderer_xlib_get_display_EXP
Display *
cogl_renderer_xlib_get_display (CoglRenderer *renderer);
#define cogl_renderer_xlib_add_filter cogl_renderer_xlib_add_filter_EXP
/*
* _cogl_xlib_add_filter:
*
* Adds a callback function that will receive all X11 events. The
* function can stop further processing of the event by return
* %COGL_XLIB_FILTER_REMOVE.
*/
void
cogl_renderer_xlib_add_filter (CoglRenderer *renderer,
CoglXlibFilterFunc func,
void *data);
#define cogl_renderer_xlib_remove_filter cogl_renderer_xlib_remove_filter_EXP
/*
* _cogl_xlib_remove_filter:
*
* Removes a callback that was previously added with
* _cogl_xlib_add_filter().
*/
void
cogl_renderer_xlib_remove_filter (CoglRenderer *renderer,
CoglXlibFilterFunc func,
void *data);
#endif /* COGL_HAS_XLIB */
#define cogl_renderer_check_onscreen_template \
cogl_renderer_check_onscreen_template_EXP
gboolean
cogl_renderer_check_onscreen_template (CoglRenderer *renderer,
CoglOnscreenTemplate *onscreen_template,
GError **error);
/* Final connection API */
#define cogl_renderer_connect cogl_renderer_connect_EXP
gboolean
cogl_renderer_connect (CoglRenderer *renderer, GError **error);
G_END_DECLS
#endif /* __COGL_RENDERER_H__ */