bcd97f35ea
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);
159 lines
4.7 KiB
C
159 lines
4.7 KiB
C
/*
|
|
* 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__ */
|
|
|