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Diffstat (limited to 'cogl/cogl/cogl-display.h')
-rw-r--r-- | cogl/cogl/cogl-display.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/cogl/cogl/cogl-display.h b/cogl/cogl/cogl-display.h new file mode 100644 index 000000000..47720a3fb --- /dev/null +++ b/cogl/cogl/cogl-display.h @@ -0,0 +1,214 @@ +/* + * Cogl + * + * A Low Level GPU Graphics and Utilities API + * + * Copyright (C) 2010 Intel Corporation. + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, + * modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Authors: + * Robert Bragg <robert@linux.intel.com> + * + */ + +#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION) +#error "Only <cogl/cogl.h> can be included directly." +#endif + +#ifndef __COGL_DISPLAY_H__ +#define __COGL_DISPLAY_H__ + +#include <cogl/cogl-renderer.h> +#include <cogl/cogl-onscreen-template.h> + +#ifdef COGL_HAS_GTYPE_SUPPORT +#include <glib-object.h> +#endif + +COGL_BEGIN_DECLS + +/** + * SECTION:cogl-display + * @short_description: Common aspects of a display pipeline + * + * The basic intention for this object is to let the application + * configure common display preferences before creating a context, and + * there are a few different aspects to this... + * + * Firstly there are options directly relating to the physical display + * pipeline that is currently being used including the digital to + * analogue conversion hardware and the screens the user sees. + * + * Another aspect is that display options may constrain or affect how + * onscreen framebuffers should later be configured. The original + * rationale for the display object in fact was to let us handle GLX + * and EGLs requirements that framebuffers must be "compatible" with + * the config associated with the current context meaning we have to + * force the user to describe how they would like to create their + * onscreen windows before we can choose a suitable fbconfig and + * create a GLContext. + */ + +typedef struct _CoglDisplay CoglDisplay; + +#define COGL_DISPLAY(OBJECT) ((CoglDisplay *)OBJECT) + +#ifdef COGL_HAS_GTYPE_SUPPORT +/** + * cogl_display_get_gtype: + * + * Returns: a #GType that can be used with the GLib type system. + */ +GType cogl_display_get_gtype (void); +#endif + +/** + * cogl_display_new: + * @renderer: A #CoglRenderer + * @onscreen_template: A #CoglOnscreenTemplate + * + * Explicitly allocates a new #CoglDisplay object to encapsulate the + * common state of the display pipeline that applies to the whole + * application. + * + * <note>Many applications don't need to explicitly use + * cogl_display_new() and can just jump straight to cogl_context_new() + * and pass a %NULL display argument so Cogl will automatically + * connect and setup a renderer and display.</note> + * + * A @display can only be made for a specific choice of renderer which + * is why this takes the @renderer argument. + * + * A common use for explicitly allocating a display object is to + * define a template for allocating onscreen framebuffers which is + * what the @onscreen_template argument is for, or alternatively + * you can use cogl_display_set_onscreen_template(). + * + * When a display is first allocated via cogl_display_new() it is in a + * mutable configuration mode. It's designed this way so we can + * extend the apis available for configuring a display without + * requiring huge numbers of constructor arguments. + * + * When you have finished configuring a display object you can + * optionally call cogl_display_setup() to explicitly apply the + * configuration and check for errors. Alternaitvely you can pass the + * display to cogl_context_new() and Cogl will implicitly apply your + * configuration but if there are errors then the application will + * abort with a message. For simple applications with no fallback + * options then relying on the implicit setup can be fine. + * + * Return value: (transfer full): A newly allocated #CoglDisplay + * object in a mutable configuration mode. + * Since: 1.10 + * Stability: unstable + */ +CoglDisplay * +cogl_display_new (CoglRenderer *renderer, + CoglOnscreenTemplate *onscreen_template); + +/** + * cogl_display_get_renderer: + * @display: a #CoglDisplay + * + * Queries the #CoglRenderer associated with the given @display. + * + * Return value: (transfer none): The associated #CoglRenderer + * + * Since: 1.10 + * Stability: unstable + */ +CoglRenderer * +cogl_display_get_renderer (CoglDisplay *display); + +/** + * cogl_display_set_onscreen_template: + * @display: a #CoglDisplay + * @onscreen_template: A template for creating #CoglOnscreen framebuffers + * + * Specifies a template for creating #CoglOnscreen framebuffers. + * + * Depending on the system, the constraints for creating #CoglOnscreen + * framebuffers need to be known before setting up a #CoglDisplay because the + * final setup of the display may constrain how onscreen framebuffers may be + * allocated. If Cogl knows how an application wants to allocate onscreen + * framebuffers then it can try to make sure to setup the display accordingly. + * + * Since: 1.16 + * Stability: unstable + */ +void +cogl_display_set_onscreen_template (CoglDisplay *display, + CoglOnscreenTemplate *onscreen_template); + +/** + * cogl_display_setup: + * @display: a #CoglDisplay + * @error: return location for a #CoglError + * + * Explicitly sets up the given @display object. Use of this api is + * optional since Cogl will internally setup the display if not done + * explicitly. + * + * When a display is first allocated via cogl_display_new() it is in a + * mutable configuration mode. This allows us to extend the apis + * available for configuring a display without requiring huge numbers + * of constructor arguments. + * + * Its possible to request a configuration that might not be + * supportable on the current system and so this api provides a means + * to apply the configuration explicitly but if it fails then an + * exception will be returned so you can handle the error gracefully + * and perhaps fall back to an alternative configuration. + * + * If you instead rely on Cogl implicitly calling cogl_display_setup() + * for you then if there is an error with the configuration you won't + * get an opportunity to handle that and the application may abort + * with a message. For simple applications that don't have any + * fallback options this behaviour may be fine. + * + * Return value: Returns %TRUE if there was no error, else it returns + * %FALSE and returns an exception via @error. + * Since: 1.10 + * Stability: unstable + */ +CoglBool +cogl_display_setup (CoglDisplay *display, + CoglError **error); + +/** + * cogl_is_display: + * @object: A #CoglObject pointer + * + * Gets whether the given object references a #CoglDisplay. + * + * Return value: %TRUE if the object references a #CoglDisplay + * and %FALSE otherwise. + * Since: 1.10 + * Stability: unstable + */ +CoglBool +cogl_is_display (void *object); + +COGL_END_DECLS + +#endif /* __COGL_DISPLAY_H__ */ + |