mirror of
https://github.com/brl/mutter.git
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87bc616d34
This commit introduces some new framebuffer api to be able to
enable texture based depth buffers for a framebuffer (currently
only supported for offscreen framebuffers) and once allocated
to be able to retrieve the depth buffer as a texture for further
usage, say, to implement shadow mapping.
The API works as follow:
* Before the framebuffer is allocated, you can request that a depth
texture is created with
cogl_framebuffer_set_depth_texture_enabled()
* cogl_framebuffer_get_depth_texture() can then be used to grab a
CoglTexture once the framebuffer has been allocated.
325 lines
11 KiB
C
325 lines
11 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_CONTEXT_H__
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#define __COGL_CONTEXT_H__
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/* We forward declare the CoglContext type here to avoid some circular
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* dependency issues with the following headers.
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*/
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typedef struct _CoglContext CoglContext;
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#include <cogl/cogl-defines.h>
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#include <cogl/cogl-display.h>
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#include <cogl/cogl-primitive.h>
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#ifdef COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT
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#include <android/native_window.h>
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#endif
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-context
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* @short_description: The top level application context.
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*
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* A #CoglContext is the top most sandbox of Cogl state for an
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* application or toolkit. Its main purpose is to act as a sandbox
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* for the memory management of state objects. Normally an application
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* will only create a single context since there is no way to share
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* resources between contexts.
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*
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* For those familiar with OpenGL or perhaps Cairo it should be
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* understood that unlike these APIs a Cogl context isn't a rendering
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* context as such. In other words Cogl doesn't aim to provide a state
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* machine style model for configuring rendering parameters. Most
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* rendering state in Cogl is directly associated with user managed
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* objects called pipelines and geometry is drawn with a specific
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* pipeline object to a framebuffer object and those 3 things fully
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* define the state for drawing. This is an important part of Cogl's
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* design since it helps you write orthogonal rendering components
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* that can all access the same GPU without having to worry about
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* what state other components have left you with.
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*
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* <note><para>Cogl does not maintain internal references to the context for
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* resources that depend on the context so applications. This is to
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* help applications control the lifetime a context without us needing to
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* introduce special api to handle the breakup of internal circular
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* references due to internal resources and caches associated with the
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* context.
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*
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* One a context has been destroyed then all directly or indirectly
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* dependant resources will be in an inconsistent state and should not
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* be manipulated or queried in any way.
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*
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* For applications that rely on the operating system to clean up
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* resources this policy shouldn't affect them, but for applications
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* that need to carefully destroy and re-create Cogl contexts multiple
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* times throughout their lifetime (such as Android applications) they
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* should be careful to destroy all context dependant resources, such as
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* framebuffers or textures etc before unrefing and destroying the
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* context.</para></note>
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*/
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#ifdef COGL_ENABLE_EXPERIMENTAL_API
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#define COGL_CONTEXT(OBJECT) ((CoglContext *)OBJECT)
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/**
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* cogl_context_new:
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* @display: A #CoglDisplay pointer
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* @error: A GError return location.
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*
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* Creates a new #CoglContext which acts as an application sandbox
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* for any state objects that are allocated.
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*
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* Return value: (transfer full): A newly allocated #CoglContext
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* Since: 1.8
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* Stability: unstable
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*/
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CoglContext *
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cogl_context_new (CoglDisplay *display,
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GError **error);
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/**
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* cogl_context_get_display:
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* @context: A #CoglContext pointer
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*
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* Retrieves the #CoglDisplay that is internally associated with the
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* given @context. This will return the same #CoglDisplay that was
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* passed to cogl_context_new() or if %NULL was passed to
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* cogl_context_new() then this function returns a pointer to the
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* display that was automatically setup internally.
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*
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* Return value: (transfer none): The #CoglDisplay associated with the
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* given @context.
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* Since: 1.8
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* Stability: unstable
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*/
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CoglDisplay *
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cogl_context_get_display (CoglContext *context);
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#ifdef COGL_HAS_EGL_PLATFORM_ANDROID_SUPPORT
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/**
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* cogl_android_set_native_window:
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* @window: A native Android window
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*
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* Allows Android applications to inform Cogl of the native window
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* that they have been given which Cogl can render too. On Android
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* this API must be used before creating a #CoglRenderer, #CoglDisplay
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* and #CoglContext.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_android_set_native_window (ANativeWindow *window);
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#endif
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/**
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* cogl_is_context:
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* @object: An object or %NULL
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*
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* Gets whether the given object references an existing context object.
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*
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* Return value: %TRUE if the @object references a #CoglContext,
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* %FALSE otherwise
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*
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* Since: 1.10
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* Stability: Unstable
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*/
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CoglBool
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cogl_is_context (void *object);
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#endif /* COGL_ENABLE_EXPERIMENTAL_2_0_API */
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/* XXX: not guarded by the EXPERIMENTAL_API defines to avoid
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* upsetting glib-mkenums, but this can still be considered implicitly
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* experimental since it's only useable with experimental API... */
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/**
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* CoglFeatureID:
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* @COGL_FEATURE_ID_TEXTURE_NPOT_BASIC: The hardware supports non power
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* of two textures, but you also need to check the
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* %COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP and %COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT
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* features to know if the hardware supports npot texture mipmaps
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* or repeat modes other than
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* %COGL_RENDERER_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE respectively.
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* @COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP: Mipmapping is supported in
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* conjuntion with non power of two textures.
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* @COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT: Repeat modes other than
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* %COGL_RENDERER_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE are supported by the
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* hardware.
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* @COGL_FEATURE_ID_TEXTURE_NPOT: Non power of two textures are supported
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* by the hardware. This is a equivalent to the
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* %COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, %COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP
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* and %COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT features combined.
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* @COGL_FEATURE_ID_TEXTURE_RECTANGLE: Support for rectangular
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* textures with non-normalized texture coordinates.
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* @COGL_FEATURE_ID_TEXTURE_3D: 3D texture support
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* @COGL_FEATURE_ID_OFFSCREEN: Offscreen rendering support
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* @COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE: Multisample support for
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* offscreen framebuffers
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* @COGL_FEATURE_ID_ONSCREEN_MULTIPLE: Multiple onscreen framebuffers
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* supported.
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* @COGL_FEATURE_ID_GLSL: GLSL support
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* @COGL_FEATURE_ID_ARBFP: ARBFP support
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* @COGL_FEATURE_ID_UNSIGNED_INT_INDICES: Set if
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* %COGL_RENDERER_INDICES_TYPE_UNSIGNED_INT is supported in
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* cogl_indices_new().
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* @COGL_FEATURE_ID_DEPTH_RANGE: cogl_pipeline_set_depth_range() support
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* @COGL_FEATURE_ID_POINT_SPRITE: Whether
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* cogl_pipeline_set_layer_point_sprite_coords_enabled() is supported.
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* @COGL_FEATURE_ID_MAP_BUFFER_FOR_READ: Whether cogl_buffer_map() is
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* supported with CoglBufferAccess including read support.
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* @COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE: Whether cogl_buffer_map() is
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* supported with CoglBufferAccess including write support.
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* @COGL_FEATURE_ID_MIRRORED_REPEAT: Whether
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* %COGL_PIPELINE_WRAP_MODE_MIRRORED_REPEAT is supported.
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* @COGL_FEATURE_ID_SWAP_BUFFERS_EVENT:
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* Available if the window system supports reporting an event
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* for swap buffer completions.
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* @COGL_FEATURE_ID_GLES2_CONTEXT: Whether creating new GLES2 contexts is
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* suported.
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* @COGL_FEATURE_ID_DEPTH_TEXTURE: Whether #CoglFramebuffer support rendering
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* the depth buffer to a texture.
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*
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* All the capabilities that can vary between different GPUs supported
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* by Cogl. Applications that depend on any of these features should explicitly
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* check for them using cogl_has_feature() or cogl_has_features().
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*
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* Since: 1.10
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*/
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typedef enum _CoglFeatureID
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{
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC = 1,
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COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP,
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COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT,
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COGL_FEATURE_ID_TEXTURE_NPOT,
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COGL_FEATURE_ID_TEXTURE_RECTANGLE,
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COGL_FEATURE_ID_TEXTURE_3D,
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COGL_FEATURE_ID_GLSL,
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COGL_FEATURE_ID_ARBFP,
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COGL_FEATURE_ID_OFFSCREEN,
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COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE,
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COGL_FEATURE_ID_ONSCREEN_MULTIPLE,
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COGL_FEATURE_ID_UNSIGNED_INT_INDICES,
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COGL_FEATURE_ID_DEPTH_RANGE,
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COGL_FEATURE_ID_POINT_SPRITE,
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COGL_FEATURE_ID_MAP_BUFFER_FOR_READ,
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COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE,
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COGL_FEATURE_ID_MIRRORED_REPEAT,
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COGL_FEATURE_ID_SWAP_BUFFERS_EVENT,
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COGL_FEATURE_ID_GLES2_CONTEXT,
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COGL_FEATURE_ID_DEPTH_TEXTURE,
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/*< private > */
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_COGL_N_FEATURE_IDS
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} CoglFeatureID;
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#ifdef COGL_ENABLE_EXPERIMENTAL_API
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/**
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* cogl_has_feature:
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* @context: A #CoglContext pointer
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* @feature: A #CoglFeatureID
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*
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* Checks if a given @feature is currently available
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*
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* Cogl does not aim to be a lowest common denominator API, it aims to
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* expose all the interesting features of GPUs to application which
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* means applications have some responsibility to explicitly check
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* that certain features are available before depending on them.
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*
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* Returns: %TRUE if the @feature is currently supported or %FALSE if
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* not.
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*
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* Since: 1.10
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* Stability: unstable
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*/
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CoglBool
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cogl_has_feature (CoglContext *context, CoglFeatureID feature);
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/**
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* cogl_has_features:
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* @context: A #CoglContext pointer
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* @...: A 0 terminated list of CoglFeatureID<!-- -->s
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*
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* Checks if a list of features are all currently available.
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*
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* This checks all of the listed features using cogl_has_feature() and
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* returns %TRUE if all the features are available or %FALSE
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* otherwise.
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*
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* Return value: %TRUE if all the features are available, %FALSE
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* otherwise.
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*
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* Since: 1.10
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* Stability: unstable
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*/
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CoglBool
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cogl_has_features (CoglContext *context, ...);
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/**
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* CoglFeatureCallback:
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* @feature: A single feature currently supported by Cogl
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* @user_data: A private pointer passed to cogl_foreach_feature().
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*
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* A callback used with cogl_foreach_feature() for enumerating all
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* context level features supported by Cogl.
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*
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* Since: 0.10
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* Stability: unstable
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*/
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typedef void (*CoglFeatureCallback) (CoglFeatureID feature, void *user_data);
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/**
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* cogl_foreach_feature:
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* @context: A #CoglContext pointer
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* @callback: A #CoglFeatureCallback called for each supported feature
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* @user_data: Private data to pass to the callback
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*
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* Iterates through all the context level features currently supported
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* for a given @context and for each feature @callback is called.
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*
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* Since: 1.10
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* Stability: unstable
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*/
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void
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cogl_foreach_feature (CoglContext *context,
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CoglFeatureCallback callback,
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void *user_data);
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#endif /* COGL_ENABLE_EXPERIMENTAL_API */
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G_END_DECLS
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#endif /* __COGL_CONTEXT_H__ */
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