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864e5562df
Argument names and @$arg suffered from various little mismatches, fix them in a batch commit. (cherry picked from commit d2ac3c5a88d980e7519c98bd261111b93cf73a6e)
375 lines
12 KiB
C
375 lines
12 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) 2011 Collabora Ltd.
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* Copyright (C) 2012 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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* Tomeu Vizoso <tomeu.vizoso@collabora.com>
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* Robert Bragg <robert@linux.intel.com>
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*
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*/
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#ifndef __COGL_GLES2_H__
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#define __COGL_GLES2_H__
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#define __COGL_H_INSIDE__
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#include <cogl/cogl-defines.h>
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#include <cogl/cogl-context.h>
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#include <cogl/cogl-framebuffer.h>
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#include <cogl/cogl-texture.h>
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#include <cogl/cogl-texture-2d.h>
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/* CoglGLES2Vtable depends on GLES 2.0 typedefs being available but we
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* want to be careful that the public api doesn't expose arbitrary
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* system GL headers as part of the Cogl API so although when building
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* internally we consistently refer to the system headers to avoid
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* conflicts we only expose the minimal set of GLES 2.0 types and enums
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* publicly.
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*/
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#ifdef COGL_COMPILATION
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#include "cogl-gl-header.h"
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#else
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#include <cogl/cogl-gles2-types.h>
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#endif
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COGL_BEGIN_DECLS
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/**
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* SECTION:cogl-gles2
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* @short_description: A portable api to access OpenGLES 2.0
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*
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* Cogl provides portable access to the OpenGLES api through a single
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* library that is able to smooth over inconsistencies between the
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* different vendor drivers for OpenGLES in a single place.
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*
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* The api is designed to allow Cogl to transparently implement the
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* api on top of other drivers, such as OpenGL, D3D or on Cogl's own
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* drawing api so even if your platform doesn't come with an
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* OpenGLES 2.0 api Cogl may still be able to expose the api to your
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* application.
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*
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* Since Cogl is a library and not an api specification it is possible
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* to add OpenGLES 2.0 api features to Cogl which can immidiately
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* benefit developers regardless of what platform they are running on.
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*
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* With this api it's possible to re-use existing OpenGLES 2.0 code
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* within applications that are rendering with the Cogl API and also
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* it's possible for applications that render using OpenGLES 2.0 to
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* incorporate content rendered with Cogl.
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*
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* Applications can check for OpenGLES 2.0 api support by checking for
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* %COGL_FEATURE_ID_GLES2_CONTEXT support with cogl_has_feature().
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*
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* Since: 1.12
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* Stability: unstable
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*/
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/**
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* CoglGLES2Context:
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*
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* Represents an OpenGLES 2.0 api context used as a sandbox for
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* OpenGLES 2.0 state. This is comparable to an EGLContext for those
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* who have used OpenGLES 2.0 with EGL before.
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*
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* Since: 1.12
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* Stability: unstable
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*/
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typedef struct _CoglGLES2Context CoglGLES2Context;
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/**
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* CoglGLES2Vtable:
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*
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* Provides function pointers for the full OpenGLES 2.0 api. The
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* api must be accessed this way and not by directly calling
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* symbols of any system OpenGLES 2.0 api.
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*
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* Since: 1.12
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* Stability: unstable
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*/
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typedef struct _CoglGLES2Vtable CoglGLES2Vtable;
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struct _CoglGLES2Vtable
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{
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/*< private >*/
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#define COGL_EXT_BEGIN(name, \
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min_gl_major, min_gl_minor, \
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gles_availability, \
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extension_suffixes, extension_names)
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#define COGL_EXT_FUNCTION(ret, name, args) \
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ret (* name) args;
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#define COGL_EXT_END()
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#include <cogl/gl-prototypes/cogl-gles2-functions.h>
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#undef COGL_EXT_BEGIN
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#undef COGL_EXT_FUNCTION
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#undef COGL_EXT_END
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};
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uint32_t
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_cogl_gles2_context_error_quark (void);
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/**
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* COGL_GLES2_CONTEXT_ERROR:
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*
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* An error domain for runtime exceptions relating to the
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* cogl_gles2_context api.
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*
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* Since: 2.0
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* Stability: unstable
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*/
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#define COGL_GLES2_CONTEXT_ERROR (_cogl_gles2_context_error_quark ())
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/**
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* CoglGLES2ContextError:
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* @COGL_GLES2_CONTEXT_ERROR_UNSUPPORTED: Creating GLES2 contexts
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* isn't supported. Applications should use cogl_has_feature() to
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* check for the %COGL_FEATURE_ID_GLES2_CONTEXT.
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* @COGL_GLES2_CONTEXT_ERROR_DRIVER: An underlying driver error
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* occured.
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*
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* Error codes that relate to the cogl_gles2_context api.
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*/
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typedef enum { /*< prefix=COGL_GLES2_CONTEXT_ERROR >*/
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COGL_GLES2_CONTEXT_ERROR_UNSUPPORTED,
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COGL_GLES2_CONTEXT_ERROR_DRIVER
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} CoglGLES2ContextError;
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/**
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* cogl_gles2_context_new:
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* @ctx: A #CoglContext
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* @error: A pointer to a #CoglError for returning exceptions
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*
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* Allocates a new OpenGLES 2.0 context that can be used to render to
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* #CoglOffscreen framebuffers (Rendering to #CoglOnscreen
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* framebuffers is not currently supported).
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*
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* To actually access the OpenGLES 2.0 api itself you need to use
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* cogl_gles2_context_get_vtable(). You should not try to directly link
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* to and use the symbols provided by the a system OpenGLES 2.0
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* driver.
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*
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* Once you have allocated an OpenGLES 2.0 context you can make it
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* current using cogl_push_gles2_context(). For those familiar with
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* using the EGL api, this serves a similar purpose to eglMakeCurrent.
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*
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* <note>Before using this api applications can check for OpenGLES 2.0
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* api support by checking for %COGL_FEATURE_ID_GLES2_CONTEXT support
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* with cogl_has_feature(). This function will return %FALSE and
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* return an %COGL_GLES2_CONTEXT_ERROR_UNSUPPORTED error if the
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* feature isn't available.</note>
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*
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* Since: 2.0
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* Return value: A newly allocated #CoglGLES2Context or %NULL if there
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* was an error and @error will be updated in that case.
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* Stability: unstable
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*/
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CoglGLES2Context *
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cogl_gles2_context_new (CoglContext *ctx, CoglError **error);
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/**
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* cogl_gles2_context_get_vtable:
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* @gles2_ctx: A #CoglGLES2Context allocated with
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* cogl_gles2_context_new()
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*
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* Queries the OpenGLES 2.0 api function pointers that should be
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* used for rendering with the given @gles2_ctx.
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*
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* <note>You should not try to directly link to and use the symbols
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* provided by any system OpenGLES 2.0 driver.</note>
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*
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* Since: 2.0
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* Return value: A pointer to a #CoglGLES2Vtable providing pointers
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* to functions for the full OpenGLES 2.0 api.
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* Stability: unstable
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*/
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const CoglGLES2Vtable *
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cogl_gles2_context_get_vtable (CoglGLES2Context *gles2_ctx);
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/**
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* cogl_push_gles2_context:
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* @ctx: A #CoglContext
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* @gles2_ctx: A #CoglGLES2Context allocated with
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* cogl_gles2_context_new()
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* @read_buffer: A #CoglFramebuffer to access to read operations
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* such as glReadPixels. (must be a #CoglOffscreen
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* framebuffer currently)
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* @write_buffer: A #CoglFramebuffer to access for drawing operations
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* such as glDrawArrays. (must be a #CoglOffscreen
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* framebuffer currently)
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* @error: A pointer to a #CoglError for returning exceptions
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*
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* Pushes the given @gles2_ctx onto a stack associated with @ctx so
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* that the OpenGLES 2.0 api can be used instead of the Cogl
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* rendering apis to read and write to the specified framebuffers.
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*
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* Usage of the api available through a #CoglGLES2Vtable is only
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* allowed between cogl_push_gles2_context() and
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* cogl_pop_gles2_context() calls.
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*
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* If there is a runtime problem with switching over to the given
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* @gles2_ctx then this function will return %FALSE and return
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* an error through @error.
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*
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* Since: 2.0
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* Return value: %TRUE if operation was successfull or %FALSE
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* otherwise and @error will be updated.
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* Stability: unstable
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*/
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CoglBool
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cogl_push_gles2_context (CoglContext *ctx,
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CoglGLES2Context *gles2_ctx,
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CoglFramebuffer *read_buffer,
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CoglFramebuffer *write_buffer,
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CoglError **error);
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/**
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* cogl_pop_gles2_context:
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* @ctx: A #CoglContext
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*
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* Restores the previously active #CoglGLES2Context if there
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* were nested calls to cogl_push_gles2_context() or otherwise
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* restores the ability to render with the Cogl api instead
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* of OpenGLES 2.0.
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*
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* The behaviour is undefined if calls to cogl_pop_gles2_context()
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* are not balenced with the number of corresponding calls to
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* cogl_push_gles2_context().
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*
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* Since: 2.0
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* Stability: unstable
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*/
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void
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cogl_pop_gles2_context (CoglContext *ctx);
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/**
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* cogl_gles2_get_current_vtable:
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*
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* Returns the OpenGL ES 2.0 api vtable for the currently pushed
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* #CoglGLES2Context (last pushed with cogl_push_gles2_context()) or
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* %NULL if no #CoglGLES2Context has been pushed.
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*
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* Return value: The #CoglGLES2Vtable for the currently pushed
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* #CoglGLES2Context or %NULL if none has been pushed.
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* Since: 2.0
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* Stability: unstable
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*/
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CoglGLES2Vtable *
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cogl_gles2_get_current_vtable (void);
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/**
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* cogl_gles2_texture_2d_new_from_handle:
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* @ctx: A #CoglContext
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* @gles2_ctx: A #CoglGLES2Context allocated with
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* cogl_gles2_context_new()
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* @handle: An OpenGL ES 2.0 texture handle created with
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* glGenTextures()
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* @width: Width of the texture to allocate
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* @height: Height of the texture to allocate
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* @internal_format: The format of the texture
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* @error: A #CoglError for exceptions
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*
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* Creates a #CoglTexture2D from an OpenGL ES 2.0 texture handle that
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* was created within the given @gles2_ctx via glGenTextures(). The
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* texture needs to have been associated with the GL_TEXTURE_2D target.
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*
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* <note>This interface is only intended for sharing textures to read
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* from. The behaviour is undefined if the texture is modified using
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* the Cogl api.</note>
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*
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* <note>Applications should only pass this function handles that were
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* created via a #CoglGLES2Vtable or via libcogl-gles2 and not pass
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* handles created directly using the system's native libGLESv2
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* api.</note>
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*
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* Since: 2.0
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* Stability: unstable
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*/
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CoglTexture2D *
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cogl_gles2_texture_2d_new_from_handle (CoglContext *ctx,
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CoglGLES2Context *gles2_ctx,
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unsigned int handle,
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int width,
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int height,
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CoglPixelFormat internal_format,
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CoglError **error);
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/**
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* cogl_gles2_texture_get_handle:
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* @texture: A #CoglTexture
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* @handle: A return location for an OpenGL ES 2.0 texture handle
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* @target: A return location for an OpenGL ES 2.0 texture target
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*
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* Gets an OpenGL ES 2.0 texture handle for a #CoglTexture that can
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* then be referenced by a #CoglGLES2Context. As well as returning
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* a texture handle the texture's target (such as GL_TEXTURE_2D) is
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* also returned.
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*
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* If the #CoglTexture can not be shared with a #CoglGLES2Context then
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* this function will return %FALSE.
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*
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* This api does not affect the lifetime of the CoglTexture and you
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* must take care not to reference the returned handle after the
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* original texture has been freed.
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*
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* <note>This interface is only intended for sharing textures to read
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* from. The behaviour is undefined if the texture is modified by a
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* GLES2 context.</note>
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*
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* <note>This function will only return %TRUE for low-level
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* #CoglTexture<!-- -->s such as #CoglTexture2D or #CoglTexture3D but
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* not for high level meta textures such as
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* #CoglTexture2DSliced</note>
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*
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* <note>The handle returned should not be passed directly to a system
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* OpenGL ES 2.0 library, the handle is only intended to be used via
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* a #CoglGLES2Vtable or via libcogl-gles2.</note>
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*
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* Return value: %TRUE if a handle and target could be returned
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* otherwise %FALSE is returned.
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* Since: 2.0
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* Stability: unstable
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*/
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CoglBool
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cogl_gles2_texture_get_handle (CoglTexture *texture,
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unsigned int *handle,
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unsigned int *target);
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/**
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* cogl_is_gles2_context:
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* @object: A #CoglObject pointer
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*
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* Gets whether the given object references a #CoglGLES2Context.
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*
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* Return value: %TRUE if the object references a #CoglGLES2Context
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* and %FALSE otherwise.
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* Since: 2.0
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* Stability: unstable
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*/
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CoglBool
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cogl_is_gles2_context (void *object);
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COGL_END_DECLS
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#endif /* __COGL_GLES2_H__ */
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