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bb3a008318
Cogl's support for offscreen rendering was originally written just to support
the clutter_texture_new_from_actor API and due to lack of documentation and
several confusing - non orthogonal - side effects of using the API it wasn't
really possible to use directly.
This commit does a number of things:
- It removes {gl,gles}/cogl-fbo.{c,h} and adds shared cogl-draw-buffer.{c,h}
files instead which should be easier to maintain.
- internally CoglFbo objects are now called CoglDrawBuffers. A
CoglDrawBuffer is an abstract base class that is inherited from to
implement CoglOnscreen and CoglOffscreen draw buffers. CoglOffscreen draw
buffers will initially be used to support the
cogl_offscreen_new_to_texture API, and CoglOnscreen draw buffers will
start to be used internally to represent windows as we aim to migrate some
of Clutter's backend code to Cogl.
- It makes draw buffer objects the owners of the following state:
- viewport
- projection matrix stack
- modelview matrix stack
- clip state
(This means when you switch between draw buffers you will automatically be
switching to their associated viewport, matrix and clip state)
Aside from hopefully making cogl_offscreen_new_to_texture be more useful
short term by having simpler and well defined semantics for
cogl_set_draw_buffer, as mentioned above this is the first step for a couple
of other things:
- Its a step toward moving ownership for windows down from Clutter backends
into Cogl, by (internally at least) introducing the CoglOnscreen draw
buffer. Note: the plan is that cogl_set_draw_buffer will accept on or
offscreen draw buffer handles, and the "target" argument will become
redundant since we will instead query the type of the given draw buffer
handle.
- Because we have a common type for on and offscreen framebuffers we can
provide a unified API for framebuffer management. Things like:
- blitting between buffers
- managing ancillary buffers (e.g. attaching depth and stencil buffers)
- size requisition
- clearing
52 lines
1.9 KiB
C
52 lines
1.9 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) 2007,2008,2009 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __COGL_CONTEXT_DRIVER_H
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#define __COGL_CONTEXT_DRIVER_H
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#include "cogl.h"
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#include "cogl-gles2-wrapper.h"
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typedef struct _CoglContextDriver
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{
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COGL_PFNGLGENRENDERBUFFERSPROC pf_glGenRenderbuffers;
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COGL_PFNGLDELETERENDERBUFFERSPROC pf_glDeleteRenderbuffers;
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COGL_PFNGLBINDRENDERBUFFERPROC pf_glBindRenderbuffer;
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COGL_PFNGLRENDERBUFFERSTORAGEPROC pf_glRenderbufferStorage;
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COGL_PFNGLGENFRAMEBUFFERSPROC pf_glGenFramebuffers;
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COGL_PFNGLBINDFRAMEBUFFERPROC pf_glBindFramebuffer;
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COGL_PFNGLFRAMEBUFFERTEXTURE2DPROC pf_glFramebufferTexture2D;
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COGL_PFNGLFRAMEBUFFERRENDERBUFFERPROC pf_glFramebufferRenderbuffer;
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COGL_PFNGLCHECKFRAMEBUFFERSTATUSPROC pf_glCheckFramebufferStatus;
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COGL_PFNGLDELETEFRAMEBUFFERSPROC pf_glDeleteFramebuffers;
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COGL_PFNGLGENERATEMIPMAPPROC pf_glGenerateMipmap;
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#ifdef HAVE_COGL_GLES2
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CoglGles2Wrapper gles2;
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#endif
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} CoglContextDriver;
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#endif /* __COGL_CONTEXT_DRIVER_H */
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