c8ddb3b55a
Instead of directly banging GL to migrate textures the atlas now uses the CoglFramebuffer API. It will use one of four approaches; it can set up two FBOs and use _cogl_blit_framebuffer to copy between them; it can use a single target fbo and then render the source texture to the FBO using a Cogl draw call; it can use a single FBO and call glCopyTexSubImage2D; or it can fallback to reading all of the texture data back to system memory and uploading it again with a sub texture update. Previously GL calls were used directly because Cogl wasn't able to create a framebuffer without a stencil and depth buffer. However there is now an internal version of cogl_offscreen_new_to_texture which takes a set of flags to disable the two buffers. The code for blitting has now been moved into a separate file called cogl-blit.c because it has become quite long and it may be useful outside of the atlas at some point. The 4 different methods have a fixed order of preference which is: * Texture render between two FBOs * glBlitFramebuffer * glCopyTexSubImage2D * glGetTexImage + glTexSubImage2D Once a method is succesfully used it is tried first for all subsequent blits. The default default can be overridden by setting the environment variable COGL_ATLAS_DEFAULT_BLIT_MODE to one of the following values: * texture-render * framebuffer * copy-tex-sub-image * get-tex-data
89 lines
2.5 KiB
C
89 lines
2.5 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 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_BLIT_H
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#define __COGL_BLIT_H
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#include <glib.h>
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#include "cogl-handle.h"
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/* This structures and functions are used when a series of blits needs
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to be performed between two textures. In this case there are
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multiple methods we can use, most of which involve transferring
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between an FBO bound to the texture. */
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typedef struct _CoglBlitData CoglBlitData;
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typedef gboolean (* CoglBlitBeginFunc) (CoglBlitData *data);
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typedef void (* CoglBlitEndFunc) (CoglBlitData *data);
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typedef void (* CoglBlitFunc) (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height);
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typedef struct
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{
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const char *name;
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CoglBlitBeginFunc begin_func;
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CoglBlitFunc blit_func;
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CoglBlitEndFunc end_func;
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} CoglBlitMode;
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struct _CoglBlitData
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{
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CoglHandle src_tex, dst_tex;
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unsigned int src_width;
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unsigned int src_height;
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const CoglBlitMode *blit_mode;
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/* If we're not using an FBO then we g_malloc a buffer and copy the
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complete texture data in */
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unsigned char *image_data;
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CoglPixelFormat format;
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int bpp;
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};
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void
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_cogl_blit_begin (CoglBlitData *data,
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CoglHandle dst_tex,
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CoglHandle src_tex);
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void
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_cogl_blit (CoglBlitData *data,
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unsigned int src_x,
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unsigned int src_y,
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unsigned int dst_x,
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unsigned int dst_y,
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unsigned int width,
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unsigned int height);
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void
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_cogl_blit_end (CoglBlitData *data);
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#endif /* __COGL_BLIT_H */
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