bec2600087
This adds a CoglAtlas type which is a data structure that keeps track of unused sub rectangles of a larger rectangle. There is a new atlased texture backend which uses this to put multiple textures into a single larger texture. Currently the atlas is always sized 256x256 and the textures are never moved once they are put in. Eventually it needs to be able to reorganise the atlas and grow it if necessary. It also needs to migrate the textures out of the atlas if mipmaps are required.
65 lines
2.1 KiB
C
65 lines
2.1 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) 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_ATLAS_TEXTURE_H
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#define __COGL_ATLAS_TEXTURE_H
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#include "cogl-handle.h"
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#include "cogl-texture-private.h"
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#include "cogl-atlas.h"
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#define COGL_ATLAS_TEXTURE(tex) ((CoglAtlasTexture *) tex)
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typedef struct _CoglAtlasTexture CoglAtlasTexture;
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struct _CoglAtlasTexture
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{
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CoglTexture _parent;
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/* The format that the texture is in. This isn't necessarily the
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same format as the atlas texture because we can store
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pre-multiplied and non-pre-multiplied textures together */
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CoglPixelFormat format;
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/* The rectangle that was used to add this texture to the
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atlas. This includes the 1-pixel border */
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CoglAtlasRectangle rectangle;
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/* The texture might need to be migrated out in which case this will
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be set to TRUE and sub_texture will actually be a real texture */
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gboolean in_atlas;
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/* A CoglSubTexture representing the region for easy rendering */
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CoglHandle sub_texture;
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};
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GQuark
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_cogl_handle_atlas_texture_get_type (void);
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CoglHandle
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_cogl_atlas_texture_new_from_bitmap (CoglHandle bmp_handle,
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CoglTextureFlags flags,
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CoglPixelFormat internal_format);
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#endif /* __COGL_ATLAS_TEXTURE_H */
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