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c9cafc798c
This adds a new texture backend which represents a sub texture of a larger texture. The texture is created with a reference to the full texture and a set of coordinates describing the region. The backend simply defers to the full texture for all operations and maps the coordinates to the other range. You can also use coordinates outside the range [0,1] to create a repeated version of the full texture. A new public API function called cogl_texture_new_from_sub_texture is available to create the sub texture.
57 lines
1.6 KiB
C
57 lines
1.6 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_SUB_TEXTURE_H
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#define __COGL_SUB_TEXTURE_H
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#include "cogl-handle.h"
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#include "cogl-texture-private.h"
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#define COGL_SUB_TEXTURE(tex) ((CoglSubTexture *) tex)
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typedef struct _CoglSubTexture CoglSubTexture;
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struct _CoglSubTexture
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{
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CoglTexture _parent;
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CoglHandle full_texture;
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/* The texture coordinates of the subregion of full_texture */
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gfloat tx1, ty1;
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gfloat tx2, ty2;
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/* Are all of the texture coordinates a multiple of one? */
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gboolean tex_coords_are_a_multiple;
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};
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GQuark
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_cogl_handle_sub_texture_get_type (void);
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CoglHandle
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_cogl_sub_texture_new (CoglHandle full_texture,
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gfloat tx1, gfloat ty1,
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gfloat tx2, gfloat ty2);
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#endif /* __COGL_SUB_TEXTURE_H */
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