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When creating a Cogl sub-texture, if the full texture is also a sub texture it will now just offset the x and y and reference the full texture instead. This avoids one level of indirection when rendering the texture which reduces the chances of getting rounding errors in the calculations.
71 lines
2.3 KiB
C
71 lines
2.3 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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/* This is the texture that was passed in to
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_cogl_sub_texture_new. If this is also a sub texture then we will
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use the full texture from that to render instead of making a
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chain. However we want to preserve the next texture in case the
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user is expecting us to keep a reference and also so that we can
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later add a cogl_sub_texture_get_full_texture() function. */
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CoglHandle next_texture;
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/* This is the texture that will actually be used to draw. It will
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point to the end of the chain if a sub texture of a sub texture
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is created */
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CoglHandle full_texture;
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/* The region represented by this sub-texture. This is the region of
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full_texture which won't necessarily be the same as the region
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passed to _cogl_sub_texture_new if next_texture is actually
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already a sub texture */
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int sub_x;
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int sub_y;
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int sub_width;
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int sub_height;
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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 next_texture,
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int sub_x,
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int sub_y,
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int sub_width,
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int sub_height);
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#endif /* __COGL_SUB_TEXTURE_H */
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