2f4a68c8c3
The order and way include macros were structured was chaotic, with no real common thread between files. Try to tidy up the mess with some common scheme, to make things look less messy.
67 lines
2.8 KiB
C
67 lines
2.8 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* MetaTextureTower
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*
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* Mipmap emulation by creation of scaled down images
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*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __META_TEXTURE_TOWER_H__
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#define __META_TEXTURE_TOWER_H__
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#include "clutter/clutter.h"
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G_BEGIN_DECLS
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/**
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* SECTION:MetaTextureTower
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* @short_description: mipmap emulation by creation of scaled down images
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*
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* A #MetaTextureTower is used to get good looking scaled down images when
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* we can't use the GL drivers mipmap support. There are two separate reasons
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*
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* - Some cards (including radeon cards <= r5xx) only support
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* TEXTURE_RECTANGLE_ARB and not NPOT textures. Rectangular textures
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* are defined not to support mipmapping.
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* - Even when NPOT textures are available, the combination of NPOT
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* textures, texture_from_pixmap, and mipmapping doesn't typically
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* work, since the X server doesn't allocate pixmaps in the right
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* layout for mipmapping.
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*
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* So, what we do is create the "mipmap" levels ourselves by successive
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* power-of-two scaledowns, and when rendering pick the single texture
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* that best matches the scale we are rendering at. (Since we aren't
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* typically using perspective transforms, we'll frequently have a single
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* scale for the entire texture.)
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*/
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typedef struct _MetaTextureTower MetaTextureTower;
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MetaTextureTower *meta_texture_tower_new (void);
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void meta_texture_tower_free (MetaTextureTower *tower);
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void meta_texture_tower_set_base_texture (MetaTextureTower *tower,
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CoglTexture *texture);
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void meta_texture_tower_update_area (MetaTextureTower *tower,
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int x,
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int y,
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int width,
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int height);
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CoglTexture *meta_texture_tower_get_paint_texture (MetaTextureTower *tower);
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G_END_DECLS
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#endif /* __META_TEXTURE_TOWER_H__ */
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