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70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* MutterTextureTower
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef __MUTTER_TEXTURE_TOWER_H__
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#define __MUTTER_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:MutterTextureTower
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* @short_description: mipmap emulation by creation of scaled down images
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*
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* A #MutterTextureTower 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 _MutterTextureTower MutterTextureTower;
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MutterTextureTower *mutter_texture_tower_new (void);
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void mutter_texture_tower_free (MutterTextureTower *tower);
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void mutter_texture_tower_set_base_texture (MutterTextureTower *tower,
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CoglHandle texture);
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void mutter_texture_tower_update_area (MutterTextureTower *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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CoglHandle mutter_texture_tower_get_paint_texture (MutterTextureTower *tower);
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G_BEGIN_DECLS
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#endif /* __MUTTER_TEXTURE_TOWER_H__ */
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