[692] | 1 | /*
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| 2 | -----------------------------------------------------------------------------
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| 3 | This source file is part of OGRE
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| 4 | (Object-oriented Graphics Rendering Engine)
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| 5 | For the latest info, see http://www.ogre3d.org/
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| 6 |
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| 7 | Copyright (c) 2000-2005 The OGRE Team
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| 8 | Also see acknowledgements in Readme.html
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify it under
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software
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| 12 | Foundation; either version 2 of the License, or (at your option) any later
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| 13 | version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT
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| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License along with
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| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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| 22 | http://www.gnu.org/copyleft/lesser.txt.
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| 23 | -----------------------------------------------------------------------------
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| 24 | */
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| 25 | #ifndef __GLPIXELFORMAT_H__
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| 26 | #define __GLPIXELFORMAT_H__
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| 27 |
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| 28 | #include "OgreGLPrerequisites.h"
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| 29 | #include "OgrePixelFormat.h"
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| 30 | namespace Ogre {
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| 31 |
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| 32 | /**
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| 33 | * Class to do pixel format mapping between GL and OGRE
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| 34 | */
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| 35 | class GLPixelUtil {
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| 36 | public:
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| 37 | /** Takes the OGRE pixel format and returns the appropriate GL one
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| 38 | @returns a GLenum describing the format, or 0 if there is no exactly matching
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| 39 | one (and conversion is needed)
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| 40 | */
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| 41 | static GLenum getGLOriginFormat(PixelFormat mFormat);
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| 42 |
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| 43 | /** Takes the OGRE pixel format and returns type that must be provided
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| 44 | to GL as data type for reading it into the GPU
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| 45 | @returns a GLenum describing the data type, or 0 if there is no exactly matching
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| 46 | one (and conversion is needed)
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| 47 | */
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| 48 | static GLenum getGLOriginDataType(PixelFormat mFormat);
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| 49 |
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| 50 | /** Takes the OGRE pixel format and returns the type that must be provided
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| 51 | to GL as internal format. GL_NONE if no match exists.
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| 52 | */
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| 53 | static GLenum getGLInternalFormat(PixelFormat mFormat);
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| 54 |
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| 55 | /** Takes the OGRE pixel format and returns the type that must be provided
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| 56 | to GL as internal format. If no match exists, returns the closest match.
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| 57 | */
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| 58 | static GLenum getClosestGLInternalFormat(PixelFormat mFormat);
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| 59 |
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| 60 | /** Function to get the closest matching OGRE format to an internal GL format. To be
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| 61 | precise, the format will be chosen that is most efficient to transfer to the card
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| 62 | without losing precision.
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| 63 | @remarks It is valid for this function to always return PF_A8R8G8B8.
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| 64 | */
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| 65 | static PixelFormat getClosestOGREFormat(GLenum fmt);
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| 66 |
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| 67 | /** Returns the maximum number of Mipmaps that can be generated until we reach
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| 68 | the mininum format possible. This does not count the base level.
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| 69 | @param width
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| 70 | The width of the area
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| 71 | @param height
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| 72 | The height of the area
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| 73 | @param depth
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| 74 | The depth of the area
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| 75 | @param format
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| 76 | The format of the area
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| 77 | @remarks
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| 78 | In case that the format is non-compressed, this simply returns
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| 79 | how many times we can divide this texture in 2 until we reach 1x1.
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| 80 | For compressed formats, constraints apply on minimum size and alignment
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| 81 | so this might differ.
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| 82 | */
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| 83 | static size_t getMaxMipmaps(size_t width, size_t height, size_t depth, PixelFormat format);
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| 84 |
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| 85 | /** Returns next power-of-two size if required by render system, in case
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| 86 | RSC_NON_POWER_OF_2_TEXTURES is supported it returns value as-is.
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| 87 | */
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| 88 | static size_t optionalPO2(size_t value);
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| 89 | };
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| 90 | };
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| 91 |
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| 92 | #endif
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