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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#ifndef _TextureManager_H__
#define _TextureManager_H__


#include "OgrePrerequisites.h"

#include "OgreResourceManager.h"
#include "OgreTexture.h"
#include "OgreSingleton.h"


namespace Ogre {

    /** Class for loading & managing textures.
        @remarks
            Note that this class is abstract - the particular
            RenderSystem that is in use at the time will create
            a concrete subclass of this. Note that the concrete
            class will be available via the abstract singleton
            obtained from TextureManager::getSingleton(), but
            you should not assume that it is available until you
            have a) initialised Ogre (after selecting a RenderSystem
            and calling initialise from the Root object), and b)
            created at least one window - this may be done at the
            same time as part a if you allow Ogre to autocreate one.
     */
    class _OgreExport TextureManager : public ResourceManager, public Singleton<TextureManager>
    {
    public:

        TextureManager(void);
        virtual ~TextureManager();

        /** Loads a texture from a file.
            @param
                name The file to load, or a String identifier in some cases
            @param
                group The name of the resource group to assign the texture to
            @param
                texType The type of texture to load/create, defaults to normal 2D textures
            @param
                numMipmaps The number of pre-filtered mipmaps to generate. If left to MIP_DEFAULT then
                the TextureManager's default number of mipmaps will be used (see setDefaultNumMipmaps())
				If set to MIP_UNLIMITED mipmaps will be generated until the lowest possible
				level, 1x1x1.
            @param
                gamma The gamma adjustment factor to apply to this texture (brightening/darkening)
			@param 
				isAlpha Only applicable to greyscale images. If true, specifies that
				the image should be loaded into an alpha texture rather than a
				single channel colour texture - useful for fixed-function systems.
			@param 
				desiredFormat The format you would like to have used instead of
				the format being based on the contents of the texture
        */
        virtual TexturePtr load( 
            const String& name, const String& group, 
            TextureType texType = TEX_TYPE_2D, int numMipmaps = MIP_DEFAULT, 
            Real gamma = 1.0f, bool isAlpha = false,
            PixelFormat desiredFormat = PF_UNKNOWN);

        /** Loads a texture from an Image object.
            @note
                The texture will create as manual texture without loader.
            @param
                name The name to give the resulting texture
            @param
                group The name of the resource group to assign the texture to
            @param
                img The Image object which contains the data to load
            @param
                texType The type of texture to load/create, defaults to normal 2D textures
            @param
                numMipmaps The number of pre-filtered mipmaps to generate. If left to MIP_DEFAULT then
                the TextureManager's default number of mipmaps will be used (see setDefaultNumMipmaps())
				If set to MIP_UNLIMITED mipmaps will be generated until the lowest possible
				level, 1x1x1.
            @param
                gamma The gamma adjustment factor to apply to this texture (brightening/darkening)
			@param 
				isAlpha Only applicable to greyscale images. If true, specifies that
				the image should be loaded into an alpha texture rather than a
				single channel colour texture - useful for fixed-function systems.
			@param 
				desiredFormat The format you would like to have used instead of
				the format being based on the contents of the texture
        */
        virtual TexturePtr loadImage( 
            const String &name, const String& group, const Image &img, 
            TextureType texType = TEX_TYPE_2D,
            int iNumMipmaps = MIP_DEFAULT, Real gamma = 1.0f, bool isAlpha = false,
            PixelFormat desiredFormat = PF_UNKNOWN);
			
        /** Loads a texture from a raw data stream.
            @note
                The texture will create as manual texture without loader.
            @param
                name The name to give the resulting texture
            @param
                group The name of the resource group to assign the texture to
            @param
                stream Incoming data stream
            @param
                width, height The dimensions of the texture
            @param
                format The format of the data being passed in; the manager reserves
                the right to create a different format for the texture if the 
                original format is not available in this context.
            @param
                texType The type of texture to load/create, defaults to normal 2D textures
            @param
                numMipmaps The number of pre-filtered mipmaps to generate. If left to MIP_DEFAULT then
                the TextureManager's default number of mipmaps will be used (see setDefaultNumMipmaps())
				If set to MIP_UNLIMITED mipmaps will be generated until the lowest possible
				level, 1x1x1.
            @param
                gamma The gamma adjustment factor to apply to this texture (brightening/darkening)
        */
        virtual TexturePtr loadRawData(const String &name, const String& group,
            DataStreamPtr& stream, ushort uWidth, ushort uHeight, 
            PixelFormat format, TextureType texType = TEX_TYPE_2D, 
            int iNumMipmaps = MIP_DEFAULT, Real gamma = 1.0f);

		/** Create a manual texture with specified width, height and depth (not loaded from a file).
            @param
                name The name to give the resulting texture
            @param
                group The name of the resource group to assign the texture to
            @param
                texType The type of texture to load/create, defaults to normal 2D textures
            @param
                width, height, depth The dimensions of the texture
            @param
                numMipmaps The number of pre-filtered mipmaps to generate. If left to MIP_DEFAULT then
                the TextureManager's default number of mipmaps will be used (see setDefaultNumMipmaps())
				If set to MIP_UNLIMITED mipmaps will be generated until the lowest possible
				level, 1x1x1.
            @param
                format The internal format you wish to request; the manager reserves
                the right to create a different format if the one you select is
                not available in this context.
			@param 
				usage The kind of usage this texture is intended for. It 
				is a combination of TU_STATIC, TU_DYNAMIC, TU_WRITE_ONLY, 
				TU_AUTOMIPMAP and TU_RENDERTARGET (see TextureUsage enum). You are
            	strongly advised to use HBU_STATIC_WRITE_ONLY wherever possible, if you need to 
            	update regularly, consider HBU_DYNAMIC_WRITE_ONLY.
            @param
                loader If you intend the contents of the manual texture to be 
                regularly updated, to the extent that you don't need to recover 
                the contents if the texture content is lost somehow, you can leave
                this parameter as 0. However, if you intend to populate the
                texture only once, then you should implement ManualResourceLoader
                and pass a pointer to it in this parameter; this means that if the
                manual texture ever needs to be reloaded, the ManualResourceLoader
                will be called to do it.
        */
        virtual TexturePtr createManual(const String & name, const String& group,
            TextureType texType, uint width, uint height, uint depth, 
			int num_mips, PixelFormat format, int usage = TU_DEFAULT, ManualResourceLoader* loader = 0 );
			
        /** Create a manual texture with a depth of 1 (not loaded from a file).
            @param
                name The name to give the resulting texture
            @param
                group The name of the resource group to assign the texture to
            @param
                texType The type of texture to load/create, defaults to normal 2D textures
            @param
                width, height The dimensions of the texture
            @param
                numMipmaps The number of pre-filtered mipmaps to generate. If left to MIP_DEFAULT then
                the TextureManager's default number of mipmaps will be used (see setDefaultNumMipmaps()).
				If set to MIP_UNLIMITED mipmaps will be generated until the lowest possible
				level, 1x1x1.
            @param
                format The internal format you wish to request; the manager reserves
                the right to create a different format if the one you select is
                not available in this context.
			@param 
				usage The kind of usage this texture is intended for. It 
				is a combination of TU_STATIC, TU_DYNAMIC, TU_WRITE_ONLY, 
				TU_AUTOMIPMAP and TU_RENDERTARGET (see TextureUsage enum). You are
            	strongly advised to use HBU_STATIC_WRITE_ONLY wherever possible, if you need to 
            	update regularly, consider HBU_DYNAMIC_WRITE_ONLY.
            @param
                loader If you intend the contents of the manual texture to be 
                regularly updated, to the extent that you don't need to recover 
                the contents if the texture content is lost somehow, you can leave
                this parameter as 0. However, if you intend to populate the
                texture only once, then you should implement ManualResourceLoader
                and pass a pointer to it in this parameter; this means that if the
                manual texture ever needs to be reloaded, the ManualResourceLoader
                will be called to do it.
        */
        TexturePtr createManual(const String & name, const String& group,
            TextureType texType, uint width, uint height, int num_mips,
            PixelFormat format, int usage = TU_DEFAULT, ManualResourceLoader* loader = 0 )
		{
			return createManual(name, group, texType, width, height, 1, 
				num_mips, format, usage, loader);
		}

        /** Sets preferred bit depth for integer pixel format textures.
        @param
            bits Number of bits. Available values: 0, 16 and 32, where 0 (the default) means keep
            original format as it is. This value is number of bits for the pixel.
        @param
            reloadTextures If true (the default), will reloading all reloadable textures.
        */
        virtual void setPreferredIntegerBitDepth(ushort bits, bool reloadTextures = true);

        /** gets preferred bit depth for integer pixel format textures.
        */
        virtual ushort getPreferredIntegerBitDepth(void) const;

        /** Sets preferred bit depth for float pixel format textures.
        @param
            bits Number of bits. Available values: 0, 16 and 32, where 0 (the default) means keep
            original format as it is. This value is number of bits for a channel of the pixel.
        @param
            reloadTextures If true (the default), will reloading all reloadable textures.
        */
        virtual void setPreferredFloatBitDepth(ushort bits, bool reloadTextures = true);

        /** gets preferred bit depth for float pixel format textures.
        */
        virtual ushort getPreferredFloatBitDepth(void) const;

        /** Sets preferred bit depth for integer and float pixel format.
        @param
            integerBits Number of bits. Available values: 0, 16 and 32, where 0 (the default) means keep
            original format as it is. This value is number of bits for the pixel.
        @param
            floatBits Number of bits. Available values: 0, 16 and 32, where 0 (the default) means keep
            original format as it is. This value is number of bits for a channel of the pixel.
        @param
            reloadTextures If true (the default), will reloading all reloadable textures.
        */
        virtual void setPreferredBitDepths(ushort integerBits, ushort floatBits, bool reloadTextures = true);

		/** Returns whether this render system can natively support the precise texture 
			format requested with the given usage options.
		@remarks
			You can still create textures with this format even if this method returns
			false; the texture format will just be altered to one which the device does
			support.
		@note
			Sometimes the device may just slightly change the format, such as reordering the 
			channels or packing the channels differently, without it making and qualitative 
			differences to the texture. If you want to just detect whether the quality of a
			given texture will be reduced, use isEquivalentFormatSupport instead.
		@param format The pixel format requested
		@param usage The kind of usage this texture is intended for, a combination of 
			the TextureUsage flags.
		@returns true if the format is natively supported, false if a fallback would be used.
		*/
		virtual bool isFormatSupported(TextureType ttype, PixelFormat format, int usage);

		/** Returns whether this render system can support the texture format requested
			with the given usage options, or another format with no quality reduction.
		*/
		virtual bool isEquivalentFormatSupported(TextureType ttype, PixelFormat format, int usage);

		/** Gets the format which will be natively used for a requested format given the
			contraints of the current device.
		*/
		virtual PixelFormat getNativeFormat(TextureType ttype, PixelFormat format, int usage) = 0;

        /** Returns whether this render system has hardware filtering supported for the
            texture format requested with the given usage options.
        @remarks
            Not all texture format are supports filtering by the hardware, i.e. some
            cards support floating point format, but it doesn't supports filtering on
            the floating point texture at all, or only a subset floating point formats
            have flitering supported.
        @par
            In the case you want to write shader to work with floating point texture, and
            you want to produce better visual quality, it's necessary to flitering the
            texture manually in shader (potential requires four or more texture fetch
            instructions, plus several arithmetic instructions) if filtering doesn't
            supported by hardware. But in case on the hardware that supports floating
            point filtering natively, it had better to adopt this capability for
            performance (because only one texture fetch instruction are required) and
            doesn't loss visual quality.
        @par
            This method allow you queries hardware texture filtering capability to deciding
            which verion of the shader to be used. Note it's up to you to write multi-version
            shaders for support various hardware, internal engine can't do that for you
            automatically.
        @note
            Under GL, texture filtering are always supported by driver, but if it's not
            supported by hardware natively, software simulation will be used, and you
            will end up with very slow speed (less than 0.1 fps for example). To slove
            this performance problem, you must disable filtering manually (by use
            <b>filtering none</b> in the material script's texture_unit section, or
            call TextureUnitState::setTextureFiltering with TFO_NONE if populate
            material in code).
		@param ttype The texture type requested
		@param format The pixel format requested
		@param usage The kind of usage this texture is intended for, a combination of 
			the TextureUsage flags.
        @param preciseFormatOnly Whether precise or fallback format mode is used to detecting.
            In case the pixel format doesn't supported by device, false will be returned
            if in precise mode, and natively used pixel format will be actually use to
            check if in fallback mode.
		@returns true if the texture filtering is supported.
        */
        virtual bool isHardwareFilteringSupported(TextureType ttype, PixelFormat format, int usage,
            bool preciseFormatOnly = false) = 0;

        /** Sets the default number of mipmaps to be used for loaded textures, for when textures are
            loaded automatically (e.g. by Material class) or when 'load' is called with the default
            parameters by the application.
			If set to MIP_UNLIMITED mipmaps will be generated until the lowest possible
				level, 1x1x1.
            @note
                The default value is 0.
        */
        virtual void setDefaultNumMipmaps(size_t num);

        /** Gets the default number of mipmaps to be used for loaded textures.
        */
        virtual size_t getDefaultNumMipmaps()
        {
            return mDefaultNumMipmaps;
        }

        /** Override standard Singleton retrieval.
        @remarks
        Why do we do this? Well, it's because the Singleton
        implementation is in a .h file, which means it gets compiled
        into anybody who includes it. This is needed for the
        Singleton template to work, but we actually only want it
        compiled into the implementation of the class based on the
        Singleton, not all of them. If we don't change this, we get
        link errors when trying to use the Singleton-based class from
        an outside dll.
        @par
        This method just delegates to the template version anyway,
        but the implementation stays in this single compilation unit,
        preventing link errors.
        */
        static TextureManager& getSingleton(void);
        /** Override standard Singleton retrieval.
        @remarks
        Why do we do this? Well, it's because the Singleton
        implementation is in a .h file, which means it gets compiled
        into anybody who includes it. This is needed for the
        Singleton template to work, but we actually only want it
        compiled into the implementation of the class based on the
        Singleton, not all of them. If we don't change this, we get
        link errors when trying to use the Singleton-based class from
        an outside dll.
        @par
        This method just delegates to the template version anyway,
        but the implementation stays in this single compilation unit,
        preventing link errors.
        */
        static TextureManager* getSingletonPtr(void);

    protected:

        ushort mPreferredIntegerBitDepth;
        ushort mPreferredFloatBitDepth;
        size_t mDefaultNumMipmaps;
    };
}// Namespace

#endif
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