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

Copyright © 2000-2002 The OGRE Team
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.
-----------------------------------------------------------------------------
*/
#ifndef __PredefinedControllers_H__
#define __PredefinedControllers_H__

#include "OgrePrerequisites.h"

#include "OgreCommon.h"
#include "OgreController.h"
#include "OgreFrameListener.h"
#include "OgreGpuProgram.h"

namespace Ogre {

    //-----------------------------------------------------------------------
    // Controller Values
    //-----------------------------------------------------------------------
    /** Predefined controller value for getting the latest frame time.
    */
    class _OgreExport FrameTimeControllerValue : public ControllerValue<Real>, public FrameListener
    {
    protected:
        Real mFrameTime;
		Real mTimeFactor;

    public:
        FrameTimeControllerValue();
        bool frameEnded(const FrameEvent &evt);
        bool frameStarted(const FrameEvent &evt);
        Real getValue(void) const;
        void setValue(Real value);
		Real getTimeFactor(void) const;
		void setTimeFactor(Real tf);
    };

    //-----------------------------------------------------------------------
    /** Predefined controller value for getting / setting the frame number of a texture layer
    */
    class _OgreExport TextureFrameControllerValue : public ControllerValue<Real>
    {
    protected:
        TextureUnitState* mTextureLayer;
    public:
        TextureFrameControllerValue(TextureUnitState* t);

        /** Gets the frame number as a parametric value in the range [0,1]
        */
        Real getValue(void) const;
        /** Sets the frame number as a parametric value in the range [0,1]; the actual frame number is value * (numFrames-1).
        */
        void setValue(Real value);

    };
    //-----------------------------------------------------------------------
    /** Predefined controller value for getting / setting a texture coordinate modifications (scales and translates).
        @remarks
            Effects can be applied to the scale or the offset of the u or v coordinates, or both. If separate
            modifications are required to u and v then 2 instances are required to control both independently, or 4
            if you ant separate u and v scales as well as separate u and v offsets.
        @par
            Because of the nature of this value, it can accept values outside the 0..1 parametric range.
    */
    class _OgreExport TexCoordModifierControllerValue : public ControllerValue<Real>
    {
    protected:
        bool mTransU, mTransV;
        bool mScaleU, mScaleV;
        bool mRotate;
        TextureUnitState* mTextureLayer;
    public:
        /** Constructor.
            @param
                t TextureUnitState to apply the modification to.
            @param
                translateU If true, the u coordinates will be translated by the modification.
            @param
                translateV If true, the v coordinates will be translated by the modification.
            @param
                scaleU If true, the u coordinates will be scaled by the modification.
            @param
                scaleV If true, the v coordinates will be scaled by the modification.
            @param
                rotate If true, the texture will be rotated by the modification.
        */
        TexCoordModifierControllerValue(TextureUnitState* t, bool translateU = false, bool translateV = false,
            bool scaleU = false, bool scaleV = false, bool rotate = false );

        Real getValue(void) const;
        void setValue(Real value);

    };

    //-----------------------------------------------------------------------
    /** Predefined controller value for setting a single floating-
	    point value in a constant paramter of a vertex or fragment program.
    @remarks
		Any value is accepted, it is propagated into the 'x'
		component of the constant register identified by the index. If you
		need to use named parameters, retrieve the index from the param
		object before setting this controller up.
	@note
		Retrieving a value from the program parameters is not currently 
		supported, therefore do not use this controller value as a source,
		only as a target.
    */
    class _OgreExport FloatGpuParameterControllerValue : public ControllerValue<Real>
    {
    protected:
		/// The parameters to access
		GpuProgramParameters* mParams;
		/// The index of the parameter to e read or set
		size_t mParamIndex;
    public:
        /** Constructor.
		    @param
				params The parameters object to access
            @param
                index The index of the parameter to be set
        */
        FloatGpuParameterControllerValue(GpuProgramParameters* params,
				size_t index );

        ~FloatGpuParameterControllerValue() {}

        Real getValue(void) const;
        void setValue(Real value);

    };
    //-----------------------------------------------------------------------
    // Controller functions
    //-----------------------------------------------------------------------

    /** Predefined controller function for dealing with animation.
    */
    class _OgreExport AnimationControllerFunction : public ControllerFunction<Real>
    {
    protected:
        Real mSeqTime;
        Real mTime;
    public:
        /** Constructor.
            @param
                sequenceTime The amount of time in seconds it takes to loop through the whole animation sequence.
            @param
                timeOffset The offset in seconds at which to start (default is start at 0)
        */
        AnimationControllerFunction(Real sequenceTime, Real timeOffset = 0.0f);

        /** Overriden function.
        */
        Real calculate(Real source);
    };

    //-----------------------------------------------------------------------
    /** Predefined controller function which simply scales an input to an output value.
    */
    class _OgreExport ScaleControllerFunction : public ControllerFunction<Real>
    {
    protected:
        Real mScale;
    public:
        /** Constructor, requires a scale factor.
            @param
                scalefactor The multipier applied to the input to produce the output.
            @param
                deltaInput If true, signifies that the input will be a delta value such that the function should
                 add it to an internal counter before calculating the output.
        */
        ScaleControllerFunction(Real scalefactor, bool deltaInput);

        /** Overriden method.
        */
        Real calculate(Real source);

    };

    //-----------------------------------------------------------------------
    /** Predefined controller function based on a waveform.
        @remarks
            A waveform function translates parametric intput to parametric output based on a wave. The factors
            affecting the function are:
            - wave type - the shape of the wave
            - base - the base value of the output from the wave
            - frequency - the speed of the wave in cycles per second
            - phase - the offset of the start of the wave, e.g. 0.5 to start half-way through the wave
            - amplitude - scales the output so that instead of lying within [0,1] it lies within [0,1] * amplitude
        @par
            Note that for simplicity of integration with the rest of the controller insfrastructure, the output of
            the wave is parametric i.e. 0..1, rather than the typical wave output of [-1,1]. To compensate for this, the
            traditional output of the wave is scaled by the following function before output:
        @par
            output = (waveoutput + 1) * 0.5
        @par
            Hence a wave output of -1 becomes 0, a wave ouput of 1 becomes 1, and a wave output of 0 becomes 0.5.
    */
    class _OgreExport WaveformControllerFunction : public ControllerFunction<Real>
    {
    protected:
        WaveformType mWaveType;
        Real mBase;
        Real mFrequency;
        Real mPhase;
        Real mAmplitude;

        /** Overridden from ControllerFunction. */
        Real getAdjustedInput(Real input);

    public:
        /** Default contructor, requires at least a wave type, other parameters can be defaulted unless required.
            @param
                deltaInput If true, signifies that the input will be a delta value such that the function should
                add it to an internal counter before calculating the output.
        */
        WaveformControllerFunction(WaveformType wType, Real base = 0, Real frequency = 1, Real phase = 0, Real amplitude = 1, bool deltaInput = true);

        /** Overriden function.
        */
        Real calculate(Real source);

    };
    //-----------------------------------------------------------------------

}

#endif
