1 /*
2 -----------------------------------------------------------------------------
3 This source file is part of OGRE
4 (Object-oriented Graphics Rendering Engine)
5 For the latest info, see http://www.ogre3d.org/
6 
7 Copyright (c) 2000-2014 Torus Knot Software Ltd
8 
9 Permission is hereby granted, free of charge, to any person obtaining a copy
10 of this software and associated documentation files (the "Software"), to deal
11 in the Software without restriction, including without limitation the rights
12 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 copies of the Software, and to permit persons to whom the Software is
14 furnished to do so, subject to the following conditions:
15 
16 The above copyright notice and this permission notice shall be included in
17 all copies or substantial portions of the Software.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 THE SOFTWARE.
26 -----------------------------------------------------------------------------
27 */
28 #include "OgreColourImageAffector.h"
29 #include "OgreParticleSystem.h"
30 #include "OgreStringConverter.h"
31 #include "OgreParticle.h"
32 #include "OgreException.h"
33 #include "OgreResourceGroupManager.h"
34 
35 namespace Ogre {
36 
37     // init statics
38     ColourImageAffector::CmdImageAdjust     ColourImageAffector::msImageCmd;
39 
40     //-----------------------------------------------------------------------
ColourImageAffector(ParticleSystem * psys)41     ColourImageAffector::ColourImageAffector(ParticleSystem* psys)
42         :ParticleAffector(psys), mColourImageLoaded(false)
43     {
44         mType = "ColourImage";
45 
46         // Init parameters
47         if (createParamDictionary("ColourImageAffector"))
48         {
49             ParamDictionary* dict = getParamDictionary();
50 
51             dict->addParameter(ParameterDef("image", "image where the colours come from", PT_STRING), &msImageCmd);
52         }
53     }
54     //-----------------------------------------------------------------------
_initParticle(Particle * pParticle)55     void ColourImageAffector::_initParticle(Particle* pParticle)
56     {
57         if (!mColourImageLoaded)
58         {
59             _loadImage();
60         }
61 
62         pParticle->mColour = mColourImage.getColourAt(0, 0, 0);
63 
64     }
65     //-----------------------------------------------------------------------
_affectParticles(ParticleSystem * pSystem,Real timeElapsed)66     void ColourImageAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
67     {
68         Particle*           p;
69         ParticleIterator    pi              = pSystem->_getIterator();
70 
71         if (!mColourImageLoaded)
72         {
73             _loadImage();
74         }
75 
76         int                width            = (int)mColourImage.getWidth()  - 1;
77 
78         while (!pi.end())
79         {
80             p = pi.getNext();
81             const Real      life_time       = p->mTotalTimeToLive;
82             Real            particle_time   = 1.0f - (p->mTimeToLive / life_time);
83 
84             if (particle_time > 1.0f)
85                 particle_time = 1.0f;
86             if (particle_time < 0.0f)
87                 particle_time = 0.0f;
88 
89             const Real      float_index     = particle_time * width;
90             const int       index           = (int)float_index;
91 
92             if(index < 0)
93             {
94                 p->mColour = mColourImage.getColourAt(0, 0, 0);
95             }
96             else if(index >= width)
97             {
98                 p->mColour = mColourImage.getColourAt(width, 0, 0);
99             }
100             else
101             {
102                 // Linear interpolation
103                 const Real      fract       = float_index - (Real)index;
104                 const Real      to_colour   = fract;
105                 const Real      from_colour = 1.0f - to_colour;
106 
107                 ColourValue from=mColourImage.getColourAt(index, 0, 0),
108                             to=mColourImage.getColourAt(index+1, 0, 0);
109 
110                 p->mColour.r = from.r*from_colour + to.r*to_colour;
111                 p->mColour.g = from.g*from_colour + to.g*to_colour;
112                 p->mColour.b = from.b*from_colour + to.b*to_colour;
113                 p->mColour.a = from.a*from_colour + to.a*to_colour;
114             }
115         }
116     }
117 
118     //-----------------------------------------------------------------------
setImageAdjust(String name)119     void ColourImageAffector::setImageAdjust(String name)
120     {
121         mColourImageName = name;
122         mColourImageLoaded = false;
123     }
124     //-----------------------------------------------------------------------
_loadImage(void)125     void ColourImageAffector::_loadImage(void)
126     {
127         mColourImage.load(mColourImageName, mParent->getResourceGroupName());
128 
129         PixelFormat format = mColourImage.getFormat();
130 
131         if ( !PixelUtil::isAccessible(format) )
132         {
133             OGRE_EXCEPT( Exception::ERR_INVALIDPARAMS, "Error: Image is not accessible (rgba) image.",
134                     "ColourImageAffector::_loadImage" );
135         }
136 
137         mColourImageLoaded = true;
138     }
139     //-----------------------------------------------------------------------
getImageAdjust(void) const140     String ColourImageAffector::getImageAdjust(void) const
141     {
142         return mColourImageName;
143     }
144 
145 
146     //-----------------------------------------------------------------------
147     //-----------------------------------------------------------------------
148     //-----------------------------------------------------------------------
149     // Command objects
150     //-----------------------------------------------------------------------
151     //-----------------------------------------------------------------------
doGet(const void * target) const152     String ColourImageAffector::CmdImageAdjust::doGet(const void* target) const
153     {
154         return static_cast<const ColourImageAffector*>(target)->getImageAdjust();
155     }
doSet(void * target,const String & val)156     void ColourImageAffector::CmdImageAdjust::doSet(void* target, const String& val)
157     {
158         static_cast<ColourImageAffector*>(target)->setImageAdjust(val);
159     }
160 
161 }
162 
163 
164 
165