workspace/kwin/effects/explosioneffect.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *********************************************************************/
  20
  21 #include "explosioneffect.h"
  22
  23 #include <kwinglutils.h>
  24
  25
  26 #include <KStandardDirs>
  27 #include <kdebug.h>
  28
  29 #include <math.h>
  30
  31
  32 namespace KWin
  33 {
  34
  35 KWIN_EFFECT( explosion, ExplosionEffect )
  36 KWIN_EFFECT_SUPPORTED( explosion, ExplosionEffect::supported() )
  37
  38 ExplosionEffect::ExplosionEffect() : Effect()
  39     {
  40     mShader = 0;
  41     mStartOffsetTex = 0;
  42     mEndOffsetTex = 0;
  43
  44     mActiveAnimations = 0;
  45     mValid = true;
  46     mInited = false;
  47     }
  48
  49 ExplosionEffect::~ExplosionEffect()
  50     {
  51     delete mShader;
  52     delete mStartOffsetTex;
  53     delete mEndOffsetTex;
  54     }
  55
  56 bool ExplosionEffect::supported()
  57     {
  58     return GLShader::fragmentShaderSupported() &&
  59             (effects->compositingType() == OpenGLCompositing);
  60     }
  61
  62 bool ExplosionEffect::loadData()
  63 {
  64     mInited = true;
  65     QString shadername("explosion");
  66     QString fragmentshader =  KGlobal::dirs()->findResource("data", "kwin/explosion.frag");
  67     QString vertexshader =  KGlobal::dirs()->findResource("data", "kwin/explosion.vert");
  68     QString starttexture =  KGlobal::dirs()->findResource("data", "kwin/explosion-start.png");
  69     QString endtexture =  KGlobal::dirs()->findResource("data", "kwin/explosion-end.png");
  70     if(fragmentshader.isEmpty() || vertexshader.isEmpty())
  71     {
  72         kError() << "Couldn't locate shader files" << endl;
  73         return false;
  74     }
  75     if(starttexture.isEmpty() || endtexture.isEmpty())
  76     {
  77         kError() << "Couldn't locate texture files" << endl;
  78         return false;
  79     }
  80
  81     mShader = new GLShader(vertexshader, fragmentshader);
  82     if(!mShader->isValid())
  83     {
  84         kError() << "The shader failed to load!" << endl;
  85         return false;
  86     }
  87     else
  88     {
  89         mShader->bind();
  90         mShader->setUniform("winTexture", 0);
  91         mShader->setUniform("startOffsetTexture", 4);
  92         mShader->setUniform("endOffsetTexture", 5);
  93         mShader->unbind();
  94     }
  95
  96     mStartOffsetTex = new GLTexture(starttexture);
  97     mEndOffsetTex = new GLTexture(endtexture);
  98     if(mStartOffsetTex->isNull() || mEndOffsetTex->isNull())
  99     {
 100         kError() << "The textures failed to load!" << endl;
 101         return false;
 102     }
 103     else
 104     {
 105         mStartOffsetTex->setFilter( GL_LINEAR );
 106         mEndOffsetTex->setFilter( GL_LINEAR );
 107     }
 108
 109     return true;
 110     }
 111
 112 void ExplosionEffect::prePaintScreen( ScreenPrePaintData& data, int time )
 113     {
 114     if( mActiveAnimations > 0 )
 115         // We need to mark the screen as transformed. Otherwise the whole screen
 116         //  won't be repainted, resulting in artefacts
 117         data.mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
 118
 119     effects->prePaintScreen(data, time);
 120     }
 121
 122 void ExplosionEffect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int time )
 123     {
 124     if( mWindows.contains( w ))
 125         {
 126         if( mValid && !mInited )
 127             mValid = loadData();
 128         if( mValid )
 129             {
 130             mWindows[ w  ] += time / 700.0; // complete change in 700ms
 131             if( mWindows[ w  ] < 1 )
 132                 {
 133                 data.setTranslucent();
 134                 data.setTransformed();
 135                 w->enablePainting( EffectWindow::PAINT_DISABLED_BY_DELETE );
 136                 }
 137             else
 138                 {
 139                 mWindows.remove( w );
 140                 w->unrefWindow();
 141                 mActiveAnimations--;
 142                 }
 143             }
 144         }
 145
 146     effects->prePaintWindow( w, data, time );
 147     }
 148
 149 void ExplosionEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
 150     {
 151     // Make sure we have OpenGL compositing and the window is vidible and not a
 152     //  special window
 153     bool useshader = ( mValid && mWindows.contains( w ) );
 154     if( useshader )
 155         {
 156         double maxscaleadd = 1.5f;
 157         double scale = 1 + maxscaleadd*mWindows[w];
 158         data.xScale = scale;
 159         data.yScale = scale;
 160         data.xTranslate += int( w->width() / 2 * ( 1 - scale ));
 161         data.yTranslate += int( w->height() / 2 * ( 1 - scale ));
 162         data.opacity *= 0.99;  // Force blending
 163         mShader->bind();
 164         mShader->setUniform("factor", (float)mWindows[w]);
 165         mShader->setUniform("scale", (float)scale);
 166         glActiveTexture(GL_TEXTURE4);
 167         mStartOffsetTex->bind();
 168         glActiveTexture(GL_TEXTURE5);
 169         mEndOffsetTex->bind();
 170         glActiveTexture(GL_TEXTURE0);
 171         data.shader = mShader;
 172         }
 173
 174     // Call the next effect.
 175     effects->paintWindow( w, mask, region, data );
 176
 177     if( useshader )
 178         {
 179         mShader->unbind();
 180         glActiveTexture(GL_TEXTURE4);
 181         mStartOffsetTex->unbind();
 182         glActiveTexture(GL_TEXTURE5);
 183         mEndOffsetTex->unbind();
 184         glActiveTexture(GL_TEXTURE0);
 185         }
 186     }
 187
 188 void ExplosionEffect::postPaintScreen()
 189     {
 190     if( mActiveAnimations > 0 )
 191         effects->addRepaintFull();
 192
 193     // Call the next effect.
 194     effects->postPaintScreen();
 195     }
 196
 197 void ExplosionEffect::windowClosed( EffectWindow* c )
 198     {
 199     if( c->isOnCurrentDesktop() && !c->isMinimized())
 200         {
 201         mWindows[ c ] = 0; // count up to 1
 202         c->addRepaintFull();
 203         c->refWindow();
 204         mActiveAnimations++;
 205         }
 206     }
 207
 208 void ExplosionEffect::windowDeleted( EffectWindow* c )
 209     {
 210     mWindows.remove( c );
 211     }
 212
 213 } // namespace
 214