workspace/kwin/effects/test/test_fbo.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 "test_fbo.h"
  22
  23 #include <kwinglutils.h>
  24
  25 #include <assert.h>
  26
  27 namespace KWin
  28 {
  29
  30 KWIN_EFFECT( test_fbo, TestFBOEffect )
  31 KWIN_EFFECT_SUPPORTED( test_fbo, TestFBOEffect::supported() )
  32
  33
  34 TestFBOEffect::TestFBOEffect() : Effect()
  35     {
  36     mRot = 0.0f;
  37
  38     // Create texture and render target
  39     mTexture = new GLTexture(displayWidth(), displayHeight());
  40     mTexture->setFilter(GL_LINEAR_MIPMAP_LINEAR);
  41
  42     mRenderTarget = new GLRenderTarget(mTexture);
  43
  44     mValid = mRenderTarget->valid();
  45     }
  46
  47 TestFBOEffect::~TestFBOEffect()
  48     {
  49     delete mTexture;
  50     delete mRenderTarget;
  51     }
  52
  53 bool TestFBOEffect::supported()
  54     {
  55     return GLRenderTarget::supported() && GLTexture::NPOTTextureSupported() &&
  56             (effects->compositingType() == OpenGLCompositing);
  57     }
  58
  59
  60 void TestFBOEffect::prePaintScreen( ScreenPrePaintData& data, int time )
  61     {
  62     if(mValid)
  63         {
  64         data.mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
  65         // Start rendering to texture
  66         effects->pushRenderTarget(mRenderTarget);
  67         }
  68
  69     effects->prePaintScreen(data, time);
  70     }
  71
  72 void TestFBOEffect::postPaintScreen()
  73     {
  74     // Call the next effect.
  75     effects->postPaintScreen();
  76
  77     if(mValid)
  78         {
  79         // Disable render texture
  80         assert( effects->popRenderTarget() == mRenderTarget );
  81         mTexture->bind();
  82
  83         // Render fullscreen quad with screen contents
  84         glBegin(GL_QUADS);
  85             glTexCoord2f(0.0, 0.0); glVertex2f(0.0, displayHeight());
  86             glTexCoord2f(1.0, 0.0); glVertex2f(displayWidth(), displayHeight());
  87             glTexCoord2f(1.0, 1.0); glVertex2f(displayWidth(), 0.0);
  88             glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 0.0);
  89         glEnd();
  90
  91         // Render rotated screen thumbnail
  92         mRot += 0.5f;
  93         glTranslatef(displayWidth()/2.0f, displayHeight()/2.0f, 0.0f);
  94         glRotatef(mRot, 0.0, 0.0, 1.0);
  95         glScalef(0.2, 0.2, 0.2);
  96         glTranslatef(-displayWidth()/2.0f, -displayHeight()/2.0f, 0.0f);
  97
  98         glEnable(GL_BLEND);
  99         glColor4f(1.0, 1.0, 1.0, 0.8);
 100         glBegin(GL_QUADS);
 101             glTexCoord2f(0.0, 0.0); glVertex2f(0.0, displayHeight());
 102             glTexCoord2f(1.0, 0.0); glVertex2f(displayWidth(), displayHeight());
 103             glTexCoord2f(1.0, 1.0); glVertex2f(displayWidth(), 0.0);
 104             glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 0.0);
 105         glEnd();
 106         glColor4f(1.0, 1.0, 1.0, 1.0);
 107         glDisable(GL_BLEND);
 108
 109         // Reset matrix and unbind texture
 110         glLoadIdentity();
 111
 112         mTexture->unbind();
 113
 114         // Make sure the animation continues
 115         effects->addRepaintFull();
 116         }
 117
 118     }
 119
 120
 121 } // namespace
 122