123 lines
3.1 KiB
C++
123 lines
3.1 KiB
C++
/*****************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
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You can Freely distribute this program under the GNU General Public
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License. See the file "COPYING" for the exact licensing terms.
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******************************************************************/
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#include "demo_liquid.h"
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#include <kwinglutils.h>
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#include <QString>
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#include <KStandardDirs>
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#include <kdebug.h>
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#include <assert.h>
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namespace KWin
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{
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KWIN_EFFECT( Demo_Liquid, LiquidEffect );
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KWIN_EFFECT_SUPPORTED( Demo_Liquid, LiquidEffect::supported() );
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LiquidEffect::LiquidEffect() : Effect()
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{
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mTime = 0.0f;
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mValid = loadData();
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}
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bool LiquidEffect::loadData()
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{
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// Create texture and render target
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mTexture = new GLTexture(displayWidth(), displayHeight());
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mTexture->setFilter(GL_LINEAR_MIPMAP_LINEAR);
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mRenderTarget = new GLRenderTarget(mTexture);
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if( !mRenderTarget->valid() )
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return false;
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QString fragmentshader = KGlobal::dirs()->findResource("data", "kwin/liquid.frag");
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QString vertexshader = KGlobal::dirs()->findResource("data", "kwin/liquid.vert");
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if(fragmentshader.isEmpty() || vertexshader.isEmpty())
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{
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kError() << k_funcinfo << "Couldn't locate shader files" << endl;
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return false;
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}
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mShader = new GLShader(vertexshader, fragmentshader);
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if(!mShader->isValid())
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{
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kError() << k_funcinfo << "The shader failed to load!" << endl;
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return false;
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}
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mShader->bind();
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mShader->setUniform("sceneTex", 0);
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mShader->setUniform("displayWidth", (float)displayWidth());
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mShader->setUniform("displayHeight", (float)displayHeight());
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mShader->unbind();
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return true;
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}
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bool LiquidEffect::supported()
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{
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return hasGLExtension("GL_EXT_framebuffer_object") &&
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GLShader::fragmentShaderSupported() &&
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(effects->compositingType() == OpenGLCompositing);
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}
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void LiquidEffect::prePaintScreen( int* mask, QRegion* region, int time )
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{
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mTime += time / 1000.0f;
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if(mValid)
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{
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*mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
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// Start rendering to texture
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effects->pushRenderTarget(mRenderTarget);
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}
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effects->prePaintScreen(mask, region, time);
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}
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void LiquidEffect::postPaintScreen()
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{
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// Call the next effect.
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effects->postPaintScreen();
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if(mValid)
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{
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// Disable render texture
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assert( effects->popRenderTarget() == mRenderTarget );
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mTexture->bind();
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// Use the shader
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mShader->bind();
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mShader->setUniform("time", mTime);
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// Render fullscreen quad with screen contents
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glBegin(GL_QUADS);
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glVertex2f(0.0, displayHeight());
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glVertex2f(displayWidth(), displayHeight());
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glVertex2f(displayWidth(), 0.0);
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glVertex2f(0.0, 0.0);
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glEnd();
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mShader->unbind();
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mTexture->unbind();
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// Make sure the animation continues
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effects->addRepaintFull();
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}
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}
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} // namespace
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