148 lines
4 KiB
C++
148 lines
4 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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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#include "demo_liquid.h"
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#include <kwinglutils.h>
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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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mTexture = 0;
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mRenderTarget = 0;
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mShader = 0;
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mTime = 0.0f;
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mValid = loadData();
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}
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LiquidEffect::~LiquidEffect()
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{
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delete mTexture;
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delete mRenderTarget;
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delete mShader;
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}
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bool LiquidEffect::loadData()
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{
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// If NPOT textures are not supported, use nearest power-of-two sized
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// texture. It wastes memory, but it's possible to support systems without
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// NPOT textures that way
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int texw = displayWidth();
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int texh = displayHeight();
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if (!GLTexture::NPOTTextureSupported()) {
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kWarning(1212) << "NPOT textures not supported, wasting some memory" ;
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texw = nearestPowerOfTwo(texw);
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texh = nearestPowerOfTwo(texh);
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}
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// Create texture and render target
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mTexture = new GLTexture(texw, texh);
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mTexture->setFilter(GL_LINEAR_MIPMAP_LINEAR);
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mTexture->setWrapMode(GL_CLAMP);
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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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kError(1212) << "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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kError(1212) << "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("textureWidth", (float)texw);
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mShader->setUniform("textureHeight", (float)texh);
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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 GLRenderTarget::supported() &&
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GLShader::fragmentShaderSupported() &&
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(effects->compositingType() == OpenGLCompositing);
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}
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void LiquidEffect::prePaintScreen(ScreenPrePaintData& data, int time)
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{
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mTime += time / 1000.0f;
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if (mValid) {
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data.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(data, 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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// 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", (float)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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