283 lines
9.1 KiB
C++
283 lines
9.1 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) 2010 by Fredrik Höglund <fredrik@kde.org>
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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 "lanczosfilter.h"
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#include "effects.h"
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#ifdef KWIN_HAVE_OPENGL_COMPOSITING
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#include <kwinglutils.h>
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#endif
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#include <kwineffects.h>
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#include <KDE/KGlobalSettings>
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#include <qmath.h>
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#include <cmath>
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namespace KWin
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{
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LanczosFilter::LanczosFilter( QObject* parent )
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: QObject( parent )
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, m_offscreenTex( 0 )
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, m_offscreenTarget( 0 )
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, m_shader( 0 )
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, m_inited( false)
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{
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}
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LanczosFilter::~LanczosFilter()
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{
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delete m_offscreenTarget;
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delete m_offscreenTex;
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delete m_shader;
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}
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void LanczosFilter::init()
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{
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if (m_inited)
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return;
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m_inited = true;
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#ifdef KWIN_HAVE_OPENGL_COMPOSITING
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if ( GLShader::fragmentShaderSupported() &&
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GLShader::vertexShaderSupported() &&
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GLRenderTarget::supported() )
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{
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m_shader = new GLShader(":/resources/lanczos-vertex.glsl", ":/resources/lanczos-fragment.glsl");
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if (m_shader->isValid())
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{
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m_shader->bind();
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m_uTexUnit = m_shader->uniformLocation("texUnit");
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m_uKernelSize = m_shader->uniformLocation("kernelSize");
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m_uKernel = m_shader->uniformLocation("kernel");
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m_uOffsets = m_shader->uniformLocation("offsets");
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m_shader->unbind();
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}
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else
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{
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kDebug(1212) << "Shader is not valid";
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m_shader = 0;
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}
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}
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#endif
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}
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void LanczosFilter::updateOffscreenSurfaces()
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{
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int w = displayWidth();
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int h = displayHeight();
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if ( !GLTexture::NPOTTextureSupported() )
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{
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w = nearestPowerOfTwo( w );
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h = nearestPowerOfTwo( h );
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}
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if ( !m_offscreenTex || m_offscreenTex->width() != w || m_offscreenTex->height() != h )
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{
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if ( m_offscreenTex )
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{
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delete m_offscreenTex;
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delete m_offscreenTarget;
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}
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m_offscreenTex = new GLTexture( w, h );
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m_offscreenTex->setFilter( GL_LINEAR );
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m_offscreenTex->setWrapMode( GL_CLAMP_TO_EDGE );
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m_offscreenTarget = new GLRenderTarget( m_offscreenTex );
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}
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}
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static float sinc( float x )
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{
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return std::sin( x * M_PI ) / ( x * M_PI );
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}
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static float lanczos( float x, float a )
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{
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if ( qFuzzyCompare( x + 1.0, 1.0 ) )
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return 1.0;
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if ( qAbs( x ) >= a )
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return 0.0;
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return sinc( x ) * sinc( x / a );
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}
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QVector<QVector4D> LanczosFilter::createKernel( float delta )
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{
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const float a = 2.0;
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// The two outermost samples always fall at points where the lanczos
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// function returns 0, so we'll skip them.
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const int sampleCount = qBound( 3, qCeil(delta * a) * 2 + 1 - 2, 49 );
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const int center = sampleCount / 2;
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const int kernelSize = center + 1;
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const float factor = 1.0 / delta;
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QVector<float> values( kernelSize );
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QVector<QVector4D> kernel( kernelSize );
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float sum = 0;
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for ( int i = 0; i < kernelSize; i++ ) {
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const float val = lanczos( i * factor, a );
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sum += i > 0 ? val * 2 : val;
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values[i] = val;
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}
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// Normalize the kernel
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for ( int i = 0; i < kernelSize; i++ ) {
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const float val = values[i] / sum;
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kernel[i] = QVector4D( val, val, val, val );
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}
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return kernel;
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}
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QVector<QVector2D> LanczosFilter::createOffsets( int count, float width, Qt::Orientation direction )
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{
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QVector<QVector2D> offsets( count );
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for ( int i = 0; i < count; i++ ) {
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offsets[i] = ( direction == Qt::Horizontal ) ?
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QVector2D( i / width, 0 ) : QVector2D( 0, i / width );
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}
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return offsets;
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}
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void LanczosFilter::performPaint( EffectWindowImpl* w, int mask, QRegion region, WindowPaintData& data )
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{
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#ifdef KWIN_HAVE_OPENGL_COMPOSITING
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if( effects->compositingType() == KWin::OpenGLCompositing &&
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KGlobalSettings::graphicEffectsLevel() & KGlobalSettings::SimpleAnimationEffects )
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{
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if (!m_inited)
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init();
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if ( m_shader )
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{
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int tx = data.xTranslate + w->x();
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int ty = data.yTranslate + w->y();
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int tw = w->width()*data.xScale;
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int th = w->height()*data.yScale;
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int sw = w->width();
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int sh = w->height();
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WindowPaintData thumbData = data;
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thumbData.xScale = 1.0;
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thumbData.yScale = 1.0;
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thumbData.xTranslate = -w->x();
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thumbData.yTranslate = -w->y();
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// Bind the offscreen FBO and draw the window on it unscaled
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updateOffscreenSurfaces();
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effects->pushRenderTarget( m_offscreenTarget );
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glClear( GL_COLOR_BUFFER_BIT );
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w->sceneWindow()->performPaint( mask, QRegion(0, 0, sw, sh), thumbData );
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// Create a scratch texture and copy the rendered window into it
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GLTexture tex( sw, sh );
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tex.setFilter( GL_LINEAR );
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tex.setWrapMode( GL_CLAMP_TO_EDGE );
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tex.bind();
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glCopyTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0, 0, m_offscreenTex->height() - sh, sw, sh );
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// Set up the shader for horizontal scaling
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float dx = sw / float(tw);
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QVector<QVector4D> kernel = createKernel( dx );
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QVector<QVector2D> offsets = createOffsets( kernel.size(), sw, Qt::Horizontal );
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m_shader->bind();
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glUniform1i( m_uTexUnit, 0 );
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glUniform1i( m_uKernelSize, kernel.size() );
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glUniform2fv( m_uOffsets, offsets.size(), (const GLfloat*)offsets.constData() );
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glUniform4fv( m_uKernel, kernel.size(), (const GLfloat*)kernel.constData() );
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// Draw the window back into the FBO, this time scaled horizontally
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glClear( GL_COLOR_BUFFER_BIT );
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glBegin( GL_QUADS );
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glTexCoord2f( 0, 0 ); glVertex2i( 0, 0 ); // Top left
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glTexCoord2f( 1, 0 ); glVertex2i( tw, 0 ); // Top right
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glTexCoord2f( 1, 1 ); glVertex2i( tw, sh ); // Bottom right
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glTexCoord2f( 0, 1 ); glVertex2i( 0, sh ); // Bottom left
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glEnd();
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// At this point we don't need the scratch texture anymore
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tex.unbind();
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tex.discard();
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// Unbind the FBO
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effects->popRenderTarget();
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// Set up the shader for vertical scaling
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float dy = sh / float(th);
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kernel = createKernel( dy );
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offsets = createOffsets( kernel.size(), m_offscreenTex->height(), Qt::Vertical );
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glUniform1i( m_uKernelSize, kernel.size() );
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glUniform2fv( m_uOffsets, offsets.size(), (const GLfloat*)offsets.constData() );
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glUniform4fv( m_uKernel, kernel.size(), (const GLfloat*)kernel.constData() );
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float sx2 = tw / float(m_offscreenTex->width());
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float sy2 = 1 - (sh / float(m_offscreenTex->height()));
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// Now draw the horizontally scaled window in the FBO at the right
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// coordinates on the screen, while scaling it vertically and blending it.
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m_offscreenTex->bind();
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glPushAttrib( GL_COLOR_BUFFER_BIT );
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glEnable( GL_BLEND );
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glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA );
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glBegin( GL_QUADS );
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glTexCoord2f( 0, sy2 ); glVertex2i( tx, ty ); // Top left
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glTexCoord2f( sx2, sy2 ); glVertex2i( tx + tw, ty ); // Top right
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glTexCoord2f( sx2, 1 ); glVertex2i( tx + tw, ty + th ); // Bottom right
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glTexCoord2f( 0, 1 ); glVertex2i( tx, ty + th ); // Bottom left
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glEnd();
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glPopAttrib();
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m_offscreenTex->unbind();
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m_shader->unbind();
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// Delete the offscreen surface after 5 seconds
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m_timer.start( 5000, this );
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return;
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}
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} // if ( effects->compositingType() == KWin::OpenGLCompositing )
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#endif
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w->sceneWindow()->performPaint( mask, region, data );
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} // End of function
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void LanczosFilter::timerEvent( QTimerEvent *event )
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{
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if (event->timerId() == m_timer.timerId())
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{
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m_timer.stop();
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delete m_offscreenTarget;
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delete m_offscreenTex;
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m_offscreenTarget = 0;
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m_offscreenTex = 0;
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}
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}
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} // namespace
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