314 lines
10 KiB
C++
314 lines
10 KiB
C++
/********************************************************************
|
|
KWin - the KDE window manager
|
|
This file is part of the KDE project.
|
|
|
|
Copyright (C) 2010 by Fredrik Höglund <fredrik@kde.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*********************************************************************/
|
|
|
|
#include "lanczosfilter.h"
|
|
#include "effects.h"
|
|
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
#include <kwinglutils.h>
|
|
#endif
|
|
|
|
#include <kwineffects.h>
|
|
#include <KDE/KGlobalSettings>
|
|
|
|
#include <qmath.h>
|
|
#include <cmath>
|
|
|
|
namespace KWin
|
|
{
|
|
|
|
LanczosFilter::LanczosFilter( QObject* parent )
|
|
: QObject( parent )
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
, m_offscreenTex( 0 )
|
|
, m_offscreenTarget( 0 )
|
|
, m_shader( 0 )
|
|
#endif
|
|
, m_inited( false)
|
|
{
|
|
}
|
|
|
|
LanczosFilter::~LanczosFilter()
|
|
{
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
delete m_offscreenTarget;
|
|
delete m_offscreenTex;
|
|
delete m_shader;
|
|
#endif
|
|
}
|
|
|
|
void LanczosFilter::init()
|
|
{
|
|
if (m_inited)
|
|
return;
|
|
m_inited = true;
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
// check the blacklist
|
|
KSharedConfigPtr config = KSharedConfig::openConfig( "kwinrc" );
|
|
KConfigGroup blacklist = config->group( "Blacklist" ).group( "Lanczos" );
|
|
if( effects->checkDriverBlacklist( blacklist ) )
|
|
{
|
|
kDebug() << "Lanczos Filter disabled by driver blacklist";
|
|
return;
|
|
}
|
|
|
|
if ( GLShader::fragmentShaderSupported() &&
|
|
GLShader::vertexShaderSupported() &&
|
|
GLRenderTarget::supported() )
|
|
{
|
|
m_shader = new GLShader(":/resources/lanczos-vertex.glsl", ":/resources/lanczos-fragment.glsl");
|
|
if (m_shader->isValid())
|
|
{
|
|
m_shader->bind();
|
|
m_uTexUnit = m_shader->uniformLocation("texUnit");
|
|
m_uKernelSize = m_shader->uniformLocation("kernelSize");
|
|
m_uKernel = m_shader->uniformLocation("kernel");
|
|
m_uOffsets = m_shader->uniformLocation("offsets");
|
|
m_shader->unbind();
|
|
}
|
|
else
|
|
{
|
|
kDebug(1212) << "Shader is not valid";
|
|
m_shader = 0;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
void LanczosFilter::updateOffscreenSurfaces()
|
|
{
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
int w = displayWidth();
|
|
int h = displayHeight();
|
|
if ( !GLTexture::NPOTTextureSupported() )
|
|
{
|
|
w = nearestPowerOfTwo( w );
|
|
h = nearestPowerOfTwo( h );
|
|
}
|
|
if ( !m_offscreenTex || m_offscreenTex->width() != w || m_offscreenTex->height() != h )
|
|
{
|
|
if ( m_offscreenTex )
|
|
{
|
|
delete m_offscreenTex;
|
|
delete m_offscreenTarget;
|
|
}
|
|
m_offscreenTex = new GLTexture( w, h );
|
|
m_offscreenTex->setFilter( GL_LINEAR );
|
|
m_offscreenTex->setWrapMode( GL_CLAMP_TO_EDGE );
|
|
m_offscreenTarget = new GLRenderTarget( m_offscreenTex );
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static float sinc( float x )
|
|
{
|
|
return std::sin( x * M_PI ) / ( x * M_PI );
|
|
}
|
|
|
|
static float lanczos( float x, float a )
|
|
{
|
|
if ( qFuzzyCompare( x + 1.0, 1.0 ) )
|
|
return 1.0;
|
|
|
|
if ( qAbs( x ) >= a )
|
|
return 0.0;
|
|
|
|
return sinc( x ) * sinc( x / a );
|
|
}
|
|
|
|
QVector<QVector4D> LanczosFilter::createKernel( float delta )
|
|
{
|
|
const float a = 2.0;
|
|
|
|
// The two outermost samples always fall at points where the lanczos
|
|
// function returns 0, so we'll skip them.
|
|
const int sampleCount = qBound( 3, qCeil(delta * a) * 2 + 1 - 2, 49 );
|
|
const int center = sampleCount / 2;
|
|
const int kernelSize = center + 1;
|
|
const float factor = 1.0 / delta;
|
|
|
|
QVector<float> values( kernelSize );
|
|
QVector<QVector4D> kernel( kernelSize );
|
|
float sum = 0;
|
|
|
|
for ( int i = 0; i < kernelSize; i++ ) {
|
|
const float val = lanczos( i * factor, a );
|
|
sum += i > 0 ? val * 2 : val;
|
|
values[i] = val;
|
|
}
|
|
|
|
// Normalize the kernel
|
|
for ( int i = 0; i < kernelSize; i++ ) {
|
|
const float val = values[i] / sum;
|
|
kernel[i] = QVector4D( val, val, val, val );
|
|
}
|
|
|
|
return kernel;
|
|
}
|
|
|
|
QVector<QVector2D> LanczosFilter::createOffsets( int count, float width, Qt::Orientation direction )
|
|
{
|
|
QVector<QVector2D> offsets( count );
|
|
for ( int i = 0; i < count; i++ ) {
|
|
offsets[i] = ( direction == Qt::Horizontal ) ?
|
|
QVector2D( i / width, 0 ) : QVector2D( 0, i / width );
|
|
}
|
|
return offsets;
|
|
}
|
|
|
|
void LanczosFilter::performPaint( EffectWindowImpl* w, int mask, QRegion region, WindowPaintData& data )
|
|
{
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
if( effects->compositingType() == KWin::OpenGLCompositing &&
|
|
KGlobalSettings::graphicEffectsLevel() & KGlobalSettings::SimpleAnimationEffects )
|
|
{
|
|
if (!m_inited)
|
|
init();
|
|
if ( m_shader )
|
|
{
|
|
double left = 0;
|
|
double top = 0;
|
|
double right = w->width();
|
|
double bottom = w->height();
|
|
foreach( const WindowQuad& quad, data.quads )
|
|
{
|
|
// we need this loop to include the decoration padding
|
|
left = qMin(left, quad.left());
|
|
top = qMin(top, quad.top());
|
|
right = qMax(right, quad.right());
|
|
bottom = qMax(bottom, quad.bottom());
|
|
}
|
|
double width = right - left;
|
|
double height = bottom - top;
|
|
int tx = data.xTranslate + w->x() + left*data.xScale;
|
|
int ty = data.yTranslate + w->y() + top*data.yScale;
|
|
int tw = width*data.xScale;
|
|
int th = height*data.yScale;
|
|
|
|
int sw = width;
|
|
int sh = height;
|
|
|
|
WindowPaintData thumbData = data;
|
|
thumbData.xScale = 1.0;
|
|
thumbData.yScale = 1.0;
|
|
thumbData.xTranslate = -w->x() - left;
|
|
thumbData.yTranslate = -w->y() - top;
|
|
|
|
// Bind the offscreen FBO and draw the window on it unscaled
|
|
updateOffscreenSurfaces();
|
|
effects->pushRenderTarget( m_offscreenTarget );
|
|
|
|
glClear( GL_COLOR_BUFFER_BIT );
|
|
w->sceneWindow()->performPaint( mask, QRegion(0, 0, sw, sh), thumbData );
|
|
|
|
// Create a scratch texture and copy the rendered window into it
|
|
GLTexture tex( sw, sh );
|
|
tex.setFilter( GL_LINEAR );
|
|
tex.setWrapMode( GL_CLAMP_TO_EDGE );
|
|
tex.bind();
|
|
|
|
glCopyTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0, 0, m_offscreenTex->height() - sh, sw, sh );
|
|
|
|
// Set up the shader for horizontal scaling
|
|
float dx = sw / float(tw);
|
|
QVector<QVector4D> kernel = createKernel( dx );
|
|
QVector<QVector2D> offsets = createOffsets( kernel.size(), sw, Qt::Horizontal );
|
|
|
|
m_shader->bind();
|
|
glUniform1i( m_uTexUnit, 0 );
|
|
glUniform1i( m_uKernelSize, kernel.size() );
|
|
glUniform2fv( m_uOffsets, offsets.size(), (const GLfloat*)offsets.constData() );
|
|
glUniform4fv( m_uKernel, kernel.size(), (const GLfloat*)kernel.constData() );
|
|
|
|
// Draw the window back into the FBO, this time scaled horizontally
|
|
glClear( GL_COLOR_BUFFER_BIT );
|
|
|
|
glBegin( GL_QUADS );
|
|
glTexCoord2f( 0, 0 ); glVertex2i( 0, 0 ); // Top left
|
|
glTexCoord2f( 1, 0 ); glVertex2i( tw, 0 ); // Top right
|
|
glTexCoord2f( 1, 1 ); glVertex2i( tw, sh ); // Bottom right
|
|
glTexCoord2f( 0, 1 ); glVertex2i( 0, sh ); // Bottom left
|
|
glEnd();
|
|
|
|
// At this point we don't need the scratch texture anymore
|
|
tex.unbind();
|
|
tex.discard();
|
|
|
|
// Unbind the FBO
|
|
effects->popRenderTarget();
|
|
|
|
// Set up the shader for vertical scaling
|
|
float dy = sh / float(th);
|
|
kernel = createKernel( dy );
|
|
offsets = createOffsets( kernel.size(), m_offscreenTex->height(), Qt::Vertical );
|
|
|
|
glUniform1i( m_uKernelSize, kernel.size() );
|
|
glUniform2fv( m_uOffsets, offsets.size(), (const GLfloat*)offsets.constData() );
|
|
glUniform4fv( m_uKernel, kernel.size(), (const GLfloat*)kernel.constData() );
|
|
|
|
float sx2 = tw / float(m_offscreenTex->width());
|
|
float sy2 = 1 - (sh / float(m_offscreenTex->height()));
|
|
|
|
// Now draw the horizontally scaled window in the FBO at the right
|
|
// coordinates on the screen, while scaling it vertically and blending it.
|
|
m_offscreenTex->bind();
|
|
|
|
glPushAttrib( GL_COLOR_BUFFER_BIT );
|
|
glEnable( GL_BLEND );
|
|
glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA );
|
|
|
|
glBegin( GL_QUADS );
|
|
glTexCoord2f( 0, sy2 ); glVertex2i( tx, ty ); // Top left
|
|
glTexCoord2f( sx2, sy2 ); glVertex2i( tx + tw, ty ); // Top right
|
|
glTexCoord2f( sx2, 1 ); glVertex2i( tx + tw, ty + th ); // Bottom right
|
|
glTexCoord2f( 0, 1 ); glVertex2i( tx, ty + th ); // Bottom left
|
|
glEnd();
|
|
|
|
glPopAttrib();
|
|
m_offscreenTex->unbind();
|
|
m_shader->unbind();
|
|
|
|
// Delete the offscreen surface after 5 seconds
|
|
m_timer.start( 5000, this );
|
|
return;
|
|
}
|
|
} // if ( effects->compositingType() == KWin::OpenGLCompositing )
|
|
#endif
|
|
w->sceneWindow()->performPaint( mask, region, data );
|
|
} // End of function
|
|
|
|
void LanczosFilter::timerEvent( QTimerEvent *event )
|
|
{
|
|
#ifdef KWIN_HAVE_OPENGL_COMPOSITING
|
|
if (event->timerId() == m_timer.timerId())
|
|
{
|
|
m_timer.stop();
|
|
|
|
delete m_offscreenTarget;
|
|
delete m_offscreenTex;
|
|
m_offscreenTarget = 0;
|
|
m_offscreenTex = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
} // namespace
|
|
|