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kwin/effects/lookingglass/lookingglass.cpp
Martin Gräßlin 6cd6883d8c Remove too strong error checks. 
That should never have been committed, it was just for finding an error.
2011-01-30 14:12:05 +01:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
Copyright (C) 2007 Christian Nitschkowski <christian.nitschkowski@kdemail.net>
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 "lookingglass.h"
#include <kwinglutils.h>
#include <kactioncollection.h>
#include <kaction.h>
#include <kconfiggroup.h>
#include <klocale.h>
#include <kdebug.h>
#include <KDE/KGlobal>
#include <KDE/KStandardDirs>
#include <QVector2D>
#include <kmessagebox.h>
namespace KWin
{
KWIN_EFFECT( lookingglass, LookingGlassEffect )
KWIN_EFFECT_SUPPORTED( lookingglass, LookingGlassEffect::supported() )
LookingGlassEffect::LookingGlassEffect()
: QObject()
, zoom( 1.0f )
, target_zoom( 1.0f )
, polling( false )
, m_texture( NULL )
, m_fbo( NULL )
, m_vbo( NULL )
, m_shader( NULL )
, m_enabled( false )
, m_valid( false )
{
actionCollection = new KActionCollection( this );
actionCollection->setConfigGlobal(true);
actionCollection->setConfigGroup("LookingGlass");
KAction* a;
a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomIn, this, SLOT( zoomIn())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Plus));
a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ZoomOut, this, SLOT( zoomOut())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Minus));
a = static_cast< KAction* >( actionCollection->addAction( KStandardAction::ActualSize, this, SLOT( toggle())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_0));
reconfigure( ReconfigureAll );
}
LookingGlassEffect::~LookingGlassEffect()
{
delete m_texture;
delete m_fbo;
delete m_shader;
delete m_vbo;
}
bool LookingGlassEffect::supported()
{
return GLRenderTarget::supported() &&
GLShader::fragmentShaderSupported() &&
(effects->compositingType() == OpenGLCompositing);
}
void LookingGlassEffect::reconfigure( ReconfigureFlags )
{
KConfigGroup conf = EffectsHandler::effectConfig("LookingGlass");
initialradius = conf.readEntry("Radius", 200);
radius = initialradius;
kDebug(1212) << QString("Radius from config: %1").arg(radius) << endl;
actionCollection->readSettings();
m_valid = loadData();
}
bool LookingGlassEffect::loadData()
{
// If NPOT textures are not supported, use nearest power-of-two sized
// texture. It wastes memory, but it's possible to support systems without
// NPOT textures that way
int texw = displayWidth();
int texh = displayHeight();
if (!GLTexture::NPOTTextureSupported()) {
kWarning( 1212 ) << "NPOT textures not supported, wasting some memory" ;
texw = nearestPowerOfTwo(texw);
texh = nearestPowerOfTwo(texh);
}
// Create texture and render target
m_texture = new GLTexture(texw, texh);
m_texture->setFilter(GL_LINEAR_MIPMAP_LINEAR);
m_texture->setWrapMode(GL_CLAMP_TO_EDGE);
m_fbo = new GLRenderTarget(m_texture);
if (!m_fbo->valid()) {
return false;
}
const QString fragmentshader = KGlobal::dirs()->findResource("data", "kwin/lookingglass.frag");
m_shader = ShaderManager::instance()->loadFragmentShader(ShaderManager::SimpleShader, fragmentshader);
if (m_shader->isValid()) {
ShaderManager::instance()->pushShader(m_shader);
m_shader->setUniform("u_textureSize", QVector2D(displayWidth(), displayHeight()));
ShaderManager::instance()->popShader();
} else {
kError(1212) << "The shader failed to load!" << endl;
return false;
}
m_vbo = new GLVertexBuffer(GLVertexBuffer::Static);
QVector<float> verts;
QVector<float> texcoords;
texcoords << displayWidth() << 0.0;
verts << displayWidth() << 0.0;
texcoords << 0.0 << 0.0;
verts << 0.0 << 0.0;
texcoords << 0.0 << displayHeight();
verts << 0.0 << displayHeight();
texcoords << 0.0 << displayHeight();
verts << 0.0 << displayHeight();
texcoords << displayWidth() << displayHeight();
verts << displayWidth() << displayHeight();
texcoords << displayWidth() << 0.0;
verts << displayWidth() << 0.0;
m_vbo->setData(6, 2, verts.constData(), texcoords.constData());
return true;
}
void LookingGlassEffect::toggle()
{
if( target_zoom == 1.0f )
{
target_zoom = 2.0f;
if( !polling )
{
polling = true;
effects->startMousePolling();
}
m_enabled = true;
}
else
{
target_zoom = 1.0f;
if( polling )
{
polling = false;
effects->stopMousePolling();
}
m_enabled = false;
}
}
void LookingGlassEffect::zoomIn()
{
target_zoom = qMin(7.0, target_zoom + 0.5);
m_enabled = true;
if( !polling )
{
polling = true;
effects->startMousePolling();
}
effects->addRepaint( cursorPos().x() - radius, cursorPos().y() - radius, 2*radius, 2*radius );
}
void LookingGlassEffect::zoomOut()
{
target_zoom -= 0.5;
if( target_zoom < 1 )
{
target_zoom = 1;
m_enabled = false;
if( polling )
{
polling = false;
effects->stopMousePolling();
}
}
effects->addRepaint( cursorPos().x() - radius, cursorPos().y() - radius, 2*radius, 2*radius );
}
void LookingGlassEffect::prePaintScreen( ScreenPrePaintData& data, int time )
{
if( zoom != target_zoom )
{
double diff = time / animationTime( 500.0 );
if( target_zoom > zoom )
zoom = qMin( zoom * qMax( 1.0 + diff, 1.2 ), target_zoom );
else
zoom = qMax( zoom * qMin( 1.0 - diff, 0.8 ), target_zoom );
kDebug(1212) << "zoom is now " << zoom;
radius = qBound((double)initialradius, initialradius * zoom, 3.5*initialradius);
if( zoom <= 1.0f ) {
m_enabled = false;
}
effects->addRepaint( cursorPos().x() - radius, cursorPos().y() - radius, 2*radius, 2*radius );
}
if (m_valid && m_enabled) {
data.mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
// Start rendering to texture
effects->pushRenderTarget(m_fbo);
}
effects->prePaintScreen( data, time );
}
void LookingGlassEffect::mouseChanged( const QPoint& pos, const QPoint& old, Qt::MouseButtons,
Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers )
{
if( pos != old && m_enabled )
{
effects->addRepaint( pos.x() - radius, pos.y() - radius, 2*radius, 2*radius );
effects->addRepaint( old.x() - radius, old.y() - radius, 2*radius, 2*radius );
}
}
void LookingGlassEffect::postPaintScreen()
{
// Call the next effect.
effects->postPaintScreen();
if (m_valid && m_enabled) {
// Disable render texture
GLRenderTarget* target = effects->popRenderTarget();
assert( target == m_fbo );
Q_UNUSED( target );
m_texture->bind();
// Use the shader
ShaderManager::instance()->pushShader(m_shader);
m_shader->setUniform("u_zoom", (float)zoom);
m_shader->setUniform("u_radius", (float)radius);
m_shader->setUniform("u_cursor", QVector2D(cursorPos().x(), cursorPos().y()));
m_vbo->render(GL_TRIANGLES);
ShaderManager::instance()->popShader();
m_texture->unbind();
}
}
} // namespace
#include "lookingglass.moc"
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