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kwin/effects/lookingglass/lookingglass.cpp
Martin Gräßlin a79eacaed7 Properly detect effects which need OpenGL 2 
Effects that need GLSL require that OpenGL 2 is active.
It does not matter whether the GPU would support it if
OpenGL 2 is not used.

Cherry-picked from db42152

CCBUG: 299426
2012-05-05 10:27:19 +02:00

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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 <kwinglplatform.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()
: 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));
connect(effects, SIGNAL(mouseChanged(QPoint,QPoint,Qt::MouseButtons,Qt::MouseButtons,Qt::KeyboardModifiers,Qt::KeyboardModifiers)),
this, SLOT(slotMouseChanged(QPoint,QPoint,Qt::MouseButtons,Qt::MouseButtons,Qt::KeyboardModifiers,Qt::KeyboardModifiers)));
reconfigure(ReconfigureAll);
}
LookingGlassEffect::~LookingGlassEffect()
{
delete m_texture;
delete m_fbo;
delete m_shader;
delete m_vbo;
}
bool LookingGlassEffect::supported()
{
if (effects->compositingType() == OpenGLCompositing) {
return ShaderManager::instance()->isValid() && GLRenderTarget::supported();
} else {
return false;
}
}
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();
}
if (zoom == target_zoom) {
m_enabled = false;
}
}
effects->addRepaint(cursorPos().x() - radius, cursorPos().y() - radius, 2 * radius, 2 * radius);
}
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;
if (polling) {
polling = false;
effects->stopMousePolling();
}
if (zoom == target_zoom) {
m_enabled = false;
}
}
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
GLRenderTarget::pushRenderTarget(m_fbo);
}
effects->prePaintScreen(data, time);
}
void LookingGlassEffect::slotMouseChanged(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 = GLRenderTarget::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();
}
}
bool LookingGlassEffect::isActive() const
{
return m_valid && m_enabled;
}
} // namespace
#include "lookingglass.moc"
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