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kwin/effects/lookingglass/lookingglass.cpp
Martin Gräßlin 9aeb2f7907 [effects] Use shader traits API for lookingglass 
In the long run this effect needs to be modified. Rendering the complete
scene to an FBO is not the best approach.
2016-01-25 14:11:54 +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"
// KConfigSkeleton
#include "lookingglassconfig.h"
#include <QAction>
#include <kwinglutils.h>
#include <kwinglplatform.h>
#include <KStandardAction>
#include <KGlobalAccel>
#include <KLocalizedString>
#include <QVector2D>
#include <QFile>
#include <kmessagebox.h>
#include <cmath>
namespace KWin
{
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)
{
QAction* a;
a = KStandardAction::zoomIn(this, SLOT(zoomIn()), this);
KGlobalAccel::self()->setDefaultShortcut(a, QList<QKeySequence>() << Qt::META + Qt::Key_Equal);
KGlobalAccel::self()->setShortcut(a, QList<QKeySequence>() << Qt::META + Qt::Key_Equal);
effects->registerGlobalShortcut(Qt::META + Qt::Key_Equal, a);
a = KStandardAction::zoomOut(this, SLOT(zoomOut()), this);
KGlobalAccel::self()->setDefaultShortcut(a, QList<QKeySequence>() << Qt::META + Qt::Key_Minus);
KGlobalAccel::self()->setShortcut(a, QList<QKeySequence>() << Qt::META + Qt::Key_Minus);
effects->registerGlobalShortcut(Qt::META + Qt::Key_Minus, a);
a = KStandardAction::actualSize(this, SLOT(toggle()), this);
KGlobalAccel::self()->setDefaultShortcut(a, QList<QKeySequence>() << Qt::META + Qt::Key_0);
KGlobalAccel::self()->setShortcut(a, QList<QKeySequence>() << Qt::META + Qt::Key_0);
effects->registerGlobalShortcut(Qt::META + Qt::Key_0, a);
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()
{
return effects->compositingType() == OpenGL2Compositing;
}
void LookingGlassEffect::reconfigure(ReconfigureFlags)
{
LookingGlassConfig::self()->read();
initialradius = LookingGlassConfig::radius();
radius = initialradius;
qCDebug(KWINEFFECTS) << "Radius from config:" << radius;
m_valid = loadData();
}
bool LookingGlassEffect::loadData()
{
const QSize screenSize = effects->virtualScreenSize();
int texw = screenSize.width();
int texh = screenSize.height();
// Create texture and render target
const int levels = std::log2(qMin(texw, texh)) + 1;
m_texture = new GLTexture(GL_RGBA8, texw, texh, levels);
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;
}
QString shadersDir = QStringLiteral("kwin/shaders/1.10/");
const qint64 coreVersionNumber = GLPlatform::instance()->isGLES() ? kVersionNumber(3, 0) : kVersionNumber(1, 40);
if (GLPlatform::instance()->glslVersion() >= coreVersionNumber)
shadersDir = QStringLiteral("kwin/shaders/1.40/");
const QString fragmentshader = QStandardPaths::locate(QStandardPaths::GenericDataLocation, shadersDir + QStringLiteral("lookingglass.frag"));
QFile ff(fragmentshader);
if (!ff.open(QIODevice::ReadOnly)) {
qCCritical(KWINEFFECTS) << "Failed to read shader!";
return false;
}
m_shader = ShaderManager::instance()->generateCustomShader(ShaderTrait::MapTexture, QByteArray(), ff.readAll());
if (m_shader->isValid()) {
ShaderBinder binder(m_shader);
m_shader->setUniform("u_textureSize", QVector2D(screenSize.width(), screenSize.height()));
} else {
qCCritical(KWINEFFECTS) << "The shader failed to load!";
return false;
}
m_vbo = new GLVertexBuffer(GLVertexBuffer::Static);
QVector<float> verts;
QVector<float> texcoords;
texcoords << screenSize.width() << 0.0;
verts << screenSize.width() << 0.0;
texcoords << 0.0 << 0.0;
verts << 0.0 << 0.0;
texcoords << 0.0 << screenSize.height();
verts << 0.0 << screenSize.height();
texcoords << 0.0 << screenSize.height();
verts << 0.0 << screenSize.height();
texcoords << screenSize.width() << screenSize.height();
verts << screenSize.width() << screenSize.height();
texcoords << screenSize.width() << 0.0;
verts << screenSize.width() << 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);
qCDebug(KWINEFFECTS) << "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::paintScreen(int mask, QRegion region, ScreenPaintData &data)
{
// Call the next effect.
effects->paintScreen(mask, region, data);
if (m_valid && m_enabled) {
// Disable render texture
GLRenderTarget* target = GLRenderTarget::popRenderTarget();
assert(target == m_fbo);
Q_UNUSED(target);
m_texture->bind();
m_texture->generateMipmaps();
// Use the shader
ShaderBinder binder(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_shader->setUniform(GLShader::ModelViewProjectionMatrix, data.projectionMatrix());
m_vbo->render(GL_TRIANGLES);
m_texture->unbind();
}
}
bool LookingGlassEffect::isActive() const
{
return m_valid && m_enabled;
}
} // namespace
#include "lookingglass.moc"
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