yukijoou/kwin
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
kwin/effects/lookingglass/lookingglass.cpp
Vlad Zahorodnii 9f2cb0ae1b Provide expected presentation time to effects 
Effects are given the interval between two consecutive frames. The main
flaw of this approach is that if the Compositor transitions from the idle
state to "active" state, i.e. when there is something to repaint,
effects may see a very large interval between the last painted frame and
the current. In order to address this issue, the Scene invalidates the
timer that is used to measure time between consecutive frames before the
Compositor is about to become idle.

While this works perfectly fine with Xinerama-style rendering, with per
screen rendering, determining whether the compositor is about to idle is
rather a tedious task mostly because a single output can't be used for
the test.

Furthermore, since the Compositor schedules pointless repaints just to
ensure that it's idle, it might take several attempts to figure out
whether the scene timer must be invalidated if you use (true) per screen
rendering.

Ideally, all effects should use a timeline helper that is aware of the
underlying render loop and its timings. However, this option is off the
table because it will involve a lot of work to implement it.

Alternative and much simpler option is to pass the expected presentation
time to effects rather than time between consecutive frames. This means
that effects are responsible for determining how much animation timelines
have to be advanced. Typically, an effect would have to store the
presentation timestamp provided in either prePaint{Screen,Window} and
use it in the subsequent prePaint{Screen,Window} call to estimate the
amount of time passed between the next and the last frames.

Unfortunately, this is an API incompatible change. However, it shouldn't
take a lot of work to port third-party binary effects, which don't use the
AnimationEffect class, to the new API. On the bright side, we no longer
need to be concerned about the Compositor getting idle.

We do still try to determine whether the Compositor is about to idle,
primarily, because the OpenGL render backend swaps buffers on present,
but that will change with the ongoing compositing timing rework.
2020-12-10 07:14:42 +00:00

253 lines
7.9 KiB
C++
Raw Blame History

/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2007 Rivo Laks <rivolaks@hot.ee>
SPDX-FileCopyrightText: 2007 Christian Nitschkowski <christian.nitschkowski@kdemail.net>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#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(nullptr)
, m_fbo(nullptr)
, m_vbo(nullptr)
, m_shader(nullptr)
, m_lastPresentTime(std::chrono::milliseconds::zero())
, m_enabled(false)
, m_valid(false)
{
initConfig<LookingGlassConfig>();
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, &EffectsHandler::mouseChanged, this, &LookingGlassEffect::slotMouseChanged);
reconfigure(ReconfigureAll);
}
LookingGlassEffect::~LookingGlassEffect()
{
delete m_texture;
delete m_fbo;
delete m_shader;
delete m_vbo;
}
bool LookingGlassEffect::supported()
{
return effects->compositingType() == OpenGL2Compositing && !GLPlatform::instance()->supports(LimitedNPOT);
}
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;
}
m_shader = ShaderManager::instance()->generateShaderFromResources(ShaderTrait::MapTexture, QString(), QStringLiteral("lookingglass.frag"));
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, std::chrono::milliseconds presentTime)
{
const int time = m_lastPresentTime.count() ? (presentTime - m_lastPresentTime).count() : 0;
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 (zoom != target_zoom) {
m_lastPresentTime = presentTime;
} else {
m_lastPresentTime = std::chrono::milliseconds::zero();
}
if (m_valid && m_enabled) {
data.mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
// Start rendering to texture
GLRenderTarget::pushRenderTarget(m_fbo);
}
effects->prePaintScreen(data, presentTime);
}
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, const 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();
Q_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
Reference in a new issue View git blame Copy permalink