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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QtGui>
#include <QtWidgets>
class GLWindow : public QWindow
{
public:
GLWindow(Qt::WindowFlags flags)
: gl(0)
{
setFlags(flags);
setSurfaceType(OpenGLSurface);
QSurfaceFormat format;
format.setAlphaBufferSize(8);
format.setSamples(16);
setFormat(format);
}
void exposeEvent(QExposeEvent *)
{
if (!isExposed())
return;
if (!gl) {
gl = new QOpenGLContext();
gl->setFormat(requestedFormat());
gl->create();
}
gl->makeCurrent(this);
QOpenGLShaderProgram prog;
prog.addShaderFromSourceCode(QOpenGLShader::Vertex,
"attribute highp vec4 a_Pos;"
"attribute lowp vec4 a_Color;"
"varying lowp vec4 v_Color;"
"void main() {"
" gl_Position = a_Pos;"
" v_Color = a_Color;"
"}");
prog.addShaderFromSourceCode(QOpenGLShader::Fragment,
"varying lowp vec4 v_Color;"
"void main() {"
" gl_FragColor = v_Color;"
"}");
prog.bind();
QOpenGLFunctions *functions = gl->functions();
functions->glClearColor(0, 0, 0, 0);
functions->glClear(GL_COLOR_BUFFER_BIT);
functions->glViewport(0, 0, width(), height());
prog.enableAttributeArray("a_Pos");
prog.enableAttributeArray("a_Color");
float coords[] = { -0.7f, 0.7f,
0.8f, 0.8f,
-0.8f, -0.8f,
0.7f, -0.7f };
float colors[] = { 1, 0, 0, 1,
0, 1, 0, 1,
0, 0, 1, 1,
0, 0, 0, 0 };
prog.setAttributeArray("a_Pos", GL_FLOAT, coords, 2, 0);
prog.setAttributeArray("a_Color", GL_FLOAT, colors, 4, 0);
functions->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
prog.disableAttributeArray("a_Pos");
prog.disableAttributeArray("a_Color");
gl->swapBuffers(this);
}
void mousePressEvent(QMouseEvent *)
{
QCoreApplication::quit();
}
private:
QOpenGLContext *gl;
};
class Widget : public QWidget
{
public:
Widget(Qt::WindowFlags flags)
: QWidget(0, flags)
{
setAttribute(Qt::WA_TranslucentBackground);
}
void paintEvent(QPaintEvent *)
{
QPainter p(this);
p.setRenderHint(QPainter::Antialiasing);
p.fillRect(rect(), QColor("steelblue"));
int w = width();
int h = height();
int w2 = width() / 2;
int h2 = height() / 2;
QPainterPath path;
path.moveTo(0, 0);
path.cubicTo(w2, 0, w2, h2, w, h);
path.cubicTo(w2, h, w2, h2, 0, 0);
QLinearGradient lg(0, 0, w, h);
lg.setColorAt(0.0, Qt::transparent);
lg.setColorAt(0.5, QColor("palegreen"));
lg.setColorAt(1.0, Qt::transparent);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.fillPath(path, lg);
}
void mousePressEvent(QMouseEvent *)
{
QCoreApplication::quit();
}
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
// mask: on/off
// opacity: on/off
for (int i=0; i<4; ++i) {
bool mask = i & 0x1;
bool opacity = i & 0x2;
Qt::WindowFlags flags = Qt::FramelessWindowHint;
Widget *widget = new Widget(flags);
GLWindow *window = new GLWindow(flags);
widget->setGeometry(100 + 100 * i, 100, 80, 80);
window->setGeometry(100 + 100 * i, 200, 80, 80);
if (mask) {
QRegion region(0, 0, 80, 80, QRegion::Ellipse);
widget->setMask(region);
window->setMask(region);
}
if (opacity) {
widget->setWindowOpacity(0.5);
window->setOpacity(0.5);
}
widget->show();
window->show();
}
return app.exec();
}
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