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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#define GL_GLEXT_PROTOTYPES
#include "openglwidget.h"
#include <QtWidgets/private/qwidget_p.h>
#include <QOpenGLFramebufferObject>
#include <QWindow>
#include <qpa/qplatformwindow.h>
#include <QDebug>
#include <QTimer>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QGuiApplication>
#include <QtGui/QMatrix4x4>
#include <QOpenGLShaderProgram>
#include <QtGui/QScreen>
#include <QtCore/qmath.h>
#include <qopengl.h>
class OpenGLWidgetPrivate : protected QOpenGLFunctions
{
public:
OpenGLWidgetPrivate(QWidget *q)
: m_program(0), m_frame(0), q(q)
{
}
void initialize();
void render();
int width() {return w;}
int height() {return h;}
GLuint m_posAttr;
GLuint m_colAttr;
GLuint m_matrixUniform;
QOpenGLShaderProgram *m_program;
int m_frame;
int w,h;
QWidget *q;
int m_interval;
QVector3D m_rotAxis;
float clearColor[3];
};
OpenGLWidget::OpenGLWidget(int interval, const QVector3D &rotAxis, QWidget *parent)
: QOpenGLWidget(parent)
{
d.reset(new OpenGLWidgetPrivate(this));
d->clearColor[0] = d->clearColor[1] = d->clearColor[2] = 0.0f;
d->m_interval = interval;
d->m_rotAxis = rotAxis;
if (interval > 0) {
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(update()));
timer->start(interval);
}
}
OpenGLWidget::~OpenGLWidget()
{
}
void OpenGLWidget::initializeGL()
{
// qDebug("*initializeGL*");
d->initialize();
}
void OpenGLWidget::resizeGL(int w, int h)
{
// qDebug("*resizeGL*");
d->w = w;
d->h = h;
}
void OpenGLWidget::paintGL()
{
// qDebug("*paintGL* %d", d->m_frame);
d->render();
}
static const char *vertexShaderSource =
"attribute highp vec4 posAttr;\n"
"attribute lowp vec4 colAttr;\n"
"varying lowp vec4 col;\n"
"uniform highp mat4 matrix;\n"
"void main() {\n"
" col = colAttr;\n"
" gl_Position = matrix * posAttr;\n"
"}\n";
static const char *fragmentShaderSource =
"varying lowp vec4 col;\n"
"void main() {\n"
" gl_FragColor = col;\n"
"}\n";
void OpenGLWidgetPrivate::initialize()
{
initializeOpenGLFunctions();
m_program = new QOpenGLShaderProgram;
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
m_program->link();
m_posAttr = m_program->attributeLocation("posAttr");
m_colAttr = m_program->attributeLocation("colAttr");
m_matrixUniform = m_program->uniformLocation("matrix");
}
void OpenGLWidgetPrivate::render()
{
const qreal retinaScale = q->devicePixelRatio();
glViewport(0, 0, width() * retinaScale, height() * retinaScale);
glClearColor(clearColor[0], clearColor[1], clearColor[2], 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
m_program->bind();
QMatrix4x4 matrix;
matrix.perspective(60.0f, 4.0f/3.0f, 0.1f, 100.0f);
matrix.translate(0, 0, -2);
const qreal angle = 100.0f * m_frame / 30;
matrix.rotate(angle, m_rotAxis);
m_program->setUniformValue(m_matrixUniform, matrix);
GLfloat vertices[] = {
0.0f, 0.707f,
-0.5f, -0.5f,
0.5f, -0.5f
};
GLfloat colors[] = {
1.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f
};
glVertexAttribPointer(m_posAttr, 2, GL_FLOAT, GL_FALSE, 0, vertices);
glVertexAttribPointer(m_colAttr, 3, GL_FLOAT, GL_FALSE, 0, colors);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(0);
m_program->release();
++m_frame;
if (m_interval <= 0)
q->update();
}
void OpenGLWidget::setClearColor(const float *c)
{
d->clearColor[0] = c[0];
d->clearColor[1] = c[1];
d->clearColor[2] = c[2];
}
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