added image saving

headers/Mandelbrot.h

@@ -7,18 +7,23 @@
 class Mandelbrot : public QObject, protected QOpenGLExtraFunctions {
 	Q_OBJECT
 public:
-	void init();
+	void init(GLuint);
-	void draw(GLuint, QOpenGLShaderProgram&);
+	void draw();
 	void setIterations(int);
 	void translateRelative(QVector2D);
 	void zoomRelative(int, QVector2D);
 	void resizeRelative(QVector2D);
+	bool initShader();
 private:
 	int iterations = 0;
 	QVector2D origin {-2, -1};
 	QVector2D size {2, 2};
 	float zoomModifier = 1.05;
-	void setShaderValues(QOpenGLShaderProgram&) const;
+
+	GLuint vao;
+
+	QOpenGLShaderProgram shader;
+	void setShaderValues();
 };
 
 

headers/OutputWidget.h

@@ -13,6 +13,7 @@ class OutputWidget : public QOpenGLWidget, protected QOpenGLExtraFunctions {
 public:
 	explicit OutputWidget(QWidget* parent): QOpenGLWidget(parent) {}
 	Mandelbrot& getMandelbrot() {return mandelbrot;}
+	void saveToImage(const std::function<void(void)>&, const std::function<void(bool)>&);
 private:
 	void initializeGL() override;
 	void paintGL() override;
@@ -27,11 +28,7 @@ private:
 	QPoint mousePos;
 	QSize oldSize {0, 0};
 
-	void initShader();
-	static std::vector<QVector2D> genVertices();
 	GLuint createVAO();
-	GLuint vao {};
-	QOpenGLShaderProgram shader;
 
 	Mandelbrot mandelbrot;
 };

src/MainWindow.cpp

@@ -2,6 +2,7 @@
 #include <QSlider>
 #include <QLabel>
 #include <iostream>
+#include <QPushButton>
 #include "../headers/MainWindow.h"
 
 MainWindow::MainWindow(): outputWidget(OutputWidget(this)) {
@@ -28,10 +29,29 @@ void MainWindow::buildUI() {
 			});
 	iterationsSlider->setValue(100);
 
+	auto saveInfo = new QLabel;
+	auto saveButton = new QPushButton("Save high resolution image");
+	connect(
+			saveButton,
+			&QPushButton::clicked,
+			this,
+			[this, saveInfo](){
+				saveInfo->setText("Receiving image...");
+				update();
+				this->outputWidget.saveToImage([saveInfo](){
+					saveInfo->setText("Saving...");
+				}, [saveInfo](bool success){
+					QString result = success ? "Success" : "Failure";
+					saveInfo->setText(result);
+				});
+			});
+
 	auto controls = new QGridLayout;
 	controls->addWidget(iterationsCaption, 1, 1);
 	controls->addWidget(iterationsLabel, 1, 2);
 	controls->addWidget(iterationsSlider, 1, 3);
+	controls->addWidget(saveInfo, 2, 1, 1, 2);
+	controls->addWidget(saveButton, 2, 3, 1, 1);
 
 	auto lyt = new QVBoxLayout(this);
 	lyt->addWidget(&outputWidget);

src/Mandelbrot.cpp

@@ -1,19 +1,31 @@
+#include <QImage>
+#include <iostream>
+#include <QOpenGLWidget>
 #include "../headers/Mandelbrot.h"
 
-void Mandelbrot::init() {
+void Mandelbrot::init(GLuint vaoId) {
 	initializeOpenGLFunctions();
+	vao = vaoId;
 }
 
-void Mandelbrot::draw(GLuint vao, QOpenGLShaderProgram& shader) {
+void Mandelbrot::draw() {
 	glClear(GL_COLOR_BUFFER_BIT);
 	shader.bind();
-	setShaderValues(shader);
+	setShaderValues();
 	glBindVertexArray(vao);
-	glDrawArrays(GL_QUADS, 0, 4);
+	glDrawArrays(GL_TRIANGLES, 0, 6);
 	glBindVertexArray(0);
 }
 
-void Mandelbrot::setShaderValues(QOpenGLShaderProgram &shader) const {
+bool Mandelbrot::initShader() {
+	if (!shader.addShaderFromSourceFile(QOpenGLShader::Vertex, "Vertex.glsl")) return false;
+	if (!shader.addShaderFromSourceFile(QOpenGLShader::Fragment, "Fragment.glsl")) return false;
+	if (!shader.link()) return false;
+	if (!shader.bind()) return false;
+	return true;
+}
+
+void Mandelbrot::setShaderValues() {
 	shader.setUniformValue("origin", origin);
 	shader.setUniformValue("size", size);
 	shader.setUniformValue("iterationCount", iterations);

src/OutputWidget.cpp

@@ -1,5 +1,10 @@
 #include <iostream>
 #include <QResource>
+#include <thread>
+#include <future>
+#include <QOpenGLFramebufferObject>
+#include <QFileDialog>
+#include <utility>
 #include "../headers/OutputWidget.h"
 
 using std::cout, std::endl;
@@ -7,19 +12,28 @@ using std::cout, std::endl;
 void OutputWidget::initializeGL() {
 	cout << "Initialize OpenGL" << endl;
 	initializeOpenGLFunctions();
-	getMandelbrot().init();
+	getMandelbrot().init(createVAO());
-	initShader();
+	if (!getMandelbrot().initShader()) close();
 
 	auto format = this->format();
 	cout << "OpenGL version: " << format.majorVersion() << "." << format.minorVersion() << endl;
 
-	vao = createVAO();
-
 	glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
 }
 
 void OutputWidget::paintGL() {
-	getMandelbrot().draw(vao, shader);
+	getMandelbrot().draw();
+}
+
+std::vector<QVector2D> genVertices() {
+	return {
+			{-1, -1},
+			{1, -1},
+			{1, 1},
+			{1, 1},
+			{-1, 1},
+			{-1, -1}
+	};
 }
 
 GLuint OutputWidget::createVAO() {
@@ -44,23 +58,6 @@ GLuint OutputWidget::createVAO() {
 	return vaoId;
 }
 
-std::vector<QVector2D> OutputWidget::genVertices() {
-	return {
-			{-1, -1},
-			{1, -1},
-			{1, 1},
-			{-1, 1}
-	};
-}
-
-void OutputWidget::initShader() {
-	if (!shader.addShaderFromSourceFile(QOpenGLShader::Vertex, "Vertex.glsl")) close();
-	if (!shader.addShaderFromSourceFile(QOpenGLShader::Fragment, "Fragment.glsl")) close();
-	if (!shader.link()) close();
-	if (!shader.bind()) close();
-}
-
-
 QVector2D divide(QPoint p, QSize s){
 	return {
 			float(p.x()) / float(s.width()),
@@ -113,3 +110,38 @@ void OutputWidget::mouseReleaseEvent(QMouseEvent *e) {
 void OutputWidget::keyPressEvent(QKeyEvent *e) {
 
 }
+
+void OutputWidget::saveToImage(const std::function<void(void)>& receiveCb, const std::function<void(bool)>& saveCb) {
+	double maxSize = pow(2, 14);
+
+	double div = double(width()) / height();
+	int w, h;
+	if (div > 1){
+		w = int(maxSize);
+		h = int(maxSize / div);
+	} else {
+		h = int(maxSize);
+		w = int(maxSize * div);
+	}
+
+	QOpenGLFramebufferObject fbo(w, h);
+	fbo.bind();
+
+	glViewport(0, 0, w, h);
+	getMandelbrot().draw();
+	QOpenGLFramebufferObject::bindDefault();
+
+	QImage img = fbo.toImage();
+	receiveCb();
+
+	QString fileName = QFileDialog::getSaveFileName(this, "", "", tr("Images (*.png *.xpm *.jpg)"));
+	if (fileName.isNull()){
+		saveCb(false);
+		return;
+	}
+
+	std::thread job([saveCb](const QImage& img, const QString& fileName) {
+		saveCb(img.save(fileName));
+	}, img, fileName);
+	job.detach();
+}