Significantly improve renderer performance

src/qt/qt_gleswidget.cpp

@@ -1,4 +1,5 @@
 #include <QApplication>
+#include <QImage>
 #include "qt_gleswidget.hpp"
 #ifdef __APPLE__
 #include <CoreGraphics/CoreGraphics.h>
@@ -53,13 +54,20 @@ void GLESWidget::resizeGL(int w, int h)
 void GLESWidget::initializeGL()
 {
     initializeOpenGLFunctions();
+    connect(this, &GLESWidget::reqUpdate, this, &GLESWidget::reqUpdate_);
 }
+
 void GLESWidget::paintGL()
 {
     QPainter painter(this);
-    //painter.fillRect(rect, QColor(0, 0, 0));
+    painter.drawImage(QRect(0, 0, width(), height()), m_image.convertToFormat(QImage::Format_RGBX8888), QRect(sx, sy, sw, sh));
-    painter.drawImage(QRect(0, 0, width(), height()), m_image.convertToFormat(QImage::Format_RGBA8888), QRect(sx, sy, sw, sh));
     painter.end();
+    firstupdate = true;
+}
+
+void GLESWidget::reqUpdate_()
+{
+    update();
 }
 
 void GLESWidget::mouseReleaseEvent(QMouseEvent *event)
@@ -114,8 +122,7 @@ void GLESWidget::mouseMoveEvent(QMouseEvent *event)
 
 void GLESWidget::qt_real_blit(int x, int y, int w, int h)
 {
-    // printf("Offpainter thread ID: %X\n", SDL_ThreadID());
+    if ((w <= 0) || (h <= 0) || (w > 2048) || (h > 2048) || (buffer32 == NULL) || !firstupdate)
-    if ((w <= 0) || (h <= 0) || (w > 2048) || (h > 2048) || (buffer32 == NULL))
     {
         video_blit_complete();
         return;
@@ -124,7 +131,7 @@ void GLESWidget::qt_real_blit(int x, int y, int w, int h)
     sy = y;
     sw = this->w = w;
     sh = this->h = h;
-    auto imagebits = m_image.bits();
+    static auto imagebits = m_image.bits();
     for (int y1 = y; y1 < (y + h - 1); y1++)
     {
         auto scanline = imagebits + (y1 * (2048 + 64) * 4);
@@ -135,5 +142,5 @@ void GLESWidget::qt_real_blit(int x, int y, int w, int h)
         video_screenshot((uint32_t *)imagebits, 0, 0, 2048 + 64);
     }
     video_blit_complete();
-    update();
+    this->reqUpdate();
 }

src/qt/qt_gleswidget.hpp

@@ -6,6 +6,8 @@
 #include <QEvent>
 #include <QKeyEvent>
 
+#include <atomic>
+
 class GLESWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
 	Q_OBJECT
@@ -38,9 +40,13 @@ public:
     {
         event->ignore();
     }
+signals:
+    void reqUpdate();
+
 public slots:
 	void qt_real_blit(int x, int y, int w, int h);
     void qt_mouse_poll();
+    void reqUpdate_();
 
 private:
     struct mouseinputdata {
@@ -48,5 +54,5 @@ private:
         int mousebuttons;
     };
     mouseinputdata mousedata;
-
+    std::atomic<bool> firstupdate{false};
 };

src/qt/qt_mainwindow.cpp

@@ -44,8 +44,6 @@ MainWindow::MainWindow(QWidget *parent) :
     video_setblit(qt_blit);
     ui->glesWidget->setMouseTracking(true);
 
-    connect(this, &MainWindow::blitToWidget, ui->glesWidget, &GLESWidget::qt_real_blit);
-
     connect(this, &MainWindow::showMessageForNonQtThread, this, &MainWindow::showMessage_, Qt::BlockingQueuedConnection);
 
     connect(this, &MainWindow::setTitleForNonQtThread, this, &MainWindow::setTitle_, Qt::BlockingQueuedConnection);
@@ -702,6 +700,11 @@ void MainWindow::keyPressEvent(QKeyEvent* event)
     }
 }
 
+void MainWindow::blitToWidget(int x, int y, int w, int h)
+{
+    ui->glesWidget->qt_real_blit(x, y, w, h);
+}
+
 void MainWindow::keyReleaseEvent(QKeyEvent* event)
 {
 #ifdef __APPLE__

src/qt/qt_mainwindow.hpp

@@ -22,9 +22,9 @@ public:
     void showMessage(const QString& header, const QString& message);
     void setTitle(const wchar_t* title);
     void getTitle(wchar_t* title);
+    void blitToWidget(int x, int y, int w, int h);
 signals:
     void paint(const QImage& image);
-    void blitToWidget(int x, int y, int w, int h);
     void resizeContents(int w, int h);
     void pollMouse();
     void updateStatusBarPanes();