added software renderer. split common functions prev.

in gleswidget to renderstack (a QStackWidget), which in
turn calls an actual renderer. added ability to target GLES
directly, but this is maybe uneeded.

src/qt/qt_hardwarerenderer.hpp

@@ -0,0 +1,55 @@
+#pragma once
+
+#include <QOpenGLFunctions>
+#include <QOpenGLWidget>
+#include <QPainter>
+#include <QEvent>
+#include <QKeyEvent>
+
+#include <atomic>
+#include <mutex>
+#include <QApplication>
+
+#ifdef WAYLAND
+#include "wl_mouse.hpp"
+#endif
+
+class HardwareRenderer : public QOpenGLWidget, protected QOpenGLFunctions
+{
+	Q_OBJECT
+
+private:
+    bool wayland = false;
+public:
+    void resizeGL(int w, int h) override;
+    void initializeGL() override;
+    void paintGL() override;
+    HardwareRenderer(QWidget* parent = nullptr)
+    : QOpenGLWidget(parent), QOpenGLFunctions()
+    {
+        setMinimumSize(16, 16);
+#ifdef WAYLAND
+        if (QApplication::platformName().contains("wayland")) {
+            wayland = true;
+            wl_init();
+        }
+#endif
+    }
+    ~HardwareRenderer()
+    {
+        makeCurrent();
+    }
+
+    enum class RenderType {
+        OpenGL,
+        OpenGLES,
+    };
+    void setRenderType(RenderType type);
+
+public slots:
+    void onBlit(const QImage& img, int, int, int, int);
+
+private:
+    QImage image;
+    int sx, sy, sw, sh;
+};