Show OpenGL version on debug overlay

Somewhat messy, because the OpenGL context only exists in the renderer
thread.

src/player/PlayerQuickItem.cpp

@@ -211,6 +211,20 @@ void PlayerQuickItem::onSynchronize()
     window()->setPersistentOpenGLContext(true);
     window()->setPersistentSceneGraph(true);
     window()->setClearBeforeRendering(false);
+    m_debugInfo = "";
+    QOpenGLContext* glctx = QOpenGLContext::currentContext();
+    if (glctx && glctx->isValid())
+    {
+      m_debugInfo += "\nOpenGL:\n";
+      int syms[4] = {GL_VENDOR, GL_RENDERER, GL_VERSION, GL_SHADING_LANGUAGE_VERSION};
+      for (auto sym : syms)
+      {
+        auto s = (char *)glctx->functions()->glGetString(sym);
+        if (s)
+          m_debugInfo += QString("  ") + QString::fromUtf8(s) + "\n";
+      }
+      m_debugInfo += "\n";
+    }
   }
   if (m_renderer)
     m_renderer->m_size = window()->size() * window()->devicePixelRatio();

src/player/PlayerQuickItem.h

@@ -36,6 +36,7 @@ public:
     PlayerQuickItem(QQuickItem* parent = 0);
     virtual ~PlayerQuickItem();
     void initMpv(PlayerComponent* player);
+    QString debugInfo() { return m_debugInfo; }
 
 signals:
     void onUpdate();
@@ -52,6 +53,7 @@ private:
     mpv::qt::Handle m_mpv;
     mpv_opengl_cb_context* m_mpvGL;
     PlayerRenderer* m_renderer;
+    QString m_debugInfo;
 };
 
 #endif

src/ui/KonvergoWindow.cpp

@@ -10,6 +10,7 @@
 #include "settings/SettingsSection.h"
 #include "system/SystemComponent.h"
 #include "player/PlayerComponent.h"
+#include "player/PlayerQuickItem.h"
 #include "display/DisplayComponent.h"
 #include "QsLog.h"
 #include "power/PowerComponent.h"
@@ -321,6 +322,9 @@ void KonvergoWindow::updateDebugInfo()
     m_systemDebugInfo = SystemComponent::Get().debugInformation();
   m_debugInfo = m_systemDebugInfo;
   m_debugInfo += DisplayComponent::Get().debugInformation();
+  PlayerQuickItem* video = findChild<PlayerQuickItem*>("video");
+  if (video)
+    m_debugInfo += video->debugInfo();
   m_videoInfo = PlayerComponent::Get().videoInformation();
   emit debugInfoChanged();
 }