From d66907ba6777a858aea95d73c470a3e0d820a16d Mon Sep 17 00:00:00 2001
From: AnyOldName3 <krizdjali@gmail.com>
Date: Wed, 15 Dec 2021 22:17:38 +0000
Subject: [PATCH] Log OpenGL Vendor, Renderer and Version on startup

---
 apps/openmw/engine.cpp        | 21 ++++++++++++++++++++-
 components/sceneutil/util.cpp | 16 ++++++++++++++++
 components/sceneutil/util.hpp | 12 ++++++++++++
 3 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/apps/openmw/engine.cpp b/apps/openmw/engine.cpp
index 5c9e915703..1a73ae3531 100644
--- a/apps/openmw/engine.cpp
+++ b/apps/openmw/engine.cpp
@@ -43,6 +43,7 @@
 
 #include <components/sceneutil/screencapture.hpp>
 #include <components/sceneutil/depth.hpp>
+#include <components/sceneutil/util.hpp>
 
 #include "mwinput/inputmanagerimp.hpp"
 
@@ -239,6 +240,20 @@ namespace
     {
         void operator()(std::string) const {}
     };
+
+    class IdentifyOpenGLOperation : public osg::GraphicsOperation
+    {
+    public:
+        IdentifyOpenGLOperation() : GraphicsOperation("IdentifyOpenGLOperation", false)
+        {}
+
+        void operator()(osg::GraphicsContext* graphicsContext) override
+        {
+            Log(Debug::Info) << "OpenGL Vendor: " << glGetString(GL_VENDOR);
+            Log(Debug::Info) << "OpenGL Renderer: " << glGetString(GL_RENDERER);
+            Log(Debug::Info) << "OpenGL Version: " << glGetString(GL_VERSION);
+        }
+    };
 }
 
 void OMW::Engine::executeLocalScripts()
@@ -643,8 +658,12 @@ void OMW::Engine::createWindow(Settings::Manager& settings)
     camera->setGraphicsContext(graphicsWindow);
     camera->setViewport(0, 0, graphicsWindow->getTraits()->width, graphicsWindow->getTraits()->height);
 
+    osg::ref_ptr<SceneUtil::OperationSequence> realizeOperations = new SceneUtil::OperationSequence(false);
+    mViewer->setRealizeOperation(realizeOperations);
+    realizeOperations->add(new IdentifyOpenGLOperation());
+
     if (Debug::shouldDebugOpenGL())
-        mViewer->setRealizeOperation(new Debug::EnableGLDebugOperation());
+        realizeOperations->add(new Debug::EnableGLDebugOperation());
 
     mViewer->realize();
 
diff --git a/components/sceneutil/util.cpp b/components/sceneutil/util.cpp
index 7065fae933..33d8f1c8a6 100644
--- a/components/sceneutil/util.cpp
+++ b/components/sceneutil/util.cpp
@@ -317,4 +317,20 @@ bool attachAlphaToCoverageFriendlyFramebufferToCamera(osg::Camera* camera, osg::
     return addMSAAIntermediateTarget;
 }
 
+OperationSequence::OperationSequence(bool keep)
+    : Operation("OperationSequence", keep)
+    , mOperationQueue(new osg::OperationQueue())
+{
+}
+
+void OperationSequence::operator()(osg::Object* object)
+{
+    mOperationQueue->runOperations(object);
+}
+
+void OperationSequence::add(osg::Operation* operation)
+{
+    mOperationQueue->add(operation);
+}
+
 }
diff --git a/components/sceneutil/util.hpp b/components/sceneutil/util.hpp
index ddc2db845d..89d3a12e97 100644
--- a/components/sceneutil/util.hpp
+++ b/components/sceneutil/util.hpp
@@ -63,6 +63,18 @@ namespace SceneUtil
 
     // Alpha-to-coverage requires a multisampled framebuffer, so we need to set that up for RTTs
     bool attachAlphaToCoverageFriendlyFramebufferToCamera(osg::Camera* camera, osg::Camera::BufferComponent buffer, osg::Texture* texture, unsigned int level = 0, unsigned int face = 0, bool mipMapGeneration = false);
+
+    class OperationSequence : public osg::Operation
+    {
+    public:
+        OperationSequence(bool keep);
+
+        void operator()(osg::Object* object) override;
+
+        void add(osg::Operation* operation);
+    protected:
+        osg::ref_ptr<osg::OperationQueue> mOperationQueue;
+    };
 }
 
 #endif