Added warnings and error messages to graphics devices regarding unsupported OpenGL version

src/app/app.cpp

@@ -624,7 +624,10 @@ bool CApplication::Create()
 
     if (! m_device->Create() )
     {
-        m_errorMessage = std::string("Error in CDevice::Create()\n") + standardInfoMessage;
+        m_errorMessage = std::string("Error in CDevice::Create()\n")
+            + "\n\n"
+            + m_device->GetError()
+            + standardInfoMessage;
         m_exitCode = 5;
         return false;
     }

src/graphics/core/device.h

@@ -276,9 +276,18 @@ public:
  */
 class CDevice
 {
+protected:
+    std::string m_errorMessage;
+
 public:
     virtual ~CDevice() {}
 
+    //! Returns last error message or empty string
+    inline std::string GetError()
+    {
+        return m_errorMessage;
+    }
+
     //! Provides a hook to debug graphics code (implementation-specific)
     virtual void DebugHook() = 0;
 

src/graphics/opengl/gl21device.cpp

@@ -177,6 +177,7 @@ bool CGL21Device::Create()
         if (glewInit() != GLEW_OK)
         {
             GetLogger()->Error("GLEW initialization failed\n");
+            m_errorMessage = "An error occured while initializing GLEW.";
             return false;
         }
 
@@ -186,7 +187,11 @@ bool CGL21Device::Create()
 
         if (m_glMajor < 2)
         {
-            GetLogger()->Error("Your hardware does not support OpenGL 2.0 or 2.1.");
+            GetLogger()->Error("Unsupported OpenGL version: %d.%d\n", m_glMajor, m_glMinor);
+            GetLogger()->Error("OpenGL 2.0 or newer is required to use this engine.\n");
+            m_errorMessage = "It seems your graphics card does not support OpenGL 2.0.\n";
+            m_errorMessage += "Please make sure you have appropriate hardware and newest drivers installed.\n";
+            m_errorMessage += "(OpenGL 2.0 is roughly equivalent to Direct3D 9)";
             return false;
         }
 

src/graphics/opengl/gl33device.cpp

@@ -177,6 +177,7 @@ bool CGL33Device::Create()
         if (glewInit() != GLEW_OK)
         {
             GetLogger()->Error("GLEW initialization failed\n");
+            m_errorMessage = "An error occured while initializing GLEW.";
             return false;
         }
 
@@ -187,12 +188,18 @@ bool CGL33Device::Create()
         int glVersion = 10 * m_glMajor + m_glMinor;
         if (glVersion < 30)
         {
-            GetLogger()->Error("Your hardware does not support OpenGL 3.0+. Exiting.\n");
+            GetLogger()->Error("Unsupported OpenGL version: %d.%d\n", m_glMajor, m_glMinor);
+            GetLogger()->Error("OpenGL 3.0 or newer is required to use this engine.\n");
+            m_errorMessage = "It seems your graphics card does not support OpenGL 3.0.\n";
+            m_errorMessage += "Please make sure you have appropriate hardware and newest drivers installed.\n";
+            m_errorMessage += "(OpenGL 3.0 is roughly equivalent to Direct3D 10)";
             return false;
         }
         else if (glVersion < 33)
         {
-            GetLogger()->Warn("Full OpenGL 3.3 unavailable. Graphics might be bugged.\n");
+            GetLogger()->Warn("Partially supported OpenGL version: %d.%d\n", m_glMajor, m_glMinor);
+            GetLogger()->Warn("You may experience problems while running the game on this engine.\n");
+            GetLogger()->Warn("OpenGL 3.3 or newer is recommended.\n");
         }
         else
         {

src/graphics/opengl/gldevice.cpp

@@ -173,12 +173,24 @@ bool CGLDevice::Create()
         if (glewInit() != GLEW_OK)
         {
             GetLogger()->Error("GLEW initialization failed\n");
+            m_errorMessage = "An error occured while initializing GLEW.";
             return false;
         }
 
         // Extract OpenGL version
         const char *version = reinterpret_cast<const char*>(glGetString(GL_VERSION));
         sscanf(version, "%d.%d", &m_glMajor, &m_glMinor);
+
+        int glVersion = 10 * m_glMajor + m_glMinor;
+        if (glVersion < 13)
+        {
+            GetLogger()->Error("Unsupported OpenGL version: %d.%d\n", m_glMajor, m_glMinor);
+            GetLogger()->Error("OpenGL 1.3 or newer is required to use this engine.\n");
+            m_errorMessage = "It seems your graphics card does not support OpenGL 1.3.\n";
+            m_errorMessage += "Please make sure you have appropriate hardware and newest drivers installed.\n";
+            return false;
+        }
+
         GetLogger()->Info("OpenGL %d.%d\n", m_glMajor, m_glMinor);
 
         // Detect multitexture support
@@ -306,7 +318,7 @@ bool CGLDevice::Create()
 
     m_framebufferSupport = DetectFramebufferSupport();
     if (m_framebufferSupport != FBS_NONE)
-        GetLogger()->Debug("Framebuffer supported\n");
+        GetLogger()->Info("Framebuffer supported\n");
 
     GetLogger()->Info("CDevice created successfully\n");