OpenGL: Print some information about the OpenGL implementation on error

src/C4GraphicsSystem.cpp

@@ -349,11 +349,6 @@ void C4GraphicsSystem::ClearFullscreenBackground()
 	--iRedrawBackground;
 }
 
-void OnSurfaceRestore()
-{
-	::GraphicsSystem.InvalidateBg();
-}
-
 bool C4GraphicsSystem::InitLoaderScreen(const char *szLoaderSpec, bool fDrawBlackScreenFirst)
 {
 	// create new loader; overwrite current only if successful

src/platform/StdDDraw2.h

@@ -330,7 +330,7 @@ protected:
 	virtual void PerformLine(SURFACE sfcTarget, float x1, float y1, float x2, float y2, DWORD dwClr) = 0;
 	bool CreatePrimaryClipper(unsigned int iXRes, unsigned int iYRes);
 	virtual bool CreatePrimarySurfaces(bool Fullscreen, unsigned int iXRes, unsigned int iYRes, int iColorDepth, unsigned int iMonitor) = 0;
-	bool Error(const char *szMsg);
+	virtual bool Error(const char *szMsg);
 	void DebugLog(const char *szMsg)
 	{
 #ifdef _DEBUG

src/platform/StdGL.cpp

@@ -1777,7 +1777,7 @@ bool CStdGL::RestoreDeviceObjects()
 	// BGRA Pixel Formats, Multitexturing, Texture Combine Environment Modes
 	if (!GLEW_VERSION_1_3)
 	{
-		return Error("  gl: OpenGL Version 1.3 or higher required.");
+		return Error("  gl: OpenGL Version 1.3 or higher required. A better graphics driver will probably help.");
 	}
 
 	// lines texture
@@ -1934,6 +1934,15 @@ void CStdGL::ResetTexture()
 	glDisable(GL_TEXTURE_2D);
 }
 
+bool CStdGL::Error(const char *szMsg)
+{
+	LogF("  gl: %s", glGetString(GL_VENDOR));
+	LogF("  gl: %s", glGetString(GL_RENDERER));
+	LogF("  gl: %s", glGetString(GL_VERSION));
+	LogF("  gl: %s", glGetString(GL_EXTENSIONS));
+	return CStdDDraw::Error(szMsg);
+}
+
 bool CStdGL::CheckGLError(const char *szAtOp)
 {
 	GLenum err = glGetError();

src/platform/StdGL.h

@@ -133,6 +133,7 @@ protected:
 	bool CreatePrimarySurfaces(bool Fullscreen, unsigned int iXRes, unsigned int iYRes, int iColorDepth, unsigned int iMonitor);
 
 	bool CheckGLError(const char *szAtOp);
+	virtual bool Error(const char *szMsg);
 #ifdef USE_X11
 	// Size of gamma ramps
 	int gammasize;