graphics fixes and improvements

src/framework/platform/win32window.cpp

@@ -319,7 +319,6 @@ void WIN32Window::internalChooseGLVisual()
     if(!pixelFormat)
         g_logger.fatal("Could not find a suitable pixel format");
 
-    pfd.cStencilBits = 8;
     if(!SetPixelFormat(m_deviceContext, pixelFormat, &pfd))
         g_logger.fatal("Could not set the pixel format");
 }

src/framework/platform/x11window.cpp

@@ -370,10 +370,10 @@ void X11Window::internalChooseGLVisual()
 #else
         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
 #endif
-        EGL_RED_SIZE, 4,
-        EGL_GREEN_SIZE, 4,
-        EGL_BLUE_SIZE, 4,
-        EGL_ALPHA_SIZE, 4,
+        EGL_RED_SIZE, 5,
+        EGL_GREEN_SIZE, 6,
+        EGL_BLUE_SIZE, 5,
+        EGL_ALPHA_SIZE, 0,
         EGL_NONE
     };