Lightning is not additive anymore

Now otclient lightning may look like more tibia lights,
before this too many lights together would increase
brightness a lot, this won't happen anymore in cards
with OpenGL 1.4 or newer

src/framework/graphics/graphics.cpp

@@ -357,6 +357,19 @@ bool Graphics::canUseBlendFuncSeparate()
 #endif
 }
 
+bool Graphics::canUseBlendEquation()
+{
+#if OPENGL_ES==2
+    return true;
+#elif OPENGL_ES==1
+    return true;
+#else
+    if(!GLEW_VERSION_1_4)
+        return false;
+    return true;
+#endif
+}
+
 bool Graphics::canCacheBackbuffer()
 {
     if(!m_alphaBits)