workaround for older ati drivers

Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

@@ -450,6 +450,11 @@ Renderer::Renderer()
 	glScissor(0, 0, GetTargetWidth(), GetTargetHeight());
 	glBlendColor(0, 0, 0, 0.5f);
 	glClearDepth(1.0f);
+	
+	// this is a hack to work around an ati driver issue.
+	// usually this shouldn't be needed (and isn't allowed in core)
+	// but else glGenerateMipmaps wouldn't work always
+	glEnable(GL_TEXTURE_2D);
 
 	UpdateActiveConfig();