175: {
176: 	int m_c00 = int((texture2D(m_mask_01_tex, uv.xy).r * 255.0));
177: 	int m_c01 = int((texture2D(m_mask_02_tex, uv.xy).r * 255.0));
178: 	int m_c02 = int((texture2D(m_mask_03_tex, uv.xy).r * 255.0));
179: 	int m_c03 = int((texture2D(m_mask_04_tex, uv.xy).r * 255.0));
180: 	int m_final = max((((m_c00 & m_c01) & m_c02) & m_c03), 0);
181: 	m_final = min(m_final, 255);
182: 	color.rgb = vec3(float(m_final));
183: }