----- we do have alpha in base.a at this point

---- this is temporary color composed from color(base + bump, etc) and vertex color
	vec4 col = vec4(color.rgb * gl_Color.rgb, 1.0);

#if MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE
	float alpha = gl_Color.a;
	if (fogDistance != 0.0) {
		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
		alpha = mix(alpha, 0.0, d);
	}
-----	here alpha is replaced with fog one
	col = vec4(col.rgb, alpha);
#else
	if (fogDistance != 0.0) {
		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
		col = mix(col, skyBgColor, d);
	}
----- If theres no fog, texture alpha is being used
	col = vec4(col.rgb, base.a);
#endif


----- so here we do have proper alpha back
#ifdef ENABLE_TONE_MAPPING
	gl_FragColor = applyToneMapping(col);
#else
	gl_FragColor = col;
#endif