// imitation of the Unreal Engine 1.x ambient glow effect, timing may be off
#define PI 3.14159265
vec4 ProcessLight( vec4 color )
{
	float glow = (1.0+sin(timer*2*PI))*0.25;
	return vec4(min(color.rgb+vec3(glow),1.0),color.a);
}

// imitation of the Unreal Engine 1.x bMeshEnviroMap effect, not 1:1 but gets close
vec4 ProcessTexel()
{
	vec4 base = getTexel(vTexCoord.st);
	float mask = texture(masktex,vTexCoord.st).x;
	vec3 eyedir = normalize(uCameraPos.xyz-pixelpos.xyz);
	vec3 norm = reflect(eyedir,normalize(vWorldNormal.xyz));
	return vec4(base.rgb+texture(envtex,norm.xz*0.5).rgb*mask,base.a);
}