import postprocess;

uniform sampler2DArray grain;
uniform GrainParams
{
	float coarseness;
	float strength;
};
uniform int grain_layer;

#pragma MSP stage(fragment)
void main()
{
	vec3 gcoord = vec3(gl_FragCoord.xy/textureSize(grain, 0).xy/coarseness, grain_layer);
	vec4 incoming = texture(source, texcoord);
	frag_color = vec4(incoming.rgb*mix(1.0, texture(grain, gcoord).r, strength), incoming.a);
}