import msp_interface;
import common;

struct UnlitMaterialParameters
{
	vec4 color;
};

layout(set=1) uniform UnlitMaterial
{
	UnlitMaterialParameters unlit_material;
	float alpha_cutoff;
};

layout(set=1) uniform sampler2D color_tex;

layout(constant_id=auto) const bool use_texture = false;
layout(constant_id=auto) const bool use_vertex_color = false;
layout(constant_id=auto) const bool use_fog = false;
layout(constant_id=auto) const bool use_alpha_cutoff = false;

#pragma MSP stage(fragment)
virtual vec4 get_color()
{
	vec4 result = unlit_material.color;
	if(use_texture)
		result *= texture(color_tex, texcoord.xy);
	if(use_vertex_color)
		result *= color;
	return result;
}

void main()
{
	vec4 color = get_color();
	if(use_alpha_cutoff && color.a<alpha_cutoff)
		discard;

	if(use_fog)
		color.rgb = apply_fog(color.rgb);
	frag_color = color;
}