[gd_resource type="ShaderMaterial" load_steps=2 format=3 uid="uid://ck8h6dvojuegj"]

[sub_resource type="Shader" id="Shader_eumy4"]
code = "shader_type spatial;
render_mode blend_mix,depth_draw_opaque,cull_back,unshaded;
uniform sampler2D texture_albedo : filter_linear_mipmap_anisotropic,repeat_enable;
uniform sampler2DArray lightmap_albedo : filter_linear_mipmap_anisotropic,repeat_enable;
uniform bool lightmap_2x;
uniform ivec2 lightmap_bitmask;

float srgb_to_linear_e(float input) {
	float output;
	if (input <= 0.04045) {
		output = input / 12.92;
	} 
	else {
		output = pow((input + 0.055) / 1.055, 2.4);
	}
	return output;
}

vec3 srgb_to_linear(vec3 input) {
	vec3 output;
	output.r = srgb_to_linear_e(input.r);
    output.g = srgb_to_linear_e(input.g);
    output.b = srgb_to_linear_e(input.b);
	return output;
}

void fragment() {
	vec4 albedo_tex = texture(texture_albedo,UV);
	if (lightmap_bitmask.x == 0 && lightmap_bitmask.y == 0) {
		ALBEDO = srgb_to_linear(albedo_tex.rgb);
	} else {
		vec4 lightmap_tex = vec4(0.0);
		int mask = lightmap_bitmask.x;
		for (int i = 0; i < 33; i++) {
			if (i == 32) {
				mask = lightmap_bitmask.y;
			}
			bool layer_enabled = (mask & (1 << (i % 32))) != 0;
			if (layer_enabled) {
				lightmap_tex += texture(lightmap_albedo, vec3(UV2, float(i)));
			}
		}
		lightmap_tex = min(vec4(1.0), lightmap_tex);
		
		if (lightmap_2x) {
			lightmap_tex *= 2.0f;
		}
		ALBEDO = srgb_to_linear((albedo_tex * lightmap_tex).rgb);
	}
}
"

[resource]
render_priority = 0
shader = SubResource("Shader_eumy4")
shader_parameter/lightmap_2x = null
shader_parameter/lightmap_bitmask = null