from_kenney_simple_minimalist.shader

shader_type spatial;
render_mode specular_schlick_ggx, world_vertex_coords;

uniform sampler2D img : hint_albedo;
uniform vec4 base_color : hint_color;
uniform vec4 top_color : hint_color;
uniform vec4 right_color : hint_color;
uniform vec4 front_color : hint_color;
uniform float intensity : hint_range(0.0, 1.0) = 0.1;
varying vec3 true_normal;

vec4 blendAwithBFunc(vec4 c1, vec4 c2, float f) {
	return mix(c1, c2, c2.a * f);
}

void vertex() {
	true_normal = NORMAL;
}

void fragment() {
	vec4 n_tex_read = texture(img, UV.xy);
	vec3 n_x = vec3(true_normal.x) * vec3(true_normal.x);
	vec3 n_y = vec3(true_normal.y) * vec3(true_normal.y);
	vec3 n_z = vec3(true_normal.z) * vec3(true_normal.z);
	vec3 n_out = vec3(
		dot(n_x, vec3(0.333333, 0.333333, 0.333333)),
		dot(n_y, vec3(0.333333, 0.333333, 0.333333)),
		dot(n_z, vec3(0.333333, 0.333333, 0.333333))
	);
	vec3 temp_output = (base_color.rgb * top_color.rgb);
	vec3 c1 = (mix(mix(mix(temp_output, (base_color.rgb * right_color.rgb), n_out.x), temp_output ,n_out.y), (base_color.rgb * front_color.rgb), n_out.z));
	vec3 final_color = blendAwithBFunc(vec4(n_tex_read.rgb * base_color.rgb, 1.0), vec4(c1, 1.0), intensity).rgb;
	ALBEDO = final_color;
}