shader_type spatial;
render_mode specular_schlick_ggx, async_visible;

uniform sampler2D MapAlbedoTexture : hint_black_albedo;
uniform int TextureSize: hint_range(0, 1024, 4);
varying vec2 map_coord;
varying vec3 obj_coord;

const mat2 _HexAffineInverse = mat2(vec2(1.333333, -0.6666667), vec2(0, -1.154701));

vec3 axial_to_cube(vec2 axial) {
	return vec3(axial.x, axial.y, -axial.x - axial.y);
}

ivec3 round_cube_coords(vec3 cube) {
	ivec3 rounded = ivec3(round(cube));
	
	vec3 diffs = abs(vec3(rounded) - cube);
	
	if (diffs.x > diffs.y && diffs.x > diffs.z) {
		rounded.x = -rounded.y - rounded.z;
	} else if (diffs.y > diffs.z) {
		rounded.y = -rounded.x - rounded.z;
	} else {
		 rounded.z = -rounded.x - rounded.y;
	}
	
	return rounded;
}

vec2 axial_to_offset(vec2 axial) {
	ivec3 cubeCoords = round_cube_coords(axial_to_cube(axial));
    int x = cubeCoords.x;
    int y = cubeCoords.y;
    int off_y = y + (x - (x & 1)) / 2;
    return vec2(float(x), float(off_y));
}

void vertex() {
// Input:2
	mat4 model_matrix = WORLD_MATRIX;

	vec3 origin = vec4(WORLD_MATRIX * vec4(0, 0, 0, 1)).xyz;
	vec3 axial_coords = vec3(_HexAffineInverse * origin.xz, 0);

	vec2 offset_coords = axial_to_offset(axial_coords.xy);
	//map_coord = mod(axial_to_offset(axial_coords.xy), vec2(float(TextureSize)));
	map_coord = offset_coords;
	map_coord.y = -map_coord.y;
	
	
	float map_size = 4.0;
	map_coord = mod(origin.xz, map_size) / (map_size);
	//map_coord = mod((round(origin.xz * map_size)) / (map_size) , map_size);
	
//	if (map_coord.x > map_size) {
//		map_coord.x = map_coord.x - (map_size + 1.0);
//	}
	
//	map_coord.x = map_coord.x / map_size;
//	map_coord.x = (mod (map_coord.x, map_size) / (map_size + 1.0));
//	map_coord.y = (mod (map_coord.y, map_size) / (map_size + 1.0));
	
//	ivec2 map_coord_i = ivec2(map_coord);
//	map_coord_i.x = map_coord_i.x % TextureSize;
//	map_coord_i.y = map_coord_i.y % TextureSize;
//	map_coord = vec2(map_coord_i) / float(TextureSize);
	obj_coord = origin;
}

void fragment() {
	//ALBEDO = pow(texture(MapAlbedoTexture, map_coord).rgb, vec3(2.4));
	ALBEDO = texture(MapAlbedoTexture, map_coord).rgb;
}

void light() {
// Output:0

}