shader_type spatial;
render_mode blend_add,unshaded,depth_test_disabled;

uniform sampler2D tex_main : source_color;
uniform bool is_billboard;

void vertex() {
	if (is_billboard){
	    vec3 billboard_offset = VERTEX;
	    VERTEX.xz = normalize(INV_VIEW_MATRIX[0].xz) * billboard_offset.x + normalize(INV_VIEW_MATRIX[2].xz) * billboard_offset.z;
	    VERTEX.y = billboard_offset.y;
	}
}

void fragment() {
	vec4 col = texture(tex_main, UV);
	ALBEDO = COLOR.rgb * col.r;
	ALPHA = COLOR.a * col.r;
}