TouhouGD/render/shader/effect_billboard.gdshader

shader_type spatial;
render_mode blend_add,unshaded;

uniform sampler2D tex_main : source_color;
uniform vec2 sheet_size = vec2(1,1);

//void vertex() {
    //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 = mix(col.rgb, COLOR.rgb, COLOR.a);
	ALPHA = col.r;
}