shader_type canvas_item;
render_mode blend_mix;
uniform int particles_anim_h_frames;
uniform int particles_anim_v_frames;
uniform bool particles_anim_loop;
void vertex() {
	float h_frames = float(particles_anim_h_frames);
	float v_frames = float(particles_anim_v_frames);
	VERTEX.xy /= vec2(h_frames, v_frames);
	float particle_total_frames = float(particles_anim_h_frames * particles_anim_v_frames);
	float particle_frame = floor(INSTANCE_CUSTOM.z * float(particle_total_frames));
	if (!particles_anim_loop) {
		particle_frame = clamp(particle_frame, 0.0, particle_total_frames - 1.0);
	} else {
		particle_frame = mod(particle_frame, particle_total_frames);
	}	UV /= vec2(h_frames, v_frames);
	UV += vec2(mod(particle_frame, h_frames) / h_frames, floor(particle_frame / h_frames) / v_frames);
}

void fragment() {
	float b = texture(TEXTURE, UV).w;
	float n = texture(NORMAL_TEXTURE, UV).w;
	if(b == 0f && n >= 1f) {
		//COLOR.xyz = vec3(1, 1, 1) - texture(SCREEN_TEXTURE, SCREEN_UV).xyz;
		COLOR = vec4(0, 0, 0, 0.9f);
	} else {
		COLOR = texture(TEXTURE, UV);
	}
}