// -*- mode: glsl -*-
shader_type spatial;
render_mode depth_prepass_alpha;

#define USE_MASK
#include "common.gdshaderinc"

void fragment() {
	vec3 uvt = scale_uvt(UV, TIME);
	float value = sample_noise(uvt);
	ALBEDO = base_albedo(UV, value);
	ROUGHNESS = base_roughness(value);
	EMISSION = base_emission(UV, value);
	SPECULAR = base_specular();

	// vec3 nmap = minimal_convolution(UV, uvt);
	// vec3 nmap = cross_convolution(UV, uvt);
	vec3 nmap = sobel_convolution(UV, uvt);
	// vec3 nmap = sobel_5x5_convolution(UV, uvt);
    // vec3 nmap = scharr_convolution(UV, uvt);
    // vec3 nmap = godot_convolution(UV, uvt);
	NORMAL_MAP = nmap / 2.0 + 0.5;

	// add fresnel
	vec3 world_normal = mat3(TANGENT, BINORMAL, NORMAL) * nmap;
	EMISSION += rim_glow(
		world_normal,
		VIEW,
		fresnel_gradient,
		fresnel_color,
		fresnel_power,
		fresnel_intensity
	);

	// add iridescence
	ALBEDO += rim_glow(
		world_normal,
		VIEW,
		iridescence_gradient,
		iridescence_color,
		iridescence_power,
		iridescence_intensity
	);

	// Hardish edge
	float mask = texture(gunk_mask, UV).r;
	ALPHA = hardstep(1.0 - mask + edge_bleed);
}