perlinnois.gd

# perlin_noise_3d.gd
@tool
extends VisualShaderNodeCustom
class_name VisualShaderNodePerlinNoise3D


func _get_name():
	return "PerlinNoise3D"


func _get_category():
	return "MyShaderNodes"


func _get_description():
	return "Classic Perlin-Noise-3D function (by Curly-Brace)"


func _init():
	set_input_port_default_value(2, 0.0)


func _get_return_icon_type():
	return VisualShaderNode.PORT_TYPE_SCALAR


func _get_input_port_count():
	return 4


func _get_input_port_name(port):
	match port:
		0:
			return "uv"
		1:
			return "offset"
		2:
			return "scale"
		3:
			return "time"


func _get_input_port_type(port):
	match port:
		0:
			return VisualShaderNode.PORT_TYPE_VECTOR_3D
		1:
			return VisualShaderNode.PORT_TYPE_VECTOR_3D
		2:
			return VisualShaderNode.PORT_TYPE_SCALAR
		3:
			return VisualShaderNode.PORT_TYPE_SCALAR


func _get_output_port_count():
	return 1


func _get_output_port_name(port):
	return "result"


func _get_output_port_type(port):
	return VisualShaderNode.PORT_TYPE_SCALAR


func _get_global_code(mode):
	return """
		vec3 mod289_3(vec3 x) {
			return x - floor(x * (1.0 / 289.0)) * 289.0;
		}

		vec4 mod289_4(vec4 x) {
			return x - floor(x * (1.0 / 289.0)) * 289.0;
		}

		vec4 permute(vec4 x) {
			return mod289_4(((x * 34.0) + 1.0) * x);
		}

		vec4 taylorInvSqrt(vec4 r) {
			return 1.79284291400159 - 0.85373472095314 * r;
		}

		vec3 fade(vec3 t) {
			return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
		}

		// Classic Perlin noise.
		float cnoise(vec3 P) {
			vec3 Pi0 = floor(P); // Integer part for indexing.
			vec3 Pi1 = Pi0 + vec3(1.0); // Integer part + 1.
			Pi0 = mod289_3(Pi0);
			Pi1 = mod289_3(Pi1);
			vec3 Pf0 = fract(P); // Fractional part for interpolation.
			vec3 Pf1 = Pf0 - vec3(1.0); // Fractional part - 1.0.
			vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
			vec4 iy = vec4(Pi0.yy, Pi1.yy);
			vec4 iz0 = vec4(Pi0.z);
			vec4 iz1 = vec4(Pi1.z);

			vec4 ixy = permute(permute(ix) + iy);
			vec4 ixy0 = permute(ixy + iz0);
			vec4 ixy1 = permute(ixy + iz1);

			vec4 gx0 = ixy0 * (1.0 / 7.0);
			vec4 gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
			gx0 = fract(gx0);
			vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
			vec4 sz0 = step(gz0, vec4(0.0));
			gx0 -= sz0 * (step(0.0, gx0) - 0.5);
			gy0 -= sz0 * (step(0.0, gy0) - 0.5);

			vec4 gx1 = ixy1 * (1.0 / 7.0);
			vec4 gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
			gx1 = fract(gx1);
			vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
			vec4 sz1 = step(gz1, vec4(0.0));
			gx1 -= sz1 * (step(0.0, gx1) - 0.5);
			gy1 -= sz1 * (step(0.0, gy1) - 0.5);

			vec3 g000 = vec3(gx0.x, gy0.x, gz0.x);
			vec3 g100 = vec3(gx0.y, gy0.y, gz0.y);
			vec3 g010 = vec3(gx0.z, gy0.z, gz0.z);
			vec3 g110 = vec3(gx0.w, gy0.w, gz0.w);
			vec3 g001 = vec3(gx1.x, gy1.x, gz1.x);
			vec3 g101 = vec3(gx1.y, gy1.y, gz1.y);
			vec3 g011 = vec3(gx1.z, gy1.z, gz1.z);
			vec3 g111 = vec3(gx1.w, gy1.w, gz1.w);

			vec4 norm0 = taylorInvSqrt(vec4(dot(g000, g000), dot(g010, g010), dot(g100, g100), dot(g110, g110)));
			g000 *= norm0.x;
			g010 *= norm0.y;
			g100 *= norm0.z;
			g110 *= norm0.w;
			vec4 norm1 = taylorInvSqrt(vec4(dot(g001, g001), dot(g011, g011), dot(g101, g101), dot(g111, g111)));
			g001 *= norm1.x;
			g011 *= norm1.y;
			g101 *= norm1.z;
			g111 *= norm1.w;

			float n000 = dot(g000, Pf0);
			float n100 = dot(g100, vec3(Pf1.x, Pf0.yz));
			float n010 = dot(g010, vec3(Pf0.x, Pf1.y, Pf0.z));
			float n110 = dot(g110, vec3(Pf1.xy, Pf0.z));
			float n001 = dot(g001, vec3(Pf0.xy, Pf1.z));
			float n101 = dot(g101, vec3(Pf1.x, Pf0.y, Pf1.z));
			float n011 = dot(g011, vec3(Pf0.x, Pf1.yz));
			float n111 = dot(g111, Pf1);

			vec3 fade_xyz = fade(Pf0);
			vec4 n_z = mix(vec4(n000, n100, n010, n110), vec4(n001, n101, n011, n111), fade_xyz.z);
			vec2 n_yz = mix(n_z.xy, n_z.zw, fade_xyz.y);
			float n_xyz = mix(n_yz.x, n_yz.y, fade_xyz.x);
			return 2.2 * n_xyz;
		}
	"""


func _get_code(input_vars, output_vars, mode, type):
	return output_vars[0] + " = cnoise(vec3((%s.xy + %s.xy) * %s, %s)) * 0.5 + 0.5;" % [input_vars[0], input_vars[1], input_vars[2], input_vars[3]]