refactor: update the sky shaders

Author: florianvazelle

.reuse/dep5

@@ -24,11 +24,6 @@ Copyright: 2023-present Hugo Locurcio and contributors
 License: MIT
 Source: https://github.com/godot-extended-libraries/godot-debug-menu
 
-Files: addons/gpsx/*
-Copyright: 2021 Uneven Prankster
-License: MIT
-Source: https://github.com/GithubPrankster/gpsx
-
 Files: addons/goat/*
 Copyright: 2019-2020 Miskatonic Studio
 License: MIT
@@ -156,9 +151,13 @@ Copyright: 2010 qubodup
 License: CC0-1.0
 Source: https://opengameart.org/content/door-open-door-close-set
 
-
 # Shaders
 
+Files: shaders/panoramic_textured_sky_with_clouds.gdshader
+Copyright: 2023 Gyrth
+License: CC0-1.0
+Source: https://godotshaders.com/shader/panoramic-textured-sky-with-clouds/
+
 Files: shaders/psx_model.gdshader
 Copyright: 2023 Grau
 License: CC0-1.0

plug.gd

@@ -11,12 +11,6 @@ func _plugging():
 			"include": ["addons/goat/images"]
 		}
 	)
-	plug("GithubPrankster/gpsx", {
-			"commit": "64b1c5f83daa4df3c714a65a8fd2f1294575dce3",
-			"install_root": "addons/gpsx",
-			"include": ["example/materials/shaders"]
-		}
-	)
 	plug("samclee/EZ-Sfx-and-Music", {"commit": "ac2b77c0336ff6edf6b26aa9342628d2ad63f359"})
 	plug("HolonProduction/godot_kanban_tasks", {
 		"commit": "cfc914caa1dabd085024ff196bcb8578eaee1e67",

resources/fog_env.tres

@@ -1,14 +1,36 @@
-[gd_resource type="Environment" load_steps=5 format=3 uid="uid://dtgnbg8pmfbjy"]
+[gd_resource type="Environment" load_steps=7 format=3 uid="uid://dtgnbg8pmfbjy"]
 
-[ext_resource type="Shader" path="res://addons/gpsx/example/materials/shaders/misc/gpsx_sky.gdshader" id="1_g6wkn"]
-[ext_resource type="Texture2D" uid="uid://dxmmrih8af3qb" path="res://assets/textures/nightsky.hdr" id="2_6xap7"]
+[ext_resource type="Shader" path="res://shaders/panoramic_textured_sky_with_clouds.gdshader" id="1_akepw"]
+[ext_resource type="Texture2D" uid="uid://dxmmrih8af3qb" path="res://assets/textures/nightsky.hdr" id="2_711um"]
+
+[sub_resource type="FastNoiseLite" id="FastNoiseLite_vqi2a"]
+noise_type = 4
+frequency = 0.05
+fractal_type = 3
+fractal_gain = 0.0
+
+[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_l5wex"]
+width = 128
+height = 128
+generate_mipmaps = false
+seamless = true
+noise = SubResource("FastNoiseLite_vqi2a")
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_mvojt"]
-shader = ExtResource("1_g6wkn")
-shader_parameter/mixer = Color(0.290196, 0.282353, 1, 1)
-shader_parameter/tex = ExtResource("2_6xap7")
-shader_parameter/dithering = true
-shader_parameter/banding = true
+shader = ExtResource("1_akepw")
+shader_parameter/add_clouds = true
+shader_parameter/clouds_below = false
+shader_parameter/cloud_scale = 0.25
+shader_parameter/speed = 0.002
+shader_parameter/cloud_dark = 0.5
+shader_parameter/cloud_light = 0.3
+shader_parameter/cloud_cover = 0.2
+shader_parameter/cloud_alpha = 8.0
+shader_parameter/sky_tint = 0.5
+shader_parameter/height_offset = 0.0
+shader_parameter/sky_contribution = 0.5
+shader_parameter/source_panorama = ExtResource("2_711um")
+shader_parameter/noise_texture = SubResource("NoiseTexture2D_l5wex")
 
 [sub_resource type="Sky" id="Sky_85p4l"]
 sky_material = SubResource("ShaderMaterial_mvojt")
@@ -19,11 +41,11 @@ sky = SubResource("Sky_85p4l")
 ambient_light_source = 3
 ambient_light_color = Color(0.388235, 0, 0.392157, 1)
 ambient_light_energy = 16.0
-tonemap_mode = 2
 glow_intensity = 2.0
 glow_bloom = 1.0
 fog_enabled = true
 fog_light_color = Color(0.0117647, 0, 0.239216, 1)
 fog_light_energy = 0.5
+fog_sky_affect = 0.75
 volumetric_fog_emission = Color(0.0352941, 0.0352941, 0.0352941, 1)
 volumetric_fog_sky_affect = 0.3

shaders/panoramic_textured_sky_with_clouds.gdshader

@@ -0,0 +1,109 @@
+shader_type sky;
+
+render_mode use_half_res_pass;
+
+uniform sampler2D source_panorama : filter_linear,
+                                    source_color,
+                                    hint_default_black;
+uniform bool add_clouds = true;
+uniform bool clouds_below = false;
+uniform float cloud_scale : hint_range(0.0, 1.0, 0.01) = 0.25;
+uniform float speed : hint_range(0.0, 0.25, 0.001) = 0.002;
+uniform float cloud_dark : hint_range(0.0, 1.0, 0.01) = 0.5;
+uniform float cloud_light : hint_range(0.0, 1.0, 0.01) = 0.3;
+uniform float cloud_cover : hint_range(0.0, 1.0, 0.01) = 0.2;
+uniform float cloud_alpha : hint_range(0.0, 10.0, 0.01) = 8.0;
+uniform float sky_tint : hint_range(0.0, 1.0, 0.001) = 0.5;
+uniform float height_offset : hint_range(0.0, 1.0, 0.001) = 0.2;
+uniform float sky_contribution : hint_range(0.0, 1.0, 0.1) = 0.5;
+uniform sampler2D noise_texture : filter_linear,
+                                  source_color,
+                                  hint_default_black;
+
+const mat2 m = mat2(vec2(1.6, 1.2), vec2(-1.2, 1.6));
+
+vec2 hash(vec2 p) {
+  p = vec2(dot(p, vec2(127.1, 311.7)), dot(p, vec2(269.5, 183.3)));
+  return -1.0 + 2.0 * fract(sin(p) * 43758.5453123);
+}
+
+float noise(in vec2 p) { return texture(noise_texture, p).r; }
+
+float fbm(vec2 n) {
+  float total = 0.0, amplitude = 0.1;
+  total += noise(n) * amplitude;
+  n = m * n;
+  amplitude *= 0.4;
+  return total;
+}
+
+void sky() {
+  COLOR = texture(source_panorama, SKY_COORDS).rgb;
+  if (AT_CUBEMAP_PASS) {
+    COLOR *= sky_contribution;
+  } else if (add_clouds) {
+    vec3 normal = normalize(EYEDIR);
+    vec3 plane_intersect = normal / (normal.y + height_offset);
+
+    if (clouds_below) {
+      plane_intersect = normal / -(normal.y - height_offset);
+    }
+
+    vec2 p = plane_intersect.xz;
+    p.y *= -1.0;
+    vec2 uv = p;
+
+    float time = TIME * speed;
+    float q = fbm(uv * cloud_scale * 0.5);
+
+    // ridged noise shape
+    float r = 0.0;
+    uv *= cloud_scale;
+    uv -= q - time;
+    float weight = 0.8;
+    r += abs(weight * noise(uv));
+    uv = m * uv + time;
+    weight *= 0.7;
+
+    // noise shape
+    float f = 0.0;
+    uv = p;
+    uv *= cloud_scale;
+    uv -= q - time;
+    weight = 0.7;
+    f += weight * noise(uv);
+    uv = m * uv + time;
+    weight *= 0.6;
+
+    f *= r + f;
+
+    // noise colour
+    float c = 0.0;
+    time = TIME * speed * 2.0;
+    uv = p;
+    uv *= cloud_scale * 2.0;
+    uv -= q - time;
+    weight = 0.4;
+    c += weight * noise(uv);
+    uv = m * uv + time;
+    weight *= 0.6;
+
+    vec3 skycolour = COLOR;
+    vec3 cloudcolour =
+        vec3(1.1, 1.1, 0.9) * clamp((cloud_dark + cloud_light * c), 0.0, 1.0);
+    float horizon_fall_off = max(normal.y, 0.0);
+
+    if (clouds_below) {
+      horizon_fall_off = max(-normal.y, 0.0);
+    }
+
+    f = cloud_cover + cloud_alpha * f * r;
+
+    vec3 result =
+        mix(skycolour, clamp(sky_tint * skycolour + cloudcolour, 0.0, 1.0),
+            clamp(f + c, 0.0, 1.0) * horizon_fall_off);
+
+    // Convert the color to black and white.
+    COLOR = vec3((result.r + result.g + result.b) / 3.0);
+  }
+}