feat: implement water shader and environment for free mode arena

assets/models/arena/free_mode/level_water.gdshader

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+shader_type spatial;
+render_mode cull_disabled;
+
+uniform vec3 albedo : source_color;
+uniform vec3 albedo2 : source_color;
+uniform float metallic : hint_range(0.0, 1.0) = 0;
+uniform float roughness : hint_range(0.0, 1.0) = 0.02;
+uniform sampler2D wave;
+uniform sampler2D texture_normal;
+uniform sampler2D texture_normal2;
+uniform vec2 wave_direction = vec2(2.0,0.0); // Direction of wave 1
+uniform vec2 wave_direction2 = vec2(0.0,1.0); // Direction of wave 2
+uniform float time_scale : hint_range(0.0, 0.2, 0.005) = 0.025; // Rate of movement multiplied by TIME
+uniform float noise_scale = 10.0;
+uniform float height_scale = 0.15;
+
+uniform vec4 color_deep : source_color; // Deep depth color
+uniform vec4 color_shallow : source_color; // Shallow depth color
+uniform float beers_law = 2.0; // Beer's law application
+uniform float depth_offset = -0.75; // Offset
+
+uniform float edge_scale = 0.1;
+uniform float near = 1.0;
+uniform float far = 100.0;
+uniform vec3 edge_color : source_color;
+uniform sampler2D DEPTH_TEXTURE : hint_depth_texture, filter_linear_mipmap;
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
+
+// Varying variables
+varying float height;
+varying vec3 world_pos;
+
+float fresnel(float amount, vec3 normal, vec3 view)
+{
+	return pow((1.0 - clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0 )), amount);
+}
+float edge(float depth){
+	depth = 2.0 * depth - 1.0;
+	return near * far / (far + depth * (near - far));
+}
+
+void vertex() {
+	world_pos = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+	height = texture(wave, world_pos.xz / noise_scale + TIME * time_scale).r;
+	VERTEX.y += height * height_scale;
+}
+
+void fragment() {
+	// Depth variables and calc
+	float depth_texture = texture(DEPTH_TEXTURE, SCREEN_UV).r * 2.0 - 1.0;
+	float depth = PROJECTION_MATRIX[3][2] / (depth_texture + PROJECTION_MATRIX[2][2]);
+	float depth_blend = exp((depth+VERTEX.z + depth_offset) * -beers_law);
+	depth_blend = clamp(1.0 - depth_blend, 0.0, 1.0);
+	float depth_blend_power = clamp(pow(depth_blend, 2.5), 0.0, 1.0);
+
+	// Retrieving depth color and applying the deep and shallow colors
+	vec3 screen_color = textureLod(SCREEN_TEXTURE, SCREEN_UV, depth_blend_power * 2.5).rgb;
+	vec3 depth_color = mix(color_shallow.rgb, color_deep.rgb, depth_blend_power);
+	vec3 color = mix(screen_color * depth_color, depth_color * 0.25, depth_blend_power * 0.5);
+
+	// Getting edge depth calc
+	float z_depth = edge(texture(DEPTH_TEXTURE, SCREEN_UV).x);
+	float z_pos = edge(FRAGCOORD.z);
+	float z_dif = z_depth - z_pos;
+
+	// Time calculations for wave (normal map) movement
+	vec2 time = (TIME * wave_direction) * time_scale; // Movement rate of first wave
+	vec2 time2 = (TIME * wave_direction2) * time_scale; // Movement rate of second wave
+
+	// Blend normal maps into one
+	vec3 normal_blend = mix(texture(texture_normal,world_pos.xz + time).rgb, texture(texture_normal2,world_pos.xz + time2).rgb, 0.5);
+
+	// Calculate Fresnel
+	float fresnel = fresnel(5.0, NORMAL, VIEW);
+	vec3 surface_color = mix(albedo, albedo2, fresnel); // Interpolate albedo values by frensel
+
+	vec3 depth_color_adj = mix(edge_color, color, step(edge_scale, z_dif));
+
+	ALBEDO = clamp(surface_color + depth_color_adj,vec3(0.0),vec3(1.0));
+	METALLIC = metallic;
+	ROUGHNESS = roughness;
+	NORMAL_MAP = normal_blend;
+}

assets/models/arena/free_mode/level_water.gdshader.uid

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+uid://chabrdico7377

assets/models/arena/free_mode/level_water.tres

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+[gd_resource type="PanoramaSkyMaterial" format=3 uid="uid://bdwxlbar41mxw"]
+
+[ext_resource type="Texture2D" uid="uid://didk5l287jms7" path="res://assets/levels/level_water/sky_sea_01.png" id="1_f0k4a"]
+
+[resource]
+panorama = ExtResource("1_f0k4a")

assets/models/arena/free_mode/level_water_environment.tres

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+[gd_resource type="Environment" format=3 uid="uid://d07fd5dsr0xv"]
+
+[ext_resource type="Material" uid="uid://bdwxlbar41mxw" path="res://assets/levels/level_water/level_water.tres" id="1_gsk4i"]
+
+[sub_resource type="Sky" id="Sky_u7obs"]
+sky_material = ExtResource("1_gsk4i")
+
+[resource]
+background_mode = 2
+sky = SubResource("Sky_u7obs")
+ambient_light_source = 3
+ambient_light_color = Color(1, 1, 1, 1)
+reflected_light_source = 2

assets/models/arena/free_mode/sky_sea_01.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dep1ng3aqb2jw"
+path.s3tc="res://.godot/imported/sky_sea_01.png-02f4e2484e4bcee94a60ae25a0ef8549.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/models/arena/free_mode/sky_sea_01.png"
+dest_files=["res://.godot/imported/sky_sea_01.png-02f4e2484e4bcee94a60ae25a0ef8549.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

assets/models/arena/free_mode/water_shader.tres

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+[gd_resource type="ShaderMaterial" format=3 uid="uid://xifgjdr8285d"]
+
+[ext_resource type="Shader" uid="uid://chabrdico7377" path="res://assets/models/arena/free_mode/level_water.gdshader" id="1_nuaxy"]
+
+[sub_resource type="FastNoiseLite" id="FastNoiseLite_s0tpp"]
+noise_type = 0
+seed = 5
+frequency = 0.0166
+metadata/_preview_in_3d_space_ = true
+
+[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_6vard"]
+noise = SubResource("FastNoiseLite_s0tpp")
+seamless = true
+as_normal_map = true
+seamless_blend_skirt = 1.0
+bump_strength = 25.6
+
+[resource]
+render_priority = 0
+shader = ExtResource("1_nuaxy")
+shader_parameter/albedo = Color(0.14, 0.382667, 0.7, 1)
+shader_parameter/albedo2 = Color(0.54, 0.77, 1, 1)
+shader_parameter/metallic = 0.0
+shader_parameter/roughness = 0.02
+shader_parameter/texture_normal = SubResource("NoiseTexture2D_6vard")
+shader_parameter/wave_direction = Vector2(2, 0)
+shader_parameter/wave_direction2 = Vector2(0, 1)
+shader_parameter/time_scale = 0.025
+shader_parameter/noise_scale = 10.0
+shader_parameter/height_scale = 0.15
+shader_parameter/color_deep = Color(0.513233, 0.513233, 0.513233, 1)
+shader_parameter/color_shallow = Color(0.716296, 0.716296, 0.716296, 1)
+shader_parameter/beers_law = 2.0
+shader_parameter/depth_offset = -0.75
+shader_parameter/edge_scale = 0.1
+shader_parameter/near = 1.0
+shader_parameter/far = 100.0
+shader_parameter/edge_color = Color(0.215902, 0.215902, 0.215902, 1)