Godot Basic Shader

/*
MIT License

Copyright (c) 2021 Amankumar "ACP" Chandubhai Parmar

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

shader_type spatial;
render_mode cull_disabled, specular_schlick_ggx;

uniform float rotation_point : hint_range(0, 1, 0.1) = 0.5;
uniform float rotation_degrees : hint_range(-360, 360, 1) = 0;

uniform float x_offset = 0;
uniform float y_offset = 0;

uniform float x_scale = 1;
uniform float y_scale = 1;

uniform float metalic : hint_range(0, 1, 0.01) = 0;
uniform float specular : hint_range(0, 1, 0.01) = 0;

uniform sampler2D texture_albedo : hint_albedo;
uniform float albedo_strength : hint_range(-2, 2, 0.1) = 0;

uniform sampler2D texture_roughness : hint_aniso;
uniform float roughness_strength : hint_range(-2, 2, 0.1) = 0;

uniform sampler2D texture_normal : hint_normal;
uniform float normal_strength : hint_range(-2, 2, 0.1) = 0;


void vertex() {
// Output:0

}

// Rotate UV
vec2 rotate(vec2 uv) {
    float x = ((uv.x - rotation_point) * cos(radians(rotation_degrees))) + ((uv.y - rotation_point) * sin(radians(rotation_degrees))) + rotation_point;
    float y = ((uv.y - rotation_point) * cos(radians(rotation_degrees))) - ((uv.x - rotation_point) * sin(radians(rotation_degrees))) + rotation_point;
    return vec2(x, y);
}

// Offset UV
vec2 offset(vec2 uv) {
    float x  = uv.x + x_offset;
    float y = uv.y + y_offset;
    return vec2(x, y);
}

// Scale UV
vec2 scale(vec2 uv) {
    float x = uv.x * x_scale;
    float y = uv.y * y_scale;
    return vec2(x, y);
}

void fragment() {
    vec2 uv = UV;

    // Apply rotation
    uv = rotate(uv);

    // Apply offset
    uv = offset(uv);

    // Apply scale
    uv = scale(uv);

    // Output:0
    METALLIC = metalic;
    SPECULAR = specular;

    ALBEDO = texture(texture_albedo, uv).rgb;
    ROUGHNESS = texture(texture_roughness, uv).r;

    vec4 tex = texture(texture_normal, uv);
    NORMALMAP = vec3(tex.r, 1.0 - tex.g, 0.0);
    NORMALMAP_DEPTH = tex.b + normal_strength;
}

void light() {
// Output:0

}