Merge pull request #12 from Mikeysax/main

Added shapes, uv_grid, uv_rotate, fresnel, and fresnel_glow functions

Author: paddy-exe

README.md

@@ -17,7 +17,7 @@
 This project aims to help Godot developers writing custom written shaders by providing high-level functions which are often used.
 
 ## :tada: Using the addon
-Download the source (releases and AssetLib version are still WIP) and put the `ShaderFunction-Extras` inside 
+Download the source (releases and AssetLib version are still WIP) and put the `ShaderFunction-Extras` inside
 your `addons` folder. If you don't have one, create it or put the whole addons folder inside your project directory.
 
 ## 🔢 Versioning
@@ -73,19 +73,32 @@ All these shader functions are based on publicly available shader functions (ope
   * `proximity_fade_*`
   * `random_range`
   * `remap`
+  * `fresnel`
+  * `fresnel_glow`
 
   ### UV
   * `uv_panning`
   * `uv_scaling`
+  * `uv_rotate`
   * `uv_polar_coord_*`
   * `uv_flipbook`
   * `uv_twirl`
+  * `uv_grid_tiler`
 
   ### Wave
   * `sawtooth_wave`
   * `sine_wave`
   * `sine_wave_angular`
   * `square_wave`
   * `triangle_wave`
-  
+
+  ### Shapes
+  * `polygon`
+  * `circle`
+  * `square`
+  * `square_stroke`
+  * `square_rounded`
+  * `swirl`
+  * `line`
+
 </details>

addons/ShaderFunction-Extras/Shapes/LicenseInfo.md

@@ -0,0 +1,28 @@
+# License Information
+
+## shapes.gdshaderinc
+```md
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* 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.                 */
+/**************************************************************************/
+```

addons/ShaderFunction-Extras/Shapes/shapes.gdshaderinc

@@ -0,0 +1,51 @@
+float polygon(vec2 uv, float width, int sides) {
+	uv = uv * 2.0 - 1.0;
+	float angle = atan(uv.x, uv.y);
+	float radius = 6.28318530718 / float(sides);
+	float dist = cos(floor(0.5 + angle / radius) * radius - angle) * length(uv);
+	return step(width, dist);
+}
+
+float circle(vec2 uv, float radius, float feather) {
+	return smoothstep(radius, radius + feather, dot(position, position) * 4.0);
+}
+
+float square(vec2 uv, float width) {
+	uv = uv * 2.0 - 1.0;
+	vec2 abs_uv = abs(uv.xy);
+	return step(width, max(abs_uv.x, abs_uv.y));
+}
+
+float square_stroke(vec2 uv, float width, float stroke_width) {
+	uv = uv * 2.0 - 1.0;
+	vec2 abs_uv = abs(uv.xy);
+	float dist = max(abs_uv.x, abs_uv.y);
+	return 1.0 - (step(width, dist) - step(width + stroke_width, dist));
+}
+
+float square_rounded(vec2 uv, float width, float radius) {
+	uv = uv * 2.0 - 1.0;
+	radius *= width;
+	vec2 abs_uv = abs(uv.xy) - radius;
+	vec2 dist = vec2(max(abs_uv.xy, 0.0));
+	return step(width - radius, length(dist));
+}
+
+float swirl(vec2 uv, float size, int arms) {
+	float angle = atan(-uv.y + 0.5, uv.x - 0.5);
+	float len = length(uv - vec2(0.5, 0.5));
+	return sin(len * size + angle * float(arms));
+}
+
+float line(vec2 uv, vec2 p1, vec2 p2, float width) {
+	float dist = distance(p1, p2);
+	float dist_uv = distance(p1, uv);
+	return 1.0 - floor(1.0 - (0.001 * width) + distance (mix(p1, p2, clamp(dist_uv / dist, 0.0, 1.0)), uv));
+}
+
+float border(vec2 uv, float border_width) {
+	vec2 bottom_left = step(vec2(border_width), uv);
+	vec2 top_right = step(vec2(border_width), 1.0 - uv);
+	return bottom_left.x * bottom_left.y * top_right.x * top_right.y;
+}
+

addons/ShaderFunction-Extras/UV/uv.gdshaderinc

@@ -6,6 +6,14 @@ vec2 uv_scaling(vec2 uv, vec2 scale, vec2 pivot) {
 	return (uv - pivot) * scale + pivot;
 }
 
+vec2 uv_rotate(vec2 uv, vec2 pivot, float angle) {
+	mat2 rotation = mat2(vec2(sin(angle), -cos(angle)), vec2(cos(angle), sin(angle)));
+	uv -= pivot;
+	uv = uv * rotation;
+	uv += pivot;
+	return uv;
+}
+
 vec2 uv_polar_coord_canvas(vec2 uv, vec2 center, float zoom, float repeat) {
 	vec2 dir = uv - center;
 	float radius = length(dir) * 2.0;
@@ -24,17 +32,17 @@ vec2 uv_flipbook(vec2 uv, int columns, int rows, int starting_frame, int ending_
 	starting_frame += int(fract(TIME * anim_speed) * float(ending_frame));
 	float frame = float(clamp(starting_frame, 0, ending_frame));
 	vec2 offPerFrame = vec2((1.0 / float(columns)), (1.0 / float(rows)));
-	
+
 	vec2 sprite_size = vec2(uv.x / float(columns), uv.y / float(rows));
 	vec2 current_sprite = vec2(0.0, 1.0 - offPerFrame.y);
 	current_sprite.x += frame * offPerFrame.x;
 	float rowIndex;
 	float _mod = modf(frame / float(columns), rowIndex);
 	current_sprite.y -= rowIndex * offPerFrame.y;
 	current_sprite.x -= rowIndex * float(columns) * offPerFrame.x;
-	
+
 	vec2 sprite_uv = (sprite_size + current_sprite);
-	
+
 	return sprite_uv;
 }
 
@@ -45,3 +53,7 @@ vec2 uv_twirl(vec2 uv, vec2 center, float strength, vec2 offset) {
 	float __y = sin(__angle) * __delta.x + cos(__angle) * __delta.y;
 	return vec2(__x + center.x + offset.x, __y + center.y + offset.y);
 }
+
+vec2 uv_grid_tiler(vec2 uv, float columns, float rows) {
+	return fract(vec2(uv.x * columns, uv.y * rows));
+}

addons/ShaderFunction-Extras/Utility/utility.gdshaderinc

@@ -43,3 +43,11 @@ float remap(float value, float input_min, float input_max, float output_min, flo
 	float _output_range = output_max - output_min;
 	return output_min + _output_range * ((value - input_min) / _input_range);
 }
+
+float fresnel(float amount, vec3 normal, vec3 view) {
+	return pow((1.0 - clamp(dot(normalize(normal), normalize(view)), 0.0, 1.0 )), amount);
+}
+
+vec3 fresnel_glow(float amount, float intensity, vec3 color, vec3 normal, vec3 view) {
+	return pow((1.0 - dot(normalize(normal), normalize(view))), amount) * color * intensity;
+}