From ff4190b4e1c93f256f57acee977930cdc8899b46 Mon Sep 17 00:00:00 2001
From: Injazz <43905364+Injazz@users.noreply.github.com>
Date: Sun, 23 Jun 2019 16:44:39 +0500
Subject: [PATCH] makes shaders round (#263)

---
 Resources/Shaders/circlemask.swsl         | 24 ++++++++++++---------
 Resources/Shaders/gradientcirclemask.swsl | 26 +++++++++++++++++------
 2 files changed, 34 insertions(+), 16 deletions(-)

diff --git a/Resources/Shaders/circlemask.swsl b/Resources/Shaders/circlemask.swsl
index fa47a61fcb..c8471ec2d0 100644
--- a/Resources/Shaders/circlemask.swsl
+++ b/Resources/Shaders/circlemask.swsl
@@ -1,13 +1,17 @@
-float circle(in vec2 _st, in float _radius){
-    vec2 dist = _st-vec2(0.5);
-	return smoothstep(_radius-(_radius*0.01),
-                         _radius+(_radius*0.01),
-                         dot(dist,dist)*4.0);
+vec4 circle(in vec2 uv, in vec2 pos, float rad, in vec3 color) {
+    float d = length(pos - uv) - rad;
+    float t = clamp(d, 0.0, 1.0);
+    return vec4(color, t);
 }
-
 void fragment(){
-	vec2 st = FRAGCOORD.xy*SCREEN_PIXEL_SIZE.xy;
+	vec2 uv = FRAGCOORD.xy;
+    vec2 res_xy = vec2(1.0/SCREEN_PIXEL_SIZE.x, 1.0/SCREEN_PIXEL_SIZE.y);
+    vec2 center = res_xy*0.5;
+    float radius = 0.05 * res_xy.y;
 
-	COLOR.rgb = vec3(0);
-    COLOR.a = circle(st,0.05);
-}
+    vec4 layer1 = vec4(vec3(0), 0.0);
+    
+    vec4 layer2 = circle(uv, center, radius, vec3(0));
+
+    COLOR = mix(layer1, layer2, layer2.a);
+}
\ No newline at end of file
diff --git a/Resources/Shaders/gradientcirclemask.swsl b/Resources/Shaders/gradientcirclemask.swsl
index 382d8b164c..8eee20fd4c 100644
--- a/Resources/Shaders/gradientcirclemask.swsl
+++ b/Resources/Shaders/gradientcirclemask.swsl
@@ -1,9 +1,23 @@
-uniform float percentagedistanceshow = 0.1;
-uniform float gradientfalloffwidth = 0.2;
+uniform float percentagedistanceshow = 0.05;
+uniform float gradientfalloffwidth = 3.0;
+
+vec4 circle(in vec2 uv, in vec2 pos, float rad, in vec3 color) {
+    float d = length(pos - uv) - rad;
+    float t = clamp(d, 0.0, 1.0);
+    return vec4(color, t);
+}
 
 void fragment() {
-    float dist = distance(UV, vec2(0.5, 0.5));
-    float fromdiskdist = dist - percentagedistanceshow;
-    COLOR.a = max(0, min(1.0, 2.0*dist/percentagedistanceshow - 2.0));
-    COLOR.rgb = vec3(1,1,1) - vec3(fromdiskdist,fromdiskdist,fromdiskdist)/gradientfalloffwidth;
+    vec2 uv = FRAGCOORD.xy;
+    vec2 res_xy = vec2(1.0/SCREEN_PIXEL_SIZE.x, 1.0/SCREEN_PIXEL_SIZE.y);
+    vec2 center = res_xy*0.5;
+    float radius = percentagedistanceshow * res_xy.y;
+
+    vec4 grad = vec4(0.8 - length( uv - center )/res_xy.y * gradientfalloffwidth);
+
+    vec4 layer1 = vec4(vec3(255.0),0.0);
+    
+    vec4 layer2 = circle(uv, center, radius, grad.rgb);
+
+    COLOR = mix(layer1, layer2, layer2.a);
 }