From 5125d915095bd247d967ec704a5930a56cf851f6 Mon Sep 17 00:00:00 2001
From: Richard Davey <rich@photonstorm.com>
Date: Wed, 15 Feb 2023 18:50:47 +0000
Subject: [PATCH] Create FXCircle.frag

---
 src/renderer/webgl/shaders/src/FXCircle.frag | 80 ++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/renderer/webgl/shaders/src/FXCircle.frag

diff --git a/src/renderer/webgl/shaders/src/FXCircle.frag b/src/renderer/webgl/shaders/src/FXCircle.frag
new file mode 100644
index 000000000..61cee201b
--- /dev/null
+++ b/src/renderer/webgl/shaders/src/FXCircle.frag
@@ -0,0 +1,80 @@
+#define SHADER_NAME CIRCLE_FS
+
+precision mediump float;
+
+uniform sampler2D uMainSampler;
+
+uniform vec2 resolution;
+uniform vec3 color;
+uniform vec4 backgroundColor;
+uniform float width;
+
+// uniform float radius;
+// uniform vec2 position;
+// uniform vec4 borderColor;
+// uniform float borderThickness;
+
+varying vec2 outTexCoord;
+
+float circle (in vec2 _st, in float _radius)
+{
+    vec2 dist = _st - vec2(0.5);
+
+	return 1.0 - smoothstep(_radius - (_radius * 0.01), _radius + (_radius * 0.01), dot(dist, dist) * 4.0);
+}
+
+void main ()
+{
+    vec4 texture = texture2D(uMainSampler, outTexCoord);
+
+    float a = min(resolution.x, resolution.y);
+	vec2 st = gl_FragCoord.xy / vec2(a, a);
+
+	// vec2 st = gl_FragCoord.xy / resolution.xy;
+
+	vec3 color = vec3(circle(st, 0.5));
+
+	gl_FragColor = vec4(color, 1.0);
+
+
+
+    // float radius = 128.0;
+
+    // vec2 position = vec2(400.0, 300.0);
+    // vec4 baseColor = vec4(0.0, 1.0, 0.0, 1.0);
+    // vec4 borderColor = vec4(1.0, 0.0, 0.0, 1.0);
+    // float borderThickness = 16.0;
+
+    // vec2 tc = vec2(outTexCoord.x - 0.5, outTexCoord.y - 0.5);
+    // vec2 uv = gl_FragCoord.xy - position;
+    // vec2 uv = tc.xy - position;
+
+    // float d = sqrt(dot(uv, uv));
+
+    // float t1 = 1.0 - smoothstep(radius - borderThickness, radius, d);
+    // float t2 = 1.0 - smoothstep(radius, radius + borderThickness, d);
+
+    // gl_FragColor = vec4(mix(color.rgb, baseColor.rgb, t1), t2);
+
+
+
+
+
+
+    /*
+    vec2 tc = vec2(outTexCoord.x - 0.5, outTexCoord.y - 0.5);
+
+    float grad = length(tc);
+
+    float circle = smoothstep(0.50, 0.49, grad);
+
+    //  0.005 = strength of the ring (0.5 = super soft, 0.05 = gentle, 0.005 = harsh)
+    float ring = circle - smoothstep(width, width - 0.005, grad);
+
+    texture = mix(backgroundColor * backgroundColor.a, texture, texture.a);
+
+    texture = (texture * (circle - ring));
+
+    gl_FragColor = vec4(texture.rgb + (ring * color), texture.a);
+    */
+}