From 3648c27f41c89cf7192f67724826411a55b9e75b Mon Sep 17 00:00:00 2001
From: rexim <reximkut@gmail.com>
Date: Thu, 21 Nov 2019 00:18:41 +0700
Subject: [PATCH] (#55) Use mix for flashlight effect

---
 src/frag.glsl | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/frag.glsl b/src/frag.glsl
index dc27938..2ad4524 100644
--- a/src/frag.glsl
+++ b/src/frag.glsl
@@ -11,9 +11,7 @@ const float FLASHLIGHT_RADIUS = 200.0;
 void main()
 {
     vec4 cursor = vec4(cursorPos.x, windowSize.y - cursorPos.y, 0.0, 1.0);
-    if (length(cursor - gl_FragCoord) < FLASHLIGHT_RADIUS) {
-        color = texture(tex, texcoord);
-    } else {
-        color = texture(tex, texcoord) - vec4(flShadow, flShadow, flShadow, 0.0);
-    }
+    color = mix(
+        texture(tex, texcoord), vec4(0.0, 0.0, 0.0, 0.0),
+        length(cursor - gl_FragCoord) < FLASHLIGHT_RADIUS ? 0.0 : flShadow);
 }