From 0b1ea464bb885f46829fa9e7b04e79d67826e84c Mon Sep 17 00:00:00 2001
From: Kelsi <kelsihates2fa@gmail.com>
Date: Sat, 14 Mar 2026 06:10:20 -0700
Subject: [PATCH] fix(render): premultiply glow sprite color by alpha

---
 assets/shaders/m2_particle.frag.glsl | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/assets/shaders/m2_particle.frag.glsl b/assets/shaders/m2_particle.frag.glsl
index f91a3fb7..49fac7e1 100644
--- a/assets/shaders/m2_particle.frag.glsl
+++ b/assets/shaders/m2_particle.frag.glsl
@@ -25,6 +25,9 @@ void main() {
         if (lum < 0.05) discard;
     }
 
-    float edge = smoothstep(0.5, 0.4, length(p - 0.5));
-    outColor = texColor * vColor * vec4(vec3(1.0), edge);
+    // Soft circular falloff for point-sprite edges.
+    float edge = 1.0 - smoothstep(0.4, 0.5, length(p - 0.5));
+    float alpha = texColor.a * vColor.a * edge;
+    vec3 rgb = texColor.rgb * vColor.rgb * alpha;
+    outColor = vec4(rgb, alpha);
 }