From 361431d903e9aa8ceb6a9bff0e313d577071b88f Mon Sep 17 00:00:00 2001
From: Edwin Jakobs <edwin@rndr.studio>
Date: Sun, 16 Feb 2020 17:46:39 +0100
Subject: [PATCH] Fix premultiplied alpha in-output of crosshatch shader

---
 .../org/openrndr/extra/fx/gl3/dither/crosshatch.frag          | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/orx-fx/src/main/resources/org/openrndr/extra/fx/gl3/dither/crosshatch.frag b/orx-fx/src/main/resources/org/openrndr/extra/fx/gl3/dither/crosshatch.frag
index 8397a225..6b5fc0e5 100644
--- a/orx-fx/src/main/resources/org/openrndr/extra/fx/gl3/dither/crosshatch.frag
+++ b/orx-fx/src/main/resources/org/openrndr/extra/fx/gl3/dither/crosshatch.frag
@@ -50,6 +50,6 @@ vec3 crosshatch(vec3 texColor, float t1, float t2, float t3, float t4) {
 
 void main() {
     vec4 color = texture(tex0, v_texCoord0);
-    o_color.rgb = crosshatch(color.rgb, t1, t2, t3, t4);
-    o_color.a = color.a;
+    vec3 demultiplied = color.a == 0.0 ? vec3(0.0) : color.rgb/color.a;
+    o_color = vec4(crosshatch(demultiplied, t1, t2, t3, t4), 1.0) * color.a;
 }
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