From e16f68d89d1c4941e2b85020340061e0b61c823f Mon Sep 17 00:00:00 2001
From: Raph Levien <raph.levien@gmail.com>
Date: Tue, 26 May 2020 22:46:33 -0700
Subject: [PATCH] Fix buffer overrun

Was a little too eager zeroing out sh_is_segment[]
---
 piet-gpu/shader/coarse.comp |   2 ++
 piet-gpu/shader/coarse.spv  | Bin 49152 -> 49152 bytes
 2 files changed, 2 insertions(+)

diff --git a/piet-gpu/shader/coarse.comp b/piet-gpu/shader/coarse.comp
index 3a73417..1f73318 100644
--- a/piet-gpu/shader/coarse.comp
+++ b/piet-gpu/shader/coarse.comp
@@ -133,6 +133,8 @@ void main() {
         for (uint i = 0; i < N_SLICE; i++) {
             sh_bitmaps[i][th_ix] = 0;
             sh_backdrop[i][th_ix] = 0;
+        }
+        if (th_ix < N_SLICE) {
             sh_is_segment[th_ix] = 0;
         }
 
diff --git a/piet-gpu/shader/coarse.spv b/piet-gpu/shader/coarse.spv
index 56337efe2c287438514a7be4724992bd6a4f6b2b..d951b247c1f2e6116832ab6fbd677a0e3ef937c0 100644
GIT binary patch
delta 17
YcmZo@U~Xt&-Z00ODTI0RJlmuu0638bTL1t6

delta 17
YcmZo@U~Xt&-Z00O=^4}JdA3PS06d8X>;M1&