From 2d4ec4f858827c24a4fddec7cfa8570fb31957d4 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tomasz@kramkow.ski>
Date: Tue, 3 Nov 2026 23:18:29 +0000
Subject: hlvr: fix video decoding

---
 hlvr/patch-hlvr | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'hlvr')

diff --git a/hlvr/patch-hlvr b/hlvr/patch-hlvr
index d7b8d9d..0594f37 100755
--- a/hlvr/patch-hlvr
+++ b/hlvr/patch-hlvr
@@ -69,6 +69,28 @@ def patch(
 
 
 PATCHES = {
+    "game/hlvr/bin/linuxsteamrt64/libclient.so": patch(
+        "a49955f7935ed21ccbe0c0b75362ca28c94fa922b15d8c6f650b7cc5383138b6",
+        "1a48a9fe4da43cf2ae3a124f38ce96a2b35bdd4d5a8c1a72a4122e4012236d88",
+        (
+            # The `libvideo` that ships with the game seems to be some newer
+            # version which can decode an optional alpha channel. The game
+            # calls `CreateVideoPlayer` (an export of this library) with a
+            # callback that the library calls for every decoded frame of a
+            # video. The callback that `libvideo` expects to call is supposed
+            # to take an extra pointer and stride parameter for the optional
+            # alpha plane. The game passes a callback which presumably matches
+            # an older signature. The result is that the game's callback is
+            # called with the wrong y and u strides (the v and u strides happen
+            # to be the same, so a shift doesn't break them) which causes a
+            # corrupt looking decoding.
+            # This patch shifts the three stack accesses which access the three
+            # stride parameters up by 8 bytes.
+            (0x2DDEDFB, "28"),
+            (0x2DDEE07, "20"),
+            (0x2DDEE0B, "18"),
+        ),
+    ),
     "game/bin/linuxsteamrt64/librendersystemvulkan.so": patch(
         "dc034f6b5d2116393bfead77f3265c124687b76766906c53a077c196b21ffa18",
         "7a52bda8f4e6cc35e5ed46f181c3847400807704cab3fea38b40154d0b977f03",
-- 
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