From 8a3a8b7c684996d2ea72a95e5abd62b1e763f344 Mon Sep 17 00:00:00 2001
From: RSDuck <RSDuck@users.noreply.github.com>
Date: Fri, 22 Jan 2021 12:19:46 +0100
Subject: [PATCH] include polygon attr opaqueness for translucent polygons in
 render key

---
 src/GPU3D_OpenGL.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/GPU3D_OpenGL.cpp b/src/GPU3D_OpenGL.cpp
index f24567c3..381af9d6 100644
--- a/src/GPU3D_OpenGL.cpp
+++ b/src/GPU3D_OpenGL.cpp
@@ -474,6 +474,7 @@ void SetupPolygon(RendererPolygon* rp, Polygon* polygon)
     // - depthfunc
     // -- depthwrite
     // --- polyID
+    // ---- need opaque
     // shadow mask polygons:
     // - depthfunc?????
     // shadow polygons:
@@ -491,6 +492,8 @@ void SetupPolygon(RendererPolygon* rp, Polygon* polygon)
             rp->RenderKey |= (polygon->Attr >> 10) & 0x2; // bit11 - depth write
             rp->RenderKey |= (polygon->Attr >> 13) & 0x4; // bit15 - fog
             rp->RenderKey |= (polygon->Attr & 0x3F000000) >> 16; // polygon ID
+            if ((polygon->Attr & 0x001F0000) == 0x001F0000) // need opaque
+                rp->RenderKey |= 0x4000;
         }
         else
         {