From 56c646d82cdb78557cac7a527247bb46c6028e97 Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Fri, 11 Mar 2022 17:16:56 -0500
Subject: Maxwell3D: Restrict topology override effect to after the register is
 set

---
 src/video_core/engines/maxwell_3d.cpp | 5 ++++-
 src/video_core/engines/maxwell_3d.h   | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/video_core')

diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index 94711ad6b..92baba4e8 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -214,6 +214,9 @@ void Maxwell3D::ProcessMethodCall(u32 method, u32 argument, u32 nonshadow_argume
         regs.index_array.first = regs.small_index.first;
         dirty.flags[VideoCommon::Dirty::IndexBuffer] = true;
         return DrawArrays();
+    case MAXWELL3D_REG_INDEX(topology_override):
+        use_topology_override = true;
+        return;
     case MAXWELL3D_REG_INDEX(clear_buffers):
         return ProcessClearBuffers();
     case MAXWELL3D_REG_INDEX(query.query_get):
@@ -367,7 +370,7 @@ void Maxwell3D::CallMethodFromMME(u32 method, u32 method_argument) {
 }
 
 void Maxwell3D::ProcessTopologyOverride() {
-    if (regs.draw.topology != regs.topology_override) {
+    if (use_topology_override) {
         regs.draw.topology.Assign(regs.topology_override);
     }
 }
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index e28937b01..eefb7a4dd 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -1581,6 +1581,7 @@ private:
     Upload::State upload_state;
 
     bool execute_on{true};
+    bool use_topology_override{false};
 };
 
 #define ASSERT_REG_POSITION(field_name, position)                                                  \
-- 
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