From 6723f810ed83007e3b9c2721c1ab4e0c20f3a6b5 Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Fri, 10 Mar 2023 16:13:18 -0600
Subject: [PATCH] feat(gx): sync index buffer in d3d backend

---
 src/gx/d3d/CGxDeviceD3d.cpp | 13 ++++++++++++-
 src/gx/d3d/CGxDeviceD3d.hpp |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/gx/d3d/CGxDeviceD3d.cpp b/src/gx/d3d/CGxDeviceD3d.cpp
index 50fba9f..85f9125 100644
--- a/src/gx/d3d/CGxDeviceD3d.cpp
+++ b/src/gx/d3d/CGxDeviceD3d.cpp
@@ -950,7 +950,18 @@ void CGxDeviceD3d::IStateSyncEnables() {
 }
 
 void CGxDeviceD3d::IStateSyncIndexPtr() {
-    // TODO
+    if (!this->m_primIndexDirty) {
+        return;
+    }
+
+    this->m_primIndexDirty = 0;
+
+    auto d3dIndexBuf = static_cast<LPDIRECT3DINDEXBUFFER9>(this->m_primIndexBuf->m_pool->m_apiSpecific);
+
+    if (this->m_d3dCurrentIndexBuf != d3dIndexBuf) {
+        this->m_d3dDevice->SetIndices(d3dIndexBuf);
+        this->m_d3dCurrentIndexBuf = d3dIndexBuf;
+    }
 }
 
 void CGxDeviceD3d::IStateSyncVertexPtrs() {
diff --git a/src/gx/d3d/CGxDeviceD3d.hpp b/src/gx/d3d/CGxDeviceD3d.hpp
index 58030a5..5be3a18 100644
--- a/src/gx/d3d/CGxDeviceD3d.hpp
+++ b/src/gx/d3d/CGxDeviceD3d.hpp
@@ -220,6 +220,7 @@ class CGxDeviceD3d : public CGxDevice {
     int32_t m_d3dIsHwDevice = 0;
     D3DDISPLAYMODE m_desktopDisplayMode;
     D3DFORMAT m_devAdapterFormat;
+    LPDIRECT3DINDEXBUFFER9 m_d3dCurrentIndexBuf;
     uint32_t m_deviceStates[DeviceStates_Last];
 
     // Virtual member functions