From d6cada50cdfb1cd4a347d7bdfa1c93dfd63ffba4 Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Sat, 11 Mar 2023 16:20:42 -0600
Subject: [PATCH] feat(gx): handle alpha ref render state in d3d backend

---
 src/gx/d3d/CGxDeviceD3d.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/gx/d3d/CGxDeviceD3d.cpp b/src/gx/d3d/CGxDeviceD3d.cpp
index e1d5e03..8687c23 100644
--- a/src/gx/d3d/CGxDeviceD3d.cpp
+++ b/src/gx/d3d/CGxDeviceD3d.cpp
@@ -771,6 +771,19 @@ void CGxDeviceD3d::IRsSendToHw(EGxRenderState which) {
     switch (which) {
     // TODO handle all render states
 
+    case GxRs_AlphaRef: {
+        auto alphaRef = static_cast<int32_t>(state->m_value);
+
+        if (alphaRef <= 0) {
+            this->DsSet(Ds_AlphaTestEnable, 0);
+        } else {
+            this->DsSet(Ds_AlphaRef, alphaRef);
+            this->DsSet(Ds_AlphaTestEnable, 1);
+        }
+
+        break;
+    }
+
     case GxRs_DepthTest:
     case GxRs_DepthFunc: {
         auto depthTest = static_cast<uint32_t>((&this->m_appRenderStates[GxRs_DepthTest])->m_value);