From bbb5aa36ce9b157ce6e7534525afa99716672cee Mon Sep 17 00:00:00 2001
From: WinterSnowfall <WinterSnowfall@users.noreply.github.com>
Date: Wed, 5 Mar 2025 16:20:44 +0200
Subject: [PATCH] [d3d8] Enforce the pCaps->MaxVertexShaderConst limit on VS
 creation

---
 src/d3d9/d3d9_device.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index e090c2ea2..1d73d7190 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -3352,6 +3352,16 @@ namespace dxvk {
       &moduleInfo)))
       return D3DERR_INVALIDCALL;
 
+
+    if (m_isD3D8Compatible && !m_isSWVP) {
+      const uint32_t maxVSConstantIndex = module.GetMaxDefinedConstant();
+      // D3D8 enforces the value advertised in pCaps->MaxVertexShaderConst for HWVP
+      if (unlikely(maxVSConstantIndex > caps::MaxFloatConstantsVS - 1)) {
+        Logger::err(str::format("D3D9DeviceEx::CreateVertexShader: Invalid constant index ", maxVSConstantIndex));
+        return D3DERR_INVALIDCALL;
+      }
+    }
+
     *ppShader = ref(new D3D9VertexShader(this,
       &m_shaderAllocator,
       module,