[d3d8] Stub ValidatePixelShader and ValidateVertexShader

src/d3d8/d3d8.def

@@ -1,3 +1,6 @@
 LIBRARY D3D8.DLL
 EXPORTS
+  ValidatePixelShader @ 2
+  ValidateVertexShader @ 3
+
   Direct3DCreate8 @ 5

src/d3d8/d3d8.sym

@@ -1,5 +1,7 @@
 {
   global:
+    ValidatePixelShader;
+    ValidateVertexShader;
     Direct3DCreate8;
 
   local:

src/d3d8/d3d8_main.cpp

@@ -13,6 +13,44 @@ namespace dxvk {
 }
 
 extern "C" {
+
+  DLLEXPORT HRESULT __stdcall ValidatePixelShader(
+      const DWORD*     pixelshader,
+      const D3DCAPS8*  caps,
+      BOOL             boolValue,
+      char**           errorString) {
+    dxvk::Logger::warn("D3D8: ValidatePixelShader: Stub");
+
+    if (unlikely(pixelshader == nullptr))
+      return E_FAIL;
+
+    if (likely(errorString != nullptr)) {
+      const char* errorMessage = "";
+      *errorString = (char *) errorMessage;
+    }
+
+    return S_OK;
+  }
+
+  DLLEXPORT HRESULT __stdcall ValidateVertexShader(
+      const DWORD*     vertexShader,
+      const DWORD*     vertexDecl,
+      const D3DCAPS8*  caps,
+      BOOL             boolValue,
+      char**           errorString) {
+    dxvk::Logger::warn("D3D8: ValidateVertexShader: Stub");
+
+    if (unlikely(vertexShader == nullptr))
+      return E_FAIL;
+
+    if (likely(errorString != nullptr)) {
+      const char* errorMessage = "";
+      *errorString = (char *) errorMessage;
+    }
+
+    return S_OK;
+  }
+
   DLLEXPORT IDirect3D8* __stdcall Direct3DCreate8(UINT nSDKVersion) {
     dxvk::Logger::trace("Direct3DCreate8 called");
 
@@ -21,4 +59,5 @@ extern "C" {
 
     return pDirect3D;
   }
+
 }