d3d9: Limit "NumSimultaneousRTs" to 4.

dlls/d3d9/d3d9_private.h

@@ -529,6 +529,7 @@ typedef struct IDirect3DVertexShader9Impl {
 } IDirect3DVertexShader9Impl;
 
 #define D3D9_MAX_VERTEX_SHADER_CONSTANTF 256
+#define D3D9_MAX_SIMULTANEOUS_RENDERTARGETS 4
 
 /* --------------------- */
 /* IDirect3DPixelShader9 */

dlls/d3d9/device.c

@@ -992,6 +992,12 @@ static HRESULT  WINAPI  IDirect3DDevice9Impl_SetRenderTarget(LPDIRECT3DDEVICE9EX
     HRESULT hr;
     TRACE("(%p) Relay\n" , This);
 
+    if (RenderTargetIndex >= D3D9_MAX_SIMULTANEOUS_RENDERTARGETS)
+    {
+        WARN("Invalid index %u specified.\n", RenderTargetIndex);
+        return D3DERR_INVALIDCALL;
+    }
+
     wined3d_mutex_lock();
     hr = IWineD3DDevice_SetRenderTarget(This->WineD3DDevice, RenderTargetIndex, pSurface ? pSurface->wineD3DSurface : NULL);
     wined3d_mutex_unlock();
@@ -1010,6 +1016,12 @@ static HRESULT  WINAPI  IDirect3DDevice9Impl_GetRenderTarget(LPDIRECT3DDEVICE9EX
         return D3DERR_INVALIDCALL;
     }
 
+    if (RenderTargetIndex >= D3D9_MAX_SIMULTANEOUS_RENDERTARGETS)
+    {
+        WARN("Invalid index %u specified.\n", RenderTargetIndex);
+        return D3DERR_INVALIDCALL;
+    }
+
     wined3d_mutex_lock();
 
     hr=IWineD3DDevice_GetRenderTarget(This->WineD3DDevice,RenderTargetIndex,&pRenderTarget);

dlls/d3d9/directx.c

@@ -337,6 +337,7 @@ void filter_caps(D3DCAPS9* pCaps)
         D3DPTEXTURECAPS_CUBEMAP_POW2   | D3DPTEXTURECAPS_VOLUMEMAP_POW2| D3DPTEXTURECAPS_NOPROJECTEDBUMPENV;
 
     pCaps->MaxVertexShaderConst = min(D3D9_MAX_VERTEX_SHADER_CONSTANTF, pCaps->MaxVertexShaderConst);
+    pCaps->NumSimultaneousRTs = min(D3D9_MAX_SIMULTANEOUS_RENDERTARGETS, pCaps->NumSimultaneousRTs);
 }
 
 static HRESULT WINAPI IDirect3D9Impl_GetDeviceCaps(LPDIRECT3D9EX iface, UINT Adapter, D3DDEVTYPE DeviceType, D3DCAPS9* pCaps) {