[experimental]: intel vpl encoding on windows

README.md

@@ -42,7 +42,7 @@ This is a fork of [ALVR](https://github.com/polygraphene/ALVR).
 -   SteamVR.
 -   A high-end gaming PC:
     -   See the OS compatibility table above.
-    -   NVIDIA GPU with NVENC support (GTX 1000 series or newer), or an AMD GPU with AMF VCE support, with the latest drivers.
+    -   NVIDIA GPU with NVENC support (GTX 1000 series or newer), an AMD GPU with AMF VCE support, or an INTEL GPU with VPL support (Arc, Tiger Lake or newer), with the latest drivers.
     -   On laptops with both an integrated GPU (Intel HD, AMD iGPU) and a dedicated GPU (NVIDIA GTX/RTX, AMD HD/R5/R7), make sure to assign the dedicated GPU (or "high performance graphics adapter") to ALVR and SteamVR for the best performance and compatibility.  
         (NVIDIA: Nvidia Control Panel → 3D Settings → Application Settings; AMD: similar method)
 

alvr/server_openvr/build.rs

@@ -101,6 +101,22 @@ fn main() {
     #[cfg(feature = "gpl")]
     build.define("ALVR_GPL", None);
 
+    #[cfg(target_os = "windows")]
+    {
+        let vpl_path = alvr_filesystem::deps_dir().join("windows/libvpl/alvr_build");
+        let vpl_include_path = vpl_path.join("include");
+        let vpl_lib_path = vpl_path.join("lib");
+
+        println!(
+            "cargo:rustc-link-search=native={}",
+            vpl_lib_path.to_string_lossy()
+        );
+
+        build.define("ONEVPL_EXPERIMENTAL", None);
+        build.include(vpl_include_path);
+        println!("cargo:rustc-link-lib=static=vpl");
+    }
+
     build.compile("bindings");
 
     #[cfg(all(target_os = "linux", feature = "gpl"))]

alvr/server_openvr/cpp/platform/win32/CEncoder.cpp

@@ -19,10 +19,23 @@ void CEncoder::Initialize(std::shared_ptr<CD3DRender> d3dRender) {
     uint32_t encoderWidth, encoderHeight;
     m_FrameRender->GetEncodingResolution(&encoderWidth, &encoderHeight);
 
+    Exception vplException;
     Exception vceException;
     Exception nvencException;
 #ifdef ALVR_GPL
     Exception swException;
+#endif
+
+    try {
+        Debug("Try to use VideoEncoderVPL.\n");
+        m_videoEncoder = std::make_shared<VideoEncoderVPL>(d3dRender, encoderWidth, encoderHeight);
+        m_videoEncoder->Initialize();
+        return;
+    } catch (Exception e) {
+        vplException = e;
+    }
+
+#ifdef ALVR_GPL
     if (Settings::Instance().m_force_sw_encoding) {
         try {
             Debug("Try to use VideoEncoderSW.\n");
@@ -63,16 +76,18 @@ void CEncoder::Initialize(std::shared_ptr<CD3DRender> d3dRender) {
         swException = e;
     }
     throw MakeException(
-        "All VideoEncoder are not available. VCE: %s, NVENC: %s, SW: %s",
+        "All VideoEncoder are not available. VCE: %s, NVENC: %s, VPL: %s, SW: %s",
         vceException.what(),
         nvencException.what(),
+        vplException.what(),
         swException.what()
     );
 #else
     throw MakeException(
-        "All VideoEncoder are not available. VCE: %s, NVENC: %s",
+        "All VideoEncoder are not available. VCE: %s, NVENC: %s, VPL: %s",
         vceException.what(),
-        nvencException.what()
+        nvencException.what(),
+        vplException.what()
     );
 #endif
 }

alvr/server_openvr/cpp/platform/win32/CEncoder.h

@@ -7,6 +7,7 @@
 #include "VideoEncoder.h"
 #include "VideoEncoderAMF.h"
 #include "VideoEncoderNVENC.h"
+#include "VideoEncoderVPL.h"
 #include "alvr_server/Utils.h"
 #include <d3d11.h>
 #include <d3d11_1.h>