OpenXR - Add passthrough option (Quest only)

Common/VR/PPSSPPVR.cpp

@@ -162,6 +162,7 @@ void InitVROnAndroid(void* vm, void* activity, const char* system, int version,
 	} else if ((strcmp(vendor, "META") == 0) || (strcmp(vendor, "OCULUS") == 0)) {
 		VR_SetPlatformFLag(VR_PLATFORM_CONTROLLER_QUEST, true);
 		VR_SetPlatformFLag(VR_PLATFORM_EXTENSION_FOVEATION, true);
+		VR_SetPlatformFLag(VR_PLATFORM_EXTENSION_PASSTHROUGH, true);
 		VR_SetPlatformFLag(VR_PLATFORM_EXTENSION_PERFORMANCE, true);
 	}
 	VR_SetPlatformFLag(VR_PLATFORM_RENDERER_VULKAN, (GPUBackend)g_Config.iGPUBackend == GPUBackend::VULKAN);
@@ -792,6 +793,7 @@ bool StartVRRender() {
 		// Set customizations
 		__DisplaySetFramerate(g_Config.bForce72Hz ? 72 : 60);
 		VR_SetConfigFloat(VR_CONFIG_CANVAS_DISTANCE, g_Config.fCanvasDistance);
+		VR_SetConfig(VR_CONFIG_PASSTHROUGH, g_Config.bPassthrough);
 		vrMirroring[VR_MIRRORING_UPDATED] = false;
 		return true;
 	}
@@ -828,6 +830,10 @@ bool IsMultiviewSupported() {
 	return false;
 }
 
+bool IsPassthroughSupported() {
+	return VR_GetPlatformFlag(VR_PLATFORM_EXTENSION_PASSTHROUGH);
+}
+
 bool IsFlatVRGame() {
 	return vrFlatGame;
 }

Common/VR/PPSSPPVR.h

@@ -51,6 +51,7 @@ void PostVRFrameRender();
 int GetVRFBOIndex();
 int GetVRPassesCount();
 bool IsMultiviewSupported();
+bool IsPassthroughSupported();
 bool IsFlatVRGame();
 bool IsFlatVRScene();
 bool IsGameVRScene();

Common/VR/VRBase.cpp

@@ -61,6 +61,9 @@ void VR_Init( void* system, const char* name, int version ) {
 	if (VR_GetPlatformFlag(VR_PLATFORM_EXTENSION_INSTANCE)) {
 		extensions.push_back(XR_KHR_ANDROID_CREATE_INSTANCE_EXTENSION_NAME);
 	}
+	if (VR_GetPlatformFlag(VR_PLATFORM_EXTENSION_PASSTHROUGH)) {
+		extensions.push_back(XR_FB_PASSTHROUGH_EXTENSION_NAME);
+	}
 	if (VR_GetPlatformFlag(VR_PLATFORM_EXTENSION_PERFORMANCE)) {
 		extensions.push_back(XR_EXT_PERFORMANCE_SETTINGS_EXTENSION_NAME);
 		extensions.push_back(XR_KHR_ANDROID_THREAD_SETTINGS_EXTENSION_NAME);

Common/VR/VRBase.h

@@ -42,12 +42,16 @@ static void OXR_CheckErrors(XrInstance instance, XrResult result, const char* fu
 #define OXR(func) func;
 #endif
 
-enum { ovrMaxLayerCount = 2 };
+#define DECL_PFN(pfn) PFN_##pfn pfn = nullptr
+#define INIT_PFN(pfn) OXR(xrGetInstanceProcAddr(engine->appState.Instance, #pfn, (PFN_xrVoidFunction*)(&pfn)))
+
+enum { ovrMaxLayerCount = 3 };
 enum { ovrMaxNumEyes = 2 };
 
 typedef union {
 	XrCompositionLayerProjection Projection;
 	XrCompositionLayerCylinderKHR Cylinder;
+	XrCompositionLayerPassthroughFB Passthrough;
 } ovrCompositorLayer_Union;
 
 typedef struct {
@@ -122,6 +126,7 @@ enum VRPlatformFlag {
 	VR_PLATFORM_CONTROLLER_QUEST,
 	VR_PLATFORM_EXTENSION_FOVEATION,
 	VR_PLATFORM_EXTENSION_INSTANCE,
+	VR_PLATFORM_EXTENSION_PASSTHROUGH,
 	VR_PLATFORM_EXTENSION_PERFORMANCE,
 	VR_PLATFORM_RENDERER_VULKAN,
 	VR_PLATFORM_TRACKING_FLOOR,

Common/VR/VRRenderer.cpp

@@ -20,6 +20,17 @@ float vrConfigFloat[VR_CONFIG_FLOAT_MAX] = {};
 
 XrVector3f hmdorientation;
 
+XrPassthroughFB passthrough = XR_NULL_HANDLE;
+XrPassthroughLayerFB passthroughLayer = XR_NULL_HANDLE;
+DECL_PFN(xrCreatePassthroughFB);
+DECL_PFN(xrDestroyPassthroughFB);
+DECL_PFN(xrPassthroughStartFB);
+DECL_PFN(xrPassthroughPauseFB);
+DECL_PFN(xrCreatePassthroughLayerFB);
+DECL_PFN(xrDestroyPassthroughLayerFB);
+DECL_PFN(xrPassthroughLayerPauseFB);
+DECL_PFN(xrPassthroughLayerResumeFB);
+
 void VR_UpdateStageBounds(ovrApp* pappState) {
 	XrExtent2Df stageBounds = {};
 
@@ -179,6 +190,17 @@ void VR_InitRenderer( engine_t* engine, bool multiview ) {
 		VR_DestroyRenderer(engine);
 	}
 
+	if (VR_GetPlatformFlag(VRPlatformFlag::VR_PLATFORM_EXTENSION_PASSTHROUGH)) {
+		INIT_PFN(xrCreatePassthroughFB);
+		INIT_PFN(xrDestroyPassthroughFB);
+		INIT_PFN(xrPassthroughStartFB);
+		INIT_PFN(xrPassthroughPauseFB);
+		INIT_PFN(xrCreatePassthroughLayerFB);
+		INIT_PFN(xrDestroyPassthroughLayerFB);
+		INIT_PFN(xrPassthroughLayerPauseFB);
+		INIT_PFN(xrPassthroughLayerResumeFB);
+	}
+
 	int eyeW, eyeH;
 	VR_GetResolution(engine, &eyeW, &eyeH);
 	VR_SetConfig(VR_CONFIG_VIEWPORT_WIDTH, eyeW);
@@ -221,10 +243,32 @@ void VR_InitRenderer( engine_t* engine, bool multiview ) {
 		ovrRenderer_SetFoveation(&engine->appState.Instance, &engine->appState.Session, &engine->appState.Renderer, XR_FOVEATION_LEVEL_HIGH_TOP_FB, 0, XR_FOVEATION_DYNAMIC_LEVEL_ENABLED_FB);
 	}
 #endif
+
+	if (VR_GetPlatformFlag(VRPlatformFlag::VR_PLATFORM_EXTENSION_PASSTHROUGH)) {
+		XrPassthroughCreateInfoFB ptci = {XR_TYPE_PASSTHROUGH_CREATE_INFO_FB};
+		XrResult result;
+		OXR(result = xrCreatePassthroughFB(engine->appState.Session, &ptci, &passthrough));
+
+		if (XR_SUCCEEDED(result)) {
+			XrPassthroughLayerCreateInfoFB plci = {XR_TYPE_PASSTHROUGH_LAYER_CREATE_INFO_FB};
+			plci.passthrough = passthrough;
+			plci.purpose = XR_PASSTHROUGH_LAYER_PURPOSE_RECONSTRUCTION_FB;
+			OXR(xrCreatePassthroughLayerFB(engine->appState.Session, &plci, &passthroughLayer));
+		}
+
+		OXR(xrPassthroughStartFB(passthrough));
+		OXR(xrPassthroughLayerResumeFB(passthroughLayer));
+	}
 	initialized = true;
 }
 
 void VR_DestroyRenderer( engine_t* engine ) {
+	if (VR_GetPlatformFlag(VRPlatformFlag::VR_PLATFORM_EXTENSION_PASSTHROUGH)) {
+		OXR(xrPassthroughLayerPauseFB(passthroughLayer));
+		OXR(xrPassthroughPauseFB(passthrough));
+		OXR(xrDestroyPassthroughFB(passthrough));
+		passthrough = XR_NULL_HANDLE;
+	}
 	ovrRenderer_Destroy(&engine->appState.Renderer);
 	free(projections);
 	initialized = false;
@@ -328,6 +372,16 @@ void VR_EndFrame( engine_t* engine ) {
 
 void VR_FinishFrame( engine_t* engine ) {
 
+	if (VR_GetPlatformFlag(VRPlatformFlag::VR_PLATFORM_EXTENSION_PASSTHROUGH) && VR_GetConfig(VR_CONFIG_PASSTHROUGH)) {
+		if (passthroughLayer != XR_NULL_HANDLE) {
+			XrCompositionLayerPassthroughFB passthrough_layer = {XR_TYPE_COMPOSITION_LAYER_PASSTHROUGH_FB};
+			passthrough_layer.layerHandle = passthroughLayer;
+			passthrough_layer.flags = XR_COMPOSITION_LAYER_BLEND_TEXTURE_SOURCE_ALPHA_BIT;
+			passthrough_layer.space = XR_NULL_HANDLE;
+			engine->appState.Layers[engine->appState.LayerCount++].Passthrough = passthrough_layer;
+		}
+	}
+
 	int vrMode = vrConfig[VR_CONFIG_MODE];
 	XrCompositionLayerProjectionView projection_layer_elements[2] = {};
 	if ((vrMode == VR_MODE_MONO_6DOF) || (vrMode == VR_MODE_STEREO_6DOF)) {

Common/VR/VRRenderer.h

@@ -4,8 +4,8 @@
 #include "VRMath.h"
 
 enum VRConfig {
-	//switching between 2D and 3D
-	VR_CONFIG_MODE,
+	//switching between mode
+	VR_CONFIG_MODE, VR_CONFIG_PASSTHROUGH,
 	//mouse cursor
 	VR_CONFIG_MOUSE_SIZE, VR_CONFIG_MOUSE_X, VR_CONFIG_MOUSE_Y,
 	//viewport setup

Core/Config.cpp

@@ -839,6 +839,7 @@ static const ConfigSetting vrSettings[] = {
 	ConfigSetting("VREnableMotions", &g_Config.bEnableMotions, true, CfgFlag::PER_GAME),
 	ConfigSetting("VRForce72Hz", &g_Config.bForce72Hz, true, CfgFlag::PER_GAME),
 	ConfigSetting("VRManualForceVR", &g_Config.bManualForceVR, false, CfgFlag::PER_GAME),
+	ConfigSetting("VRPassthrough", &g_Config.bPassthrough, false, CfgFlag::PER_GAME),
 	ConfigSetting("VRRescaleHUD", &g_Config.bRescaleHUD, true, CfgFlag::PER_GAME),
 	ConfigSetting("VRCameraDistance", &g_Config.fCameraDistance, 0.0f, CfgFlag::PER_GAME),
 	ConfigSetting("VRCameraHeight", &g_Config.fCameraHeight, 0.0f, CfgFlag::PER_GAME),

Core/Config.h

@@ -453,6 +453,7 @@ struct Config {
 	bool bEnableMotions;
 	bool bForce72Hz;
 	bool bManualForceVR;
+	bool bPassthrough;
 	bool bRescaleHUD;
 	float fCameraDistance;
 	float fCameraHeight;

UI/GameSettingsScreen.cpp

@@ -1152,6 +1152,9 @@ void GameSettingsScreen::CreateVRSettings(UI::ViewGroup *vrSettings) {
 	vr6DoF->SetEnabledPtr(&g_Config.bEnableVR);
 	vrSettings->Add(new CheckBox(&g_Config.bEnableStereo, vr->T("Stereoscopic vision (Experimental)")));
 	vrSettings->Add(new CheckBox(&g_Config.bForce72Hz, vr->T("Force 72Hz update")));
+	if (IsPassthroughSupported()) {
+		vrSettings->Add(new CheckBox(&g_Config.bPassthrough, vr->T("Enable passthrough")));
+	}
 
 	vrSettings->Add(new ItemHeader(vr->T("VR camera")));
 	vrSettings->Add(new PopupSliderChoiceFloat(&g_Config.fCanvasDistance, 1.0f, 15.0f, 12.0f, vr->T("Distance to 2D menus and scenes"), 1.0f, screenManager(), ""));

android/VRManifest.xml

@@ -3,6 +3,7 @@
 
     <uses-feature android:glEsVersion="0x00030001" />
     <uses-feature android:name="android.hardware.vr.headtracking" android:version="1" android:required="true" />
+    <uses-feature android:name="com.oculus.feature.PASSTHROUGH" android:required="false" />
 
     <application
         android:allowBackup="true"