Courgeon

Follow up. I got my hands on a Varjo XR3, I had the same effect at first. I finally figured out that the XrCompositionLayerProjection that are submitted must be flagged with XR_COMPOSITION_LAYER_BLEND_TEXTURE_SOURCE_ALPHA_BIT for blend mode to work. At least, it's the case on the Varjo XR3, where the mixed reality now works. However, it doesn't change a thing on the Vive Cosmos. Still getting black instead of video passthrough. M.

Hi, I'm already running the lastest beta version 2.0.21.4

Hello, I'm trying to use the blend mode XR_ENVIRONMENT_BLEND_MODE_ALPHA_BLEND using the Vive Cosmos, hoping that submitting images with alpha set to zero outside rendered objects would use the video feed and create a mixed reality experience. Yet, the background remains black where I was expecting the "real world" video seethrough. Is the Cosmos supposed to handle this ? Best, M.

I found something quite interresting All the examples I used as base were linking the depthInfo (XrCompositionLayerDepthInfoKHR) to the projection_views (XrCompositionLayerProjectionView) using the "next" pointer // depth is chained to projection, not submitted as separate layer projection_views[i].next = &depth.infos[i]; However, It seems that the Vive OpenXR runtime does not allow that and crashes. I just set next to null, and now it works.

If it can help here is the complete log of the XR calls Verbose [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Entering loader trampoline Info [GENERAL | | OpenXR-Loader] : RuntimeManifestFile::FindManifestFiles - using registry-specified runtime file C:\Program Files (x86)\VIVE\Updater\App\ViveVRRuntime\ViveVR_openxr\ViveOpenXR.json Info [GENERAL | | OpenXR-Loader] : RuntimeManifestFile::CreateIfValid - attempting to load C:\Program Files (x86)\VIVE\Updater\App\ViveVRRuntime\ViveVR_openxr\ViveOpenXR.json Info [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : RuntimeInterface::LoadRuntime succeeded loading runtime defined in manifest file C:\Program Files (x86)\VIVE\Updater\App\ViveVRRuntime\ViveVR_openxr\ViveOpenXR.json using interface version 1 and OpenXR API version 1.0 Verbose [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Completed loader trampoline Enumerate number of extension properties : Success Verbose [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Entering loader trampoline Verbose [GENERAL | xrEnumerateInstanceExtensionProperties | OpenXR-Loader] : Completed loader trampoline Enumerate extension properties : Success XR Runtime supports 19 extensions >> XR_EXT_hand_tracking (version 2) >> XR_EXT_eye_gaze_interaction (version 1) >> XR_HTC_facial_tracking (version 1) >> XR_HTC_vive_srworks_pass_through (version 1) >> XR_MSFT_scene_understanding (version 1) >> XR_KHR_D3D11_enable (version 9) >> XR_KHR_D3D12_enable (version 9) >> XR_KHR_win32_convert_performance_counter_time (version 1) >> XR_KHR_visibility_mask (version 2) >> XR_HTC_vive_cosmos_controller_interaction (version 1) >> XR_KHR_opengl_enable (version 10) >> XR_KHR_vulkan_enable (version 8) >> XR_KHR_vulkan_enable2 (version 2) >> XR_EXT_debug_utils (version 4) >> XR_KHR_convert_timespec_time (version 1) >> XR_KHR_composition_layer_depth (version 6) >> XR_FB_passthrough (version 3) >> XR_FB_triangle_mesh (version 2) >> XR_EXT_win32_appcontainer_compatible (version 1) Verbose [GENERAL | xrCreateInstance | OpenXR-Loader] : Entering loader trampoline Warning [GENERAL | | OpenXR-Loader] : ReadLayerDataFilesInRegistry - failed to read registry location \ApiLayers\Explicit in either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER Info [GENERAL | xrCreateInstance | OpenXR-Loader] : ApiLayerInterface::LoadApiLayers succeeded loading layer XR_APILAYER_VIVE_hand_tracking using interface version 1 and OpenXR API version 1.0 Info [GENERAL | xrCreateInstance | OpenXR-Loader] : ApiLayerInterface::LoadApiLayers succeeded loading layer XR_APILAYER_VIVE_facial_tracking using interface version 1 and OpenXR API version 1.0 Info [GENERAL | xrCreateInstance | OpenXR-Loader] : ApiLayerInterface::LoadApiLayers succeeded loading layer XR_APILAYER_VIVE_srworks using interface version 1 and OpenXR API version 1.0 Verbose [GENERAL | xrCreateInstance | OpenXR-Loader] : Entering LoaderInstance::CreateInstance Verbose [GENERAL | xrCreateInstance | OpenXR-Loader] : Entering loader terminator Verbose [GENERAL | xrCreateInstance | OpenXR-Loader] : Completed loader terminator Info [GENERAL | xrCreateInstance | OpenXR-Loader] : LoaderInstance::CreateInstance succeeded with 3 layers enabled and runtime interface - created instance = 0x00000248ff495250 Verbose [GENERAL | xrCreateInstance | OpenXR-Loader] : Completed loader trampoline Create XR instance : Success Get OpenGL graphics requirements function : Success Get XR instance info : Success Runtime Name: Vive Reality Runtime Runtime Version: 0.0.1 Get system for HMD form factor : Success Successfully got XrSystem with id 1 for HMD form factor Get System properties : Success System properties for system 1 Name : Vive OpenXR: Vive SRanipalcking VendorId : 2996 Max Layers : 0 Max swapchain height : 0 Max swapchain width : 0 Orientation Tracking : 0 Position tracking : 0 Get view configuration view count : Success Enumerate view configuration views : Success View Configuration View :0 Resolution : Recommended : 2757 x 3256 Maximum : 2757 x 3256 Swapchain Samples : Recommended : 1 Maximum : 1 View Configuration View :1 Resolution : Recommended : 2757 x 3256 Maximum : 2757 x 3256 Swapchain Samples : Recommended : 1 Maximum : 1 Get OpenGL graphics requirements : Success OpenGL Support : Minimum version : 4.3.0 Maximum version : 4.6.1023 Using OpenGL version: 4.6.0 NVIDIA 517.48 Using OpenGL Renderer: NVIDIA GeForce RTX 3070 Ti/PCIe/SSE2 Create XR session : Success Successfully created a session with OpenGL! Create play space : Success Get number of supported color swapchain formats : Success Runtime supports 3 color swapchain formats Enumerate color swapchain formats : Success Supported GL color format: Rgba8 Supported GL color format: Srgb8Alpha8 Supported GL color format: DepthComponent16Sgix > Using preferred color swapchain format Srgb8Alpha8 Get number of supported depth swapchain formats : Success Runtime supports 3 depth swapchain formats Enumerate depth swapchain formats : Success Supported GL depth format: Rgba8 Supported GL depth format: Srgb8Alpha8 Supported GL depth format: DepthComponent16Sgix > Using preferred depth swapchain format DepthComponent16Sgix Create swapchain 0 : Success Enumerate swapchains : Success Enumerate swapchain images : Success Create swapchain 1 : Success Enumerate swapchains : Success Enumerate swapchain images : Success Create depth swapchain 0 : Success Enumerate depth swapchains : Success Enumerate depth swapchain images : Success Create depth swapchain 1 : Success Enumerate depth swapchains : Success Enumerate depth swapchain images : Success Create ActionSet : Success Create hand pose action : Success Create hand 0 pose space : Success Create hand 1 pose space : Success Attach action set : Success Init scene loading Scene loaded Poll XR events : Success Begin session : Success Waiting for XR frame ready XR wait frame ok Wait XR frame : Success Locate views : Success Sync actions : SessionNotFocused Begin frame : Success fAcquire swapchain image : Success Wait for swapchain image : Success Acquire depth swapchain image : Success Wait for depth swapchain image : Success Using on left eye : Color : 0 ImageID : 1 Depth : 0 ImageID : 7 Release swapchain image : Success Release swapchain depth image : Success fAcquire swapchain image : Success Wait for swapchain image : Success Acquire depth swapchain image : Success Wait for depth swapchain image : Success Using on right eye : Color : 0 ImageID : 4 Depth : 0 ImageID : 10 Release swapchain image : Success Release swapchain depth image : Success Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at Silk.NET.OpenXR.XR.EndFrame(Silk.NET.OpenXR.Session, Silk.NET.OpenXR.FrameEndInfo*) at EGL.core.openxr.XR_Manager.EndFrame() at EGL.core.openxr.XR_Manager+<>c__DisplayClass54_0.<getRenderPassRight>b__1() at EGL.core.renderer.EGL_Renderpass+<>c.<doRender>b__29_1(System.Action) at System.Collections.Generic.List`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ForEach(System.Action`1<System.__Canon>) at EGL.core.renderer.EGL_Renderpass.doRender() at EGL.core.engine.EGL_Engine+<>c.<_initRenderProcess>b__71_4(EGL.core.renderer.EGL_Renderpass) at System.Collections.Generic.List`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ForEach(System.Action`1<System.__Canon>) at EGL.core.engine.EGL_Engine+<>c__DisplayClass71_0.<_initRenderProcess>b__0() at System.Threading.Thread.StartCallback()

Unfortunatly, I cannot share the engine source code. May I have a link to the "HelloXR-OpenGL-Alpha Blend mode" exemple ? regarding the second point, I don't understand what "report number" you are expecting. Thank you M.

Hello, I'm trying to use the Cosmos with our OpenGL engine (c# based), and using OpenXR. We have beeing using Steam OpenVR API for a while, but I'd like to use the Alpha Blend mode using Vive OpenXR. I managed to implement OpenXR in our engine, it works well with Oculus OpenXR (quest 2 + link), and with Steam OpenXR + Vive Cosmos. However, using the Vive OpenXR implementation as target, xrEndFrame crashes with System.AccessViolationException HResult=0x80004003 Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Any idea what's going on ? M.