WebGPU: ignore blocking synchronization calls on the Web

Author: TheMostDiligent

Graphics/GraphicsEngineWebGPU/src/DeviceContextWebGPUImpl.cpp

@@ -1267,7 +1267,11 @@ void DeviceContextWebGPUImpl::DeviceWaitForFence(IFence* pFence, Uint64 Value)
 void DeviceContextWebGPUImpl::WaitForIdle()
 {
     Flush();
+#if PLATFORM_EMSCRIPTEN
+    LOG_ERROR_MESSAGE("IDeviceContext::WaitForIdle() is not supported on the Web. Use non-blocking synchronization methods.");
+#else
     m_pFence->Wait(m_FenceValue);
+#endif
 }
 
 void DeviceContextWebGPUImpl::BeginQuery(IQuery* pQuery)

Graphics/GraphicsEngineWebGPU/src/FenceWebGPUImpl.cpp

@@ -86,8 +86,12 @@ void FenceWebGPUImpl::Signal(Uint64 Value)
 
 void FenceWebGPUImpl::Wait(Uint64 Value)
 {
+#if PLATFORM_EMSCRIPTEN
+    LOG_ERROR_MESSAGE("IFence::Wait() is not supported on the Web. Use non-blocking synchronization methods.");
+#else
     while (GetCompletedValue() < Value)
         m_pDevice->DeviceTick();
+#endif
 }
 
 void FenceWebGPUImpl::AppendSyncPoints(const std::vector<RefCntAutoPtr<SyncPointWebGPUImpl>>& SyncPoints, Uint64 Value)

Graphics/GraphicsEngineWebGPU/src/RenderDeviceWebGPUImpl.cpp

@@ -126,7 +126,9 @@ RenderDeviceWebGPUImpl::~RenderDeviceWebGPUImpl()
 #if !DILIGENT_NO_GLSLANG
     GLSLangUtils::FinalizeGlslang();
 #endif
+#if !PLATFORM_EMSCRIPTEN
     IdleGPU();
+#endif
 }
 
 void RenderDeviceWebGPUImpl::CreateBuffer(const BufferDesc& BuffDesc,
@@ -293,9 +295,13 @@ WGPUDevice RenderDeviceWebGPUImpl::GetWebGPUDevice() const
 
 void RenderDeviceWebGPUImpl::IdleGPU()
 {
+#if PLATFORM_EMSCRIPTEN
+    LOG_ERROR_MESSAGE("IRenderDevice::IdleGPU() is not supported on the Web. Use non-blocking synchronization methods.");
+#else
     VERIFY_EXPR(m_wpImmediateContexts.size() == 1);
     if (auto pImmediateCtx = m_wpImmediateContexts[0].Lock())
         pImmediateCtx->WaitForIdle();
+#endif
 }
 
 void RenderDeviceWebGPUImpl::CreateTextureFromWebGPUTexture(WGPUTexture        wgpuTexture,