sparkengine-rendering-rhi-rendergraph-and-shaders

This error means two passes wrote the same resource version, usually because a stale pre-write handle was reused. Write() returns a handle with version+1, and that returned handle must be passed to all subsequent readers and writers.

Set the SPARK_RHI_BACKEND environment variable to d3d11, d3d12, vulkan, opengl, or null before launching. Setting it to null forces the headless NullRHIDevice, which is the supported approach for CI and GPU-less runs.

Passes are culled unless they call builder.SideEffect(), write an imported resource, or feed a surviving pass. Check graph.GetStats().culledPasses and DebugVisualize() to confirm which condition your pass missed.

DXR is wired end-to-end for D3D12 with pre-compiled DXIL shaders, but GPU-level certification is still open under gate G09. HybridRT does not run on Windows because AcquireHybridRTBindings() returns an empty struct, so the pass exits early.

Yes, the RenderGraph constructor accepts an optional device pointer. Without a device it compiles and executes pass callbacks in analysis-only mode, returning nullptr for transient resources, which is how TestRenderGraph.cpp runs contract tests headlessly.

No, ShaderHotReload::Initialize has no production caller, so file-watch recompilation never occurs in the shipped engine. The shader disk cache is initialized and is what the shader daemon attaches to.