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Vulkan's VertexIndex and InstanceIndex don't match with hardware. This is because Nvidia implements gl_VertexID and gl_InstanceID. The math that relates these is: gl_VertexIndex = gl_BaseVertex + gl_VertexID gl_InstanceIndex = gl_InstanceIndex + gl_InstanceID To emulate it using what Vulkan's SPIR-V offers (the *Index variants) this commit substracts gl_Base* from gl_*Index to obtain the OpenGL and hardware's equivalent.