@warrenm Do I need both a vertex and a fragment shader like I do with GLSL? My base template has no vertex buffer to be shaded.
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@RedQueenCoder@warrenm You don’t necessarily need a fragment shader but you do need a vertex. Why is it optional?
https://developer.apple.com/library/ios/documentation/Metal/Reference/MTLRenderPipelineDescriptor_Ref/#//apple_ref/occ/instp/MTLRenderPipelineDescriptor/vertexFunction …
@jessyMeow @RedQueenCoder Omitting a fragment function allows you to write to a buffer from the vertex function; cf. transform feedback.
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@warrenm@RedQueenCoder I meant, “why is the vertex function not an implicitly unwrapped optional, instead of a regular question mark one?”. -
@jessyMeow Consistency? Also, the framework never assumes vertexFunction is non-nil; it checks the invariant to provide a helpful message. -
@warrenm@jessymeow print(vertexFunction) gives the "fatal error: unexpectedly found nil while unwrapping an Optional value" which is right.
End of conversation
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