On Fri, Nov 3, 2017 at 2:05 PM, Steve Canon via swift-evolution < [email protected]> wrote:
> If/when 16b floats were added to the standard lib, you would just write: > > let vertexData: [Float16] = [ 1, 0, 0.5, 1 ] > > I should note that something like vertex coordinates is usually better > modeled with a more specific type than [Float], like SCNVector4 or > simd.float4 or your own type, which also solves this problem: > > import SceneKit > let vertexData = SCNVector4(1, 0, 0.5, 1) > > import simd > let vertexData = float4(1, 0, 0.5, 1) > > (NB both of these frameworks are Apple-specific). > > - Steve > > Sent from my iPhone > If @_fixed_layout was supported this would be sensible, but most graphics frameworks expect a plain buffer of floats and the packing order is implicit. We can’t model vertex vectors with Swift structs because we can’t safely pointer-cast them to an array of floats. > > On Nov 3, 2017, at 14:58, Tony Allevato via swift-evolution < > [email protected]> wrote: > > You can write this for the first thing that you want: > > let vertexData: [Float] = [1.0, 0.0, 0.5, 1.0] > > I don't know enough about 16-bit floats to comment on those. > > > On Fri, Nov 3, 2017 at 11:26 AM nick ralabate via swift-evolution < > [email protected]> wrote: > >> I think it would be helpful for graphics programmers to specify vertex >> data inline without surrounding every value with Float(4.0). >> >> Something like this: >> >> let vertexData = [ 1.0f, 0.0f, 0.5f, 1.0f ] >> >> Also, it would be great if Swift had a type for half-floats to match the >> iPhone GPU: >> >> let vertexData = [ 1.0h, 0.0h, 0.5h, 1.0h] >> >> >> Thanks! >> _______________________________________________ >> swift-evolution mailing list >> [email protected] >> https://lists.swift.org/mailman/listinfo/swift-evolution >> > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution > > > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution > >
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