Remove copy from hsMatrix2SIMD in Metal renderer #1647
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Hoikas
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Dec 31, 2024
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| constexpr const matrix_float4x4* hsMatrix2SIMD(const hsMatrix44& src) | ||
| { | ||
| //reinterperate_cast not allowed in constexpr | ||
| return (simd_float4x4*)(src.fMap); | ||
| } |
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This probably shouldn't be constexpr because there's not really anything that can be done at compile time. Instead, it should be either static inline or just a macro and use reinterpret_cast.
dpogue
reviewed
Dec 31, 2024
hsMatrix2SIMD used to do a transpose of the input hsMatrix - but shaders and code were rewritten to make this unnecessary. hsMatrix2SIMD still does a vestigial memory copy. This commit removes that memory copy. This changes the meaning of hsMatrix2SIMD - so functions that need to make a copy now do so manually. Otherwise a direct cast is made. hsMatrix2SIMD has also been made constexpr. This should result in a small (~1%) performance improvement in the Metal renderer main loop.
colincornaby
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I've rebased this branch to include the Linux runner changes. @dpogue - I'm still considering your question. No real thoughts yet - I think the underlying fMap in the matrix is a pointer type which is why it was a pointer here. Shame the matrix type includes extra data beyond the matrix, but using the fMap as the raw underlying matrix data is a small inconvenience. |
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hsMatrix2SIMD used to do a transpose of the input hsMatrix - but shaders and code were rewritten to make this unnecessary. hsMatrix2SIMD still does a vestigial memory copy. This commit removes that memory copy.
This changes the meaning of hsMatrix2SIMD - so functions that need to make a copy now do so manually. Otherwise a direct cast is made. hsMatrix2SIMD has also been made constexpr.
This should result in a small (~1%) performance improvement in the Metal renderer main loop.