Cycles: fix rendering with Nishita Sky Texture on Intel Arc GPUs
Speckles and missing lights were experienced in scenes with Nishita Sky Texture and a Sun Size smaller than 1.5°, such as in Lone Monk and Attic scenes. Increasing the precision of cosf fixes it.
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blender-bot
2023-02-15 14:32:30 +01:00
Referenced by issue #100749, Blender LTS: Maintenance Task 3.3 Referenced by pull request #104781, Cycles: fix rendering with Nishita Sky Texture on Intel Arc GPUs in 3.3
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@ -195,7 +195,15 @@ using sycl::half;
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#define fmodf(x, y) sycl::fmod((x), (y))
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#define lgammaf(x) sycl::lgamma((x))
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#define cosf(x) sycl::native::cos(((float)(x)))
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/* sycl::native::cos precision is not sufficient and -ffast-math lets
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* the current DPC++ compiler overload sycl::cos with it.
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* We work around this issue by directly calling the spirv implementation which
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* provides greater precision. */
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#if defined(__SYCL_DEVICE_ONLY__) && defined(__SPIR__)
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# define cosf(x) __spirv_ocl_cos(((float)(x)))
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#else
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# define cosf(x) sycl::cos(((float)(x)))
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#endif
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#define sinf(x) sycl::native::sin(((float)(x)))
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#define powf(x, y) sycl::native::powr(((float)(x)), ((float)(y)))
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#define tanf(x) sycl::native::tan(((float)(x)))
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