From ae7d84dbc1936ef7ddd00f9c22d074389f97f04f Mon Sep 17 00:00:00 2001 From: Sergey Sharybin Date: Tue, 28 Apr 2015 00:13:03 +0500 Subject: Cycles: Use native saturate function for CUDA This more a workaround for CUDA optimizer which can't optimize clamp(x, 0, 1) into a single instruction and uses 4 instructions instead. Original patch by @lockal with own modification: Don't make changes outside of the kernel. They don't make any difference anyway and term saturate() has a bit different meaning outside of kernel. This gives around 2% of speedup in Barcelona file, but in more complex shader setups with lots of math nodes with clamping speedup could be much nicer. Subscribers: dingto Projects: #cycles Differential Revision: https://developer.blender.org/D1224 --- intern/cycles/kernel/closure/bsdf_oren_nayar.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'intern/cycles/kernel/closure/bsdf_oren_nayar.h') diff --git a/intern/cycles/kernel/closure/bsdf_oren_nayar.h b/intern/cycles/kernel/closure/bsdf_oren_nayar.h index c476d4ca4e2..61b7cb11b02 100644 --- a/intern/cycles/kernel/closure/bsdf_oren_nayar.h +++ b/intern/cycles/kernel/closure/bsdf_oren_nayar.h @@ -37,7 +37,7 @@ ccl_device int bsdf_oren_nayar_setup(ShaderClosure *sc) sc->type = CLOSURE_BSDF_OREN_NAYAR_ID; - sigma = clamp(sigma, 0.0f, 1.0f); + sigma = saturate(sigma); float div = 1.0f / (M_PI_F + ((3.0f * M_PI_F - 4.0f) / 6.0f) * sigma); -- cgit v1.2.3