diff options
Diffstat (limited to 'intern/cycles/util/util_math_fast.h')
| -rw-r--r-- | intern/cycles/util/util_math_fast.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/intern/cycles/util/util_math_fast.h b/intern/cycles/util/util_math_fast.h index d3960deb3b4..323d40058e5 100644 --- a/intern/cycles/util/util_math_fast.h +++ b/intern/cycles/util/util_math_fast.h @@ -58,6 +58,11 @@ ccl_device_inline float madd(const float a, const float b, const float c) return a * b + c; } +ccl_device_inline float4 madd4(const float4 a, const float4 b, const float4 c) +{ + return a * b + c; +} + /* * FAST & APPROXIMATE MATH * @@ -438,6 +443,29 @@ ccl_device_inline float fast_expf(float x) return fast_exp2f(x / M_LN2_F); } +#ifndef __KERNEL_GPU__ +ccl_device float4 fast_exp2f4(float4 x) +{ + const float4 one = make_float4(1.0f); + const float4 limit = make_float4(126.0f); + x = clamp(x, -limit, limit); + int4 m = make_int4(x); + x = one - (one - (x - make_float4(m))); + float4 r = make_float4(1.33336498402e-3f); + r = madd4(x, r, make_float4(9.810352697968e-3f)); + r = madd4(x, r, make_float4(5.551834031939e-2f)); + r = madd4(x, r, make_float4(0.2401793301105f)); + r = madd4(x, r, make_float4(0.693144857883f)); + r = madd4(x, r, make_float4(1.0f)); + return __int4_as_float4(__float4_as_int4(r) + (m << 23)); +} + +ccl_device_inline float4 fast_expf4(float4 x) +{ + return fast_exp2f4(x / M_LN2_F); +} +#endif + ccl_device_inline float fast_exp10(float x) { /* Examined 2217701018 values of exp10 on [-37.9290009,37.9290009]: |