diff options
Diffstat (limited to 'intern/cycles/util/util_math.h')
| -rw-r--r-- | intern/cycles/util/util_math.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/intern/cycles/util/util_math.h b/intern/cycles/util/util_math.h index d0e91a2a1c9..fd3199f209f 100644 --- a/intern/cycles/util/util_math.h +++ b/intern/cycles/util/util_math.h @@ -310,6 +310,17 @@ ccl_device_inline float4 float3_to_float4(const float3 a) return make_float4(a.x, a.y, a.z, 1.0f); } +ccl_device_inline float inverse_lerp(float a, float b, float x) +{ + return (x - a) / (b - a); +} + +/* Cubic interpolation between b and c, a and d are the previous and next point. */ +ccl_device_inline float cubic_interp(float a, float b, float c, float d, float x) +{ + return 0.5f*(((d + 3.0f*(b-c) - a)*x + (2.0f*a - 5.0f*b + 4.0f*c - d))*x + (c - a))*x + b; +} + CCL_NAMESPACE_END #include "util/util_math_int2.h" |