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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#pragma once
CCL_NAMESPACE_BEGIN
/* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */
ccl_device_inline float3
rgb_ramp_lookup(const float3 *ramp, float f, bool interpolate, bool extrapolate, int table_size)
{
if ((f < 0.0f || f > 1.0f) && extrapolate) {
float3 t0, dy;
if (f < 0.0f) {
t0 = ramp[0];
dy = t0 - ramp[1], f = -f;
}
else {
t0 = ramp[table_size - 1];
dy = t0 - ramp[table_size - 2];
f = f - 1.0f;
}
return t0 + dy * f * (table_size - 1);
}
f = clamp(f, 0.0f, 1.0f) * (table_size - 1);
/* clamp int as well in case of NaN */
int i = clamp(float_to_int(f), 0, table_size - 1);
float t = f - (float)i;
float3 result = ramp[i];
if (interpolate && t > 0.0f) {
result = (1.0f - t) * result + t * ramp[i + 1];
}
return result;
}
ccl_device float float_ramp_lookup(
const float *ramp, float f, bool interpolate, bool extrapolate, int table_size)
{
if ((f < 0.0f || f > 1.0f) && extrapolate) {
float t0, dy;
if (f < 0.0f) {
t0 = ramp[0];
dy = t0 - ramp[1], f = -f;
}
else {
t0 = ramp[table_size - 1];
dy = t0 - ramp[table_size - 2];
f = f - 1.0f;
}
return t0 + dy * f * (table_size - 1);
}
f = clamp(f, 0.0f, 1.0f) * (table_size - 1);
/* clamp int as well in case of NaN */
int i = clamp(float_to_int(f), 0, table_size - 1);
float t = f - (float)i;
float result = ramp[i];
if (interpolate && t > 0.0f) {
result = (1.0f - t) * result + t * ramp[i + 1];
}
return result;
}
CCL_NAMESPACE_END
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