9cfc7967dd
* Replace license text in headers with SPDX identifiers. * Remove specific license info from outdated readme.txt, instead leave details to the source files. * Add list of SPDX license identifiers used, and corresponding license texts. * Update copyright dates while we're at it. Ref D14069, T95597
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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CCL_NAMESPACE_BEGIN
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/* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */
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ccl_device_inline float3
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rgb_ramp_lookup(const float3 *ramp, float f, bool interpolate, bool extrapolate, int table_size)
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{
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if ((f < 0.0f || f > 1.0f) && extrapolate) {
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float3 t0, dy;
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if (f < 0.0f) {
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t0 = ramp[0];
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dy = t0 - ramp[1], f = -f;
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}
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else {
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t0 = ramp[table_size - 1];
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dy = t0 - ramp[table_size - 2];
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f = f - 1.0f;
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}
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return t0 + dy * f * (table_size - 1);
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}
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f = clamp(f, 0.0f, 1.0f) * (table_size - 1);
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/* clamp int as well in case of NaN */
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int i = clamp(float_to_int(f), 0, table_size - 1);
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float t = f - (float)i;
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float3 result = ramp[i];
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if (interpolate && t > 0.0f) {
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result = (1.0f - t) * result + t * ramp[i + 1];
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}
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return result;
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}
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ccl_device float float_ramp_lookup(
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const float *ramp, float f, bool interpolate, bool extrapolate, int table_size)
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{
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if ((f < 0.0f || f > 1.0f) && extrapolate) {
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float t0, dy;
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if (f < 0.0f) {
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t0 = ramp[0];
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dy = t0 - ramp[1], f = -f;
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}
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else {
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t0 = ramp[table_size - 1];
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dy = t0 - ramp[table_size - 2];
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f = f - 1.0f;
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}
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return t0 + dy * f * (table_size - 1);
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}
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f = clamp(f, 0.0f, 1.0f) * (table_size - 1);
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/* clamp int as well in case of NaN */
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int i = clamp(float_to_int(f), 0, table_size - 1);
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float t = f - (float)i;
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float result = ramp[i];
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if (interpolate && t > 0.0f) {
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result = (1.0f - t) * result + t * ramp[i + 1];
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}
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return result;
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}
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CCL_NAMESPACE_END
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