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 * Remove specific license info from outdated readme.txt, instead leave details to the source files.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
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/* SPDX-License-Identifier: Apache-2.0
|
|
* Copyright 2011-2022 Blender Foundation */
|
|
|
|
#include "scene/curves.h"
|
|
#include "device/device.h"
|
|
#include "scene/mesh.h"
|
|
#include "scene/object.h"
|
|
#include "scene/scene.h"
|
|
|
|
#include "util/foreach.h"
|
|
#include "util/map.h"
|
|
#include "util/progress.h"
|
|
#include "util/vector.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* Curve functions */
|
|
|
|
void curvebounds(float *lower, float *upper, float3 *p, int dim)
|
|
{
|
|
float *p0 = &p[0].x;
|
|
float *p1 = &p[1].x;
|
|
float *p2 = &p[2].x;
|
|
float *p3 = &p[3].x;
|
|
|
|
/* Catmull-Rom weights. */
|
|
float curve_coef[4];
|
|
curve_coef[0] = p1[dim];
|
|
curve_coef[1] = 0.5f * (-p0[dim] + p2[dim]);
|
|
curve_coef[2] = 0.5f * (2 * p0[dim] - 5 * p1[dim] + 4 * p2[dim] - p3[dim]);
|
|
curve_coef[3] = 0.5f * (-p0[dim] + 3 * p1[dim] - 3 * p2[dim] + p3[dim]);
|
|
|
|
float discroot = curve_coef[2] * curve_coef[2] - 3 * curve_coef[3] * curve_coef[1];
|
|
float ta = -1.0f;
|
|
float tb = -1.0f;
|
|
|
|
if (discroot >= 0) {
|
|
discroot = sqrtf(discroot);
|
|
ta = (-curve_coef[2] - discroot) / (3 * curve_coef[3]);
|
|
tb = (-curve_coef[2] + discroot) / (3 * curve_coef[3]);
|
|
ta = (ta > 1.0f || ta < 0.0f) ? -1.0f : ta;
|
|
tb = (tb > 1.0f || tb < 0.0f) ? -1.0f : tb;
|
|
}
|
|
|
|
*upper = max(p1[dim], p2[dim]);
|
|
*lower = min(p1[dim], p2[dim]);
|
|
|
|
float exa = p1[dim];
|
|
float exb = p2[dim];
|
|
|
|
if (ta >= 0.0f) {
|
|
float t2 = ta * ta;
|
|
float t3 = t2 * ta;
|
|
exa = curve_coef[3] * t3 + curve_coef[2] * t2 + curve_coef[1] * ta + curve_coef[0];
|
|
}
|
|
if (tb >= 0.0f) {
|
|
float t2 = tb * tb;
|
|
float t3 = t2 * tb;
|
|
exb = curve_coef[3] * t3 + curve_coef[2] * t2 + curve_coef[1] * tb + curve_coef[0];
|
|
}
|
|
|
|
*upper = max(*upper, max(exa, exb));
|
|
*lower = min(*lower, min(exa, exb));
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|