d7d40745fa
* Split render/ into scene/ and session/. The scene/ folder now contains the scene and its nodes. The session/ folder contains the render session and associated data structures like drivers and render buffers. * Move top level kernel headers into new folders kernel/camera/, kernel/film/, kernel/light/, kernel/sample/, kernel/util/ * Move integrator related kernel headers into kernel/integrator/ * Move OSL shaders from kernel/shaders/ to kernel/osl/shaders/ For patches and branches, git merge and rebase should be able to detect the renames and move over code to the right file.
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "scene/curves.h"
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#include "device/device.h"
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#include "scene/mesh.h"
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#include "scene/object.h"
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#include "scene/scene.h"
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#include "util/util_foreach.h"
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#include "util/util_map.h"
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#include "util/util_progress.h"
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#include "util/util_vector.h"
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CCL_NAMESPACE_BEGIN
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/* Curve functions */
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void curvebounds(float *lower, float *upper, float3 *p, int dim)
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{
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float *p0 = &p[0].x;
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float *p1 = &p[1].x;
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float *p2 = &p[2].x;
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float *p3 = &p[3].x;
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/* Catmull-Rom weights. */
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float curve_coef[4];
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curve_coef[0] = p1[dim];
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curve_coef[1] = 0.5f * (-p0[dim] + p2[dim]);
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curve_coef[2] = 0.5f * (2 * p0[dim] - 5 * p1[dim] + 4 * p2[dim] - p3[dim]);
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curve_coef[3] = 0.5f * (-p0[dim] + 3 * p1[dim] - 3 * p2[dim] + p3[dim]);
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float discroot = curve_coef[2] * curve_coef[2] - 3 * curve_coef[3] * curve_coef[1];
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float ta = -1.0f;
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float tb = -1.0f;
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if (discroot >= 0) {
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discroot = sqrtf(discroot);
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ta = (-curve_coef[2] - discroot) / (3 * curve_coef[3]);
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tb = (-curve_coef[2] + discroot) / (3 * curve_coef[3]);
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ta = (ta > 1.0f || ta < 0.0f) ? -1.0f : ta;
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tb = (tb > 1.0f || tb < 0.0f) ? -1.0f : tb;
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}
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*upper = max(p1[dim], p2[dim]);
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*lower = min(p1[dim], p2[dim]);
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float exa = p1[dim];
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float exb = p2[dim];
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if (ta >= 0.0f) {
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float t2 = ta * ta;
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float t3 = t2 * ta;
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exa = curve_coef[3] * t3 + curve_coef[2] * t2 + curve_coef[1] * ta + curve_coef[0];
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}
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if (tb >= 0.0f) {
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float t2 = tb * tb;
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float t3 = t2 * tb;
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exb = curve_coef[3] * t3 + curve_coef[2] * t2 + curve_coef[1] * tb + curve_coef[0];
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}
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*upper = max(*upper, max(exa, exb));
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*lower = min(*lower, min(exa, exb));
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}
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CCL_NAMESPACE_END
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