blender/intern/cycles/render/curves.cpp

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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "device.h"
#include "curves.h"
#include "mesh.h"
#include "object.h"
#include "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;
float fc = 0.71f;
float curve_coef[4];
curve_coef[0] = p1[dim];
curve_coef[1] = -fc*p0[dim] + fc*p2[dim];
curve_coef[2] = 2.0f * fc * p0[dim] + (fc - 3.0f) * p1[dim] + (3.0f - 2.0f * fc) * p2[dim] - fc * p3[dim];
curve_coef[3] = -fc * p0[dim] + (2.0f - fc) * p1[dim] + (fc - 2.0f) * p2[dim] + fc * 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));
}
/* Hair System Manager */
CurveSystemManager::CurveSystemManager()
{
primitive = CURVE_LINE_SEGMENTS;
curve_shape = CURVE_THICK;
line_method = CURVE_CORRECTED;
triangle_method = CURVE_CAMERA_TRIANGLES;
resolution = 3;
subdivisions = 3;
minimum_width = 0.0f;
maximum_width = 0.0f;
use_curves = true;
use_encasing = true;
use_backfacing = false;
use_tangent_normal_geometry = false;
need_update = true;
need_mesh_update = false;
}
CurveSystemManager::~CurveSystemManager()
{
}
void CurveSystemManager::device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress)
{
if(!need_update)
return;
device_free(device, dscene);
progress.set_status("Updating Hair settings", "Copying Hair settings to device");
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KernelCurves *kcurve = &dscene->data.curve;
kcurve->curveflags = 0;
if(use_curves) {
if(primitive == CURVE_SEGMENTS || primitive == CURVE_RIBBONS)
kcurve->curveflags |= CURVE_KN_INTERPOLATE;
if(primitive == CURVE_RIBBONS)
kcurve->curveflags |= CURVE_KN_RIBBONS;
if(line_method == CURVE_ACCURATE)
kcurve->curveflags |= CURVE_KN_ACCURATE;
else if(line_method == CURVE_CORRECTED)
kcurve->curveflags |= CURVE_KN_INTERSECTCORRECTION;
if(use_tangent_normal_geometry)
kcurve->curveflags |= CURVE_KN_TRUETANGENTGNORMAL;
if(use_backfacing)
kcurve->curveflags |= CURVE_KN_BACKFACING;
if(use_encasing)
kcurve->curveflags |= CURVE_KN_ENCLOSEFILTER;
kcurve->minimum_width = minimum_width;
kcurve->maximum_width = maximum_width;
kcurve->subdivisions = subdivisions;
}
if(progress.get_cancel()) return;
need_update = false;
}
void CurveSystemManager::device_free(Device *device, DeviceScene *dscene)
{
}
bool CurveSystemManager::modified(const CurveSystemManager& CurveSystemManager)
{
return !(curve_shape == CurveSystemManager.curve_shape &&
line_method == CurveSystemManager.line_method &&
primitive == CurveSystemManager.primitive &&
use_encasing == CurveSystemManager.use_encasing &&
use_tangent_normal_geometry == CurveSystemManager.use_tangent_normal_geometry &&
minimum_width == CurveSystemManager.minimum_width &&
maximum_width == CurveSystemManager.maximum_width &&
use_backfacing == CurveSystemManager.use_backfacing &&
triangle_method == CurveSystemManager.triangle_method &&
resolution == CurveSystemManager.resolution &&
use_curves == CurveSystemManager.use_curves &&
subdivisions == CurveSystemManager.subdivisions);
}
bool CurveSystemManager::modified_mesh(const CurveSystemManager& CurveSystemManager)
{
return !(primitive == CurveSystemManager.primitive &&
curve_shape == CurveSystemManager.curve_shape &&
triangle_method == CurveSystemManager.triangle_method &&
resolution == CurveSystemManager.resolution &&
use_curves == CurveSystemManager.use_curves);
}
void CurveSystemManager::tag_update(Scene *scene)
{
need_update = true;
}
void CurveSystemManager::tag_update_mesh()
{
need_mesh_update = true;
}
CCL_NAMESPACE_END