+++ /dev/null
-#include <cmath>
-#include <msp/datafile/collection.h>
-#include <msp/time/units.h>
-#include "animation.h"
-#include "keyframe.h"
-
-using namespace std;
-
-#include <msp/io/print.h>
-
-namespace Msp {
-namespace GL {
-
-Animation::Animation():
- looping(false)
-{ }
-
-void Animation::add_keyframe(const Time::TimeDelta &t, const KeyFrame &kf)
-{
- if(!keyframes.empty() && t<keyframes.back().time)
- throw invalid_argument("Animation::add_keyframe");
-
- TimedKeyFrame tkf;
- tkf.time = t;
- tkf.keyframe = &kf;
- tkf.keyframe.keep();
- prepare_keyframe(tkf);
- keyframes.push_back(tkf);
-}
-
-void Animation::prepare_keyframe(TimedKeyFrame &tkf)
-{
- tkf.prev = (keyframes.empty() ? 0 : &keyframes.back());
- if(!tkf.prev)
- return;
-
- tkf.delta_t = tkf.time-tkf.prev->time;
-
- const double *m1_data = tkf.prev->keyframe->get_matrix().data();
- const double *m2_data = tkf.keyframe->get_matrix().data();
- for(unsigned i=0; i<3; ++i)
- {
- const double *m1_col = m1_data+i*4;
- const double *m2_col = m2_data+i*4;
-
- // Compute a normalized vector halfway between the two endpoints
- double half[3];
- double len = 0;
- for(unsigned j=0; j<3; ++j)
- {
- half[j] = (m1_col[j]+m2_col[j])/2;
- len += half[j]*half[j];
- }
- len = sqrt(len);
- for(unsigned j=0; j<3; ++j)
- half[j] /= len;
-
- // Compute correction factors for smooth interpolation
- double cos_half = m1_col[0]*half[0]+m1_col[1]*half[1]+m1_col[2]*half[2];
- double angle = acos(cos_half);
- tkf.axes[i].slope = (angle ? angle/tan(angle) : 1);
- tkf.axes[i].scale = cos_half;
- }
-}
-
-Matrix Animation::compute_matrix(const TimedKeyFrame &tkf, const Time::TimeDelta &dt) const
-{
- if(!dt)
- return tkf.keyframe->get_matrix();
- if(!tkf.prev)
- throw invalid_argument("Animation::compute_matrix");
- const TimedKeyFrame &prev = *tkf.prev;
-
- float t = dt/tkf.delta_t;
- float u = t*2.0f-1.0f;
-
- double matrix[16];
- const double *m1_data = prev.keyframe->get_matrix().data();
- const double *m2_data = tkf.keyframe->get_matrix().data();
- for(unsigned i=0; i<4; ++i)
- {
- const double *m1_col = m1_data+i*4;
- const double *m2_col = m2_data+i*4;
- double *out_col = matrix+i*4;
-
- if(i<3)
- {
- /* Linear interpolation will produce vectors that fall on the line
- between the two endpoints, and has a higher angular velocity near the
- middle. We compensate for the velocity by interpolating the angle
- around the halfway point and computing its tangent. This is
- approximated by a third degree polynomial, scaled so that the result
- will be in the range [-1, 1]. */
- float w = (tkf.axes[i].slope+(1-tkf.axes[i].slope)*u*u)*u*0.5f+0.5f;
-
- /* The interpolate vectors will also be shorter than unit length. At
- the halfway point the length will be equal to the cosine of half the
- angle, which was computed earlier. Use a second degree polynomial to
- approximate. */
- float n = (tkf.axes[i].scale+(1-tkf.axes[i].scale)*u*u);
-
- for(unsigned j=0; j<3; ++j)
- out_col[j] = ((1-w)*m1_col[j]+w*m2_col[j])/n;
- }
- else
- {
- for(unsigned j=0; j<3; ++j)
- out_col[j] = (1-t)*m1_col[j]+t*m2_col[j];
- }
- }
-
- matrix[3] = 0;
- matrix[7] = 0;
- matrix[11] = 0;
- matrix[15] = 1;
-
- return matrix;
-}
-
-
-Animation::AxisInterpolation::AxisInterpolation():
- slope(0),
- scale(0)
-{ }
-
-
-Animation::Iterator::Iterator(const Animation &a):
- animation(a),
- iter(animation.keyframes.begin()),
- end(false)
-{ }
-
-Animation::Iterator &Animation::Iterator::operator+=(const Time::TimeDelta &t)
-{
- time_since_keyframe += t;
- while(time_since_keyframe>iter->delta_t)
- {
- KeyFrameList::const_iterator next = iter;
- ++next;
- if(next==animation.keyframes.end())
- {
- if(animation.looping)
- next = animation.keyframes.begin();
- else
- {
- end = true;
- time_since_keyframe = iter->delta_t;
- break;
- }
- }
-
- time_since_keyframe -= iter->delta_t;
- iter = next;
- }
-
- return *this;
-}
-
-Matrix Animation::Iterator::get_matrix() const
-{
- return animation.compute_matrix(*iter, time_since_keyframe);
-}
-
-
-Animation::Loader::Loader(Animation &a):
- DataFile::CollectionObjectLoader<Animation>(a, 0)
-{
- init();
-}
-
-Animation::Loader::Loader(Animation &a, Collection &c):
- DataFile::CollectionObjectLoader<Animation>(a, &c)
-{
- init();
-}
-
-void Animation::Loader::init()
-{
- add("interval", &Loader::interval);
- add("keyframe", &Loader::keyframe);
- add("keyframe", &Loader::keyframe_inline);
- add("looping", &Animation::looping);
-}
-
-void Animation::Loader::keyframe(const string &n)
-{
- obj.add_keyframe(current_time, get_collection().get<KeyFrame>(n));
-}
-
-void Animation::Loader::keyframe_inline()
-{
- RefPtr<KeyFrame> kf = new KeyFrame;
- load_sub(*kf);
-
- TimedKeyFrame tkf;
- tkf.time = current_time;
- tkf.keyframe = kf;
- obj.prepare_keyframe(tkf);
- obj.keyframes.push_back(tkf);
-}
-
-void Animation::Loader::interval(float t)
-{
- current_time += t*Time::sec;
-}
-
-} // namespace GL
-} // namespace Msp
projects / libs / gl.git / blobdiff