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/* ResidualVM - A 3D game interpreter
*
* ResidualVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the AUTHORS
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "engines/stark/model/animhandler.h"
#include "engines/stark/model/model.h"
#include "engines/stark/model/skeleton_anim.h"
namespace Stark {
AnimHandler::AnimHandler() :
_model(nullptr),
_anim(nullptr),
_animTime(-1),
_previousAnim(nullptr),
_previousAnimTime(-1),
_blendAnim(nullptr),
_blendAnimTime(-1),
_blendTimeRemaining(0)
{
}
AnimHandler::~AnimHandler() {
}
void AnimHandler::setAnim(SkeletonAnim *anim) {
if (_anim == anim) {
return;
}
if (_previousAnim) {
if (_previousAnim != anim) {
// Start blending the new animation up with the previous one
startBlending();
} else {
// The previous animation is the same as the one last used for rendering
// Stop blending in case it was started by another anim change since the last frame
stopBlending();
}
}
_anim = anim;
_animTime = 0;
}
void AnimHandler::setModel(Model *model) {
_model = model;
}
void AnimHandler::setNode(uint32 time, BoneNode *bone, const BoneNode *parent) {
const Common::Array<BoneNode *> &bones = _model->getBones();
if (_blendTimeRemaining <= 0) {
_anim->getCoordForBone(time, bone->_idx, bone->_animPos, bone->_animRot);
} else {
// Blend the coordinates of the previous and the current animation
Math::Vector3d previousAnimPos, animPos;
Math::Quaternion previousAnimRot, animRot;
_blendAnim->getCoordForBone(_blendAnimTime, bone->_idx, previousAnimPos, previousAnimRot);
_anim->getCoordForBone(time, bone->_idx, animPos, animRot);
float blendingRatio = 1.0 - _blendTimeRemaining / (float)_blendDuration;
bone->_animPos = previousAnimPos + (animPos - previousAnimPos) * blendingRatio;
bone->_animRot = previousAnimRot.slerpQuat(animRot, blendingRatio);
}
if (parent) {
parent->_animRot.transform(bone->_animPos);
bone->_animPos = parent->_animPos + bone->_animPos;
bone->_animRot = parent->_animRot * bone->_animRot;
}
for (uint i = 0; i < bone->_children.size(); ++i) {
setNode(time, bones[bone->_children[i]], bone);
}
}
void AnimHandler::animate(uint32 time) {
int32 deltaTime = time - _animTime;
if (deltaTime < 0 || time > _blendDuration / 2) {
deltaTime = 33;
}
// Store the last anim that was actually used for rendering
_previousAnim = _anim;
_previousAnimTime = time;
updateBlending(deltaTime);
// Start at root bone
// For each child
// - Set childs animation coordinate
// - Process that childs children
const Common::Array<BoneNode *> &bones = _model->getBones();
if (deltaTime >= 0) {
setNode(time, bones[0], nullptr);
_animTime = time;
}
}
void AnimHandler::startBlending() {
_blendTimeRemaining = _blendDuration;
_blendAnim = _previousAnim;
_blendAnimTime = _previousAnimTime;
}
void AnimHandler::updateBlending(int32 deltaTime) {
_blendTimeRemaining -= deltaTime;
if (_blendTimeRemaining > 0) {
// If we are blending, also update the previous animation's time
_blendAnimTime += deltaTime;
if (_blendAnimTime >= (int32) _blendAnim->getLength()) {
_blendAnimTime = _blendAnim->getLength() - 1;
}
} else {
// Otherwise make sure blending is not enabled
stopBlending();
}
}
void AnimHandler::stopBlending() {
_blendAnim = nullptr;
_blendAnimTime = -1;
_blendTimeRemaining = 0;
}
void AnimHandler::resetBlending() {
stopBlending();
_previousAnim = nullptr;
_previousAnimTime = -1;
}
} // End of namespace Stark
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