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/* Copyright (C) 2021 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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.
*
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Raw description of a skeleton animation
*/
#include "precompiled.h"
#include "SkeletonAnimDef.h"
#include "maths/MathUtil.h"
#include "maths/Matrix3D.h"
#include "ps/CStr.h"
#include "ps/CLogger.h"
#include "ps/FileIo.h"
namespace
{
// Start IDs at 1 to leave 0 as a special value.
u32 g_NextSkeletonDefUID = 1;
}
///////////////////////////////////////////////////////////////////////////////////////////
// CSkeletonAnimDef constructor
CSkeletonAnimDef::CSkeletonAnimDef() : m_FrameTime(0), m_NumKeys(0), m_NumFrames(0)
{
m_UID = g_NextSkeletonDefUID++;
// Log a warning if we ever overflow. Should that not result from a bug, bumping to u64 ought to suffice.
if (g_NextSkeletonDefUID == 0)
{
// Reset to 1.
g_NextSkeletonDefUID++;
LOGWARNING("CSkeletonAnimDef unique ID overflowed to 0 - model-animation bounds may be incorrect.");
}
}
///////////////////////////////////////////////////////////////////////////////////////////
// CSkeletonAnimDef destructor
CSkeletonAnimDef::~CSkeletonAnimDef()
{
}
///////////////////////////////////////////////////////////////////////////////////////////
// BuildBoneMatrices: build matrices for all bones at the given time (in MS) in this
// animation
void CSkeletonAnimDef::BuildBoneMatrices(float time, CMatrix3D* matrices, bool loop) const
{
float fstartframe = time/m_FrameTime;
size_t startframe = (size_t)(int)(time/m_FrameTime);
float deltatime = fstartframe-startframe;
startframe %= m_NumFrames;
size_t endframe = startframe + 1;
endframe %= m_NumFrames;
if (!loop && endframe == 0)
{
// This might be something like a death animation, and interpolating
// between the final frame and the initial frame is wrong, because they're
// totally different. So if we've looped around to endframe==0, just display
// the animation's final frame with no interpolation.
for (size_t i = 0; i < m_NumKeys; i++)
{
const Key& key = GetKey(startframe, i);
matrices[i].SetIdentity();
matrices[i].Rotate(key.m_Rotation);
matrices[i].Translate(key.m_Translation);
}
}
else
{
for (size_t i = 0; i < m_NumKeys; i++)
{
const Key& startkey = GetKey(startframe, i);
const Key& endkey = GetKey(endframe, i);
CVector3D trans = Interpolate(startkey.m_Translation, endkey.m_Translation, deltatime);
// TODO: is slerp the best thing to use here?
CQuaternion rot;
rot.Slerp(startkey.m_Rotation, endkey.m_Rotation, deltatime);
rot.ToMatrix(matrices[i]);
matrices[i].Translate(trans);
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////
// Load: try to load the anim from given file; return a new anim if successful
std::unique_ptr<CSkeletonAnimDef> CSkeletonAnimDef::Load(const VfsPath& filename)
{
CFileUnpacker unpacker;
unpacker.Read(filename,"PSSA");
// check version
if (unpacker.GetVersion()<FILE_READ_VERSION) {
throw PSERROR_File_InvalidVersion();
}
// unpack the data
auto anim = std::make_unique<CSkeletonAnimDef>();
try {
CStr name; // unused - just here to maintain compatibility with the animation files
unpacker.UnpackString(name);
unpacker.UnpackRaw(&anim->m_FrameTime,sizeof(anim->m_FrameTime));
anim->m_NumKeys = unpacker.UnpackSize();
anim->m_NumFrames = unpacker.UnpackSize();
anim->m_Keys.resize(anim->m_NumKeys*anim->m_NumFrames);
unpacker.UnpackRaw(anim->m_Keys.data(), anim->m_Keys.size() * sizeof(decltype(anim->m_Keys)::value_type));
} catch (PSERROR_File&) {
anim.reset();
throw;
}
return anim;
}
///////////////////////////////////////////////////////////////////////////////////////////
// Save: try to save anim to file
void CSkeletonAnimDef::Save(const VfsPath& pathname, const CSkeletonAnimDef& anim)
{
CFilePacker packer(FILE_VERSION, "PSSA");
// pack up all the data
packer.PackString("");
packer.PackRaw(&anim.m_FrameTime,sizeof(anim.m_FrameTime));
const size_t numKeys = anim.m_NumKeys;
packer.PackSize(numKeys);
const size_t numFrames = anim.m_NumFrames;
packer.PackSize(numFrames);
packer.PackRaw(anim.m_Keys.data(), anim.m_Keys.size() * sizeof(decltype(anim.m_Keys)::value_type));
// now write it
packer.Write(pathname);
}
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