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Animation.cpp
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//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License (MIT).
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
// Developed by Minigraph
//
// Author: James Stanard
//
#include "Animation.h"
#include "Model.h"
#include "../Core/Utility.h"
#include "../Core/Math/Common.h"
#include "../Core/Math/Quaternion.h"
using Math::Quaternion;
using Math::Vector4;
static inline float ToFloat(const int8_t x) { return Math::Max(x / 127.0f, -1.0f); }
static inline float ToFloat(const uint8_t x) { return x / 255.0f; }
static inline float ToFloat(const int16_t x) { return Math::Max(x / 32767.0f, -1.0f); }
static inline float ToFloat(const uint16_t x) { return x / 65535.0f; }
static inline void Lerp3(float* Dest, const float* Key1, const float* Key2, float T)
{
Dest[0] = Math::Lerp(Key1[0], Key2[0], T);
Dest[1] = Math::Lerp(Key1[1], Key2[1], T);
Dest[2] = Math::Lerp(Key1[2], Key2[2], T);
}
template <typename T>
static inline Quaternion ToQuat(const T* rot)
{
return (Quaternion)Vector4(ToFloat(rot[0]), ToFloat(rot[1]), ToFloat(rot[2]), ToFloat(rot[3]));
}
static inline Quaternion ToQuat(const float* rot)
{
return Quaternion(XMLoadFloat4((const XMFLOAT4*)rot));
}
static inline void Slerp(float* Dest, const void* Key1, const void* Key2, float T, uint32_t Format)
{
switch (Format)
{
case AnimationCurve::kSNorm8:
{
const int8_t* key1 = (const int8_t*)Key1;
const int8_t* key2 = (const int8_t*)Key2;
XMStoreFloat4((XMFLOAT4*)Dest, (FXMVECTOR)Math::Slerp(ToQuat(key1), ToQuat(key2), T));
break;
}
case AnimationCurve::kUNorm8:
{
const uint8_t* key1 = (const uint8_t*)Key1;
const uint8_t* key2 = (const uint8_t*)Key2;
XMStoreFloat4((XMFLOAT4*)Dest, (FXMVECTOR)Math::Slerp(ToQuat(key1), ToQuat(key2), T));
break;
}
case AnimationCurve::kSNorm16:
{
const int16_t* key1 = (const int16_t*)Key1;
const int16_t* key2 = (const int16_t*)Key2;
XMStoreFloat4((XMFLOAT4*)Dest, (FXMVECTOR)Math::Slerp(ToQuat(key1), ToQuat(key2), T));
break;
}
case AnimationCurve::kUNorm16:
{
const uint16_t* key1 = (const uint16_t*)Key1;
const uint16_t* key2 = (const uint16_t*)Key2;
XMStoreFloat4((XMFLOAT4*)Dest, (FXMVECTOR)Math::Slerp(ToQuat(key1), ToQuat(key2), T));
break;
}
case AnimationCurve::kFloat:
{
const float* key1 = (const float*)Key1;
const float* key2 = (const float*)Key2;
XMStoreFloat4((XMFLOAT4*)Dest, (FXMVECTOR)Math::Slerp(ToQuat(key1), ToQuat(key2), T));
break;
}
default:
ASSERT(0, "Unexpected animation key frame data format");
break;
}
}
void ModelInstance::UpdateAnimations(float deltaTime)
{
uint32_t NumAnimations = m_Model->m_NumAnimations;
GraphNode* animGraph = m_AnimGraph.get();
for (uint32_t i = 0; i < NumAnimations; ++i)
{
AnimationState& anim = m_AnimState[i];
if (anim.state == AnimationState::kStopped)
continue;
anim.time += deltaTime;
const AnimationSet& animation = m_Model->m_Animations[i];
if (anim.state == AnimationState::kLooping)
{
anim.time = fmodf(anim.time, animation.duration);
}
else if (anim.time > animation.duration)
{
anim.time = 0.0f;
anim.state = AnimationState::kStopped;
}
const AnimationCurve* firstCurve = m_Model->m_CurveData.get() + animation.firstCurve;
// Update animation nodes
for (uint32_t j = 0; j < animation.numCurves; ++j)
{
const AnimationCurve& curve = firstCurve[j];
ASSERT(curve.numSegments > 0);
const float progress = Math::Clamp((anim.time - curve.startTime) * curve.rangeScale, 0.0f, curve.numSegments);
const uint32_t segment = (uint32_t)progress;
const float lerpT = progress - (float)segment;
const size_t stride = curve.keyFrameStride * 4;
const byte* key1 = m_Model->m_KeyFrameData.get() + curve.keyFrameOffset + stride * segment;
const byte* key2 = key1 + stride;
GraphNode& node = animGraph[curve.targetNode];
switch (curve.targetPath)
{
case AnimationCurve::kTranslation:
ASSERT(curve.keyFrameFormat == AnimationCurve::kFloat);
Lerp3((float*)&node.xform + 12, (const float*)key1, (const float*)key2, lerpT);
break;
case AnimationCurve::kRotation:
node.staleMatrix = true;
Slerp((float*)&node.rotation, key1, key2, lerpT, curve.keyFrameFormat);
break;
case AnimationCurve::kScale:
ASSERT(curve.keyFrameFormat == AnimationCurve::kFloat);
node.staleMatrix = true;
Lerp3((float*)&node.scale, (const float*)key1, (const float*)key2, lerpT);
break;
default:
case AnimationCurve::kWeights:
ASSERT(0, "Unhandled blend shape weights in animation");
break;
}
}
}
}
void ModelInstance::PlayAnimation(uint32_t animIdx, bool loop)
{
if (animIdx < m_AnimState.size())
m_AnimState[animIdx].state = loop ? AnimationState::kLooping : AnimationState::kPlaying;
}
void ModelInstance::PauseAnimation(uint32_t animIdx)
{
if (animIdx < m_AnimState.size())
m_AnimState[animIdx].state = AnimationState::kStopped;
}
void ModelInstance::ResetAnimation(uint32_t animIdx)
{
if (animIdx >= m_AnimState.size())
m_AnimState[animIdx].time = 0.0f;
}
void ModelInstance::StopAnimation(uint32_t animIdx)
{
if (animIdx >= m_AnimState.size())
{
m_AnimState[animIdx].state = AnimationState::kStopped;
m_AnimState[animIdx].time = 0.0f;
}
}
void ModelInstance::LoopAllAnimations(void)
{
for (auto& anim : m_AnimState)
{
anim.state = AnimationState::kLooping;
anim.time = 0.0f;
}
}