summaryrefslogtreecommitdiffstats
path: root/src/animation/AnimBlendNode.cpp
blob: 3d3d80ec597d9fb13440008c0bf0e24a9181806f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
#include "common.h"
#include "patcher.h"
#include "AnimBlendAssociation.h"
#include "AnimBlendNode.h"

void 
CAnimBlendNode::Init(void)
{
	frameA = 0;
	frameB = 0;
	remainingTime = 0.0f;
	sequence = nil;
	association = nil;
}

bool
CAnimBlendNode::Update(CVector &trans, CQuaternion &rot, float weight)
{
	bool looped = false;

	trans = CVector(0.0f, 0.0f, 0.0f);
	rot = CQuaternion(0.0f, 0.0f, 0.0f, 0.0f);

	if(association->IsRunning()){
		remainingTime -= association->timeStep;
		if(remainingTime <= 0.0f)
			looped = NextKeyFrame();
	}

	float blend = association->GetBlendAmount(weight);
	if(blend > 0.0f){
		KeyFrameTrans *kfA = (KeyFrameTrans*)sequence->GetKeyFrame(frameA);
		KeyFrameTrans *kfB = (KeyFrameTrans*)sequence->GetKeyFrame(frameB);
		float t = kfA->deltaTime == 0.0f ? 0.0f : (kfA->deltaTime - remainingTime)/kfA->deltaTime;
		if(sequence->type & CAnimBlendSequence::KF_TRANS){
			trans = kfB->translation + t*(kfA->translation - kfB->translation);
			trans *= blend;
		}
		if(sequence->type & CAnimBlendSequence::KF_ROT){
			rot.Slerp(kfB->rotation, kfA->rotation, theta, invSin, t);
			rot *= blend;
		}
	}

	return looped;
}

bool
CAnimBlendNode::NextKeyFrame(void)
{
	bool looped;

	if(sequence->numFrames <= 1)
		return false;

	looped = false;
	frameB = frameA;

	// Advance as long as we have to
	while(remainingTime <= 0.0f){
		frameA++;

		if(frameA >= sequence->numFrames){
			// reached end of animation
			if(!association->IsRepeating()){
				frameA--;
				remainingTime = 0.0f;
				return false;
			}
			looped = true;
			frameA = 0;
		}

		remainingTime += sequence->GetKeyFrame(frameA)->deltaTime;
	}

	frameB = frameA - 1;
	if(frameB < 0)
		frameB += sequence->numFrames;

	CalcDeltas();
	return looped;
}

// Set animation to time t
bool
CAnimBlendNode::FindKeyFrame(float t)
{
	if(sequence->numFrames < 1)
		return false;

	frameA = 0;
	frameB = frameA;

	if(sequence->numFrames >= 2){
		frameA++;

		// advance until t is between frameB and frameA
		while(t > sequence->GetKeyFrame(frameA)->deltaTime){
			t -= sequence->GetKeyFrame(frameA)->deltaTime;
			frameB = frameA++;
			if(frameA >= sequence->numFrames){
				// reached end of animation
				if(!association->IsRepeating())
					return false;
				frameA = 0;
				frameB = 0;
			}
		}

		remainingTime = sequence->GetKeyFrame(frameA)->deltaTime - t;
	}

	CalcDeltas();
	return true;
}

void
CAnimBlendNode::CalcDeltas(void)
{
	if((sequence->type & CAnimBlendSequence::KF_ROT) == 0)
		return;
	KeyFrame *kfA = sequence->GetKeyFrame(frameA);
	KeyFrame *kfB = sequence->GetKeyFrame(frameB);
	float cos = DotProduct(kfA->rotation, kfB->rotation);
	if(cos > 1.0f)
		cos = 1.0f;
	theta = acos(cos);
	invSin = theta == 0.0f ?  0.0f : 1.0f/sin(theta);
}

void
CAnimBlendNode::GetCurrentTranslation(CVector &trans, float weight)
{
	trans = CVector(0.0f, 0.0f, 0.0f);

	float blend = association->GetBlendAmount(weight);
	if(blend > 0.0f){
		KeyFrameTrans *kfA = (KeyFrameTrans*)sequence->GetKeyFrame(frameA);
		KeyFrameTrans *kfB = (KeyFrameTrans*)sequence->GetKeyFrame(frameB);
		float t = (kfA->deltaTime - remainingTime)/kfA->deltaTime;
		if(sequence->type & CAnimBlendSequence::KF_TRANS){
			trans = kfB->translation + t*(kfA->translation - kfB->translation);
			trans *= blend;
		}
	}
}

void
CAnimBlendNode::GetEndTranslation(CVector &trans, float weight)
{
	trans = CVector(0.0f, 0.0f, 0.0f);

	float blend = association->GetBlendAmount(weight);
	if(blend > 0.0f){
		KeyFrameTrans *kf = (KeyFrameTrans*)sequence->GetKeyFrame(sequence->numFrames-1);
		if(sequence->type & CAnimBlendSequence::KF_TRANS)
			trans = kf->translation * blend;
	}
}

STARTPATCHES
	InjectHook(0x401B10, &CAnimBlendNode::Init, PATCH_JUMP);
	InjectHook(0x401B30, &CAnimBlendNode::Update, PATCH_JUMP);
	InjectHook(0x401DC0, &CAnimBlendNode::NextKeyFrame, PATCH_JUMP);
	InjectHook(0x4021B0, &CAnimBlendNode::FindKeyFrame, PATCH_JUMP);
	InjectHook(0x401E70, &CAnimBlendNode::CalcDeltas, PATCH_JUMP);
	InjectHook(0x401FE0, &CAnimBlendNode::GetCurrentTranslation, PATCH_JUMP);
	InjectHook(0x402110, &CAnimBlendNode::GetEndTranslation, PATCH_JUMP);
ENDPATCHES