From e7ed4d009636804d5dbe05aae9e7ab23b80fdd37 Mon Sep 17 00:00:00 2001
From: aap <aap@papnet.eu>
Date: Tue, 11 Jun 2019 08:59:28 +0200
Subject: added animation system (with skin support for now)

---
 src/animation/AnimBlendNode.cpp | 170 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 src/animation/AnimBlendNode.cpp

(limited to 'src/animation/AnimBlendNode.cpp')

diff --git a/src/animation/AnimBlendNode.cpp b/src/animation/AnimBlendNode.cpp
new file mode 100644
index 00000000..3d3d80ec
--- /dev/null
+++ b/src/animation/AnimBlendNode.cpp
@@ -0,0 +1,170 @@
+#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
-- 
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