1 files changed, 109 insertions, 0 deletions

diff --git a/src/peds/PedIK.cpp b/src/peds/PedIK.cpp
new file mode 100644
index 00000000..b9baf49c
--- /dev/null
+++ b/src/peds/PedIK.cpp
@@ -0,0 +1,109 @@
+#include "common.h"
+#include "patcher.h"
+#include "PedIK.h"
+#include "Ped.h"
+
+WRAPPER bool CPedIK::PointGunInDirection(float phi, float theta) { EAXJMP(0x4ED9B0); }
+WRAPPER bool CPedIK::PointGunAtPosition(CVector *position) { EAXJMP(0x4ED920); }
+WRAPPER void CPedIK::ExtractYawAndPitchLocal(RwMatrixTag*, float*, float*) { EAXJMP(0x4ED2C0); }
+WRAPPER void CPedIK::ExtractYawAndPitchWorld(RwMatrixTag*, float*, float*) { EAXJMP(0x4ED140); }
+
+CPedIK::CPedIK(CPed *ped)
+{
+	m_ped = ped;
+	m_flags = 0;
+	m_headOrient.phi = 0.0f;
+	m_headOrient.theta = 0.0f;
+	m_torsoOrient.phi = 0.0f;
+	m_torsoOrient.theta = 0.0f;
+	m_upperArmOrient.phi = 0.0f;
+	m_upperArmOrient.theta = 0.0f;
+	m_lowerArmOrient.phi = 0.0f;
+	m_lowerArmOrient.theta = 0.0f;
+}
+
+void
+CPedIK::RotateTorso(AnimBlendFrameData *animBlend, LimbOrientation *limb, bool changeRoll)
+{
+	RwFrame *f = animBlend->frame;
+	RwMatrix *mat = CPedIK::GetWorldMatrix(RwFrameGetParent(f), RwMatrixCreate());
+
+	RwV3d upVector = { mat->right.z, mat->up.z, mat->at.z };
+	RwV3d rightVector;
+	RwV3d pos = RwFrameGetMatrix(f)->pos;
+
+	// rotation == 0 -> looking in y direction
+	// left? vector
+	float c = cos(m_ped->m_fRotationCur);
+	float s = sin(m_ped->m_fRotationCur);
+	rightVector.x = -(c*mat->right.x + s*mat->right.y);
+	rightVector.y = -(c*mat->up.x + s*mat->up.y);
+	rightVector.z = -(c*mat->at.x + s*mat->at.y);
+
+	if(changeRoll){
+		// Used when aiming only involves over the legs.(canAimWithArm)
+		// Automatically changes roll(forward rotation) axis of the parts above upper legs while moving, based on position of upper legs.
+		// Not noticeable in normal conditions...
+
+		RwV3d forwardVector;
+		CVector inversedForward = CrossProduct(CVector(0.0f, 0.0f, 1.0f), mat->up);
+		inversedForward.Normalise();
+		float dotProduct = DotProduct(mat->at, inversedForward);
+		if(dotProduct > 1.0f) dotProduct = 1.0f;
+		if(dotProduct < -1.0f) dotProduct = -1.0f;
+		float alpha = acos(dotProduct);
+
+		if(mat->at.z < 0.0f)
+			alpha = -alpha;
+
+		forwardVector.x = s * mat->right.x - c * mat->right.y;
+		forwardVector.y = s * mat->up.x - c * mat->up.y;
+		forwardVector.z = s * mat->at.x - c * mat->at.y;
+
+		float curYaw, curPitch;
+		CPedIK::ExtractYawAndPitchWorld(mat, &curYaw, &curPitch);
+		RwMatrixRotate(RwFrameGetMatrix(f), &rightVector, RADTODEG(limb->theta), rwCOMBINEPOSTCONCAT);
+		RwMatrixRotate(RwFrameGetMatrix(f), &upVector, RADTODEG(limb->phi - (curYaw - m_ped->m_fRotationCur)), rwCOMBINEPOSTCONCAT);
+		RwMatrixRotate(RwFrameGetMatrix(f), &forwardVector, RADTODEG(alpha), rwCOMBINEPOSTCONCAT);
+	}else{
+		// pitch
+		RwMatrixRotate(RwFrameGetMatrix(f), &rightVector, RADTODEG(limb->theta), rwCOMBINEPOSTCONCAT);
+		// yaw
+		RwMatrixRotate(RwFrameGetMatrix(f), &upVector, RADTODEG(limb->phi), rwCOMBINEPOSTCONCAT);
+	}
+	RwFrameGetMatrix(f)->pos = pos;
+	RwMatrixDestroy(mat);
+}
+
+void
+CPedIK::GetComponentPosition(RwV3d *pos, PedNode node)
+{
+	RwFrame *f;
+	RwMatrix *mat;
+
+	f = m_ped->GetNodeFrame(node);
+	mat = RwFrameGetMatrix(f);
+	*pos = mat->pos;
+
+	for (f = RwFrameGetParent(f); f; f = RwFrameGetParent(f))
+		RwV3dTransformPoints(pos, pos, 1, RwFrameGetMatrix(f));
+}
+
+RwMatrix*
+CPedIK::GetWorldMatrix(RwFrame *source, RwMatrix *destination)
+{
+	RwFrame *i;
+
+	*destination = *RwFrameGetMatrix(source);
+
+	for (i = RwFrameGetParent(source); i; i = RwFrameGetParent(i))
+		RwMatrixTransform(destination, RwFrameGetMatrix(i), rwCOMBINEPOSTCONCAT);
+
+	return destination;
+}
+
+STARTPATCHES
+	InjectHook(0x4ED0F0, &CPedIK::GetComponentPosition, PATCH_JUMP);
+	InjectHook(0x4ED060, &CPedIK::GetWorldMatrix, PATCH_JUMP);
+	InjectHook(0x4EDDB0, &CPedIK::RotateTorso, PATCH_JUMP);
+ENDPATCHES
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