1 files changed, 245 insertions, 0 deletions

diff --git a/src/math/Matrix.h b/src/math/Matrix.h
new file mode 100644
index 00000000..cc15da09
--- /dev/null
+++ b/src/math/Matrix.h
@@ -0,0 +1,245 @@
+#pragma once
+
+class CMatrix
+{
+public:
+	RwMatrix m_matrix;
+	RwMatrix *m_attachment;
+	bool m_hasRwMatrix;	// are we the owner?
+
+	CMatrix(void){
+		m_attachment = nil;
+		m_hasRwMatrix = false;
+	}
+	CMatrix(CMatrix const &m){
+		m_attachment = nil;
+		m_hasRwMatrix = false;
+		*this = m;
+	}
+	CMatrix(RwMatrix *matrix, bool attach){
+		m_attachment = nil;
+		Attach(matrix, attach);
+	}
+	~CMatrix(void){
+		if(m_hasRwMatrix && m_attachment)
+			RwMatrixDestroy(m_attachment);
+	}
+	void Attach(RwMatrix *matrix, bool attach){
+		if(m_hasRwMatrix && m_attachment)
+			RwMatrixDestroy(m_attachment);
+		m_attachment = matrix;
+		m_hasRwMatrix = attach;
+		Update();
+	}
+	void AttachRW(RwMatrix *matrix, bool attach){
+		if(m_hasRwMatrix && m_attachment)
+			RwMatrixDestroy(m_attachment);
+		m_attachment = matrix;
+		m_hasRwMatrix = attach;
+		UpdateRW();
+	}
+	void Detach(void){
+		if(m_hasRwMatrix && m_attachment)
+			RwMatrixDestroy(m_attachment);
+		m_attachment = nil;
+	}
+	void Update(void){
+		m_matrix = *m_attachment;
+	}
+	void UpdateRW(void){
+		if(m_attachment){
+			*m_attachment = m_matrix;
+			RwMatrixUpdate(m_attachment);
+		}
+	}
+	void operator=(CMatrix const &rhs){
+		m_matrix = rhs.m_matrix;
+		if(m_attachment)
+			UpdateRW();
+	}
+
+	CVector *GetPosition(void){ return (CVector*)&m_matrix.pos; }
+	CVector *GetRight(void) { return (CVector*)&m_matrix.right; }
+	CVector *GetForward(void) { return (CVector*)&m_matrix.up; }
+	CVector *GetUp(void) { return (CVector*)&m_matrix.at; }
+	void SetScale(float s){
+		m_matrix.right.x = s;
+		m_matrix.right.y = 0.0f;
+		m_matrix.right.z = 0.0f;
+
+		m_matrix.up.x = 0.0f;
+		m_matrix.up.y = s;
+		m_matrix.up.z = 0.0f;
+
+		m_matrix.at.x = 0.0f;
+		m_matrix.at.y = 0.0f;
+		m_matrix.at.z = s;
+
+		m_matrix.pos.x = 0.0f;
+		m_matrix.pos.y = 0.0f;
+		m_matrix.pos.z = 0.0f;
+	}
+	void SetRotateXOnly(float angle){
+		float c = cos(angle);
+		float s = sin(angle);
+
+		m_matrix.right.x = 1.0f;
+		m_matrix.right.y = 0.0f;
+		m_matrix.right.z = 0.0f;
+
+		m_matrix.up.x = 0.0f;
+		m_matrix.up.y = c;
+		m_matrix.up.z = s;
+
+		m_matrix.at.x = 0.0f;
+		m_matrix.at.y = -s;
+		m_matrix.at.z = c;
+	}
+	void SetRotateX(float angle){
+		SetRotateXOnly(angle);
+		m_matrix.pos.x = 0.0f;
+		m_matrix.pos.y = 0.0f;
+		m_matrix.pos.z = 0.0f;
+	}
+	void SetRotateYOnly(float angle){
+		float c = cos(angle);
+		float s = sin(angle);
+
+		m_matrix.right.x = c;
+		m_matrix.right.y = 0.0f;
+		m_matrix.right.z = -s;
+
+		m_matrix.up.x = 0.0f;
+		m_matrix.up.y = 1.0f;
+		m_matrix.up.z = 0.0f;
+
+		m_matrix.at.x = s;
+		m_matrix.at.y = 0.0f;
+		m_matrix.at.z = c;
+	}
+	void SetRotateY(float angle){
+		SetRotateYOnly(angle);
+		m_matrix.pos.x = 0.0f;
+		m_matrix.pos.y = 0.0f;
+		m_matrix.pos.z = 0.0f;
+	}
+	void SetRotateZOnly(float angle){
+		float c = cos(angle);
+		float s = sin(angle);
+
+		m_matrix.right.x = c;
+		m_matrix.right.y = s;
+		m_matrix.right.z = 0.0f;
+
+		m_matrix.up.x = -s;
+		m_matrix.up.y = c;
+		m_matrix.up.z = 0.0f;
+
+		m_matrix.at.x = 0.0f;
+		m_matrix.at.y = 0.0f;
+		m_matrix.at.z = 1.0f;
+	}
+	void SetRotateZ(float angle){
+		SetRotateZOnly(angle);
+		m_matrix.pos.x = 0.0f;
+		m_matrix.pos.y = 0.0f;
+		m_matrix.pos.z = 0.0f;
+	}
+	void Reorthogonalise(void){
+		CVector &r = *GetRight();
+		CVector &f = *GetForward();
+		CVector &u = *GetUp();
+		u = CrossProduct(r, f);
+		u.Normalise();
+		r = CrossProduct(f, u);
+		r.Normalise();
+		f = CrossProduct(u, r);
+	}
+};
+
+inline CMatrix&
+Invert(const CMatrix &src, CMatrix &dst)
+{
+	// GTA handles this as a raw 4x4 orthonormal matrix
+	// and trashes the RW flags, let's not do that
+	// actual copy of librw code:
+	RwMatrix *d = &dst.m_matrix;
+	const RwMatrix *s = &src.m_matrix;
+	d->right.x = s->right.x;
+	d->right.y = s->up.x;
+	d->right.z = s->at.x;
+	d->up.x = s->right.y;
+	d->up.y = s->up.y;
+	d->up.z = s->at.y;
+	d->at.x = s->right.z;
+	d->at.y = s->up.z;
+	d->at.z = s->at.z;
+	d->pos.x = -(s->pos.x*s->right.x +
+	               s->pos.y*s->right.y +
+	               s->pos.z*s->right.z);
+	d->pos.y = -(s->pos.x*s->up.x +
+	               s->pos.y*s->up.y +
+	               s->pos.z*s->up.z);
+	d->pos.z = -(s->pos.x*s->at.x +
+	               s->pos.y*s->at.y +
+	               s->pos.z*s->at.z);
+	d->flags = rwMATRIXTYPEORTHONORMAL;
+	return dst;
+}
+
+inline CMatrix
+Invert(const CMatrix &matrix)
+{
+	CMatrix inv;
+	return Invert(matrix, inv);
+}
+
+inline CVector
+operator*(const CMatrix &mat, const CVector &vec)
+{
+	return CVector(
+		mat.m_matrix.right.x * vec.x + mat.m_matrix.up.x * vec.y + mat.m_matrix.at.x * vec.z + mat.m_matrix.pos.x,
+		mat.m_matrix.right.y * vec.x + mat.m_matrix.up.y * vec.y + mat.m_matrix.at.y * vec.z + mat.m_matrix.pos.y,
+		mat.m_matrix.right.z * vec.x + mat.m_matrix.up.z * vec.y + mat.m_matrix.at.z * vec.z + mat.m_matrix.pos.z);
+}
+
+inline CMatrix
+operator*(const CMatrix &m1, const CMatrix &m2)
+{
+	CMatrix out;
+	RwMatrix *dst = &out.m_matrix;
+	const RwMatrix *src1 = &m1.m_matrix;
+	const RwMatrix *src2 = &m2.m_matrix;
+	dst->right.x = src1->right.x*src2->right.x + src1->up.x*src2->right.y + src1->at.x*src2->right.z;
+	dst->right.y = src1->right.y*src2->right.x + src1->up.y*src2->right.y + src1->at.y*src2->right.z;
+	dst->right.z = src1->right.z*src2->right.x + src1->up.z*src2->right.y + src1->at.z*src2->right.z;
+	dst->up.x    = src1->right.x*src2->up.x    + src1->up.x*src2->up.y    + src1->at.x*src2->up.z;
+	dst->up.y    = src1->right.y*src2->up.x    + src1->up.y*src2->up.y    + src1->at.y*src2->up.z;
+	dst->up.z    = src1->right.z*src2->up.x    + src1->up.z*src2->up.y    + src1->at.z*src2->up.z;
+	dst->at.x    = src1->right.x*src2->at.x    + src1->up.x*src2->at.y    + src1->at.x*src2->at.z;
+	dst->at.y    = src1->right.y*src2->at.x    + src1->up.y*src2->at.y    + src1->at.y*src2->at.z;
+	dst->at.z    = src1->right.z*src2->at.x    + src1->up.z*src2->at.y    + src1->at.z*src2->at.z;
+	dst->pos.x   = src1->right.x*src2->pos.x   + src1->up.x*src2->pos.y   + src1->at.x*src2->pos.z + src1->pos.x;
+	dst->pos.y   = src1->right.y*src2->pos.x   + src1->up.y*src2->pos.y   + src1->at.y*src2->pos.z + src1->pos.y;
+	dst->pos.z   = src1->right.z*src2->pos.x   + src1->up.z*src2->pos.y   + src1->at.z*src2->pos.z + src1->pos.z;
+	return out;
+}
+
+inline CVector
+MultiplyInverse(const CMatrix &mat, const CVector &vec)
+{
+	CVector v(vec.x - mat.m_matrix.pos.x, vec.y - mat.m_matrix.pos.y, vec.z - mat.m_matrix.pos.z);
+	return CVector(
+		mat.m_matrix.right.x * v.x + mat.m_matrix.right.y * v.y + mat.m_matrix.right.z * v.z,
+		mat.m_matrix.up.x * v.x + mat.m_matrix.up.y * v.y + mat.m_matrix.up.z * v.z,
+		mat.m_matrix.at.x * v.x + mat.m_matrix.at.y * v.y + mat.m_matrix.at.z * v.z);
+}
+
+inline CVector
+Multiply3x3(const CMatrix &mat, const CVector &vec)
+{
+	return CVector(
+		mat.m_matrix.right.x * vec.x + mat.m_matrix.up.x * vec.y + mat.m_matrix.at.x * vec.z,
+		mat.m_matrix.right.y * vec.x + mat.m_matrix.up.y * vec.y + mat.m_matrix.at.y * vec.z,
+		mat.m_matrix.right.z * vec.x + mat.m_matrix.up.z * vec.y + mat.m_matrix.at.z * vec.z);
+}