1 files changed, 102 insertions, 0 deletions
diff --git a/smelt/glfw/smmath_priv.hpp b/smelt/glfw/smmath_priv.hpp
new file mode 100644
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--- /dev/null
+++ b/smelt/glfw/smmath_priv.hpp
@@ -0,0 +1,102 @@
+// -*- C++ -*-
+/*
+ * Simple MultimEdia LiTerator(SMELT)
+ * by Chris Xiong 2015
+ * Math header & implementation for the core
+ *
+ * WARNING: This library is in development and interfaces would be very
+ * unstable.
+ *
+ */
+#ifndef SMMATH_H
+#define SMMATH_H
+#include <cmath>
+#include <cstddef>
+#define sqr(x) ((x)*(x))
+#define EPS 1e-6
+#ifndef PI
+#define PI 3.14159265358979323846f
+#endif
+
+class _smMath
+{
+public:
+	static double deg2rad(double deg){return deg/180.*PI;}
+	static double rad2deg(double rad){return rad/PI*180.;}
+	static double clamprad(double a){while(a<0)a+=2*PI;while(a>2*PI)a-=2*PI;return a;}
+	static double clampdeg(double a){while(a<0)a+=360.;while(a>360)a-=360.;return a;}
+};
+
+class _smvec3d
+{
+public:
+	double x,y,z;
+	_smvec3d(double _x,double _y,double _z){x=_x;y=_y;z=_z;}
+	_smvec3d(){x=y=z=.0;}
+	double l(){return sqrt(sqr(x)+sqr(y)+sqr(z));}
+	void normalize(){double L=l();if(L<EPS)return;x/=L;y/=L;z/=L;}
+	_smvec3d getNormalized(){double L=l();if(L<EPS)return _smvec3d(0,0,0);return _smvec3d(x/L,y/L,z/L);}
+	friend _smvec3d operator -(_smvec3d a,_smvec3d b){return _smvec3d(a.x-b.x,a.y-b.y,a.z-b.z);}
+	friend _smvec3d operator +(_smvec3d a,_smvec3d b){return _smvec3d(a.x+b.x,a.y+b.y,a.z+b.z);}
+	friend double operator |(_smvec3d a,_smvec3d b){return a.x*b.x+a.y*b.y+a.z*b.z;}
+	friend _smvec3d operator *(_smvec3d a,_smvec3d b){return _smvec3d(a.y*b.z-a.z*b.y,a.z*b.x-a.x*b.z,a.x*b.y-a.y*b.x);}
+	friend _smvec3d operator *(double a,_smvec3d b){return _smvec3d(a*b.x,a*b.y,a*b.z);}
+	friend _smvec3d operator *(_smvec3d a,double b){return _smvec3d(b*a.x,b*a.y,b*a.z);}
+	friend double operator ^(_smvec3d a,_smvec3d b){return (a|b)/a.l()/b.l();}
+};
+
+class _smMatrix
+{
+public:
+	float m[16];
+	/* sf  0  1  2  3
+	 * 0  00 04 08 12
+	 * 1  01 05 09 13
+	 * 2  02 06 10 14
+	 * 3  03 07 11 15
+	 */
+	_smMatrix(){for(int i=0;i<16;++i)m[i]=.0;}
+	_smMatrix(const float* _m){memcpy(m,_m,sizeof(m));}
+	_smMatrix(const _smMatrix &copy){for(int i=0;i<16;++i)m[i]=copy.m[i];}
+	float* operator [](int s){if(s>=0&&s<4)return m+s*4;else return NULL;}
+	void clear(){for(int i=0;i<16;++i)m[i]=.0;}
+	void loadIdentity(){clear();m[0]=m[5]=m[10]=m[15]=1.;}
+	void translate(float x,float y,float z)
+	{
+		_smMatrix tmp;tmp.loadIdentity();
+		tmp.m[12]=x;tmp.m[13]=y;tmp.m[14]=z;
+		*this=*this*tmp;
+	}
+	void rotate(float a,float x,float y,float z)
+	{
+		if(_smvec3d(x,y,z).l()<=EPS)return;
+		if(fabsf(_smvec3d(x,y,z).l()-1)>EPS)
+		{
+			_smvec3d a(x,y,z);a.normalize();
+			x=a.x;y=a.y;z=a.z;
+		}
+		_smMatrix tmp;
+		float c=cosf(a),s=sinf(a);
+		tmp.m[ 0]=x*x*(1-c)+c;
+		tmp.m[ 4]=x*y*(1-c)-z*s;
+		tmp.m[ 8]=x*z*(1-c)+y*s;
+		tmp.m[ 1]=y*x*(1-c)+z*s;
+		tmp.m[ 5]=y*y*(1-c)+c;
+		tmp.m[ 9]=y*z*(1-c)-x*s;
+		tmp.m[ 2]=x*z*(1-c)-y*s;
+		tmp.m[ 6]=y*z*(1-c)+x*s;
+		tmp.m[10]=z*z*(1-c)+c;
+		tmp.m[15]=1;
+		*this=*this*tmp;
+	}
+	friend _smMatrix operator *(_smMatrix a,_smMatrix b)
+	{
+		_smMatrix ret;
+		for(int i=0;i<4;++i)
+		for(int j=0;j<4;++j)
+		for(int k=0;k<4;++k)
+			ret[j][i]+=a[k][i]*b[j][k];
+		return ret;
+	}
+};
+#endif