From 1eb88d4f5d5cb05d62be1d4a0c88c7399f7c0de0 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Sat, 3 Feb 2018 00:55:26 +0800
Subject: Added the GL 3.2+ port. Fixed poor performance of the truetype
 renderer. (Partially) Fixed texture locking. Minor addition and fixes to the
 math library.

---
 smelt/glfw_m/smmath_priv.hpp | 165 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 smelt/glfw_m/smmath_priv.hpp

(limited to 'smelt/glfw_m/smmath_priv.hpp')

diff --git a/smelt/glfw_m/smmath_priv.hpp b/smelt/glfw_m/smmath_priv.hpp
new file mode 100644
index 0000000..90f0e2a
--- /dev/null
+++ b/smelt/glfw_m/smmath_priv.hpp
@@ -0,0 +1,165 @@
+// -*- 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 smvec2d
+{
+public:
+	float x,y;
+	smvec2d(float _x,float _y){x=_x;y=_y;}
+	smvec2d(){x=y=.0;}
+	float l(){return sqrtf(sqr(x)+sqr(y));}
+	void normalize(){float L=l();if(L<EPS)return;x/=L;y/=L;}
+	smvec2d getNormalized(){float L=l();if(L<EPS)return smvec2d(0,0);return smvec2d(x/L,y/L);}
+	void swap(){float t=x;x=y;y=t;}
+	void rotate(float rad){float tx=x*cosf(rad)+y*sinf(rad),ty=y*cosf(rad)-x*sinf(rad);x=tx,y=ty;}
+	smvec2d getRotate(float rad){float tx=x*cosf(rad)+y*sinf(rad),ty=y*cosf(rad)-x*sinf(rad);return smvec2d(tx,ty);}
+	friend smvec2d operator -(smvec2d a,smvec2d b){return smvec2d(a.x-b.x,a.y-b.y);}
+	friend smvec2d operator +(smvec2d a,smvec2d b){return smvec2d(a.x+b.x,a.y+b.y);}
+	friend float operator |(smvec2d a,smvec2d b){return a.x*b.x+a.y*b.y;}
+	friend float operator *(smvec2d a,smvec2d b){return a.x*b.y-b.x*a.y;}
+	friend smvec2d operator *(float a,smvec2d b){return smvec2d(a*b.x,a*b.y);}
+	friend smvec2d operator *(smvec2d a,float b){return smvec2d(b*a.x,b*a.y);}
+	friend float operator ^(smvec2d a,smvec2d b){return (a|b)/a.l()/b.l();}
+};
+
+class smvec3d
+{
+public:
+	float x,y,z;
+	smvec3d(float _x,float _y,float _z){x=_x;y=_y;z=_z;}
+	smvec3d(smvec2d a,float _z=.0){x=a.x;y=a.y;z=_z;}
+	smvec3d(){x=y=z=.0;}
+	float l(){return sqrtf(sqr(x)+sqr(y)+sqr(z));}
+	void normalize(){float L=l();if(L<EPS)return;x/=L;y/=L;z/=L;}
+	smvec3d getNormalized(){float 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 float 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 *(float a,smvec3d b){return smvec3d(a*b.x,a*b.y,a*b.z);}
+	friend smvec3d operator *(smvec3d a,float b){return smvec3d(b*a.x,b*a.y,b*a.z);}
+	friend float operator ^(smvec3d a,smvec3d b){return (a|b)/a.l()/b.l();}
+};
+
+class smvec4d
+{
+public:
+	float x,y,z,w;
+	smvec4d(float _x,float _y,float _z,float _w){x=_x;y=_y;z=_z;w=_w;}
+	smvec4d(smvec3d a,float _w=.0){x=a.x;y=a.y;z=a.z;w=_w;}
+	smvec4d(){x=y=z=w=.0;}
+	float l(){return sqrt(sqr(x)+sqr(y)+sqr(z)+sqr(w));}
+	void normalize(){float L=l();if(L<EPS)return;x/=L;y/=L;z/=L;w/=L;}
+	smvec4d getNormalized(){float L=l();if(L<EPS)return smvec4d(0,0,0,0);return smvec4d(x/L,y/L,z/L,w/L);}
+	friend smvec4d operator -(smvec4d a,smvec4d b){return smvec4d(a.x-b.x,a.y-b.y,a.z-b.z,a.w-b.w);}
+	friend smvec4d operator +(smvec4d a,smvec4d b){return smvec4d(a.x+b.x,a.y+b.y,a.z+b.z,a.w+b.w);}
+	friend float operator |(smvec4d a,smvec4d b){return a.x*b.x+a.y*b.y+a.z*b.z+a.w*b.w;}
+	//Note: this doesn't do a real 4D cross product.
+	friend smvec4d operator *(smvec4d a,smvec4d b){return smvec4d(a.y*b.z-a.z*b.y,a.z*b.x-a.x*b.z,a.x*b.y-a.y*b.x,1);}
+	friend smvec4d operator *(float a,smvec4d b){return smvec4d(a*b.x,a*b.y,a*b.z,a*b.w);}
+	friend smvec4d operator *(smvec4d a,float b){return smvec4d(b*a.x,b*a.y,b*a.z,b*a.w);}
+	friend float operator ^(smvec4d a,smvec4d 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;
+	}
+	void lookat(smvec3d eye,smvec3d at,smvec3d up)
+	{
+		smvec3d f=at-eye;f.normalize();up.normalize();
+		smvec3d s=f*up;smvec3d u=s.getNormalized()*f;
+		m[0]= s.x;m[4]= s.y;m[ 8]= s.z;m[12]=0;
+		m[1]= u.x;m[5]= u.y;m[ 9]= u.z;m[13]=0;
+		m[2]=-f.x;m[6]=-f.y;m[10]=-f.z;m[14]=0;
+		m[3]=   0;m[7]=   0;m[11]=   0;m[15]=1;
+	}
+	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;
+	}
+	friend smvec3d operator *(smMatrix a,smvec3d b)
+	{
+		return smvec3d(a[0][0]*b.x+a[1][0]*b.y+a[2][0]*b.z,
+		               a[0][1]*b.x+a[1][1]*b.y+a[2][1]*b.z,
+		               a[0][2]*b.x+a[1][2]*b.y+a[2][2]*b.z);
+	}
+	friend smvec4d operator *(smMatrix a,smvec4d b)
+	{
+		return smvec4d(a[0][0]*b.x+a[1][0]*b.y+a[2][0]*b.z+a[3][0]*b.w,
+		               a[0][1]*b.x+a[1][1]*b.y+a[2][1]*b.z+a[3][1]*b.w,
+		               a[0][2]*b.x+a[1][2]*b.y+a[2][2]*b.z+a[3][2]*b.w,
+		               a[0][3]*b.x+a[1][3]*b.y+a[2][3]*b.z+a[3][3]*b.w);
+	}
+};
+#endif
-- 
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