//Copyright 2012-2017 <>< Charles Lohr
//You may license this file under the MIT/x11, NewBSD, or any GPL license.

//This is a series of tools useful for software rendering.
//Use of this file with OpenGL is untested.

#ifndef _3D_H
#define _3D_H

#include <math.h>
#define tdCOS cosf
#define tdSIN sinf
#define tdTAN tanf
#define tdSQRT sqrtf
#define tdMATCOPY(x,y) memcpy( x, y, 16*sizeof(float))
#define tdQ_PI 3.141592653589
#define tdDEGRAD (tdQ_PI/180.)
#define tdRADDEG (180./tdQ_PI)

#ifndef CN_EXPORT
#if defined(_WIN32) && !defined(TCC)
#define CN_EXPORT __declspec(dllexport)
#else
#define CN_EXPORT __attribute__((visibility("default")))
#endif
#endif

//General Matrix Functions
CN_EXPORT void tdIdentity(float *f);
CN_EXPORT void tdZero(float *f);
CN_EXPORT void tdTranslate(float *f, float x, float y, float z);			 // Operates ON f
CN_EXPORT void tdScale(float *f, float x, float y, float z);				 // Operates ON f
CN_EXPORT void tdRotateAA(float *f, float angle, float x, float y, float z); // Operates ON f
CN_EXPORT void tdRotateEA(float *f, float x, float y, float z);				 // Operates ON f
CN_EXPORT void tdMultiply(float *fin1, float *fin2, float *fout);			 // Operates ON f
CN_EXPORT void tdPrint(float *f);
CN_EXPORT void tdTransposeSelf(float *f);

//Specialty Matrix Functions
CN_EXPORT void tdPerspective(float fovy, float aspect, float zNear, float zFar,
							 float *out);							 // Sets, NOT OPERATES. (FOVX=degrees)
CN_EXPORT void tdLookAt(float *m, float *eye, float *at, float *up); // Operates ON f

//General point functions
#define tdPSet( f, x, y, z ) { f[0] = x; f[1] = y; f[2] = z; }
CN_EXPORT void tdPTransform(const float *pin, float *f, float *pout);
CN_EXPORT void tdVTransform(const float *vin, float *f, float *vout);
CN_EXPORT void td4Transform(float *kin, float *f, float *kout);
CN_EXPORT void td4RTransform(float *kin, float *f, float *kout);
CN_EXPORT void tdNormalizeSelf(float *vin);
CN_EXPORT void tdCross(float *va, float *vb, float *vout);
float tdDistance( float * va, float * vb );
float tdDot( float * va, float * vb );
#define tdPSub( x, y, z ) { (z)[0] = (x)[0] - (y)[0]; (z)[1] = (x)[1] - (y)[1]; (z)[2] = (x)[2] - (y)[2]; }
#define tdPAdd( x, y, z ) { (z)[0] = (x)[0] + (y)[0]; (z)[1] = (x)[1] + (y)[1]; (z)[2] = (x)[2] + (y)[2]; }

//Stack Functionality
#define tdMATRIXMAXDEPTH 32
CN_EXPORT extern float *gSMatrix;
CN_EXPORT void tdPush();
CN_EXPORT void tdPop();
CN_EXPORT void tdMode(int mode);
#define tdMODELVIEW 0
#define tdPROJECTION 1

//Final stage tools
CN_EXPORT void tdSetViewport(float leftx, float topy, float rightx, float bottomy, float pixx, float pixy);
CN_EXPORT void tdFinalPoint(float *pin, float *pout);

CN_EXPORT float tdFLerp(float a, float b, float t);
CN_EXPORT float tdPerlin2D(float x, float y);

#endif