calcscreen.cpp

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// 
//  The Code in this File has been taken from 
//  HLHack 1.3  by deltashark.
//  needed to avoid problems with mirror view
//  and TriAPI->WorldToScreen
// 
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>

#ifndef NULL
#define NULL ((void *)0)
#endif NULL
#define BOUND_VALUE(var,min,max) if((var)>(max)){(var)=(max);};if((var)<(min)){(var)=(min);}

#include "common/mathlib.h"
#include "engine/eiface.h"
#include "calcscreen.h"

float mainViewOrigin[3],mainViewAngles[3];
float displayCenterX=500, displayCenterY=350;

extern float fCurrentFOV;

// helper functions:
inline float VectorLength(const vec3_t v)
{
	return (float)sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]);
}


/* finds angle between two vectors */
inline float VectorAngle(const vec3_t a, const vec3_t b)
{
    float length_a = VectorLength(a);
	float length_b = VectorLength(b);
	float length_ab = length_a*length_b;
	if( length_ab==0.0 ){ return 0.0; }
	else                { return (float) (acos(DotProduct(a,b)/length_ab) * (180.f/M_PI)); }
}

/* takes pitch/yaw and makes a vector */
void MakeVector(const vec3_t ain, vec3_t vout)
{
	float pitch;
	float yaw;
	float tmp;		
	
	pitch = (float) (ain[0] * M_PI/180);
	yaw = (float) (ain[1] * M_PI/180);
	tmp = (float) cos(pitch);
	
	vout[0] = (float) (-tmp * -cos(yaw));
	vout[1] = (float) (sin(yaw)*tmp);
	vout[2] = (float) -sin(pitch);
}

void VectorRotateX(const vec3_t in, float angle, vec3_t out)
{
	float a,c,s;

	a = (float) (angle * M_PI/180);
	c = (float) cos(a);
	s = (float) sin(a);
	out[0] = in[0];
	out[1] = c*in[1] - s*in[2];
	out[2] = s*in[1] + c*in[2];	
}

void VectorRotateY(const vec3_t in, float angle, vec3_t out)
{
	float a,c,s;

	a = (float) (angle * M_PI/180);
	c = (float) cos(a);
	s = (float) sin(a);
	out[0] = c*in[0] + s*in[2];
	out[1] = in[1];
	out[2] = -s*in[0] + c*in[2];
}

void VectorRotateZ(const vec3_t in, float angle, vec3_t out)
{
	float a,c,s;

	a = (float) (angle * M_PI/180);
	c = (float) cos(a);
	s = (float) sin(a);
	out[0] = c*in[0] - s*in[1];
	out[1] = s*in[0] + c*in[1];
	out[2] = in[2];
}


int NewCalcScreen(float* in, float* out)
{
	vec3_t aim;
	vec3_t newaim;
	vec3_t view;
	vec3_t tmp;
	float num;

	if(!in||!out){ return false; }

	VectorSubtract(in,mainViewOrigin,aim);	
	MakeVector(mainViewAngles,view);	

	//not in fov#!@#!@$#@!$
	if (VectorAngle(view,aim) > (fCurrentFOV/1.8))
	{
		return false;
	}		
	
	VectorRotateZ(aim,-mainViewAngles[1],newaim);// yaw
	VectorRotateY(newaim,-mainViewAngles[0],tmp);// pitch
	VectorRotateX(tmp,-mainViewAngles[2],newaim);// roll
	
	//they are behind us!@~!#@!$@!$
	if (newaim[0] <= 0)
	{
		return false;
	}
	
	if(fCurrentFOV==0.0f){ return false; }
	num = (float)((displayCenterX/newaim[0])*(120.0/fCurrentFOV - 1.0/3.0));

	out[0] = displayCenterX - num*newaim[1];
	out[1] = displayCenterY - num*newaim[2];


	BOUND_VALUE(out[0],0,displayCenterX*2);
	BOUND_VALUE(out[1],0,displayCenterY*2);

	return true;
}