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[Prizm] Asteroids
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 25 Apr 2012 07:45:31 pm    Post subject: [Prizm] Asteroids
Hey all. I am wanting to make this into Prizm C (C for the Prizm) and have this basic code as an outline for an Asteroids clone. This is a computer C project but I wanted the Prizm to see it also. I just need some help translating the code. If you help considerably you will be in the credits. Here is the code:

Code:

#include <stdio.h>
#include <math.h>
#include <graphics.h>
#include <conio.h>
#include <dos.h>
typedef struct
  {
  float x, y;    // 2D coordinates, a float so we can store fractional values
  } POINT;
typedef struct
  {
  int    NumPoints;
  POINT  Point[ 3 ];   // Three is enough for now but will have to make
  } SHAPE;             // this more flexible later.
typedef struct
  {
  POINT  Loc;             // Location on the screen
  int    ViewAngle;       // Angle at which the object is facing
  POINT  Direction;       // Direction which the object is moving, in pixels
  SHAPE  Shape;           // The shape of the object
  SHAPE  Screen;          // Actual points it occupies on the screen
  } OBJECT;
struct
  {
  OBJECT Ship;            // The players spaceship
  } g;
// Translates a point by rotating it (using simple trig).
void TranslatePoint( POINT *Dest, POINT *Src, int Angle )
  {
  double Radians;
  Radians = Angle * 0.01745;
  Dest->x = Src->x * cos( Radians ) - Src->y * sin( Radians );
  Dest->y = Src->x * sin( Radians ) + Src->y * cos( Radians );
  }
// Translates an object's relative coordinates to actual
// screen coordinates.
void TranslateObject( OBJECT *Object )
  {
  int i;
  for( i = 0; i < Object->Shape.NumPoints; i++ )
    {
    // First, account for rotation
    TranslatePoint( &Object->Screen.Point[ i ], &Object->Shape.Point[ i ], Object->ViewAngle );
    // Now make it relative to the screen location
    Object->Screen.Point[ i ].x += Object->Loc.x;
    Object->Screen.Point[ i ].y += Object->Loc.y;
    }
  }
// Goes through the list of points in an object
// and connects them all with lines.
void DrawObject( OBJECT *Object )
  {
  int i;
  for( i = 1; i < Object->Shape.NumPoints; i++ )
    {
    line( Object->Screen.Point[ i - 1 ].x, Object->Screen.Point[ i - 1 ].y,
          Object->Screen.Point[ i     ].x, Object->Screen.Point[ i     ].y );
    }
  line( Object->Screen.Point[ i - 1 ].x, Object->Screen.Point[ i - 1 ].y,
        Object->Screen.Point[ 0     ].x, Object->Screen.Point[ 0     ].y );
  }
// Moves an object along its direction.
void MoveObject( OBJECT *Object )
  {
  Object->Loc.x += Object->Direction.x;
  Object->Loc.y += Object->Direction.y;
  // Handle screen wrap-around
  if( Object->Loc.x < 0 )    Object->Loc.x = Object->Loc.x + 640;
  if( Object->Loc.x > 639 )  Object->Loc.x = Object->Loc.x - 640;
  if( Object->Loc.y < 0 )    Object->Loc.y = Object->Loc.y + 480;
  if( Object->Loc.y > 479 )  Object->Loc.y = Object->Loc.y - 480;
  }
// This routine just waits until the display is
// in a vertical retrace cycle.  This is useful
// for two things: to perform drawing during retrace
// when it can't be seen and (more importantly)
// to provide a method of synchronizing the animation
// with the game play so that it runs at a constant
// speed on virtually every machine.
void SyncToVerticalRetrace( void )
  {
  // If we happen to be in the middle of a vertical retrace
  // period wait until its over.
  while( inp( 0x3da ) & 8 )
    ;
  // Wait until we begin vertical retrace.
  while( !(inp( 0x3da ) & 8) )
    ;
  }
#define ROTATE_STEP  3       // Number of degrees to rotate
#define SPEED        0.12    // Speed control
#define FRICTION     0.995   // Speed reduction per frame
void Supervisor( void )
  {
  unsigned short KeyboardStatus;
  int c = 0, EraseFlag = 1, Color = WHITE;
  while( c != 'q' && c != 'Q' )
    {
    TranslateObject( &g.Ship );
    DrawObject( &g.Ship );   // Draw the ship
    // Get the keyboard status bits from the BIOS data area
    KeyboardStatus = *(unsigned short far *)MK_FP( 0x40, 0x17 );
    MoveObject( &g.Ship );
    // Simulate friction.
    g.Ship.Direction.x *= FRICTION;
    g.Ship.Direction.y *= FRICTION;
    // If a real keystroke is waiting get it
    if( kbhit() )
      {
      c = getch();
      if( c == 'e' || c == 'E' )
        {
        EraseFlag = !EraseFlag;    // Toggle erase flag
        }
      }
    if( KeyboardStatus & 0x0002 )    // left shift, rotate left
      {
      g.Ship.ViewAngle -= ROTATE_STEP;
      if( g.Ship.ViewAngle < 0 )  g.Ship.ViewAngle = 360 - ROTATE_STEP;
      }
    if( KeyboardStatus & 0x0001 )    // right shift, rotate right
      {
      g.Ship.ViewAngle += ROTATE_STEP;
      if( g.Ship.ViewAngle > 359 )  g.Ship.ViewAngle = 0 + ROTATE_STEP;
      }
    if( KeyboardStatus & 0x4000 )    // shift-lock, fire
      {
      // Not supported yet.
      }
    if( KeyboardStatus & 0x0008 )    // alt, thrust
      {
      double Radians;
      Radians = g.Ship.ViewAngle * 0.01745;
      g.Ship.Direction.x += sin( Radians ) * SPEED;
      g.Ship.Direction.y -= cos( Radians ) * SPEED;
      }
    SyncToVerticalRetrace();     // Pause until vertical retrace
    if( EraseFlag )  DrawObject( &g.Ship );    // Erase the ship
    if( c == 'c' || c == 'C' )   // Change color
      {
      Color ^= (WHITE ^ LIGHTGREEN);
      setcolor( Color );
      c = 0;
      }
    }
  }
// Initialization code.
void Init( void )
  {
  int GraphicsDriver = VGA;     // assume VGA graphics card
  int GraphicsMode = VGAHI;     // use VGA 640x480 16 color mode
  initgraph( &GraphicsDriver, &GraphicsMode, NULL );
  setwritemode( XOR_PUT );
  g.Ship.Shape.NumPoints = 3;
  g.Ship.Shape.Point[ 0 ].x =   0;
  g.Ship.Shape.Point[ 0 ].y = -16;
  g.Ship.Shape.Point[ 1 ].x =  -8;
  g.Ship.Shape.Point[ 1 ].y =  +8;
  g.Ship.Shape.Point[ 2 ].x =  +8;
  g.Ship.Shape.Point[ 2 ].y =  +8;
  g.Ship.ViewAngle = 0;
  g.Ship.Loc.x = 320;
  g.Ship.Loc.y = 240;
  g.Ship.Direction.x = 0;
  g.Ship.Direction.y = 0;
  }
void Cleanup( void )
  {
  closegraph();
  }
void main( int Argc, char *Argv[] )
  {
  puts( "\n\n" );
  puts( "Asteroids.  April 2012, \"What's the Code?\"\n" );
  puts( "Left shift:   Rotate left" );
  puts( "Right shift:  Rotate right" );
  puts( "Alt:          Thrust" );
  puts( "E:            Toggle 'erase' mode" );
  puts( "C:            Toggle color between white and green" );
  puts( "Q:            Quit\n" );
  puts( "Press any key to begin..." );
  getch();
  Init();
  Supervisor();
  Cleanup();
  }

I know this might be a little bit of work, but thanks for helping. Also notice this is not a workable game yet so give some advice. Thanks

Last edited by zeldaking on 26 Apr 2012 08:58:27 pm; edited 2 times in total
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Spenceboy98


Super-Expert


Joined: 06 Jan 2012
Posts: 827
Location: In the TARDIS
Posted: 25 Apr 2012 07:57:14 pm    Post subject:
I'm pretty sure I know what Asteroids is, but I'm not quite sure. It would be cool to clone for the Prizm. I would, but you already know that I am not very good with C.
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krazylegodrummer56


Power User


Joined: 20 Nov 2011
Posts: 404
Posted: 25 Apr 2012 08:03:18 pm    Post subject:
cool! can't wait.
_________________
Projects: Learn how to program in Prizm C
First C program!
Tic-Tac-Toe: Get it HERE!




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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 25 Apr 2012 08:04:27 pm    Post subject:
Notice the Help Me sign? Razz Thanks for the support guys.
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seana11


Super-Expert


Joined: 23 May 2011
Posts: 833
Location: Well, the sign says "You are here"...
Posted: 25 Apr 2012 08:17:01 pm    Post subject:
Spenceboy98 wrote:
I'm pretty sure I know what Asteroids is, but I'm not quite sure. It would be cool to clone for the Prizm. I would, but you already know that I am not very good with C.


http://www.youtube.com/watch?v=OSLZmtwJHJw

Today's youth...
_________________

Code:
-----BEGIN GEEK CODE BLOCK-----
GCS d- s+: a---@ C+++ UL++ P L+++ E- W++ N o? K? w--- O? M--
V- PS++(--) PE- Y+ PGP t 5? X(+) R tv-- b++(+++) DI+(++)
D(+) G e-(*)>++@ h! r!>+++ y?
------END GEEK CODE BLOCK------
decoded
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elfprince13


OVER NINE THOUSAND!


Joined: 23 May 2005
Posts: 10234
Location: A galaxy far far away......
Posted: 25 Apr 2012 11:37:28 pm    Post subject:
Spenceboy98 wrote:
I'm pretty sure I know what Asteroids is, but I'm not quite sure.


What is this, I don't even? Although.....I guess the correct meme would be "I'm -1-2- 14 and what is this?"


I'm suddenly very sad that the vast majority of our new users will no longer have any claim on having participated in 90s culture.
_________________
StickFigure Graphic Productions || VSHI: Vermont Sustainable Heating Initiative


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Ashbad


... I think redheaded girls are kind of cool


Joined: 01 Dec 2010
Posts: 2418
Location: Stomp Stomp Stomp, The Idiot Convention
Posted: 26 Apr 2012 06:04:57 am    Post subject:
I spy, with my little eye... a lot of floating point math you'll have to convert. I would ping KermM about his FP library, you'll need it if you want to port this as-is.

elfprince13 wrote:
Spenceboy98 wrote:
I'm suddenly very sad that the vast majority of our new users will no longer have any claim on having participated in 90s culture.


Wouldn't that be more of 80's culture? Either way, agreed, I find the question "What is Asteroids" incredibly saddening.
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-Ashbad
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flyingfisch


Super-Expert


Joined: 02 Feb 2012
Posts: 896
Location: Akron, OH
Posted: 26 Apr 2012 09:23:39 am    Post subject:
I know what asteroids is... love it!
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55773
Location: Earth, Sol, Milky Way
Posted: 26 Apr 2012 09:42:47 am    Post subject:
ANYWAY, getting back on topic. You'll need:

1) My trig routines
2) The built-in floating point support or my FP library. I recommend the former.
3) Line routines and such, which we certainly have.
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 26 Apr 2012 09:59:46 am    Post subject:
Where can I get the FP library?
I will start by changing the line routines into the prizm type. I should have time today.
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55773
Location: Earth, Sol, Milky Way
Posted: 26 Apr 2012 10:20:37 am    Post subject:
zeldaking wrote:
Where can I get the FP library?
I will start by changing the line routines into the prizm type. I should have time today.
I think it would be better to use our software floating point support than my FP library for this; I will send you my sin/cos/tan routines that use them.
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 26 Apr 2012 10:46:16 am    Post subject:
Oh okay, sorry I mistunderstood you.
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55773
Location: Earth, Sol, Milky Way
Posted: 26 Apr 2012 03:57:41 pm    Post subject:
Here's my sinfcosf.c file:
Code:

extern  float  __sinf(float);
extern  float  __tanf(float);

#include "gcas2.h"
#define EXTRA_PRECISION

float __sinf(float x)
{
   while (x > PI) x-=(2.f*PI);
   while (x < -PI) x+=(2.f*PI);
    const float B = 4/PI;
    const float C = -4/(PISQUARED);

    float y = B * x + C * x * fabsf(x);

    #ifdef EXTRA_PRECISION
    //  const float Q = 0.7775;
        const float P = 0.224008178776;

        y = P * (y * fabsf(y) - y) + y;   // Q * y + P * y * abs(y)
    #endif
   
   return y;
}

float __tanf(float x) {
   float y = __sinf(x);
   return y/((PIOVERTWO)-y);
}
You probably also need these, from my gcas2.h:


Code:
#define PIOVERTWO 1.570796327f
#define PI 3.141592654f
#define PISQUARED 9.869604401f

float __sinf(float);
float __tanf(float);
#define __cosf(x) __sinf((PIOVERTWO)+(x))

#define msinf __sinf
#define mcosf __cosf
#define mtanf __tanf


Then just use msinf, mcosf, and mtanf in your code!
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 26 Apr 2012 08:56:24 pm    Post subject:
I noticed this:

Code:

#include "gcas2.h"

Where is this file? Is it in the sdk already?
Or do I make it and add the code above (the bottom section)?
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PierrotLL


Advanced Newbie


Joined: 29 Nov 2011
Posts: 71
Location: France
Posted: 26 Apr 2012 09:12:54 pm    Post subject:
If you need it, I made a tiny fixed-point lib :

fixed.h
Code:
#ifndef FIXED_H
#define FIXED_H

// Bit lenght of the decimal part, change it to change the precision :
#define DB 15


typedef int fix;


// Fixed dot manipulations functions and macros :
#define FIX(x) ((x)<<DB)

#define UNFIX(x) ((x)>>DB)

char* fixtostr (fix n, char* string);

fix ftofix(float f);
float fixtof(fix f);

fix fdiv(fix x, fix y);
fix fmul(fix x, fix y);

fix fsqrt(fix f);

fix fsin(fix a);
fix fcos(fix a);
fix ftan(fix a);


#endif // FIXED_H


fixed.c
Code:
#include "fixed.h"

char* fixtostr (fix f, char* string) {
   int n;
   int  i;
   int  cpt;
   int start = 0;
   n = UNFIX(f);     
   
   if (n<0) {
      start=1;
      string[0] = '-';
      n *= -1;
   }
   for (i = 1, cpt = 1; n / i >= 10; i *= 10, cpt++);
   for (cpt = start; i; cpt++, i /= 10) string[cpt] = (n / i) % 10 + '0';
   string[cpt] = '\0';
   return string;
}

fix ftofix(float f) {
   return f*(1<<DB);
}

float fixtof(fix f) {
   return ((float)f)/(1<<DB);
}

fix fdiv(fix x, fix y) {
#ifdef _64bits
   return (fix) (((long long)x * y) >> DB);
#else
   if (y>(1<<(2*DB-2))) return x/(y>>DB);
   return fmul(x, ((1<<(2*DB))/y));
#endif
}

fix fmul(fix x, fix y) {
#ifdef _64bits
   return (fix) ((((long long)x) << DB) / y);
#else
   int d1, d2, e1, e2;
   e1 = x >> DB;
   e2 = y >> DB;
   d1 = x & (0xFFFFFFFF>>(32-DB));
   d2 = y & (0xFFFFFFFF>>(32-DB));
   return ((e1*e2)<<DB) + e1*d2 + e2*d1 + ((d1*d2)>>DB);
#endif
}

fix fsqrt(fix f)
{
   int i, s;
   s = (f + (1<<DB)) >> 1;
   /* 6 iterations to converge */
   for (i = 0; i < 6; i++)
      s = (s + fdiv(f, s)) >> 1;
   return s;
}

// Precomputed table of sinus value, between 0 and 90° inclued with step of 0.1°.
// Values are in fixed 30 bits of decimal.
int precalc_sin[901] = {
   0,         1874032,   3748058,   5622073,   7496071,   9370046,   11243993,
   13117905,   14991777,   16865604,   18739378,   20613096,   22486752,   24360338,
   26233852,   28107284,   29980632,   31853888,   33727044,   35600100,   37473048,
   39345884,   41218596,   43091184,   44963640,   46835960,   48708136,   50580168,
   52452040,   54323756,   56195304,   58066684,   59937884,   61808904,   63679732,
   65550372,   67420808,   69291040,   71161056,   73030864,   74900440,   76769800,
   78638912,   80507792,   82376432,   84244816,   86112936,   87980800,   89848400,
   91715720,   93582768,   95449528,   97315992,   99182160,   101048032,   102913592,
   104778840,   106643768,   108508376,   110372648,   112236584,   114100176,   115963424,
   117826320,   119688856,   121551024,   123412824,   125274248,   127135296,   128995952,
   130856208,   132716072,   134575536,   136434592,   138293216,   140151424,   142009216,
   143866576,   145723488,   147579952,   149435984,   151291552,   153146656,   155001296,
   156855456,   158709152,   160562352,   162415072,   164267296,   166119008,   167970224,
   169820928,   171671120,   173520784,   175369920,   177218512,   179066576,   180914096,
   182761056,   184607472,   186453312,   188298592,   190143296,   191987424,   193830960,
   195673904,   197516256,   199358016,   201199152,   203039680,   204879600,   206718880,
   208557552,   210395568,   212232960,   214069696,   215905776,   217741200,   219575968,
   221410064,   223243472,   225076224,   226908272,   228739632,   230570304,   232400272,
   234229520,   236058064,   237885888,   239712992,   241539360,   243364992,   245189872,
   247014032,   248837424,   250660048,   252481920,   254303024,   256123344,   257942896,
   259761664,   261579632,   263396800,   265213168,   267028736,   268843488,   270657408,
   272470528,   274282784,   276094240,   277904832,   279714592,   281523488,   283331520,
   285138720,   286945024,   288750464,   290555008,   292358688,   294161472,   295963360,
   297764352,   299564416,   301363584,   303161824,   304959168,   306755552,   308551008,
   310345536,   312139104,   313931712,   315723392,   317514112,   319303840,   321092608,
   322880384,   324667200,   326453024,   328237824,   330021664,   331804480,   333586272,
   335367072,   337146848,   338925568,   340703296,   342479936,   344255584,   346030144,
   347803680,   349576160,   351347552,   353117888,   354887136,   356655296,   358422400,
   360188384,   361953280,   363717088,   365479744,   367241344,   369001792,   370761120,
   372519328,   374276384,   376032320,   377787104,   379540736,   381293184,   383044512,
   384794656,   386543616,   388291424,   390038048,   391783456,   393527680,   395270720,
   397012544,   398753184,   400492576,   402230752,   403967712,   405703456,   407437952,
   409171200,   410903200,   412633952,   414363456,   416091680,   417818656,   419544352,
   421268768,   422991904,   424713760,   426434304,   428153568,   429871488,   431588128,
   433303456,   435017472,   436730144,   438441504,   440151520,   441860192,   443567488,
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fix fsin(fix a) {
   int v;
   if(a<0) v = 3600+UNFIX(a*10)%3600;
   else v = UNFIX(a*10)%3600;
   if (v<=900) return precalc_sin[v]>>(30-DB);
   if (v<=1800) return precalc_sin[1800-v]>>(30-DB);
   if (v<=2700) return -(precalc_sin[v-1800]>>(30-DB));
   return -(precalc_sin[3600-v]>>(30-DB));
}


fix fcos(fix a) {
   return fsin(FIX(90)-a);
}


fix ftan(fix a) {
   return fdiv(fsin(a), fcos(a));
}

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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55773
Location: Earth, Sol, Milky Way
Posted: 26 Apr 2012 10:57:05 pm    Post subject:
zeldaking wrote:
I noticed this:

Code:

#include "gcas2.h"

Where is this file? Is it in the sdk already?
Or do I make it and add the code above (the bottom section)?
The latter thing. Might as well call it sinfcosf.h.

Pierrot: My fixed-point library looks very very similar to that. We should compare notes one day. Wink
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Eiyeron


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Joined: 12 Dec 2011
Posts: 158
Posted: 27 Apr 2012 03:50:54 am    Post subject:
PierrotLL wrote:
If you need it, I made a tiny fixed-point lib :

--snip--


I already saw that source in the Kristaba's 3d engine. It was yours?
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KermMartian


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Joined: 14 Mar 2005
Posts: 55773
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Posted: 27 Apr 2012 08:32:58 am    Post subject:
Eiyeron wrote:
PierrotLL wrote:
If you need it, I made a tiny fixed-point lib :

--snip--


I already saw that source in the Kristaba's 3d engine. It was yours?
What's Kirstaba's 3D Engine, and why isn't it here? Smile We're getting off-topic, though; let's stick with helping Zeldaking get his Asteroids game ported over. We should share our fixed-point and trig libraries in the Useful Prizm Routines topic.
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PierrotLL


Advanced Newbie


Joined: 29 Nov 2011
Posts: 71
Location: France
Posted: 27 Apr 2012 10:21:56 am    Post subject:
Eiyeron wrote:
I already saw that source in the Kristaba's 3d engine. It was yours?

It's my improvement of the Kristaba's snippet Smile

@Kerm, I think all fixed-point libraries look alike ^^
Do you have more functions in yours, like asin/acos/atan or sinh/cosh/tanh ? :p
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KermMartian


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Joined: 14 Mar 2005
Posts: 55773
Location: Earth, Sol, Milky Way
Posted: 27 Apr 2012 10:24:17 am    Post subject:
Sadly, I have neither the inverse nor hyperbolic trigonometric functions in mine. Sad I didn't really bother updating my library anymore once the PrizmSDK got working software floats.
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