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dos33fsprogs/gr-sim/tfv_flying_6502.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "gr-sim.h"
#include "tfv_utils.h"
#include "tfv_zp.h"
#include "tfv_sprites.h"
/* Zero page allocations */
#define TURNING 0x60
#define SCREEN_X 0x61 // current screen position
#define SCREEN_Y 0x62
#define ANGLE 0x63 // ship angle
#define HORIZ_SCALE_I 0x64 // horizontal scale
#define HORIZ_SCALE_F 0x65
#define FACTOR_I 0x66
#define FACTOR_F 0x67
#define DX_I 0x68
#define DX_F 0x69
#define SPACEX_I 0x6a // current space position
#define SPACEX_F 0x6b
#define CX_I 0x6c // map coordinates
#define CX_F 0x6d
#define DY_I 0x6e
#define DY_F 0x6f
#define SPACEY_I 0x70
#define SPACEY_F 0x71
#define CY_I 0x72
#define CY_F 0x73
#define TEMP_I 0x74
#define TEMP_F 0x75
#define DISTANCE_I 0x76 // the distance and horizontal scale of the line we are drawing
#define DISTANCE_F 0x77
#define SPACEZ_I 0x78 // height of the camera above the plane
#define SPACEZ_F 0x79
#define DRAW_SPLASH 0x7a
#define SPEED 0x7b
#define SPLASH_COUNT 0x7c
#define OVER_LAND 0x7d
#define NUM1L 0x7E
#define NUM1H 0x7F
#define NUM2L 0x80
#define NUM2H 0x81
#define RESULT 0x82 // 83,84,85
#define NEGATE 0x86 // UNUSED?
#define LAST_SPACEX_I 0x87
#define LAST_SPACEY_I 0x88
#define LAST_MAP_COLOR 0x89
#define DRAW_SKY 0x8A
#define SHIPY 0xE4
/* constants */
#define CONST_SCALE_I 0x14 // 20.0
#define CONST_SCALE_F 0x00
#define CONST_BETA_I 0xff // -0.5 ??
#define CONST_BETA_F 0x80
#define CONST_SHIPX 15
#define CONST_LOWRES_HALF_I 0xec // -20 (LOWRES_W/2)
#define CONST_LOWRES_HALF_F 0x0
/* Mode7 code based on code from: */
/* http://www.helixsoft.nl/articles/circle/sincos.htm */
static unsigned char flying_map[64]= {
2,15,15,15, 15,15,15, 2,
13,12,12, 8, 4, 4, 0,13,
13,12,12,12, 8, 4, 4,13,
13,12,12, 8, 4, 4, 4,13,
13,12, 9, 9, 8, 4, 4,13,
13,12, 9, 8, 4, 4, 4,13,
13,12, 9, 9, 1, 4, 4,13,
2,13,13,13, 13,13,13, 2};
static unsigned char water_map[32]={
2,2,2,2, 2,2,2,2,
14,2,2,2, 2,2,2,2,
2, 2,2,2, 2,2,2,2,
2,2,2,2, 14,2,2,2,
};
#define TILE_W 64
#define TILE_H 64
#define MASK_X (TILE_W - 1)
#define MASK_Y (TILE_H - 1)
#define LOWRES_W 40
#define LOWRES_H 40
static int displayed=1;
struct cycle_counts {
int flying;
int getkey;
int page_flip;
int mode7;
int multiply;
int lookup_map;
int put_sprite;
} cycles;
static int lookup_map(int xx, int yy) {
int color,offset;
ram[LAST_SPACEX_I]=xx;
xx=xx&MASK_X;
ram[LAST_SPACEY_I]=yy;
yy=yy&MASK_Y;
if (!displayed) {
printf("XX,YY! %x,%x\n",xx,yy);
}
// if ( ((y&0x3)==1) && ((x&7)==0) ) color=14;
// if ( ((y&0x3)==3) && ((x&7)==4) ) color=14;
offset=yy<<3;
offset+=xx;
cycles.lookup_map+=39;
if (yy>7) {
cycles.lookup_map+=3;
goto ocean_color;
}
cycles.lookup_map+=7;
if (xx>7) {
cycles.lookup_map+=3;
goto ocean_color;
}
color=flying_map[offset];
cycles.lookup_map+=11;
goto update_cache;
ocean_color:
color=water_map[offset&0x1f];
cycles.lookup_map+=8;
goto update_cache;
/* 2 2 2 2 2 2 2 2 */
/* e 2 2 2 2 2 2 2 */
/* 2 2 2 2 2 2 2 2 */
/* 2 2 2 2 e 2 2 2 */
update_cache:
if (!displayed) {
printf("COLOR! %x\n",color);
}
cycles.lookup_map+=10;
ram[LAST_MAP_COLOR]=color;
return color;
}
// Speed
#define SPEED_STOPPED 0
#define ANGLE_STEPS 16
// FIXME: take advantage of symmetry?
static struct fixed_type fixed_sin[ANGLE_STEPS]={
{0x00,0x00}, // 0.000000=00.00
{0x00,0x61}, // 0.382683=00.61
{0x00,0xb5}, // 0.707107=00.b5
{0x00,0xec}, // 0.923880=00.ec
{0x01,0x00}, // 1.000000=01.00
{0x00,0xec}, // 0.923880=00.ec
{0x00,0xb5}, // 0.707107=00.b5
{0x00,0x61}, // 0.382683=00.61
{0x00,0x00}, // 0.000000=00.00
{0xff,0x9f}, // -0.382683=ff.9f
{0xff,0x4b}, // -0.707107=ff.4b
{0xff,0x14}, // -0.923880=ff.14
{0xff,0x00}, // -1.000000=ff.00
{0xff,0x14}, // -0.923880=ff.14
{0xff,0x4b}, // -0.707107=ff.4b
{0xff,0x9f}, // -0.382683=ff.9f
};
// div by 8
static struct fixed_type fixed_sin_scale[ANGLE_STEPS]={
{0x00,0x00},
{0x00,0x0c},
{0x00,0x16},
{0x00,0x1d},
{0x00,0x20},
{0x00,0x1d},
{0x00,0x16},
{0x00,0x0c},
{0x00,0x00},
{0xff,0xf4},
{0xff,0xea},
{0xff,0xe3},
{0xff,0xe0},
{0xff,0xe3},
{0xff,0xea},
{0xff,0xf4},
};
//static unsigned char horizontal_lookup[7][16] = {
// {0x0C,0x0A,0x09,0x08,0x07,0x06,0x05,0x05,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,},
// {0x26,0x20,0x1B,0x18,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0C,0x0C,0x0B,0x0A,0x0A,0x09,},
// {0x40,0x35,0x2D,0x28,0x23,0x20,0x1D,0x1A,0x18,0x16,0x15,0x14,0x12,0x11,0x10,0x10,},
// {0x59,0x4A,0x40,0x38,0x31,0x2C,0x28,0x25,0x22,0x20,0x1D,0x1C,0x1A,0x18,0x17,0x16,},
// {0x73,0x60,0x52,0x48,0x40,0x39,0x34,0x30,0x2C,0x29,0x26,0x24,0x21,0x20,0x1E,0x1C,},
// {0x8C,0x75,0x64,0x58,0x4E,0x46,0x40,0x3A,0x36,0x32,0x2E,0x2C,0x29,0x27,0x25,0x23,},
// {0xA6,0x8A,0x76,0x68,0x5C,0x53,0x4B,0x45,0x40,0x3B,0x37,0x34,0x30,0x2E,0x2B,0x29,},
//};
//static unsigned char horizontal_lookup[7][32] = {
static unsigned char horizontal_lookup[7*32] = {
0x0C,0x0B,0x0A,0x09,0x09,0x08,0x08,0x07,
0x07,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x03,
0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,
0x26,0x22,0x20,0x1D,0x1B,0x19,0x18,0x16,
0x15,0x14,0x13,0x12,0x11,0x10,0x10,0x0F,
0x0E,0x0E,0x0D,0x0D,0x0C,0x0C,0x0C,0x0B,
0x0B,0x0A,0x0A,0x0A,0x0A,0x09,0x09,0x09,
0x40,0x3A,0x35,0x31,0x2D,0x2A,0x28,0x25,
0x23,0x21,0x20,0x1E,0x1D,0x1B,0x1A,0x19,
0x18,0x17,0x16,0x16,0x15,0x14,0x14,0x13,
0x12,0x12,0x11,0x11,0x10,0x10,0x10,0x0F,
0x59,0x51,0x4A,0x44,0x40,0x3B,0x38,0x34,
0x31,0x2F,0x2C,0x2A,0x28,0x26,0x25,0x23,
0x22,0x21,0x20,0x1E,0x1D,0x1C,0x1C,0x1B,
0x1A,0x19,0x18,0x18,0x17,0x16,0x16,0x15,
0x73,0x68,0x60,0x58,0x52,0x4C,0x48,0x43,
0x40,0x3C,0x39,0x36,0x34,0x32,0x30,0x2E,
0x2C,0x2A,0x29,0x27,0x26,0x25,0x24,0x22,
0x21,0x20,0x20,0x1F,0x1E,0x1D,0x1C,0x1C,
0x8C,0x80,0x75,0x6C,0x64,0x5D,0x58,0x52,
0x4E,0x4A,0x46,0x43,0x40,0x3D,0x3A,0x38,
0x36,0x34,0x32,0x30,0x2E,0x2D,0x2C,0x2A,
0x29,0x28,0x27,0x26,0x25,0x24,0x23,0x22,
0xA6,0x97,0x8A,0x80,0x76,0x6E,0x68,0x61,
0x5C,0x57,0x53,0x4F,0x4B,0x48,0x45,0x42,
0x40,0x3D,0x3B,0x39,0x37,0x35,0x34,0x32,
0x30,0x2F,0x2E,0x2C,0x2B,0x2A,0x29,0x28,
};
static void fixed_add(unsigned char x_i,unsigned char x_f,
unsigned char y_i, unsigned char y_f,
unsigned char *z_i, unsigned char *z_f) {
int carry;
short sum;
sum=(short)(x_f)+(short)(y_f);
if (sum>=256) carry=1;
else carry=0;
*z_f=sum&0xff;
*z_i=x_i+y_i+carry;
}
// Description: Unsigned 16-bit multiplication with unsigned 32-bit result.
// Input: 16-bit unsigned value in T1
// 16-bit unsigned value in T2
// Carry=0: Re-use T1 from previous multiplication (faster)
// Carry=1: Set T1 (slower)
//
// Output: 32-bit unsigned value in PRODUCT
// Clobbered: PRODUCT, X, A, C
// Allocation setup: T1,T2 and PRODUCT preferably on Zero-page.
// square1_lo, square1_hi, square2_lo, square2_hi must be
// page aligned. Each table are 512 bytes. Total 2kb.
//
// Table generation: I:0..511
// square1_lo = <((I*I)/4)
// square1_hi = >((I*I)/4)
// square2_lo = <(((I-255)*(I-255))/4)
// square2_hi = >(((I-255)*(I-255))/4)
static unsigned char square1_lo[512];
static unsigned char square1_hi[512];
static unsigned char square2_lo[512];
static unsigned char square2_hi[512];
static int sm1a,sm3a,sm5a,sm7a;
static int sm2a,sm4a,sm6a,sm8a;
static int sm1b,sm3b,sm5b; //,sm7b;
static int sm2b,sm4b,sm6b; //,sm8b;
static int table_ready=0;
static void init_table(void) {
int i;
for(i=0;i<512;i++) {
square1_lo[i]=((i*i)/4)&0xff;
square1_hi[i]=(((i*i)/4)>>8)&0xff;
square2_lo[i]=( ((i-255)*(i-255))/4)&0xff;
square2_hi[i]=(( ((i-255)*(i-255))/4)>>8)&0xff;
// printf("%d %x:%x %x:%x\n",i,square1_hi[i],square1_lo[i],
// square2_hi[i],square2_lo[i]);
}
table_ready=1;
// 3 * 2
// 3+2 = 5
// 3-2 = 1
// (25 - 1) = 24/4 = 6
// int num1l,num2l,a1,a2;
// num1l=7;
// num2l=9;
// printf("Trying %d*%d\n",num1l,num2l);
// a1=square1_lo[num1l+num2l];
// printf("((%d+%d)^2)/4: %d\n",num1l,num2l,a1);
// a2=square2_lo[((~num1l)&0xff)+num2l];
// printf("((%d-%d)^2)/4: %d\n",num1l,num2l,a2);
// printf("%d*%d=%d\n",num1l,num2l,a1-a2);
}
static unsigned int product[4];
static void fixed_mul(unsigned char x_i, unsigned char x_f,
unsigned char y_i, unsigned char y_f,
unsigned char *z_i, unsigned char *z_f,
int reuse) {
int debug=0;
//static int fixed_mul_unsigned(
// unsigned char x_i, unsigned char x_f,
// unsigned char y_i, unsigned char y_f,
// unsigned char *z_i, unsigned char *z_f,
// int debug, int reuse) {
// <T1 * <T2 = AAaa
// <T1 * >T2 = BBbb
// >T1 * <T2 = CCcc
// >T1 * >T2 = DDdd
//
// AAaa
// BBbb
// CCcc
// + DDdd
// ----------
// PRODUCT!
// ; Setup T1 if changed
int c=0;
int a,x;
int _AA,_BB,_CC; //,_DD;
int _aa,_bb,_cc,_dd;
if (!table_ready) init_table();
// printf("\t\t\tMultiplying %2x:%2x * %2x:%2x\n",x_i,x_f,y_i,y_f);
/* Set up self-modifying code */
if (reuse==0) {
a=(x_f)&0xff; // lda T1+0 ; 3
sm1a=a; // sta sm1a+1 ; 3
sm3a=a; // sta sm3a+1 ; 3
sm5a=a; // sta sm5a+1 ; 3
sm7a=a; // sta sm7a+1 ; 3
a=(~a)&0xff; // eor #$ff ; 2
sm2a=a; // sta sm2a+1 ; 3
sm4a=a; // sta sm4a+1 ; 3
sm6a=a; // sta sm6a+1 ; 3
sm8a=a; // sta sm8a+1 ; 3
a=(x_i)&0xff; // lda T1+1 ; 3
sm1b=a; // sta sm1b+1 ; 3
sm3b=a; // sta sm3b+1 ; 3
sm5b=a; // sta sm5b+1 ; 3
// sm7b=a; // sta sm7b+1 ;
a=(~a)&0xff; // eor #$ff ; 2
sm2b=a; // sta sm2b+1 ; 3
sm4b=a; // sta sm4b+1 ; 3
sm6b=a; // sta sm6b+1 ; 3
// sm8b=a; // sta sm8b+1 ;
cycles.multiply+=52;
}
/* Perform <T1 * <T2 = AAaa */
x=(y_f)&0xff; // ldx T2+0 (low le) ; 3
c=1; // sec ; 2
//sm1a:
a=square1_lo[sm1a+x]; // lda square1_lo,x ; 4
//sm2a:
a+=~(square2_lo[sm2a+x])+c; // sbc square2_lo,x ; 4
c=!(a&0x100);
a&=0xff;
// product[0]=a; // sta PRODUCT+0 ;
// _aa=a;
//sm3a:
a=square1_hi[sm3a+x]; // lda square1_hi,x ; 4
//sm4a:
a+=(~(square2_hi[sm4a+x]))+c; // sbc square2_hi,x ; 4
c=!(a&0x100);
a&=0xff;
_AA=a; // sta _AA+1 ; 3
// ;===========
// ; 24
cycles.multiply+=24;
/* Perform >T1_hi * <T2 = CCcc */
c=1; // sec ; 2
//sm1b:
a=square1_lo[sm1b+x]; // lda square1_lo,x ; 4
//sm2b:
a+=(~(square2_lo[sm2b+x]))+c; // sbc square2_lo,x ; 4
c=!(a&0x100);
a&=0xff;
_cc=a; // sta _cc+1 ; 3
//sm3b:
a=square1_hi[sm3b+x]; // lda square1_hi,x ; 4
//sm4b:
a+=(~(square2_hi[sm4b+x]))+c; // sbc square2_hi,x ; 4
c=!!(a&0x100);
a&=0xff;
_CC=a; // sta _CC+1 ; 3
cycles.multiply+=24;
/* Perform <T1 * >T2 = BBbb */
x=(y_i)&0xff; // ldx T2+1 ; 3
c=1; // sec ; 2
//sm5a:
a=square1_lo[sm5a+x]; // lda square1_lo,x ; 4
//sm6a:
a+=(~(square2_lo[sm6a+x]))+c; // sbc square2_lo,x ; 4
c=!(a&0x100);
a&=0xff;
_bb=a; // sta _bb+1 ; 3
//sm7a:
a=square1_hi[sm7a+x]; // lda square1_hi,x ; 4
//sm8a:
a+=(~(square2_hi[sm8a+x]))+c; // sbc square2_hi,x ; 4
c=!(a&0x100);
a&=0xff;
_BB=a; // sta _BB+1 ; 3
cycles.multiply+=27;
/* Perform >T1 * >T2 = DDdd */
c=1; // sec ; 2
//sm5b:
a=square1_lo[sm5b+x]; // lda square1_lo,x ; 4
//sm6b:
a+=(~(square2_lo[sm6b+x]))+c; // sbc square2_lo,x ; 4
c=!(a&0x100);
a&=0xff;
_dd=a; // sta _dd+1 ; 3
//sm7b:
//a=square1_hi[sm7b+x]; // lda square1_hi,x ;
//sm8b:
//a+=(~(square2_hi[sm8b+x]))+c; // sbc square2_hi,x ;
//c=!(a&0x100);
//a&=0xff;
//product[3]=a; // sta PRODUCT+3 ;
//_DD=a;
cycles.multiply+=13;
/*********************************************/
/* Add the separate multiplications together */
/*********************************************/
// product[0]=_aa;
if (debug) printf("product[0]=0.%02x\n",_aa);
// product[1]=_AA+_bb+(_cc)
if (debug) printf("product[1]=%02x+%02x+0=",_AA,_bb);
c=0; // clc ; 2
//_AA:
a=_AA; // lda #0 ; 2
//_bb:
a+=(c+_bb); // adc #0 ; 2
c=!!(a&0x100);
a&=0xff;
product[1]=a; // sta PRODUCT+1 ; 3
if (debug) printf("%x.%02x\n",c,a);
cycles.multiply+=9;
// product[2]=_BB+_CC+c
if (debug) printf("product[2]=%02x+%02x+%d=",_BB,_CC,c);
//_BB:
a=_BB; // lda #0 ; 2
//_CC:
a+=(c+_CC); // adc #0 ; 2
c=!!(a&0x100);
a&=0xff;
product[2]=a; // sta PRODUCT+2 ; 3
if (debug) printf("%x.%02x\n",c,a);
cycles.multiply+=7;
// product[3]=_DD+c
// if (debug) printf("product[3]=%02x+%d=",_DD,c);
// if (c==0) goto urgh2; // bcc :+ ; 2nt/3
// product[3]++; // inc PRODUCT+3 ; 5
// product[3]&=0xff;
c=0; // clc ; 2
cycles.multiply+=2;
//urgh2:
if (debug) printf("%x.%02x\n",c,product[3]);
// product[1]=_AA+_bb+_cc
if (debug) printf("product[1]=%02x+%02x+%d=",product[1],_cc,c);
//_cc:
a=_cc; // lda #0 ; 2
a+=c+product[1]; // adc PRODUCT+1 ; 3
c=!!(a&0x100);
a&=0xff;
product[1]=a; // sta PRODUCT+1 ; 3
if (debug) printf("%x.%02x\n",c,product[1]);
// product[2]=_BB+_CC+_dd+c
if (debug) printf("product[2]=%02x+%02x+%d=",product[2],_dd,c);
//_dd:
a=_dd; // lda #0 ; 2
a+=c+product[2]; // adc PRODUCT+2 ; 3
c=!!(a&0x100);
a&=0xff;
product[2]=a; // sta PRODUCT+2 ; 3
if (debug) printf("%x.%02x\n",c,product[2]);
// product[3]=_DD+c
//if (debug) printf("product[3]=%02x+%d=",product[3],c);
cycles.multiply+=16;
//if (c==0) goto urgh; // bcc :+ ; 2nt/3
//product[3]++; // inc PRODUCT+3 ; 5
//product[3]&=0xff;
cycles.multiply+=0;
//urgh:
if (debug) printf("%x.%02x\n",c,product[3]);
*z_i=product[1];
*z_f=product[0];
// printf("Result=%02x:%02x\n",*z_i,*z_f);
// if (debug) {
// printf(" AAaa %02x:%02x\n",_AA,_aa);
// printf(" BBbb %02x:%02x\n",_BB,_bb);
// printf(" CCcc %02x:%02x\n",_CC,_cc);
// printf("DDdd %02x:%02x\n",_DD,_dd);
// }
// cycles.multiply+=6;
// return (product[3]<<24)|(product[2]<<16)|(product[1]<<8)|product[0];
// rts ; 6
//}
/* signed */
//static void fixed_mul(unsigned char x_i, unsigned char x_f,
// unsigned char y_i, unsigned char y_f,
// unsigned char *z_i, unsigned char *z_f, int reuse) {
// fixed_mul_unsigned(x_i,x_f,y_i,y_f,z_i,z_f,0,reuse);
// jsr multiply_16bit_unsigned ;
a=(x_i&0xff); // lda T1+1 ; 3
cycles.multiply+=6;
if ((a&0x80)==0) goto x_positive; // bpl :+ ;^3/2nt
c=1; // sec ; 2
a=product[2]; // lda PRODUCT+2 ; 3
a+=(~y_f)+c; // sbc T2+0 ; 3
c=!(a&0x100);
a&=0xff;
product[2]=a; // sta PRODUCT+2 ; 3
// a=product[3]; // lda PRODUCT+3 ;
// a+=(~y_i)+c; // sbc T2+1 ;
// c=!(a&0x100);
// a&=0xff;
// product[3]=a; // sta PRODUCT+3 ;
cycles.multiply+=10;
x_positive:
a=(y_i&0xff); // lda T2+1 ; 3
cycles.multiply+=6;
if ((a&0x80)==0) goto y_positive; // bpl :+ ;^3/2nt
c=1; // sec ; 2
a=product[2]; // lda PRODUCT+2 ; 3
a+=(~x_f)+c; // sbc T1+0 ; 3
c=!(a&0x100);
a&=0xff;
product[2]=a; // sta PRODUCT+2 ; 3
// a=product[3]; // lda PRODUCT+3 ;
// a+=(~x_i)+c; // sbc T1+1 ;
// c=!(a&0x100);
// a&=0xff;
// product[3]=a; // sta PRODUCT+3 ;
cycles.multiply+=10;
y_positive:
*z_i=product[2];
*z_f=product[1];
// return (product[3]<<24)|(product[2]<<16)|(product[1]<<8)|product[0];
// rts ; 6
cycles.multiply+=12;
}
static void update_z_factor(void) {
/* only do this if SPACEZ changes? */
// mul1
fixed_mul(ram[SPACEZ_I],ram[SPACEZ_F],
CONST_BETA_I,CONST_BETA_F,
&ram[FACTOR_I],&ram[FACTOR_F],0);
cycles.flying+=60;
if (!displayed) {
printf("SPACEZ/BETA/FACTOR %x %x * %x %x = %x %x\n",
ram[SPACEZ_I],ram[SPACEZ_F],
CONST_BETA_I, CONST_BETA_F,
ram[FACTOR_I],ram[FACTOR_F]);
}
}
static void draw_background_mode7(void) {
int map_color;
cycles.mode7+=6;
if (ram[DRAW_SKY]) {
ram[DRAW_SKY]--;
/* Draw Sky */
/* Originally wanted to be fancy and have sun too, but no */
color_equals(COLOR_MEDIUMBLUE);
cycles.mode7+=11;
//sky_loop:
for(ram[SCREEN_Y]=0;ram[SCREEN_Y]<6;ram[SCREEN_Y]+=2) {
hlin_double(ram[DRAW_PAGE], 0, 40, ram[SCREEN_Y]);
}
cycles.mode7+=(63+(16*40)+23)*5;
/* Draw hazy horizon */
color_equals(COLOR_GREY);
hlin_double(ram[DRAW_PAGE], 0, 40, 6);
cycles.mode7+=14+63+(16*40);
}
//no_draw_sky:
ram[SCREEN_Y]=8;
cycles.mode7+=10;
do {
//screeny_loop:
y=0;
/* actual code does even/odd stuff here */
cycles.mode7+=27;
//setup_gr_addr:
hlin_setup(ram[DRAW_PAGE],y,0,ram[SCREEN_Y]);
cycles.mode7+=21;
//calc_horizontal_scale:
// then calculate the horizontal scale, or the distance between
// space points on this horizontal line
ram[HORIZ_SCALE_I]=0;
ram[HORIZ_SCALE_F]=
//horizontal_lookup[ram[SPACEZ_I]&0xf]
// [(ram[SCREEN_Y]-8)];
horizontal_lookup[((ram[SPACEZ_I]&0xf)<<5)+
(ram[SCREEN_Y]-8)];
cycles.mode7+=16;
if (!displayed) {
printf("HORIZ_SCALE %x %x\n",
ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F]);
}
//mul2 // calculate the distance of the line we are drawing
fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
CONST_SCALE_I,CONST_SCALE_F,
&ram[DISTANCE_I],&ram[DISTANCE_F],0);
cycles.mode7+=27;
if (!displayed) {
printf("DISTANCE %x:%x\n",ram[DISTANCE_I],ram[DISTANCE_F]);
}
// calculate the dx and dy of points in space when we step
// through all points on this line
ram[DX_I]=fixed_sin[(ram[ANGLE]+8)&0xf].i; // -sin()
ram[DX_F]=fixed_sin[(ram[ANGLE]+8)&0xf].f; // -sin()
cycles.mode7+=29;
// mul3
fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
ram[DX_I],ram[DX_F],
&ram[DX_I],&ram[DX_F],1);
cycles.mode7+=14;
if (!displayed) {
printf("DX %x:%x\n",ram[DX_I],ram[DX_F]);
}
ram[DY_I]=fixed_sin[(ram[ANGLE]+4)&0xf].i; // cos()
ram[DY_F]=fixed_sin[(ram[ANGLE]+4)&0xf].f; // cos()
cycles.mode7+=29;
// mul4
fixed_mul(ram[HORIZ_SCALE_I],ram[HORIZ_SCALE_F],
ram[DY_I],ram[DY_F],
&ram[DY_I],&ram[DY_F],1);
cycles.mode7+=14;
if (!displayed) {
printf("DY %x:%x\n",ram[DY_I],ram[DY_F]);
}
// calculate the starting position
fixed_add(ram[DISTANCE_I],ram[DISTANCE_F],
ram[FACTOR_I],ram[FACTOR_F],
&ram[SPACEX_I],&ram[SPACEX_F]);
fixed_add(ram[DISTANCE_I],ram[DISTANCE_F],
ram[FACTOR_I],ram[FACTOR_F],
&ram[SPACEY_I],&ram[SPACEY_F]);
cycles.mode7+=26;
ram[TEMP_I]=fixed_sin[(ram[ANGLE]+4)&0xf].i; // cos
ram[TEMP_F]=fixed_sin[(ram[ANGLE]+4)&0xf].f; // cos
cycles.mode7+=29;
// mul5
fixed_mul(ram[SPACEX_I],ram[SPACEX_F],
ram[TEMP_I],ram[TEMP_F],
&ram[SPACEX_I],&ram[SPACEX_F],0);
cycles.mode7+=20;
fixed_add(ram[SPACEX_I],ram[SPACEX_F],
ram[CX_I],ram[CX_F],
&ram[SPACEX_I],&ram[SPACEX_F]);
cycles.mode7+=16;
ram[TEMP_I]=fixed_sin[ram[ANGLE]&0xf].i;
ram[TEMP_F]=fixed_sin[ram[ANGLE]&0xf].f;
cycles.mode7+=25;
// mul6
fixed_mul(ram[SPACEY_I],ram[SPACEY_F],
ram[TEMP_I],ram[TEMP_F],
&ram[SPACEY_I],&ram[SPACEY_F],0);
cycles.mode7+=20;
fixed_add(ram[SPACEY_I],ram[SPACEY_F],
ram[CY_I],ram[CY_F],
&ram[SPACEY_I],&ram[SPACEY_F]);
cycles.mode7+=16;
// mul7
fixed_mul(CONST_LOWRES_HALF_I,CONST_LOWRES_HALF_F,
ram[DX_I],ram[DX_F],
&ram[TEMP_I],&ram[TEMP_F],0);
cycles.mode7+=38;
fixed_add(ram[SPACEX_I],ram[SPACEX_F],
ram[TEMP_I],ram[TEMP_F],
&ram[SPACEX_I],&ram[SPACEX_F]);
cycles.mode7+=16;
if (!displayed) {
printf("SPACEX! %x:%x\n",
ram[SPACEX_I],ram[SPACEX_F]);
}
// mul8
fixed_mul(CONST_LOWRES_HALF_I,CONST_LOWRES_HALF_F,
ram[DY_I],ram[DY_F],
&ram[TEMP_I],&ram[TEMP_F],1);
cycles.mode7+=28;
fixed_add(ram[SPACEY_I],ram[SPACEY_F],
ram[TEMP_I],ram[TEMP_F],
&ram[SPACEY_I],&ram[SPACEY_F]);
cycles.mode7+=16;
if (!displayed) {
printf("SPACEY! %x:%x\n",ram[SPACEY_I],ram[SPACEY_F]);
}
// go through all points in this screen line
ram[SCREEN_X] = LOWRES_W;
cycles.mode7+=2;
while(1) {
// get a pixel from the tile and put it on the screen
nomatch:
map_color=lookup_map(ram[SPACEX_I],ram[SPACEY_I]);
cycles.lookup_map-=6;
match:
ram[COLOR]=(map_color&0xf);
// ram[COLOR]|=map_color<<4;
y=0;
if ((ram[SCREEN_Y]&1)==0) {
ram[y_indirect(GBASL,y)]=ram[COLOR];
cycles.mode7+=18;
}
else {
a=ram[COLOR];
ram[y_indirect(GBASL,y)]|=(a<<4);
cycles.mode7+=22;
}
ram[GBASL]++;
// advance to the next position in space
fixed_add(ram[SPACEX_I],ram[SPACEX_F],
ram[DX_I],ram[DX_F],
&ram[SPACEX_I],&ram[SPACEX_F]);
cycles.mode7+=18;
fixed_add(ram[SPACEY_I],ram[SPACEY_F],
ram[DY_I],ram[DY_F],
&ram[SPACEY_I],&ram[SPACEY_F]);
cycles.mode7+=18;
ram[SCREEN_X]--;
if (ram[SCREEN_X]== 0) {
cycles.mode7+=5;
break;
}
cycles.mode7+=4;
/* cache last value */
cycles.mode7+=5;
if (ram[SPACEY_I]!=ram[LAST_SPACEY_I]) {
cycles.mode7+=3;
goto nomatch;
}
cycles.mode7+=7;
if (ram[SPACEX_I]!=ram[LAST_SPACEX_I]) {
cycles.mode7+=3;
goto nomatch;
}
cycles.mode7+=7;
map_color=ram[LAST_MAP_COLOR];
goto match;
}
ram[SCREEN_Y]+=1;
cycles.mode7+=15;
} while(ram[SCREEN_Y] < LOWRES_H);
displayed=1;
cycles.mode7+=6;
}
static int iterations=0;
int flying(void) {
unsigned char ch;
/************************************************/
/* Flying */
/************************************************/
/* Benchmark the multiply */
memset(&cycles,0,sizeof(cycles));
fixed_mul(0x1,0x0,
0x2,0x0,
&ram[TEMP_I],&ram[TEMP_F],0);
printf("Multiplying 1.0 * 2.0 = %d.%d, took %d cycles\n",
ram[TEMP_I],ram[TEMP_F],cycles.multiply);
memset(&cycles,0,sizeof(cycles));
fixed_mul(0xff,0xff,
0xff,0xff,
&ram[TEMP_I],&ram[TEMP_F],0);
printf("Multiplying ff.ff * ff.ff = %d.%d, took %d cycles\n",
ram[TEMP_I],ram[TEMP_F],cycles.multiply);
gr();
ram[DRAW_PAGE]=PAGE0;
clear_bottom();
ram[DRAW_PAGE]=PAGE1;
clear_bottom();
ram[SHIPY]=20;
ram[TURNING]=0;
ram[SPACEX_I]=0;
ram[SPACEY_I]=0;
ram[CX_I]=0;
ram[CX_F]=0;
ram[CY_I]=0;
ram[CY_F]=0;
ram[DRAW_SPLASH]=0;
ram[SPEED]=0;
ram[SPLASH_COUNT]=0;
ram[ANGLE]=1; /* 1 so you can see island */
ram[DRAW_SKY]=2;
ram[SPACEZ_I]=4;
ram[SPACEZ_F]=0x80; /* Z=4.5 */
update_z_factor();
while(1) {
memset(&cycles,0,sizeof(cycles));
cycles.flying+=6;
if (ram[SPLASH_COUNT]>0) {
cycles.flying--;
ram[SPLASH_COUNT]--;
cycles.flying+=5;
}
ch=grsim_input();
cycles.getkey=46;
cycles.flying+=3;
if ((ch=='q') || (ch==27)) break;
cycles.flying+=5;
if ((ch=='w') || (ch==APPLE_UP)) {
if (ram[SHIPY]>16) {
ram[SHIPY]-=2;
ram[SPACEZ_I]++;
update_z_factor();
}
ram[SPLASH_COUNT]=0;
}
cycles.flying+=5;
if ((ch=='s') || (ch==APPLE_DOWN)) {
if (ram[SHIPY]<28) {
ram[SHIPY]+=2;
ram[SPACEZ_I]--;
update_z_factor();
}
else {
ram[SPLASH_COUNT]=10;
}
}
cycles.flying+=5;
if ((ch=='a') || (ch==APPLE_LEFT)) {
if ((ram[TURNING]>0) && (!(ram[TURNING]&0x80))) {
ram[TURNING]=0;
}
else {
ram[TURNING]=250; // -5
ram[ANGLE]-=1;
if (ram[ANGLE]<0) ram[ANGLE]+=ANGLE_STEPS;
}
}
cycles.flying+=5;
if ((ch=='d') || (ch==APPLE_RIGHT)) {
if (ram[TURNING]>128) {
ram[TURNING]=0;
}
else {
ram[TURNING]=5;
ram[ANGLE]+=1;
if (ram[ANGLE]>=ANGLE_STEPS) ram[ANGLE]-=ANGLE_STEPS;
}
}
cycles.flying+=5;
/* Used to be able to go backwards */
if (ch=='z') {
if (ram[SPEED]<4) ram[SPEED]++;
}
cycles.flying+=5;
if (ch=='x') {
if (ram[SPEED]>0) ram[SPEED]--;
}
cycles.flying+=5;
if (ch==' ') {
ram[SPEED]=SPEED_STOPPED;
}
cycles.flying+=5;
if (ch=='h') {
print_help();
ram[DRAW_SKY]=2;
}
cycles.flying+=5;
/* Ending */
if (ch==13) {
int landing_color,tx,ty;
tx=ram[CX_I]; ty=ram[CY_I];
landing_color=lookup_map(tx,ty);
printf("Trying to land at %d %d\n",tx,ty);
printf("Color=%d\n",landing_color);
if (landing_color==12) {
int loop;
/* Land the ship */
for(loop=ram[SPACEZ_I];loop>0;loop--) {
update_z_factor();
draw_background_mode7();
cycles.put_sprite+=grsim_put_sprite(shadow_forward,CONST_SHIPX+3,31+ram[SPACEZ_I]);
cycles.put_sprite+=grsim_put_sprite(ship_forward,CONST_SHIPX,ram[SHIPY]);
page_flip();
usleep(200000);
ram[SPACEZ_I]--;
}
return 0;
}
else {
htab(11);
vtab(22);
move_cursor();
print_both_pages("NEED TO LAND ON GRASS!");
}
}
cycles.flying+=5;
// check_done:
cycles.flying+=14;
if (ram[SPEED]!=SPEED_STOPPED) {
cycles.flying--;
int ii;
ram[DX_I] = fixed_sin_scale[(ram[ANGLE]+4)&0xf].i; // cos
ram[DX_F] = fixed_sin_scale[(ram[ANGLE]+4)&0xf].f; // cos
ram[DY_I] = fixed_sin_scale[ram[ANGLE]&0xf].i;
ram[DY_F] = fixed_sin_scale[ram[ANGLE]&0xf].f;
cycles.flying+=54;
for(ii=0;ii<ram[SPEED];ii++) {
fixed_add(ram[CX_I],ram[CX_F],
ram[DX_I],ram[DX_F],
&ram[CX_I],&ram[CX_F]);
fixed_add(ram[CY_I],ram[CY_F],
ram[DY_I],ram[DY_F],
&ram[CY_I],&ram[CY_F]);
cycles.flying+=45;
}
cycles.flying--;
}
draw_background_mode7();
{ int landing_color,tx,ty;
tx=ram[CX_I]; ty=ram[CY_I];
landing_color=lookup_map(tx,ty);
if (landing_color==2) ram[OVER_LAND]=0;
else ram[OVER_LAND]=1;
}
cycles.flying+=31;
ram[DRAW_SPLASH]=0;
cycles.flying+=11;
if (ram[SPEED]>0) {
if ((ram[SHIPY]>25) && (ram[TURNING]!=0)) {
ram[SPLASH_COUNT]=1;
}
if ((!ram[OVER_LAND]) && (ram[SPLASH_COUNT])) {
ram[DRAW_SPLASH]=1;
}
}
if (ram[TURNING]==0) {
if (ram[DRAW_SPLASH]) {
cycles.put_sprite+=grsim_put_sprite(splash_forward,
CONST_SHIPX+1,ram[SHIPY]+9);
cycles.flying+=33;
}
cycles.put_sprite+=grsim_put_sprite(shadow_forward,CONST_SHIPX+3,31+ram[SPACEZ_I]);
cycles.put_sprite+=grsim_put_sprite(ship_forward,CONST_SHIPX,ram[SHIPY]);
cycles.flying+=46;
}
else if (ram[TURNING]>128) {
if (ram[DRAW_SPLASH]) {
cycles.put_sprite+=grsim_put_sprite(splash_left,
CONST_SHIPX+1,36);
cycles.flying+=28;
}
cycles.put_sprite+=grsim_put_sprite(shadow_left,CONST_SHIPX+3,31+ram[SPACEZ_I]);
cycles.put_sprite+=grsim_put_sprite(ship_left,CONST_SHIPX,ram[SHIPY]);
ram[TURNING]++;
cycles.flying+=48;
}
else {
if (ram[DRAW_SPLASH]) {
cycles.put_sprite+=grsim_put_sprite(splash_right,
CONST_SHIPX+1,36);
cycles.flying+=28;
}
cycles.put_sprite+=grsim_put_sprite(shadow_right,CONST_SHIPX+3,31+ram[SPACEZ_I]);
cycles.put_sprite+=grsim_put_sprite(ship_right,CONST_SHIPX,ram[SHIPY]);
ram[TURNING]--;
cycles.flying+=51;
}
cycles.flying+=17;
page_flip(); cycles.page_flip+=26;
cycles.flying+=9;
iterations++;
if (iterations==20) {
int total_cycles;
total_cycles=cycles.flying+cycles.getkey+
cycles.page_flip+cycles.multiply+
cycles.mode7+cycles.lookup_map+
cycles.put_sprite;
printf("Cycles: flying=%d\n",cycles.flying);
printf("Cycles: getkey=%d\n",cycles.getkey);
printf("Cycles: page_flip=%d\n",cycles.page_flip);
printf("Cycles: multiply=%d\n",cycles.multiply);
printf("Cycles: mode7=%d\n",cycles.mode7);
printf("Cycles: lookup_map=%d\n",cycles.lookup_map);
printf("Cycles: put_sprite=%d\n",cycles.put_sprite);
printf("Total = %d\n",total_cycles);
printf("Frame Rate = %.2lf fps\n",
(1000000.0 / (double)total_cycles));
iterations=0;
}
/* Limit to around 10 fps */
usleep(100000);
}
return 0;
}
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