mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-10-31 09:16:03 +00:00
585 lines
12 KiB
C
585 lines
12 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <math.h>
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#include "gr-sim.h"
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#include "6502_emulate.h"
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#include "tfv_utils.h"
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#include "tfv_zp.h"
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#include "tfv_sprites.h"
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#include "tfv_multiply.c"
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/* Mode7 code based on code from: */
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/* http://www.helixsoft.nl/articles/circle/sincos.htm */
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static unsigned char flying_map[64]= {
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2,15,15,15, 15,15,15, 2,
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13,12,12, 8, 4, 4, 0,13,
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13,12,12,12, 8, 4, 4,13,
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13,12,12, 8, 4, 4, 4,13,
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13,12, 9, 9, 8, 4, 4,13,
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13,12, 9, 8, 4, 4, 4,13,
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13,12, 9, 9, 1, 4, 4,13,
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2,13,13,13, 13,13,13, 2};
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static unsigned char water_map[32]={
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2,2,2,2, 2,2,2,2,
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14,2,2,2, 2,2,2,2,
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2, 2,2,2, 2,2,2,2,
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2,2,2,2, 14,2,2,2,
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};
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#define TILE_W 64
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#define TILE_H 64
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#define MASK_X (TILE_W - 1)
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#define MASK_Y (TILE_H - 1)
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#define LOWRES_W 40
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#define LOWRES_H 40
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static int displayed=0;
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static int over_water=0;
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static int lookup_map(int xx, int yy) {
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int color,offset;
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color=2;
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xx=xx&MASK_X;
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yy=yy&MASK_Y;
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if (!displayed) {
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printf("XX,YY! %x,%x\n",xx,yy);
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}
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// if ( ((y&0x3)==1) && ((x&7)==0) ) color=14;
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// if ( ((y&0x3)==3) && ((x&7)==4) ) color=14;
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offset=yy<<3;
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offset+=xx;
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// color=water_map[((yy*8)+xx)&0x1f];
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color=water_map[offset&0x1f];
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/* 2 2 2 2 2 2 2 2 */
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/* e 2 2 2 2 2 2 2 */
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/* 2 2 2 2 2 2 2 2 */
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/* 2 2 2 2 e 2 2 2 */
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if ((yy<8) && (xx<8)) {
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color=flying_map[offset];
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}
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if (!displayed) {
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printf("COLOR! %x\n",color);
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}
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return color;
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}
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// current screen position
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static int screen_x, screen_y;
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static char angle=1;
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// Speed
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#define SPEED_STOPPED 0
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static unsigned char speed=SPEED_STOPPED; // 0..4, with 0=stopped
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// map coordinates
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static struct fixed_type cx = {0,0};
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static struct fixed_type cy = {0,0};
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static struct fixed_type dx;
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static struct fixed_type dy;
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// the distance and horizontal scale of the line we are drawing
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static struct fixed_type distance;
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static struct fixed_type horizontal_scale;
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// current space position
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static struct fixed_type space_x;
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static struct fixed_type space_y;
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// height of the camera above the plane
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static struct fixed_type space_z= {0x04,0x80}; // 4.5;
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static struct fixed_type BETA = {0xff,0x80}; // -0.5;
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static struct fixed_type factor;
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static struct fixed_type fixed_temp;
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static struct fixed_type scale={0x14,0x00}; // 20.0
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#define ANGLE_STEPS 16
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// FIXME: take advantage of symmetry?
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static struct fixed_type fixed_sin[ANGLE_STEPS]={
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{0x00,0x00}, // 0.000000=00.00
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{0x00,0x61}, // 0.382683=00.61
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{0x00,0xb5}, // 0.707107=00.b5
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{0x00,0xec}, // 0.923880=00.ec
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{0x01,0x00}, // 1.000000=01.00
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{0x00,0xec}, // 0.923880=00.ec
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{0x00,0xb5}, // 0.707107=00.b5
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{0x00,0x61}, // 0.382683=00.61
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{0x00,0x00}, // 0.000000=00.00
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{0xff,0x9f}, // -0.382683=ff.9f
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{0xff,0x4b}, // -0.707107=ff.4b
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{0xff,0x14}, // -0.923880=ff.14
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{0xff,0x00}, // -1.000000=ff.00
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{0xff,0x14}, // -0.923880=ff.14
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{0xff,0x4b}, // -0.707107=ff.4b
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{0xff,0x9f}, // -0.382683=ff.9f
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};
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// div by 8
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static struct fixed_type fixed_sin_scale[ANGLE_STEPS]={
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{0x00,0x00},
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{0x00,0x0c},
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{0x00,0x16},
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{0x00,0x1d},
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{0x00,0x20},
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{0x00,0x1d},
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{0x00,0x16},
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{0x00,0x0c},
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{0x00,0x00},
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{0xff,0xf4},
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{0xff,0xea},
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{0xff,0xe3},
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{0xff,0xe0},
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{0xff,0xe3},
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{0xff,0xea},
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{0xff,0xf4},
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};
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static unsigned char horizontal_lookup[7][16] = {
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{0x0C,0x0A,0x09,0x08,0x07,0x06,0x05,0x05,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,},
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{0x26,0x20,0x1B,0x18,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0C,0x0C,0x0B,0x0A,0x0A,0x09,},
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{0x40,0x35,0x2D,0x28,0x23,0x20,0x1D,0x1A,0x18,0x16,0x15,0x14,0x12,0x11,0x10,0x10,},
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{0x59,0x4A,0x40,0x38,0x31,0x2C,0x28,0x25,0x22,0x20,0x1D,0x1C,0x1A,0x18,0x17,0x16,},
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{0x73,0x60,0x52,0x48,0x40,0x39,0x34,0x30,0x2C,0x29,0x26,0x24,0x21,0x20,0x1E,0x1C,},
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{0x8C,0x75,0x64,0x58,0x4E,0x46,0x40,0x3A,0x36,0x32,0x2E,0x2C,0x29,0x27,0x25,0x23,},
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{0xA6,0x8A,0x76,0x68,0x5C,0x53,0x4B,0x45,0x40,0x3B,0x37,0x34,0x30,0x2E,0x2B,0x29,},
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};
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double fixed_to_double(struct fixed_type *f) {
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double out;
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out=f->i;
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out+=((double)(f->f))/256.0;
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return out;
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}
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static void fixed_add(struct fixed_type *x, struct fixed_type *y, struct fixed_type *z) {
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int carry;
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short sum;
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sum=(short)(x->f)+(short)(y->f);
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if (sum>=256) carry=1;
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else carry=0;
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z->f=sum&0xff;
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z->i=x->i+y->i+carry;
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}
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//static void double_to_fixed(double d, struct fixed_type *f) {
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//
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// int temp;
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//
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// temp=d*256;
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//
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// f->i=(temp>>8)&0xff;
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//
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// f->f=temp&0xff;
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//}
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//
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// Non-detailed version
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//
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//
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void draw_background_mode7(void) {
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int map_color;
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over_water=0;
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/* Draw Sky */
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/* Originally wanted to be fancy and have sun too, but no */
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color_equals(COLOR_MEDIUMBLUE);
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for(screen_y=0;screen_y<6;screen_y+=2) {
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hlin_double(ram[DRAW_PAGE], 0, 40, screen_y);
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}
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/* Draw hazy horizon */
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color_equals(COLOR_GREY);
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hlin_double(ram[DRAW_PAGE], 0, 40, 6);
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// fixed_to_double(&space_z,&double_space_z);
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// double_factor=double_space_z*double_BETA;
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fixed_mul(&space_z,&BETA,&factor,0);
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if (!displayed) {
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printf("SPACEZ/BETA/FACTOR %x %x * %x %x = %x %x\n",
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space_z.i,space_z.f,BETA.i,BETA.f,factor.i,factor.f);
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}
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// printf("spacez=%lf beta=%lf factor=%lf\n",
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// fixed_to_double(&space_z),
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// fixed_to_double(&BETA),
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// fixed_to_double(&factor));
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for (screen_y = 8; screen_y < LOWRES_H; screen_y+=2) {
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// then calculate the horizontal scale, or the distance between
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// space points on this horizontal line
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// double_horizontal_scale = double_space_z / (screen_y + horizon);
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// double_to_fixed(double_horizontal_scale,&horizontal_scale);
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horizontal_scale.i=0;
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horizontal_scale.f=
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horizontal_lookup[space_z.i&0xf][(screen_y-8)/2];
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if (!displayed) {
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printf("HORIZ_SCALE %x %x\n",
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horizontal_scale.i,horizontal_scale.f);
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}
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// calculate the distance of the line we are drawing
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fixed_mul(&horizontal_scale,&scale,&distance,0);
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//fixed_to_double(&distance,&double_distance);
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// printf("Distance=%lf, horizontal-scale=%lf\n",
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// distance,horizontal_scale);
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if (!displayed) {
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printf("DISTANCE %x:%x\n",
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distance.i,distance.f);
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}
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// calculate the dx and dy of points in space when we step
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// through all points on this line
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dx.i=fixed_sin[(angle+8)&0xf].i; // -sin()
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dx.f=fixed_sin[(angle+8)&0xf].f; // -sin()
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fixed_mul(&dx,&horizontal_scale,&dx,0);
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if (!displayed) {
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printf("DX %x:%x\n",
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dx.i,dx.f);
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}
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dy.i=fixed_sin[(angle+4)&0xf].i; // cos()
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dy.f=fixed_sin[(angle+4)&0xf].f; // cos()
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fixed_mul(&dy,&horizontal_scale,&dy,0);
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if (!displayed) {
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printf("DY %x:%x\n",
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dy.i,dy.f);
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}
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// calculate the starting position
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//double_space_x =(double_distance+double_factor);
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fixed_add(&distance,&factor,&space_x);
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// double_to_fixed(double_space_x,&space_x);
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fixed_temp.i=fixed_sin[(angle+4)&0xf].i; // cos
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fixed_temp.f=fixed_sin[(angle+4)&0xf].f; // cos
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fixed_mul(&space_x,&fixed_temp,&space_x,0);
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fixed_add(&space_x,&cx,&space_x);
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fixed_temp.i=0xec; // -20 (LOWRES_W/2)
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fixed_temp.f=0;
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fixed_mul(&fixed_temp,&dx,&fixed_temp,0);
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fixed_add(&space_x,&fixed_temp,&space_x);
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if (!displayed) {
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printf("SPACEX! %x:%x\n",
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space_x.i,space_x.f);
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}
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fixed_add(&distance,&factor,&space_y);
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// double_space_y =(double_distance+double_factor);
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// double_to_fixed(double_space_y,&space_y);
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fixed_temp.i=fixed_sin[angle&0xf].i;
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fixed_temp.f=fixed_sin[angle&0xf].f;
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fixed_mul(&space_y,&fixed_temp,&space_y,0);
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fixed_add(&space_y,&cy,&space_y);
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fixed_temp.i=0xec; // -20 (LOWRES_W/2)
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fixed_temp.f=0;
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fixed_mul(&fixed_temp,&dy,&fixed_temp,0);
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fixed_add(&space_y,&fixed_temp,&space_y);
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if (!displayed) {
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printf("SPACEY! %x:%x\n",
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space_y.i,space_y.f);
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}
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// go through all points in this screen line
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for (screen_x = 0; screen_x < LOWRES_W-1; screen_x++) {
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// get a pixel from the tile and put it on the screen
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map_color=lookup_map(space_x.i,space_y.i);
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ram[COLOR]=map_color;
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ram[COLOR]|=map_color<<4;
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if ((screen_x==20) && (screen_y==38)) {
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if (map_color==COLOR_DARKBLUE) over_water=1;
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}
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hlin_double(ram[DRAW_PAGE], screen_x, screen_x+1,
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screen_y);
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// advance to the next position in space
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fixed_add(&space_x,&dx,&space_x);
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fixed_add(&space_y,&dy,&space_y);
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}
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}
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displayed=1;
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}
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#define SHIPX 15
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int flying(void) {
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unsigned char ch;
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int shipy;
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int turning=0;
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int draw_splash=0,splash_count=0;
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int zint;
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/************************************************/
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/* Flying */
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/************************************************/
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gr();
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ram[DRAW_PAGE]=PAGE0;
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clear_bottom();
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ram[DRAW_PAGE]=PAGE1;
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clear_bottom();
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shipy=20;
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while(1) {
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if (splash_count>0) splash_count--;
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ch=grsim_input();
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if ((ch=='q') || (ch==27)) break;
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#if 0
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if (ch=='g') {
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BETA+=0.1;
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printf("Horizon=%lf\n",BETA);
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}
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if (ch=='h') {
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BETA-=0.1;
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printf("Horizon=%lf\n",BETA);
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}
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if (ch=='s') {
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scale_x++;
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scale_y++;
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printf("Scale=%lf\n",scale_x);
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}
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#endif
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if ((ch=='w') || (ch==APPLE_UP)) {
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if (shipy>16) {
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shipy-=2;
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space_z.i++;
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}
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splash_count=0;
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// printf("Z=%lf\n",space_z);
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}
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if ((ch=='s') || (ch==APPLE_DOWN)) {
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if (shipy<28) {
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shipy+=2;
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space_z.i--;
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}
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else {
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splash_count=10;
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}
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// printf("Z=%lf\n",space_z);
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}
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if ((ch=='a') || (ch==APPLE_LEFT)) {
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if (turning>0) {
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turning=0;
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}
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else {
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turning=-20;
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angle-=1;
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if (angle<0) angle+=ANGLE_STEPS;
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}
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}
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if ((ch=='d') || (ch==APPLE_RIGHT)) {
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if (turning<0) {
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turning=0;
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}
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else {
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turning=20;
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angle+=1;
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if (angle>=ANGLE_STEPS) angle-=ANGLE_STEPS;
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}
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}
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/* Used to be able to go backwards */
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if (ch=='z') {
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if (speed<3) speed++;
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}
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if (ch=='x') {
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if (speed>0) speed--;
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}
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if (ch==' ') {
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speed=SPEED_STOPPED;
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}
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if (ch=='h') {
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print_help();
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}
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/* Ending */
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if (ch==13) {
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int landing_color,tx,ty;
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tx=cx.i; ty=cy.i;
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landing_color=lookup_map(tx,ty);
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printf("Trying to land at %d %d\n",tx,ty);
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printf("Color=%d\n",landing_color);
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if (landing_color==12) {
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int loop;
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zint=space_z.i;
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/* Land the ship */
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for(loop=zint;loop>0;loop--) {
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draw_background_mode7();
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grsim_put_sprite(shadow_forward,SHIPX+3,31+zint);
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grsim_put_sprite(ship_forward,SHIPX,shipy);
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page_flip();
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usleep(200000);
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space_z.i--;
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}
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return 0;
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}
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else {
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htab(11);
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vtab(22);
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move_cursor();
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print_both_pages("NEED TO LAND ON GRASS!");
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}
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}
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if (speed!=SPEED_STOPPED) {
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int ii;
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dx.i = fixed_sin_scale[(angle+4)&0xf].i; // cos
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dx.f = fixed_sin_scale[(angle+4)&0xf].f; // cos
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dy.i = fixed_sin_scale[angle&0xf].i;
|
|
dy.f = fixed_sin_scale[angle&0xf].f;
|
|
|
|
for(ii=0;ii<speed;ii++) {
|
|
fixed_add(&cx,&dx,&cx);
|
|
fixed_add(&cy,&dy,&cy);
|
|
}
|
|
|
|
}
|
|
|
|
draw_background_mode7();
|
|
|
|
zint=space_z.i;
|
|
|
|
draw_splash=0;
|
|
|
|
|
|
if (speed>0) {
|
|
|
|
if ((shipy>25) && (turning!=0)) {
|
|
splash_count=1;
|
|
}
|
|
|
|
if ((over_water) && (splash_count)) {
|
|
draw_splash=1;
|
|
}
|
|
}
|
|
|
|
// printf("VMW: %d %d\n",draw_splash,splash_count);
|
|
|
|
if (turning==0) {
|
|
if (draw_splash) {
|
|
grsim_put_sprite(splash_forward,
|
|
SHIPX+1,shipy+9);
|
|
}
|
|
grsim_put_sprite(shadow_forward,SHIPX+3,31+zint);
|
|
grsim_put_sprite(ship_forward,SHIPX,shipy);
|
|
}
|
|
if (turning<0) {
|
|
|
|
if (draw_splash) {
|
|
grsim_put_sprite(splash_left,
|
|
SHIPX+1,36);
|
|
}
|
|
grsim_put_sprite(shadow_left,SHIPX+3,31+zint);
|
|
grsim_put_sprite(ship_left,SHIPX,shipy);
|
|
turning++;
|
|
}
|
|
if (turning>0) {
|
|
|
|
if (draw_splash) {
|
|
grsim_put_sprite(splash_right,
|
|
SHIPX+1,36);
|
|
}
|
|
grsim_put_sprite(shadow_right,SHIPX+3,31+zint);
|
|
grsim_put_sprite(ship_right,SHIPX,shipy);
|
|
turning--;
|
|
}
|
|
|
|
page_flip();
|
|
|
|
usleep(20000);
|
|
|
|
}
|
|
return 0;
|
|
}
|