mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-24 09:30:45 +00:00
290 lines
6.0 KiB
C
290 lines
6.0 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include "cv.h"
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#include "cvu.h"
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#define COLOR ((const cv_vmemp)0x2000)
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#define IMAGE ((const cv_vmemp)0x1c00)
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#define COLS 32
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#define ROWS 24
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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uintptr_t __at(0x6a) font_bitmap_a;
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uintptr_t __at(0x6c) font_bitmap_0;
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volatile bool vint;
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volatile uint_fast8_t vint_counter;
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void vint_handler(void)
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{
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vint = true;
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vint_counter++;
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}
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void setup_32_column_font() {
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cv_set_image_table(IMAGE);
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cvu_memtovmemcpy(0x1800, (void *)(font_bitmap_0 - '0'*8), 256*8);
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cv_set_character_pattern_t(0x1800);
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cv_set_screen_mode(CV_SCREENMODE_STANDARD);
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cv_set_color_table(COLOR);
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cvu_vmemset(COLOR, 0x30, 8); // set color for chars 0-63
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cvu_vmemset(COLOR+8, 0x50, 32-8); // set chars 63-255
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}
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char cursor_x;
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char cursor_y;
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void clrscr() {
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cvu_vmemset(IMAGE, ' ', COLS*ROWS);
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}
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#define LOCHAR 0x0
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#define HICHAR 0xff
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#define CHAR(ch) (ch-LOCHAR)
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byte getchar(byte x, byte y) {
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return cvu_vinb(IMAGE + y*COLS + x);
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}
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void putchar(byte x, byte y, byte attr) {
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cvu_voutb(attr, IMAGE + y*COLS + x);
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}
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void putstring(byte x, byte y, const char* string) {
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while (*string) {
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putchar(x++, y, CHAR(*string++));
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}
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}
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void wait_vsync() {
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vint = false;
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while (!vint) ;
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}
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void delay(byte i) {
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while (i--) {
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wait_vsync();
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}
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}
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////////// GAME DATA
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typedef struct {
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byte x;
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byte y;
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byte dir;
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word score;
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char head_attr;
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char tail_attr;
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char collided:1;
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char human:1;
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} Player;
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Player players[2];
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byte credits = 0;
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byte frames_per_move;
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#define START_SPEED 12
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#define MAX_SPEED 5
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#define MAX_SCORE 7
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///////////
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const char BOX_CHARS[8] = { '+', '+', '+', '+', '-', '-', '!', '!' };
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void draw_box(byte x, byte y, byte x2, byte y2, const char* chars) {
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byte x1 = x;
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putchar(x, y, chars[2]);
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putchar(x2, y, chars[3]);
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putchar(x, y2, chars[0]);
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putchar(x2, y2, chars[1]);
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while (++x < x2) {
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putchar(x, y, chars[5]);
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putchar(x, y2, chars[4]);
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}
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while (++y < y2) {
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putchar(x1, y, chars[6]);
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putchar(x2, y, chars[7]);
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}
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}
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void draw_playfield() {
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draw_box(0,1,COLS-1,ROWS-1,BOX_CHARS);
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putstring(0,0,"Plyr1:");
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putstring(20,0,"Plyr2:");
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putchar(7,0,CHAR(players[0].score+'0'));
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putchar(27,0,CHAR(players[1].score+'0'));
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}
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typedef enum { D_RIGHT, D_DOWN, D_LEFT, D_UP } dir_t;
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const char DIR_X[4] = { 1, 0, -1, 0 };
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const char DIR_Y[4] = { 0, 1, 0, -1 };
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void init_game() {
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memset(players, 0, sizeof(players));
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players[0].head_attr = CHAR('1');
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players[1].head_attr = CHAR('2');
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players[0].tail_attr = '@';
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players[1].tail_attr = '%';
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frames_per_move = START_SPEED;
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}
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void reset_players() {
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players[0].x = players[0].y = 5;
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players[0].dir = D_RIGHT;
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players[1].x = 25;
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players[1].y = 19;
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players[1].dir = D_LEFT;
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players[0].collided = players[1].collided = 0;
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}
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void draw_player(Player* p) {
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putchar(p->x, p->y, p->head_attr);
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}
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void move_player(Player* p) {
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putchar(p->x, p->y, p->tail_attr);
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p->x += DIR_X[p->dir];
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p->y += DIR_Y[p->dir];
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if (getchar(p->x, p->y) != CHAR(' '))
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p->collided = 1;
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draw_player(p);
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}
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void human_control(Player* p) {
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byte dir = 0xff;
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struct cv_controller_state cs;
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cv_get_controller_state(&cs, 0); // Read the controller.
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if (!p->human) return;
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if (cs.joystick & CV_LEFT) dir = D_LEFT;
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if (cs.joystick & CV_RIGHT) dir = D_RIGHT;
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if (cs.joystick & CV_UP) dir = D_UP;
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if (cs.joystick & CV_DOWN) dir = D_DOWN;
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// don't let the player reverse
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if (dir < 0x80 && dir != (p->dir ^ 2)) {
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p->dir = dir;
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}
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}
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byte ai_try_dir(Player* p, dir_t dir, byte shift) {
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byte x,y;
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dir &= 3;
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x = p->x + (DIR_X[dir] << shift);
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y = p->y + (DIR_Y[dir] << shift);
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if (x < 29 && y < 27 && getchar(x, y) == CHAR(' ')) {
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p->dir = dir;
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return 1;
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} else {
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return 0;
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}
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}
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void ai_control(Player* p) {
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dir_t dir;
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if (p->human) return;
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dir = p->dir;
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if (!ai_try_dir(p, dir, 0)) {
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ai_try_dir(p, dir+1, 0);
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ai_try_dir(p, dir-1, 0);
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} else {
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ai_try_dir(p, dir-1, 0) && ai_try_dir(p, dir-1, 1+(rand() & 3));
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ai_try_dir(p, dir+1, 0) && ai_try_dir(p, dir+1, 1+(rand() & 3));
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ai_try_dir(p, dir, rand() & 3);
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}
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}
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byte gameover;
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void flash_colliders() {
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byte i;
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// flash players that collided
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for (i=0; i<56; i++) {
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//cv_set_frequency(CV_SOUNDCHANNEL_0, 1000+i*8);
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//cv_set_attenuation(CV_SOUNDCHANNEL_0, i/2);
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if (players[0].collided) players[0].head_attr ^= 0x80;
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if (players[1].collided) players[1].head_attr ^= 0x80;
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delay(2);
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draw_player(&players[0]);
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draw_player(&players[1]);
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}
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//cv_set_attenuation(CV_SOUNDCHANNEL_0, 28);
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}
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void make_move() {
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byte i;
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for (i=0; i<frames_per_move; i++) {
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human_control(&players[0]);
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delay(1);
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}
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ai_control(&players[0]);
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ai_control(&players[1]);
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// if players collide, 2nd player gets the point
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move_player(&players[1]);
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move_player(&players[0]);
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}
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void play_game();
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void declare_winner(byte winner) {
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byte i;
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clrscr();
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for (i=0; i<ROWS/2-3; i++) {
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draw_box(i,i,COLS-1-i,ROWS-1-i,BOX_CHARS);
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delay(1);
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}
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putstring(12,10,"WINNER:");
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putstring(12,13,"PLAYER ");
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putchar(12+7, 13, CHAR('1')+winner);
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delay(75);
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gameover = 1;
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}
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void play_round() {
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reset_players();
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clrscr();
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draw_playfield();
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while (1) {
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make_move();
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if (players[0].collided || players[1].collided) break;
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}
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flash_colliders();
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// add scores to players that didn't collide
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if (players[0].collided) players[1].score++;
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if (players[1].collided) players[0].score++;
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// increase speed
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if (frames_per_move > MAX_SPEED) frames_per_move--;
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// game over?
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if (players[0].score != players[1].score) {
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if (players[0].score >= MAX_SCORE)
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declare_winner(0);
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else if (players[1].score >= MAX_SCORE)
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declare_winner(1);
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}
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}
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void play_game() {
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gameover = 0;
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init_game();
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players[0].human = 1;
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while (!gameover) {
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play_round();
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}
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}
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void main() {
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setup_32_column_font();
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cv_set_screen_active(true);
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cv_set_vint_handler(&vint_handler);
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draw_playfield();
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play_game();
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}
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