megadrive_test2

annotate src/main.c @ 9:6ecf2f3ff05a

- better pad input handling - switch between 28 and 30 vertical tiles by pressing C
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 24 Jun 2017 00:33:10 +0300
parents 403367d5df5a
children ca7108a82867
rev   line source
nuclear@1 1 #include <stdint.h>
nuclear@0 2 #include "vdp.h"
nuclear@6 3 #include "io.h"
nuclear@9 4 #include "pad.h"
nuclear@9 5 #include "intr.h"
nuclear@5 6 #include "tun_data.h"
nuclear@0 7
nuclear@5 8 #define NAMETAB_A 6
nuclear@5 9 #define NAMETAB_B 6
nuclear@5 10
nuclear@5 11 void load_pattern(int idx, void *data);
nuclear@5 12 void set_tile(int nametab_idx, int x, int y, int tile_idx, int palidx);
nuclear@5 13
nuclear@5 14 #define CYCLE_BEG 1
nuclear@5 15 #define CYCLE_END 14
nuclear@5 16 static uint16_t pal[16] = {
nuclear@5 17 VDP_PACK_RGB(0, 0, 0), /* 0: fixed */
nuclear@5 18 VDP_PACK_RGB(0, 0, 0), /* 1: cycle start */
nuclear@5 19 VDP_PACK_RGB(0, 0, 0), VDP_PACK_RGB(0, 0, 0),
nuclear@5 20 VDP_PACK_RGB(0, 0, 0), VDP_PACK_RGB(0, 0, 0),
nuclear@5 21 VDP_PACK_RGB(0, 0, 0), VDP_PACK_RGB(0, 0, 0),
nuclear@5 22 VDP_PACK_RGB(0, 0, 0), VDP_PACK_RGB(0, 0, 0),
nuclear@5 23 VDP_PACK_RGB(0, 0, 0), VDP_PACK_RGB(0, 0, 0),
nuclear@5 24 VDP_PACK_RGB(0, 0, 0), /* 12: \ */
nuclear@5 25 VDP_PACK_RGB(7, 0, 3), /* 13: > beam */
nuclear@5 26 VDP_PACK_RGB(0, 0, 0), /* 14: / cycle end */
nuclear@5 27 VDP_PACK_RGB(7, 0, 3) /* 15: fixed */
nuclear@4 28 };
nuclear@4 29
nuclear@4 30
nuclear@0 31 int main(void)
nuclear@0 32 {
nuclear@4 33 int i, j;
nuclear@4 34
nuclear@0 35 vdp_init();
nuclear@0 36
nuclear@6 37 if(IO_REG_VER & IO_VER_PAL) {
nuclear@6 38 vdp_setreg(VDP_REG_MODE2, vdp_getreg(VDP_REG_MODE2) | VDP_MODE2_V30CELL);
nuclear@6 39 }
nuclear@5 40
nuclear@5 41 vdp_begin_palette(0, 0);
nuclear@5 42 for(i=0; i<16; i++) {
nuclear@5 43 VDP_PORT_DATA = pal[i];
nuclear@5 44 }
nuclear@0 45
nuclear@5 46 for(i=0; i<tun_xtiles * tun_ytiles; i++) {
nuclear@5 47 load_pattern(i, tun_tiles[i]);
nuclear@5 48 }
nuclear@4 49
nuclear@5 50 vdp_set_nametab_idx(VDP_PLANE_A, NAMETAB_A);
nuclear@5 51 vdp_set_nametab_idx(VDP_PLANE_B, NAMETAB_B);
nuclear@4 52
nuclear@5 53 for(i=0; i<tun_ytiles; i++) {
nuclear@5 54 for(j=0; j<tun_xtiles; j++) {
nuclear@5 55 set_tile(NAMETAB_A, j, i, i * tun_xtiles + j, 0);
nuclear@4 56 }
nuclear@4 57 }
nuclear@4 58
nuclear@4 59 //vdp_enable_hintr(12);
nuclear@5 60 vdp_enable_vintr();
nuclear@1 61
nuclear@8 62 for(;;) {
nuclear@9 63 pad_update(0);
nuclear@8 64
nuclear@9 65 if(pad_pressed(0, IO_PAD_C)) {
nuclear@9 66 disable_intr();
nuclear@9 67 vdp_setreg(VDP_REG_MODE2, vdp_getreg(VDP_REG_MODE2) ^ VDP_MODE2_V30CELL);
nuclear@9 68 enable_intr();
nuclear@8 69 }
nuclear@8 70
nuclear@8 71 vdp_wait_vblank();
nuclear@8 72 }
nuclear@0 73
nuclear@0 74 return 0;
nuclear@0 75 }
nuclear@1 76
nuclear@4 77 void load_pattern(int idx, void *data)
nuclear@4 78 {
nuclear@4 79 int i;
nuclear@4 80 uint32_t *ptr = data;
nuclear@4 81 uint16_t addr = idx << 5;
nuclear@4 82 vdp_setup_access(addr, VDP_MEM_WRITE, VDP_MEM_VRAM);
nuclear@4 83
nuclear@4 84 for(i=0; i<16; i++) {
nuclear@4 85 VDP_PORT_DATA32 = *ptr++;
nuclear@4 86 }
nuclear@4 87 }
nuclear@4 88
nuclear@5 89 void set_tile(int nametab_idx, int x, int y, int tile_idx, int palidx)
nuclear@4 90 {
nuclear@4 91 uint16_t tile_ent, addr;
nuclear@4 92
nuclear@4 93 tile_ent = vdp_nametab_entry(tile_idx, palidx, VDP_TILE_LOW_PRIO);
nuclear@4 94
nuclear@5 95 addr = vdp_nametab_addr(nametab_idx) + (y * 64 + x) * 2;
nuclear@4 96 vdp_setup_access(addr, VDP_MEM_WRITE, VDP_MEM_VRAM);
nuclear@4 97 VDP_PORT_DATA = tile_ent;
nuclear@4 98 }
nuclear@5 99
nuclear@5 100 void vblank_handler(void)
nuclear@5 101 {
nuclear@5 102 int idx = CYCLE_BEG;
nuclear@8 103 uint16_t first;
nuclear@8 104
nuclear@8 105 first = pal[idx];
nuclear@5 106
nuclear@5 107 vdp_begin_palette(0, idx);
nuclear@5 108 while(idx < CYCLE_END) {
nuclear@5 109 pal[idx] = pal[idx + 1];
nuclear@5 110 VDP_PORT_DATA = pal[idx];
nuclear@5 111 ++idx;
nuclear@5 112 }
nuclear@5 113 pal[idx] = first;
nuclear@5 114 VDP_PORT_DATA = pal[idx];
nuclear@5 115 }