git.mutantstargoat.com Git - megatris/blob - src/vdp.c

   1 #include "vdp.h"
   2
   3 void vdp_init(void)
   4 {
   5         int i;
   6
   7         vdp_setreg(VDP_REG_MODE1, VDP_MODE1_BASE);
   8         vdp_setreg(VDP_REG_MODE2, VDP_MODE2_BASE | VDP_MODE2_DISP);
   9
  10         vdp_set_nametab_addr(VDP_PLANE_A, 0xc000);
  11         vdp_set_nametab_addr(VDP_PLANE_B, 0xe000);
  12         vdp_disable_layer(VDP_PLANE_WIN);
  13         vdp_set_scroll_table(0xd000);
  14         vdp_set_sprite_table(0xd400);
  15
  16         vdp_setreg(VDP_REG_MODE3, VDP_MODE3_BASE);
  17         vdp_setreg(VDP_REG_MODE4, VDP_MODE4_BASE | VDP_MODE4_H40CELL);
  18         vdp_setreg(VDP_REG_SCROLL_SIZE, VDP_SCROLL_H64 | VDP_SCROLL_V32);
  19
  20         vdp_set_autoinc(2);
  21         vdp_set_bgcolor(0, 0);
  22
  23         vdp_setreg(VDP_REG_HINTR, 0);
  24         vdp_setreg(VDP_REG_WIN_XPOS, 0);
  25         vdp_setreg(VDP_REG_WIN_YPOS, 0);
  26
  27         /* clear vmem at the planes A/B name tables, scroll table, and sprite table */
  28         vdp_setup_access(0xd000, VDP_MEM_WRITE, VDP_MEM_VRAM);
  29         for(i=0xd000; i<65536; i++) {
  30                 VDP_PORT_DATA = 0;
  31         }
  32 }