static void nes_vh_start(ppu_t ppu_type, double scanlines_per_frame)
{
ppu2c0x_interface ppu_interface;
nes_zapper_hack = NULL;
memset(&ppu_interface, 0, sizeof(ppu_interface));
ppu_interface.type = ppu_type;
ppu_interface.num = 1;
ppu_interface.vrom_region[0] = nes.chr_chunks ? REGION_GFX1 : REGION_INVALID;
ppu_interface.mirroring[0] = PPU_MIRROR_NONE;
ppu_interface.nmi_handler[0] = ppu_nmi;
ppu2c0x_init(&ppu_interface);
ppu2c0x_set_vidaccess_callback(0, nes_ppu_vidaccess);
ppu2c0x_set_scanlines_per_frame(0, ceil(scanlines_per_frame));
if (nes.four_screen_vram)
{
ppu2c0x_set_mirroring(0, PPU_MIRROR_4SCREEN);
}
else
{
switch(nes.hard_mirroring)
{
case 0:
ppu2c0x_set_mirroring(0, PPU_MIRROR_HORZ);
break;
case 1:
ppu2c0x_set_mirroring(0, PPU_MIRROR_VERT);
break;
}
}
add_reset_callback(Machine, nes_vh_reset);
/* Reset the mapper variables. Will also mark the char-gen ram as dirty */
mapper_reset(nes.mapper);
}
static void nes_vh_reset( running_machine &machine )
{
nes_state *state = machine.driver_data<nes_state>();
ppu2c0x_set_vidaccess_callback(machine.device("ppu"), nes_ppu_vidaccess);
if (state->m_four_screen_vram)
set_nt_mirroring(machine, PPU_MIRROR_4SCREEN);
else
{
switch (state->m_hard_mirroring)
{
case PPU_MIRROR_HORZ:
case PPU_MIRROR_VERT:
case PPU_MIRROR_HIGH:
case PPU_MIRROR_LOW:
set_nt_mirroring(machine, state->m_hard_mirroring);
break;
default:
set_nt_mirroring(machine, PPU_MIRROR_NONE);
break;
}
}
}