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Add CGB-D support

This commit is contained in:
Lior Halphon 2021-10-27 01:40:28 +03:00
parent 5b9746084d
commit e6c4ceaf5a
7 changed files with 63 additions and 29 deletions
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2
Cocoa/Preferences.xib
View File

@ -401,7 +401,7 @@
<menuItem title="CPU-CGB A" tag="513" enabled="NO" id="axv-yk-RWM"/>
<menuItem title="CPU-CGB B" tag="514" enabled="NO" id="NtJ-oo-IM2"/>
<menuItem title="CPU-CGB C (Experimental)" tag="515" id="9YL-u8-12z"/>
<menuItem title="CPU-CGB D" tag="516" enabled="NO" id="c76-oF-fkU"/>
<menuItem title="CPU-CGB D" tag="516" id="c76-oF-fkU"/>
<menuItem title="CPU-CGB E" state="on" tag="517" id="3lF-1Q-2SS"/>
</items>
</menu>

14
Core/apu.c
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@ -901,7 +901,6 @@ static inline uint16_t effective_channel4_counter(GB_gameboy_t *gb)
effective_counter |= 0x20;
}
break;
#if 0
case GB_MODEL_CGB_D:
if (effective_counter & ((gb->io_registers[GB_IO_NR43] & 8)? 0x40 : 0x80)) { // This is so weird
effective_counter |= 0xFF;
@ -922,7 +921,6 @@ static inline uint16_t effective_channel4_counter(GB_gameboy_t *gb)
effective_counter |= 0x10;
}
break;
#endif
case GB_MODEL_CGB_E:
if (effective_counter & ((gb->io_registers[GB_IO_NR43] & 8)? 0x40 : 0x80)) { // This is so weird
effective_counter |= 0xFF;
@ -1067,7 +1065,7 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
if ((value & 0x80) == 0 && gb->apu.is_active[index]) {
/* On an AGB, as well as on CGB C and earlier (TODO: Tested: 0, B and C), it behaves slightly different on
double speed. */
if (gb->model == GB_MODEL_CGB_E /* || gb->model == GB_MODEL_CGB_D */ || gb->apu.square_channels[index].sample_countdown & 1) {
if (gb->model == GB_MODEL_CGB_E || gb->model == GB_MODEL_CGB_D || gb->apu.square_channels[index].sample_countdown & 1) {
if (gb->apu.square_channels[index].sample_countdown >> 1 == (gb->apu.square_channels[index].sample_length ^ 0x7FF)) {
gb->apu.square_channels[index].current_sample_index--;
gb->apu.square_channels[index].current_sample_index &= 7;
@ -1091,7 +1089,7 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
}
else {
unsigned extra_delay = 0;
if (gb->model == GB_MODEL_CGB_E /* || gb->model == GB_MODEL_CGB_D */) {
if (gb->model == GB_MODEL_CGB_E || gb->model == GB_MODEL_CGB_D) {
if (!(value & 4) && !(((gb->apu.square_channels[index].sample_countdown - 1) / 2) & 0x400)) {
gb->apu.square_channels[index].current_sample_index++;
gb->apu.square_channels[index].current_sample_index &= 0x7;
@ -1153,10 +1151,12 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
else {
gb->apu.sweep_length_addend = 0;
}
gb->apu.channel_1_restart_hold = 2 - gb->apu.lf_div + GB_is_cgb(gb) * 2;
if (gb->model <= GB_MODEL_CGB_C && gb->apu.lf_div) {
gb->apu.channel_1_restart_hold = 2 - gb->apu.lf_div + (GB_is_cgb(gb) && gb->model != GB_MODEL_CGB_D) * 2;
/*
if (GB_is_cgb(gb) && gb->model <= GB_MODEL_CGB_C && gb->apu.lf_div) {
// TODO: This if makes channel_1_sweep_restart_2 fail on CGB-C mode
gb->apu.channel_1_restart_hold += 2;
}
}*/
gb->apu.square_sweep_countdown = ((gb->io_registers[GB_IO_NR10] >> 4) & 7) ^ 7;
}
}

53
Core/display.c
View File

@ -483,18 +483,29 @@ static void add_object_from_index(GB_gameboy_t *gb, unsigned index)
}
}
static uint8_t data_for_tile_sel_glitch(GB_gameboy_t *gb, bool *should_use)
static uint8_t data_for_tile_sel_glitch(GB_gameboy_t *gb, bool *should_use, bool *cgb_d_glitch)
{
/*
Based on Matt Currie's research here:
https://github.com/mattcurrie/mealybug-tearoom-tests/blob/master/the-comprehensive-game-boy-ppu-documentation.md#tile_sel-bit-4
*/
*should_use = true;
*cgb_d_glitch = false;
if (gb->io_registers[GB_IO_LCDC] & 0x10) {
*should_use = !(gb->current_tile & 0x80);
/* if (gb->model != GB_MODEL_CGB_D) */ return gb->current_tile;
// TODO: CGB D behaves differently
if (gb->model != GB_MODEL_CGB_D) {
*should_use = !(gb->current_tile & 0x80);
return gb->current_tile;
}
*cgb_d_glitch = true;
*should_use = false;
gb->io_registers[GB_IO_LCDC] &= ~0x10;
if (gb->fetcher_state == 3) {
*should_use = false;
*cgb_d_glitch = true;
return 0;
}
return 0;
}
return gb->data_for_sel_glitch;
}
@ -694,8 +705,9 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
case GB_FETCHER_GET_TILE_DATA_LOWER: {
bool use_glitched = false;
bool cgb_d_glitch = false;
if (gb->tile_sel_glitch) {
gb->current_tile_data[0] = data_for_tile_sel_glitch(gb, &use_glitched);
gb->current_tile_data[0] = data_for_tile_sel_glitch(gb, &use_glitched, &cgb_d_glitch);
}
uint8_t y_flip = 0;
uint16_t tile_address = 0;
@ -721,13 +733,19 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
gb->current_tile_data[0] = 0xFF;
}
}
else {
if ((gb->io_registers[GB_IO_LCDC] & 0x10) && gb->tile_sel_glitch) {
gb->data_for_sel_glitch =
gb->vram[tile_address + ((y & 7) ^ y_flip) * 2];
if (gb->vram_ppu_blocked) {
gb->data_for_sel_glitch = 0xFF;
}
}
else if (cgb_d_glitch) {
gb->data_for_sel_glitch = gb->vram[gb->current_tile * 0x10 + ((y & 7) ^ y_flip) * 2];
if (gb->vram_ppu_blocked) {
gb->data_for_sel_glitch = 0xFF;
}
}
}
gb->fetcher_state++;
break;
@ -736,8 +754,9 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
/* Todo: Verified for DMG (Tested: SGB2), CGB timing is wrong. */
bool use_glitched = false;
bool cgb_d_glitch = false;
if (gb->tile_sel_glitch) {
gb->current_tile_data[1] = data_for_tile_sel_glitch(gb, &use_glitched);
gb->current_tile_data[1] = data_for_tile_sel_glitch(gb, &use_glitched, &cgb_d_glitch);
}
uint16_t tile_address = 0;
@ -756,7 +775,7 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
if (gb->current_tile_attributes & 0x40) {
y_flip = 0x7;
}
gb->last_tile_data_address = tile_address + ((y & 7) ^ y_flip) * 2 + 1;
gb->last_tile_data_address = tile_address + ((y & 7) ^ y_flip) * 2 + 1 - cgb_d_glitch;
if (!use_glitched) {
gb->current_tile_data[1] =
gb->vram[gb->last_tile_data_address];
@ -764,12 +783,16 @@ static void advance_fetcher_state_machine(GB_gameboy_t *gb)
gb->current_tile_data[1] = 0xFF;
}
}
else {
if ((gb->io_registers[GB_IO_LCDC] & 0x10) && gb->tile_sel_glitch) {
gb->data_for_sel_glitch = gb->vram[gb->last_tile_data_address];
if (gb->vram_ppu_blocked) {
gb->data_for_sel_glitch = 0xFF;
}
if ((gb->io_registers[GB_IO_LCDC] & 0x10) && gb->tile_sel_glitch) {
gb->data_for_sel_glitch = gb->vram[gb->last_tile_data_address];
if (gb->vram_ppu_blocked) {
gb->data_for_sel_glitch = 0xFF;
}
}
else if (cgb_d_glitch) {
gb->data_for_sel_glitch = gb->vram[gb->current_tile * 0x10 + ((y & 7) ^ y_flip) * 2 + 1];
if (gb->vram_ppu_blocked) {
gb->data_for_sel_glitch = 0xFF;
}
}
}

16
Core/gb.c
View File

@ -1473,12 +1473,23 @@ static void reset_ram(GB_gameboy_t *gb)
}
}
break;
case GB_MODEL_CGB_D:
for (unsigned i = 0; i < gb->ram_size; i++) {
gb->ram[i] = GB_random();
if (i & 0x800) {
gb->ram[i] &= GB_random();
}
else {
gb->ram[i] |= GB_random();
}
}
break;
}
/* HRAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
// case GB_MODEL_CGB_D:
case GB_MODEL_CGB_D:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
for (unsigned i = 0; i < sizeof(gb->hram); i++) {
@ -1508,6 +1519,7 @@ static void reset_ram(GB_gameboy_t *gb)
/* OAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_D:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
/* Zero'd out by boot ROM anyway*/
@ -1538,6 +1550,7 @@ static void reset_ram(GB_gameboy_t *gb)
/* Wave RAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_D:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
/* Initialized by CGB-A and newer, 0s in CGB-0*/
@ -1610,6 +1623,7 @@ static void request_boot_rom(GB_gameboy_t *gb)
type = GB_BOOT_ROM_SGB2;
break;
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_D:
case GB_MODEL_CGB_E:
type = GB_BOOT_ROM_CGB;
break;

2
Core/gb.h
View File

@ -134,7 +134,7 @@ typedef enum {
// GB_MODEL_CGB_A = 0x201,
// GB_MODEL_CGB_B = 0x202,
GB_MODEL_CGB_C = 0x203,
// GB_MODEL_CGB_D = 0x204,
GB_MODEL_CGB_D = 0x204,
GB_MODEL_CGB_E = 0x205,
GB_MODEL_AGB = 0x206,
} GB_model_t;

4
Core/memory.c
View File

@ -496,13 +496,11 @@ static uint8_t read_high_memory(GB_gameboy_t *gb, uint16_t addr)
case GB_MODEL_AGB:
return (addr & 0xF0) | ((addr >> 4) & 0xF);
/*
case GB_MODEL_CGB_D:
if (addr > 0xfec0) {
addr |= 0xf0;
}
return gb->extra_oam[addr - 0xfea0];
*/
case GB_MODEL_CGB_C:
/*
@ -1005,14 +1003,12 @@ static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
gb->oam[addr & 0xFF] = value;
}
switch (gb->model) {
/*
case GB_MODEL_CGB_D:
if (addr > 0xfec0) {
addr |= 0xf0;
}
gb->extra_oam[addr - 0xfea0] = value;
break;
*/
case GB_MODEL_CGB_C:
/*
case GB_MODEL_CGB_B:

1
Core/save_state.c
View File

@ -596,6 +596,7 @@ static int save_state_internal(GB_gameboy_t *gb, virtual_file_t *file, bool appe
case GB_MODEL_CGB_C: bess_core.full_model = BE32('CCC '); break;
case GB_MODEL_CGB_D: bess_core.full_model = BE32('CCD '); break;
case GB_MODEL_CGB_E: bess_core.full_model = BE32('CCE '); break;
case GB_MODEL_AGB: bess_core.full_model = BE32('CA '); break; // SameBoy doesn't emulate a specific AGB revision yet
}