mirror of https://github.com/bsnes-emu/bsnes.git
Clean up OAM bug code
This commit is contained in:
Lior Halphon
parent
d667d87bbe
commit
84aa06aba5
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@ -34,6 +34,17 @@ static uint8_t cycle_read(GB_gameboy_t *gb, uint16_t addr)
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return ret;
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}
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static uint8_t cycle_read_inc_oam_bug(GB_gameboy_t *gb, uint16_t addr)
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{
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if (gb->pending_cycles) {
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GB_advance_cycles(gb, gb->pending_cycles);
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}
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GB_trigger_oam_bug_read_increase(gb, addr); /* Todo: test T-cycle timing */
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uint8_t ret = GB_read_memory(gb, addr);
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gb->pending_cycles = 4;
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return ret;
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}
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static void cycle_write(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
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{
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assert(gb->pending_cycles);
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@ -48,6 +59,21 @@ static void cycle_no_access(GB_gameboy_t *gb)
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gb->pending_cycles += 4;
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}
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static void cycle_oam_bug(GB_gameboy_t *gb, uint8_t register_id)
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{
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if (gb->is_cgb) {
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/* Slight optimization */
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gb->pending_cycles += 4;
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return;
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}
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if (gb->pending_cycles) {
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GB_advance_cycles(gb, gb->pending_cycles);
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}
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GB_trigger_oam_bug(gb, gb->registers[register_id]); /* Todo: test T-cycle timing */
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gb->pending_cycles = 4;
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}
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static void flush_pending_cycles(GB_gameboy_t *gb)
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{
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if (gb->pending_cycles) {
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@ -118,9 +144,7 @@ static void ld_drr_a(GB_gameboy_t *gb, uint8_t opcode)
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static void inc_rr(GB_gameboy_t *gb, uint8_t opcode)
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{
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uint8_t register_id = (opcode >> 4) + 1;
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flush_pending_cycles(gb);
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GB_trigger_oam_bug(gb, gb->registers[register_id]); /* Todo: test T-cycle timing */
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cycle_no_access(gb);
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cycle_oam_bug(gb, register_id);
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gb->registers[register_id]++;
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}
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@ -230,9 +254,7 @@ static void ld_a_drr(GB_gameboy_t *gb, uint8_t opcode)
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static void dec_rr(GB_gameboy_t *gb, uint8_t opcode)
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{
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uint8_t register_id = (opcode >> 4) + 1;
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flush_pending_cycles(gb);
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GB_trigger_oam_bug(gb, gb->registers[register_id]); /* Todo: test T-cycle timing */
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cycle_no_access(gb);
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cycle_oam_bug(gb, register_id);
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gb->registers[register_id]--;
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}
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@ -424,18 +446,14 @@ static void ld_dhld_a(GB_gameboy_t *gb, uint8_t opcode)
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static void ld_a_dhli(GB_gameboy_t *gb, uint8_t opcode)
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{
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flush_pending_cycles(gb);
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GB_trigger_oam_bug_read_increase(gb, gb->registers[GB_REGISTER_HL]); /* Todo: test T-cycle timing */
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gb->registers[GB_REGISTER_AF] &= 0xFF;
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gb->registers[GB_REGISTER_AF] |= cycle_read(gb, gb->registers[GB_REGISTER_HL]++) << 8;
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gb->registers[GB_REGISTER_AF] |= cycle_read_inc_oam_bug(gb, gb->registers[GB_REGISTER_HL]++) << 8;
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}
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static void ld_a_dhld(GB_gameboy_t *gb, uint8_t opcode)
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{
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flush_pending_cycles(gb);
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GB_trigger_oam_bug_read_increase(gb, gb->registers[GB_REGISTER_HL]); /* Todo: test T-cycle timing */
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gb->registers[GB_REGISTER_AF] &= 0xFF;
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gb->registers[GB_REGISTER_AF] |= cycle_read(gb, gb->registers[GB_REGISTER_HL]--) << 8;
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gb->registers[GB_REGISTER_AF] |= cycle_read_inc_oam_bug(gb, gb->registers[GB_REGISTER_HL]--) << 8;
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}
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static void inc_dhl(GB_gameboy_t *gb, uint8_t opcode)
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@ -693,9 +711,7 @@ static void pop_rr(GB_gameboy_t *gb, uint8_t opcode)
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{
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uint8_t register_id;
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register_id = ((opcode >> 4) + 1) & 3;
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flush_pending_cycles(gb);
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GB_trigger_oam_bug_read_increase(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
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gb->registers[register_id] = cycle_read(gb, gb->registers[GB_REGISTER_SP]++);
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gb->registers[register_id] = cycle_read_inc_oam_bug(gb, gb->registers[GB_REGISTER_SP]++);
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gb->registers[register_id] |= cycle_read(gb, gb->registers[GB_REGISTER_SP]++) << 8;
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gb->registers[GB_REGISTER_AF] &= 0xFFF0; // Make sure we don't set impossible flags on F! See Blargg's PUSH AF test.
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}
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@ -731,9 +747,7 @@ static void call_cc_a16(GB_gameboy_t *gb, uint8_t opcode)
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if (condition_code(gb, opcode)) {
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uint16_t addr = cycle_read(gb, gb->pc++);
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addr |= (cycle_read(gb, gb->pc++) << 8);
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flush_pending_cycles(gb);
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GB_trigger_oam_bug(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
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cycle_no_access(gb);
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cycle_oam_bug(gb, GB_REGISTER_SP);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->pc) >> 8);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->pc) & 0xFF);
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gb->pc = addr;
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@ -750,9 +764,7 @@ static void call_cc_a16(GB_gameboy_t *gb, uint8_t opcode)
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static void push_rr(GB_gameboy_t *gb, uint8_t opcode)
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{
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uint8_t register_id;
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flush_pending_cycles(gb);
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GB_trigger_oam_bug(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
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cycle_no_access(gb);
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cycle_oam_bug(gb, GB_REGISTER_SP);
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register_id = ((opcode >> 4) + 1) & 3;
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->registers[register_id]) >> 8);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->registers[register_id]) & 0xFF);
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@ -884,9 +896,7 @@ static void cp_a_d8(GB_gameboy_t *gb, uint8_t opcode)
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static void rst(GB_gameboy_t *gb, uint8_t opcode)
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{
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uint16_t call_addr = gb->pc - 1;
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flush_pending_cycles(gb);
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GB_trigger_oam_bug(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
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cycle_no_access(gb);
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cycle_oam_bug(gb, GB_REGISTER_SP);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->pc) >> 8);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->pc) & 0xFF);
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gb->pc = opcode ^ 0xC7;
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@ -896,9 +906,7 @@ static void rst(GB_gameboy_t *gb, uint8_t opcode)
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static void ret(GB_gameboy_t *gb, uint8_t opcode)
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{
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GB_debugger_ret_hook(gb);
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flush_pending_cycles(gb);
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GB_trigger_oam_bug_read_increase(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
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gb->pc = cycle_read(gb, gb->registers[GB_REGISTER_SP]++);
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gb->pc = cycle_read_inc_oam_bug(gb, gb->registers[GB_REGISTER_SP]++);
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gb->pc |= cycle_read(gb, gb->registers[GB_REGISTER_SP]++) << 8;
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cycle_no_access(gb);
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}
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@ -925,9 +933,7 @@ static void call_a16(GB_gameboy_t *gb, uint8_t opcode)
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uint16_t call_addr = gb->pc - 1;
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uint16_t addr = cycle_read(gb, gb->pc++);
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addr |= (cycle_read(gb, gb->pc++) << 8);
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flush_pending_cycles(gb);
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GB_trigger_oam_bug(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
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cycle_no_access(gb);
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cycle_oam_bug(gb, GB_REGISTER_SP);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->pc) >> 8);
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cycle_write(gb, --gb->registers[GB_REGISTER_SP], (gb->pc) & 0xFF);
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gb->pc = addr;
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