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Removed some dead code from display.c

This commit is contained in:
Lior Halphon 2018-02-20 21:23:27 +02:00
parent 9802ca41dd
commit 56eac9f875
1 changed files with 8 additions and 29 deletions
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37
Core/display.c
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@ -390,13 +390,8 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
gb->display_cycles = 0; gb->display_cycles = 0;
gb->io_registers[GB_IO_STAT] &= ~3; gb->io_registers[GB_IO_STAT] &= ~3;
if (gb->is_cgb) { if (gb->is_cgb) {
if (stat_delay) {
gb->io_registers[GB_IO_STAT] |= 1; gb->io_registers[GB_IO_STAT] |= 1;
} }
else {
gb->io_registers[GB_IO_STAT] |= 2;
}
}
ly_for_comparison = gb->io_registers[GB_IO_LY] = 0; ly_for_comparison = gb->io_registers[GB_IO_LY] = 0;
/* Todo: verify timing */ /* Todo: verify timing */
@ -502,20 +497,20 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
/* Handle everything else */ /* Handle everything else */
/* OAM interrupt happens slightly before STAT is actually updated. (About 1-3 T-cycles) /* OAM interrupt happens slightly before STAT is actually updated. (About 1-3 T-cycles)
Todo: Test double speed CGB */ Todo: Test double speed CGB */
if (position_in_line == 0 && stat_delay) { if (position_in_line == 0) {
if (gb->io_registers[GB_IO_STAT] & 0x20) { if (gb->io_registers[GB_IO_STAT] & 0x20) {
gb->stat_interrupt_line = true; gb->stat_interrupt_line = true;
dmg_future_stat = true; dmg_future_stat = true;
} }
} if (gb->display_cycles != 0) {
if (position_in_line == stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 2;
}
else if (position_in_line == 0 && gb->display_cycles != 0) {
should_compare_ly = gb->is_cgb; should_compare_ly = gb->is_cgb;
ly_for_comparison--; ly_for_comparison--;
} }
}
else if (position_in_line == stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 2;
}
else if (position_in_line == MODE2_LENGTH + stat_delay) { else if (position_in_line == MODE2_LENGTH + stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3; gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 3; gb->io_registers[GB_IO_STAT] |= 3;
@ -609,7 +604,7 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
/* Lines 144 - 152 */ /* Lines 144 - 152 */
else { else {
if (stat_delay && gb->display_cycles % LINE_LENGTH == 0) { if (gb->display_cycles % LINE_LENGTH == 0) {
should_compare_ly = gb->is_cgb; should_compare_ly = gb->is_cgb;
ly_for_comparison--; ly_for_comparison--;
} }
@ -662,22 +657,6 @@ static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
} }
} }
}; };
#if 0
/* The value of LY is glitched in the last cycle of every line in CGB mode CGB in single speed
This is based on AntonioND's docs, however I could not reproduce these findings on my CGB.
Todo: Find out why my tests contradict these docs */
if (gb->cgb_mode && !gb->cgb_double_speed &&
gb->display_cycles % LINE_LENGTH == LINE_LENGTH - 8) {
uint8_t glitch_pattern[] = {0, 0, 2, 0, 4, 4, 6, 0, 8};
if ((gb->io_registers[GB_IO_LY] & 0xF) == 0xF) {
gb->io_registers[GB_IO_LY] = glitch_pattern[gb->io_registers[GB_IO_LY] >> 4] << 4;
}
else {
gb->io_registers[GB_IO_LY] = glitch_pattern[gb->io_registers[GB_IO_LY] & 7] | (gb->io_registers[GB_IO_LY] & 0xF8);
}
}
#endif
} }
void GB_display_run(GB_gameboy_t *gb, uint8_t cycles) void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)