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GBHawk: some display bug fixes

This commit is contained in:
alyosha-tas 2020-11-22 17:03:24 -05:00
parent 8199e67770
commit 4a76cc322e
4 changed files with 20 additions and 5 deletions
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7
src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_GB_PPU.cs
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@ -146,7 +146,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// note that their is no stat interrupt bug in GBC
STAT = (byte)((value & 0xF8) | (STAT & 7) | 0x80);
if (((STAT & 3) == 0) && STAT.Bit(3)) { HBL_INT = true; } else { HBL_INT = false; }
if (((STAT & 3) == 0) && STAT.Bit(3) && !glitch_state) { HBL_INT = true; } else { HBL_INT = false; }
if (((STAT & 3) == 1) && STAT.Bit(4)) { VBL_INT = true; } else { VBL_INT = false; }
// OAM not triggered?
// if (((STAT & 3) == 2) && STAT.Bit(5)) { OAM_INT = true; } else { OAM_INT = false; }
@ -515,6 +515,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// we exit vblank into mode 0 for 4 cycles
// but no hblank interrupt, presumably this only happens transitioning from mode 3 to 0
STAT &= 0xFC;
glitch_state = true;
LY_inc = 1;
// also the LCD doesn't turn on right away
// also, the LCD does not enter mode 2 on scanline 0 when first turned on
@ -606,6 +608,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
STAT &= 0xFC;
STAT |= 0x03;
OAM_INT = false;
glitch_state = false;
OAM_access_read = false;
OAM_access_write = false;
@ -1854,6 +1857,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
for (int i = 0; i < OBJ_bytes.Length; i++) { OBJ_bytes[i] = 0xFF; }
pal_change_blocked = false;
glitch_state = false;
}
}
}

10
src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
View File

@ -144,7 +144,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// note that their is no stat interrupt bug in GBC
STAT = (byte)((value & 0xF8) | (STAT & 7) | 0x80);
if (((STAT & 3) == 0) && STAT.Bit(3)) { HBL_INT = true; } else { HBL_INT = false; }
if (((STAT & 3) == 0) && STAT.Bit(3) && !glitch_state) { HBL_INT = true; } else { HBL_INT = false; }
if (((STAT & 3) == 1) && STAT.Bit(4)) { VBL_INT = true; } else { VBL_INT = false; }
// OAM not triggered?
// if (((STAT & 3) == 2) && STAT.Bit(5)) { OAM_INT = true; } else { OAM_INT = false; }
@ -510,6 +510,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// we exit vblank into mode 0 for 4 cycles
// but no hblank interrupt, presumably this only happens transitioning from mode 3 to 0
STAT &= 0xFC;
glitch_state = true;
LY_inc = 1;
// also the LCD doesn't turn on right away
// also, the LCD does not enter mode 2 on scanline 0 when first turned on
@ -604,6 +606,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
STAT &= 0xFC;
STAT |= 0x03;
OAM_INT = false;
glitch_state = false;
OAM_access_read = false;
OAM_access_write = false;
@ -1291,7 +1294,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
STAT &= 0xFC;
STAT |= 0x00;
if (STAT.Bit(3)) { HBL_INT = true; }
// the CPU has to be able to see the transition from mode 3 to mode 0 to start HDMA
// TODO: If Window is turned on midscanline what happens? When is this check done exactly?
@ -1792,7 +1794,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
for (int i = 0; i < BG_bytes.Length; i++) { BG_bytes[i] = 0xFF; }
for (int i = 0; i < OBJ_bytes.Length; i++) { OBJ_bytes[i] = 0xFF; }
LYC_offset = 1;
LYC_offset = 2;
glitch_state = false;
}
}
}

6
src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GB_PPU.cs
View File

@ -197,9 +197,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// we exit vblank into mode 0 for 4 cycles
// but no hblank interrupt, presumably this only happens transitioning from mode 3 to 0
STAT &= 0xFC;
glitch_state = true;
LY_inc = 1;
// also the LCD doesn't turn on right away
// also, the LCD does not enter mode 2 on scanline 0 when first turned on
no_scan = true;
cycle = 8;
@ -289,6 +290,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
STAT &= 0xFC;
STAT |= 0x03;
OAM_INT = false;
glitch_state = false;
OAM_access_read = false;
OAM_access_write = false;
@ -1268,6 +1270,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
window_y_tile = 0;
window_x_tile = 0;
window_y_tile_inc = 0;
glitch_state = false;
}
}
}

2
src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/PPU.cs
View File

@ -116,6 +116,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
public int read_case_prev;
public bool pal_change_blocked; // in compatability mode, you can change palette values but not displayed color
public int LYC_offset; // in double speed mode it appears timing changes for LYC int
public bool glitch_state; // writing to STAT to enable HBL interrupt won't trigger it if the ppu just turned on
// variables not in state
public int total_counter;
@ -282,6 +283,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
ser.Sync(nameof(read_case_prev), ref read_case_prev);
ser.Sync(nameof(pal_change_blocked), ref pal_change_blocked);
ser.Sync(nameof(LYC_offset), ref LYC_offset);
ser.Sync(nameof(glitch_state), ref glitch_state);
}
}
}