diff options
Diffstat (limited to 'source/ppu.cpp')
| -rw-r--r-- | source/ppu.cpp | 226 |
1 files changed, 193 insertions, 33 deletions
diff --git a/source/ppu.cpp b/source/ppu.cpp index 389bdd2..8ba7a5f 100644 --- a/source/ppu.cpp +++ b/source/ppu.cpp @@ -1071,10 +1071,17 @@ void S9xSetPPU (uint8 Byte, uint16 Address) /******************************************************************************/ uint8 S9xGetPPU (uint16 Address) { +#ifndef NO_OPEN_BUS uint8 byte = OpenBus; - +#else + uint8 byte = 0; // Arbitrarily chosen value [Neb] +#endif if(Address<0x2100)//not a real PPU reg +#ifndef NO_OPEN_BUS return OpenBus; //treat as unmapped memory returning last byte on the bus +#else + return 0; // Arbitrarily chosen value [Neb] +#endif if (Address <= 0x2190) { switch (Address) @@ -1086,18 +1093,34 @@ uint8 S9xGetPPU (uint16 Address) #ifdef DEBUGGER missing.oam_address_read = 1; #endif - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2104: case 0x2105: case 0x2106: +#ifndef NO_OPEN_BUS return PPU.OpenBus1; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2107: +#ifndef NO_OPEN_BUS return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2108: case 0x2109: case 0x210a: +#ifndef NO_OPEN_BUS return PPU.OpenBus1; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x210b: case 0x210c: case 0x210d: @@ -1107,8 +1130,14 @@ uint8 S9xGetPPU (uint16 Address) case 0x2111: case 0x2112: case 0x2113: - missing.bg_offset_read = 1; - return OpenBus; +#ifdef DEBUGGER + missing.bg_offset_read = 1; +#endif +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2114: #ifdef DEBUGGER @@ -1116,15 +1145,27 @@ uint8 S9xGetPPU (uint16 Address) #endif case 0x2115: case 0x2116: - return PPU.OpenBus1; +#ifndef NO_OPEN_BUS + return PPU.OpenBus1; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2117: - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2118: case 0x2119: case 0x211a: - return PPU.OpenBus1; +#ifndef NO_OPEN_BUS + return PPU.OpenBus1; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x211b: case 0x211c: @@ -1135,25 +1176,45 @@ uint8 S9xGetPPU (uint16 Address) #ifdef DEBUGGER missing.matrix_read = 1; #endif - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2121: case 0x2122: case 0x2123: - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2124: case 0x2125: case 0x2126: - return PPU.OpenBus1; +#ifndef NO_OPEN_BUS + return PPU.OpenBus1; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2127: - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2128: case 0x2129: case 0x212a: - return PPU.OpenBus1; +#ifndef NO_OPEN_BUS + return PPU.OpenBus1; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x212b: case 0x212c: @@ -1164,7 +1225,11 @@ uint8 S9xGetPPU (uint16 Address) case 0x2131: case 0x2132: case 0x2133: - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2134: case 0x2135: @@ -1182,10 +1247,18 @@ uint8 S9xGetPPU (uint16 Address) #ifdef DEBUGGER missing.matrix_multiply = 1; #endif - return (PPU.OpenBus1 = Memory.FillRAM[Address]); + return ( +#ifndef NO_OPEN_BUS + PPU.OpenBus1 = +#endif + Memory.FillRAM[Address]); case 0x2137: S9xLatchCounters(0); +#ifndef NO_OPEN_BUS return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2138: // Read OAM (sprite) control data @@ -1230,7 +1303,11 @@ uint8 S9xGetPPU (uint16 Address) #ifdef DEBUGGER missing.oam_read = 1; #endif - return (PPU.OpenBus1 = byte); + return ( +#ifndef NO_OPEN_BUS + PPU.OpenBus1 = +#endif + byte); case 0x2139: // Read vram low byte @@ -1275,7 +1352,9 @@ uint8 S9xGetPPU (uint16 Address) IPPU.FirstVRAMRead = FALSE; } #endif +#ifndef NO_OPEN_BUS PPU.OpenBus1 = byte; +#endif break; case 0x213A: // Read vram high byte @@ -1319,7 +1398,9 @@ uint8 S9xGetPPU (uint16 Address) IPPU.FirstVRAMRead = FALSE; } #endif +#ifndef NO_OPEN_BUS PPU.OpenBus1 = byte; +#endif break; case 0x213B: @@ -1333,7 +1414,11 @@ uint8 S9xGetPPU (uint16 Address) byte = PPU.CGDATA [PPU.CGADD] & 0xff; PPU.CGFLIPRead ^= 1; - return (PPU.OpenBus2 = byte); + return ( +#ifndef NO_OPEN_BUS + PPU.OpenBus2 = +#endif + byte); case 0x213C: // Horizontal counter value 0-339 @@ -1341,10 +1426,19 @@ uint8 S9xGetPPU (uint16 Address) missing.h_counter_read = 1; #endif if (PPU.HBeamFlip) - byte = (PPU.OpenBus2 & 0xfe) | ((PPU.HBeamPosLatched >> 8) & 0x01); + byte = +#ifndef NO_OPEN_BUS + (PPU.OpenBus2 & 0xfe) +#else + 0 // Arbitrarily chosen value [Neb] +#endif + | ((PPU.HBeamPosLatched >> 8) & 0x01); + else byte = (uint8)PPU.HBeamPosLatched; +#ifndef NO_OPEN_BUS PPU.OpenBus2 = byte; +#endif PPU.HBeamFlip ^= 1; break; @@ -1354,10 +1448,18 @@ uint8 S9xGetPPU (uint16 Address) missing.v_counter_read = 1; #endif if (PPU.VBeamFlip) - byte = (PPU.OpenBus2 & 0xfe) | ((PPU.VBeamPosLatched >> 8) & 0x01); + byte = +#ifndef NO_OPEN_BUS + (PPU.OpenBus2 & 0xfe) +#else + 0 // Arbitrarily chosen value [Neb] +#endif + | ((PPU.VBeamPosLatched >> 8) & 0x01); else byte = (uint8)PPU.VBeamPosLatched; +#ifndef NO_OPEN_BUS PPU.OpenBus2 = byte; +#endif PPU.VBeamFlip ^= 1; break; @@ -1366,14 +1468,22 @@ uint8 S9xGetPPU (uint16 Address) FLUSH_REDRAW (); //so far, 5c77 version is always 1. - return (PPU.OpenBus1 = (Model->_5C77 | PPU.RangeTimeOver)); + return ( +#ifndef NO_OPEN_BUS + PPU.OpenBus1 = +#endif + (Model->_5C77 | PPU.RangeTimeOver)); case 0x213F: // NTSC/PAL and which field flags PPU.VBeamFlip = PPU.HBeamFlip = 0; //neviksti found a 2 and a 3 here. SNEeSe uses a 3. //XXX: field flags not emulated - return ((Settings.PAL ? 0x10 : 0) | (Memory.FillRAM[0x213f] & 0xc0)| Model->_5C78) | (~PPU.OpenBus2 & 0x20); + return ((Settings.PAL ? 0x10 : 0) | (Memory.FillRAM[0x213f] & 0xc0)| Model->_5C78) +#ifndef NO_OPEN_BUS + | (~PPU.OpenBus2 & 0x20) +#endif + ; case 0x2140: case 0x2141: case 0x2142: case 0x2143: case 0x2144: case 0x2145: case 0x2146: case 0x2147: @@ -1403,7 +1513,7 @@ uint8 S9xGetPPU (uint16 Address) { #ifdef CPU_SHUTDOWN // CPU.WaitAddress = CPU.PCAtOpcodeStart; -#endif +#endif if (SNESGameFixes.APU_OutPorts_ReturnValueFix && Address >= 0x2140 && Address <= 0x2143 && !CPU.V_Counter) { @@ -1457,10 +1567,18 @@ uint8 S9xGetPPU (uint16 Address) case 0x2181: case 0x2182: case 0x2183: - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif - default: - return OpenBus; + default: +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif } } else @@ -1474,15 +1592,23 @@ uint8 S9xGetPPU (uint16 Address) { case 0x21c2: if(Model->_5C77 ==2) - return (0x20); + return (0x20); // fprintf(stderr, "Read from $21c2!\n"); - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x21c3: - if(Model->_5C77 ==2) + if(Model->_5C77 ==2) return (0); // fprintf(stderr, "Read from $21c3!\n"); - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x2800: // For Dai Kaijyu Monogatari II if (Settings.SRTC) @@ -1498,12 +1624,20 @@ uint8 S9xGetPPU (uint16 Address) S9xMessage (S9X_TRACE, S9X_PPU_TRACE, String); } #endif - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif } } if (!Settings.SuperFX) - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif #ifdef ZSNES_FX if (Address < 0x3040) byte = S9xSuperFXReadReg (Address); @@ -2165,7 +2299,11 @@ uint8 S9xGetCPU (uint16 Address) S9xMessage (S9X_TRACE, S9X_PPU_TRACE, String); } #endif - return OpenBus; +#ifndef NO_OPEN_BUS + return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif } // return (Memory.FillRAM [Address]); @@ -2189,7 +2327,11 @@ uint8 S9xGetCPU (uint16 Address) case 0x420d: case 0x420e: case 0x420f: +#ifndef NO_OPEN_BUS return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif case 0x4210: #ifdef CPU_SHUTDOWN @@ -2198,7 +2340,11 @@ uint8 S9xGetCPU (uint16 Address) byte = Memory.FillRAM[0x4210]; Memory.FillRAM[0x4210] = Model->_5A22; //SNEeSe returns 2 for 5A22 version. - return ((byte&0x80)|(OpenBus&0x70)|Model->_5A22); + return ((byte&0x80) +#ifndef NO_OPEN_BUS + |(OpenBus&0x70) +#endif + |Model->_5A22); case 0x4211: byte = (CPU.IRQActive & (PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE)) ? 0x80 : 0; @@ -2207,7 +2353,9 @@ uint8 S9xGetCPU (uint16 Address) CLEAR_IRQ_SOURCE (PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE); // Maybe? Register Scan indicated open bus... +#ifndef NO_OPEN_BUS byte |= OpenBus&0x3f; +#endif return (byte); @@ -2216,7 +2364,11 @@ uint8 S9xGetCPU (uint16 Address) #ifdef CPU_SHUTDOWN CPU.WaitAddress = CPU.PCAtOpcodeStart; #endif - return (REGISTER_4212()|(OpenBus&0x3E)); + return (REGISTER_4212() +#ifndef NO_OPEN_BUS + |(OpenBus&0x3E) +#endif + ); case 0x4213: // I/O port input - returns 0 wherever $4201 is 0, and 1 elsewhere @@ -2401,7 +2553,11 @@ uint8 S9xGetCPU (uint16 Address) return Memory.FillRAM[Address]; } +#ifndef NO_OPEN_BUS return OpenBus; +#else + return 0; // Arbitrarily chosen value [Neb] +#endif } // return (Memory.FillRAM[Address]); } @@ -2469,8 +2625,10 @@ void S9xResetPPU () PPU.OAMPriorityRotation = 0; PPU.OAMWriteRegister = 0; PPU.RangeTimeOver = 0; +#ifndef NO_OPEN_BUS PPU.OpenBus1 = 0; PPU.OpenBus2 = 0; +#endif PPU.OAMFlip = 0; PPU.OAMTileAddress = 0; @@ -2665,8 +2823,10 @@ void S9xSoftResetPPU () PPU.OAMPriorityRotation = 0; PPU.OAMWriteRegister = 0; PPU.RangeTimeOver = 0; +#ifndef NO_OPEN_BUS PPU.OpenBus1 = 0; PPU.OpenBus2 = 0; +#endif PPU.OAMFlip = 0; PPU.OAMTileAddress = 0; |