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snes9xgx/source/snes9x/ppu.h
bladeoner e918ab8a25 Use a license stub everywhere. 
This points to the full license in the root directory.
2018-12-03 12:26:02 +01:00

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/*****************************************************************************\
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
This file is licensed under the Snes9x License.
For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/
#ifndef _PPU_H_
#define _PPU_H_
#define FIRST_VISIBLE_LINE 1
#define TILE_2BIT 0
#define TILE_4BIT 1
#define TILE_8BIT 2
#define TILE_2BIT_EVEN 3
#define TILE_2BIT_ODD 4
#define TILE_4BIT_EVEN 5
#define TILE_4BIT_ODD 6
#define MAX_2BIT_TILES 4096
#define MAX_4BIT_TILES 2048
#define MAX_8BIT_TILES 1024
#define CLIP_OR 0
#define CLIP_AND 1
#define CLIP_XOR 2
#define CLIP_XNOR 3
struct ClipData
{
uint8 Count;
uint8 DrawMode[6];
uint16 Left[6];
uint16 Right[6];
};
struct InternalPPU
{
struct ClipData Clip[2][6];
bool8 ColorsChanged;
bool8 OBJChanged;
uint8 *TileCache[7];
uint8 *TileCached[7];
bool8 Interlace;
bool8 InterlaceOBJ;
bool8 PseudoHires;
bool8 DoubleWidthPixels;
bool8 DoubleHeightPixels;
int CurrentLine;
int PreviousLine;
uint8 *XB;
uint32 Red[256];
uint32 Green[256];
uint32 Blue[256];
uint16 ScreenColors[256];
uint8 MaxBrightness;
bool8 RenderThisFrame;
int RenderedScreenWidth;
int RenderedScreenHeight;
uint32 FrameCount;
uint32 RenderedFramesCount;
uint32 DisplayedRenderedFrameCount;
uint32 TotalEmulatedFrames;
uint32 SkippedFrames;
uint32 FrameSkip;
};
struct SOBJ
{
int16 HPos;
uint16 VPos;
uint8 HFlip;
uint8 VFlip;
uint16 Name;
uint8 Priority;
uint8 Palette;
uint8 Size;
};
struct SPPU
{
struct
{
bool8 High;
uint8 Increment;
uint16 Address;
uint16 Mask1;
uint16 FullGraphicCount;
uint16 Shift;
} VMA;
uint32 WRAM;
struct
{
uint16 SCBase;
uint16 HOffset;
uint16 VOffset;
uint8 BGSize;
uint16 NameBase;
uint16 SCSize;
} BG[4];
uint8 BGMode;
uint8 BG3Priority;
bool8 CGFLIP;
uint8 CGFLIPRead;
uint8 CGADD;
uint8 CGSavedByte;
uint16 CGDATA[256];
struct SOBJ OBJ[128];
bool8 OBJThroughMain;
bool8 OBJThroughSub;
bool8 OBJAddition;
uint16 OBJNameBase;
uint16 OBJNameSelect;
uint8 OBJSizeSelect;
uint16 OAMAddr;
uint16 SavedOAMAddr;
uint8 OAMPriorityRotation;
uint8 OAMFlip;
uint8 OAMReadFlip;
uint16 OAMTileAddress;
uint16 OAMWriteRegister;
uint8 OAMData[512 + 32];
uint8 FirstSprite;
uint8 LastSprite;
uint8 RangeTimeOver;
bool8 HTimerEnabled;
bool8 VTimerEnabled;
short HTimerPosition;
short VTimerPosition;
uint16 IRQHBeamPos;
uint16 IRQVBeamPos;
uint8 HBeamFlip;
uint8 VBeamFlip;
uint16 HBeamPosLatched;
uint16 VBeamPosLatched;
uint16 GunHLatch;
uint16 GunVLatch;
uint8 HVBeamCounterLatched;
bool8 Mode7HFlip;
bool8 Mode7VFlip;
uint8 Mode7Repeat;
short MatrixA;
short MatrixB;
short MatrixC;
short MatrixD;
short CentreX;
short CentreY;
short M7HOFS;
short M7VOFS;
uint8 Mosaic;
uint8 MosaicStart;
bool8 BGMosaic[4];
uint8 Window1Left;
uint8 Window1Right;
uint8 Window2Left;
uint8 Window2Right;
bool8 RecomputeClipWindows;
uint8 ClipCounts[6];
uint8 ClipWindowOverlapLogic[6];
uint8 ClipWindow1Enable[6];
uint8 ClipWindow2Enable[6];
bool8 ClipWindow1Inside[6];
bool8 ClipWindow2Inside[6];
bool8 ForcedBlanking;
uint8 FixedColourRed;
uint8 FixedColourGreen;
uint8 FixedColourBlue;
uint8 Brightness;
uint16 ScreenHeight;
bool8 Need16x8Mulitply;
uint8 BGnxOFSbyte;
uint8 M7byte;
uint8 HDMA;
uint8 HDMAEnded;
uint8 OpenBus1;
uint8 OpenBus2;
uint16 VRAMReadBuffer;
};
extern uint16 SignExtend[2];
extern struct SPPU PPU;
extern struct InternalPPU IPPU;
void S9xResetPPU (void);
void S9xResetPPUFast (void);
void S9xSoftResetPPU (void);
void S9xSetPPU (uint8, uint16);
uint8 S9xGetPPU (uint16);
void S9xSetCPU (uint8, uint16);
uint8 S9xGetCPU (uint16);
void S9xUpdateIRQPositions (bool initial);
void S9xFixColourBrightness (void);
void S9xDoAutoJoypad (void);
#include "gfx.h"
#include "memmap.h"
typedef struct
{
uint8 _5C77;
uint8 _5C78;
uint8 _5A22;
} SnesModel;
extern SnesModel *Model;
extern SnesModel M1SNES;
extern SnesModel M2SNES;
#define MAX_5C77_VERSION 0x01
#define MAX_5C78_VERSION 0x03
#define MAX_5A22_VERSION 0x02
static inline void FLUSH_REDRAW (void)
{
if (IPPU.PreviousLine != IPPU.CurrentLine)
S9xUpdateScreen();
}
static inline void S9xUpdateVRAMReadBuffer()
{
if (PPU.VMA.FullGraphicCount)
{
uint32 addr = PPU.VMA.Address;
uint32 rem = addr & PPU.VMA.Mask1;
uint32 address = (addr & ~PPU.VMA.Mask1) + (rem >> PPU.VMA.Shift) + ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3);
PPU.VRAMReadBuffer = READ_WORD(Memory.VRAM + ((address << 1) & 0xffff));
}
else
PPU.VRAMReadBuffer = READ_WORD(Memory.VRAM + ((PPU.VMA.Address << 1) & 0xffff));
}
static inline void REGISTER_2104 (uint8 Byte)
{
if (!(PPU.OAMFlip & 1))
{
PPU.OAMWriteRegister &= 0xff00;
PPU.OAMWriteRegister |= Byte;
}
if (PPU.OAMAddr & 0x100)
{
int addr = ((PPU.OAMAddr & 0x10f) << 1) + (PPU.OAMFlip & 1);
if (Byte != PPU.OAMData[addr])
{
FLUSH_REDRAW();
PPU.OAMData[addr] = Byte;
IPPU.OBJChanged = TRUE;
// X position high bit, and sprite size (x4)
struct SOBJ *pObj = &PPU.OBJ[(addr & 0x1f) * 4];
pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 0) & 1];
pObj++->Size = Byte & 2;
pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 2) & 1];
pObj++->Size = Byte & 8;
pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 4) & 1];
pObj++->Size = Byte & 32;
pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 6) & 1];
pObj->Size = Byte & 128;
}
}
else if (PPU.OAMFlip & 1)
{
PPU.OAMWriteRegister &= 0x00ff;
uint8 lowbyte = (uint8) (PPU.OAMWriteRegister);
uint8 highbyte = Byte;
PPU.OAMWriteRegister |= Byte << 8;
int addr = (PPU.OAMAddr << 1);
if (lowbyte != PPU.OAMData[addr] || highbyte != PPU.OAMData[addr + 1])
{
FLUSH_REDRAW();
PPU.OAMData[addr] = lowbyte;
PPU.OAMData[addr + 1] = highbyte;
IPPU.OBJChanged = TRUE;
if (addr & 2)
{
// Tile
PPU.OBJ[addr = PPU.OAMAddr >> 1].Name = PPU.OAMWriteRegister & 0x1ff;
// priority, h and v flip.
PPU.OBJ[addr].Palette = (highbyte >> 1) & 7;
PPU.OBJ[addr].Priority = (highbyte >> 4) & 3;
PPU.OBJ[addr].HFlip = (highbyte >> 6) & 1;
PPU.OBJ[addr].VFlip = (highbyte >> 7) & 1;
}
else
{
// X position (low)
PPU.OBJ[addr = PPU.OAMAddr >> 1].HPos &= 0xff00;
PPU.OBJ[addr].HPos |= lowbyte;
// Sprite Y position
PPU.OBJ[addr].VPos = highbyte;
}
}
}
PPU.OAMFlip ^= 1;
if (!(PPU.OAMFlip & 1))
{
++PPU.OAMAddr;
PPU.OAMAddr &= 0x1ff;
if (PPU.OAMPriorityRotation && PPU.FirstSprite != (PPU.OAMAddr >> 1))
{
PPU.FirstSprite = (PPU.OAMAddr & 0xfe) >> 1;
IPPU.OBJChanged = TRUE;
}
}
else
{
if (PPU.OAMPriorityRotation && (PPU.OAMAddr & 1))
IPPU.OBJChanged = TRUE;
}
}
// This code is correct, however due to Snes9x's inaccurate timings, some games might be broken by this chage. :(
#ifdef DEBUGGER
#define CHECK_INBLANK() \
if (!PPU.ForcedBlanking && CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE) \
{ \
printf("Invalid VRAM acess at (%04d, %04d) blank:%d\n", CPU.Cycles, CPU.V_Counter, PPU.ForcedBlanking); \
if (Settings.BlockInvalidVRAMAccess) \
{ \
PPU.VMA.Address += !PPU.VMA.High ? PPU.VMA.Increment : 0; \
return; \
} \
}
#else
#define CHECK_INBLANK() \
if (Settings.BlockInvalidVRAMAccess && !PPU.ForcedBlanking && CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE) \
{ \
PPU.VMA.Address += !PPU.VMA.High ? PPU.VMA.Increment : 0; \
return; \
}
#endif
static inline void REGISTER_2118 (uint8 Byte)
{
CHECK_INBLANK();
uint32 address;
if (PPU.VMA.FullGraphicCount)
{
uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
address = (((PPU.VMA.Address & ~PPU.VMA.Mask1) + (rem >> PPU.VMA.Shift) + ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) & 0xffff;
Memory.VRAM[address] = Byte;
}
else
Memory.VRAM[address = (PPU.VMA.Address << 1) & 0xffff] = Byte;
IPPU.TileCached[TILE_2BIT][address >> 4] = FALSE;
IPPU.TileCached[TILE_4BIT][address >> 5] = FALSE;
IPPU.TileCached[TILE_8BIT][address >> 6] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
if (!PPU.VMA.High)
{
#ifdef DEBUGGER
if (Settings.TraceVRAM && !CPU.InDMAorHDMA)
printf("VRAM write byte: $%04X (%d, %d)\n", PPU.VMA.Address, Memory.FillRAM[0x2115] & 3, (Memory.FillRAM[0x2115] & 0x0c) >> 2);
#endif
PPU.VMA.Address += PPU.VMA.Increment;
}
}
static inline void REGISTER_2118_tile (uint8 Byte)
{
CHECK_INBLANK();
uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
uint32 address = (((PPU.VMA.Address & ~PPU.VMA.Mask1) + (rem >> PPU.VMA.Shift) + ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) & 0xffff;
Memory.VRAM[address] = Byte;
IPPU.TileCached[TILE_2BIT][address >> 4] = FALSE;
IPPU.TileCached[TILE_4BIT][address >> 5] = FALSE;
IPPU.TileCached[TILE_8BIT][address >> 6] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
if (!PPU.VMA.High)
PPU.VMA.Address += PPU.VMA.Increment;
}
static inline void REGISTER_2118_linear (uint8 Byte)
{
CHECK_INBLANK();
uint32 address;
Memory.VRAM[address = (PPU.VMA.Address << 1) & 0xffff] = Byte;
IPPU.TileCached[TILE_2BIT][address >> 4] = FALSE;
IPPU.TileCached[TILE_4BIT][address >> 5] = FALSE;
IPPU.TileCached[TILE_8BIT][address >> 6] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
if (!PPU.VMA.High)
PPU.VMA.Address += PPU.VMA.Increment;
}
#undef CHECK_INBLANK
#ifdef DEBUGGER
#define CHECK_INBLANK() \
if (!PPU.ForcedBlanking && CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE) \
{ \
printf("Invalid VRAM acess at (%04d, %04d) blank:%d\n", CPU.Cycles, CPU.V_Counter, PPU.ForcedBlanking); \
if (Settings.BlockInvalidVRAMAccess) \
{ \
PPU.VMA.Address += PPU.VMA.High ? PPU.VMA.Increment : 0; \
return; \
} \
}
#else
#define CHECK_INBLANK() \
if (Settings.BlockInvalidVRAMAccess && !PPU.ForcedBlanking && CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE) \
{ \
PPU.VMA.Address += PPU.VMA.High ? PPU.VMA.Increment : 0; \
return; \
}
#endif
static inline void REGISTER_2119 (uint8 Byte)
{
CHECK_INBLANK();
uint32 address;
if (PPU.VMA.FullGraphicCount)
{
uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
address = ((((PPU.VMA.Address & ~PPU.VMA.Mask1) + (rem >> PPU.VMA.Shift) + ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) + 1) & 0xffff;
Memory.VRAM[address] = Byte;
}
else
Memory.VRAM[address = ((PPU.VMA.Address << 1) + 1) & 0xffff] = Byte;
IPPU.TileCached[TILE_2BIT][address >> 4] = FALSE;
IPPU.TileCached[TILE_4BIT][address >> 5] = FALSE;
IPPU.TileCached[TILE_8BIT][address >> 6] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
if (PPU.VMA.High)
{
#ifdef DEBUGGER
if (Settings.TraceVRAM && !CPU.InDMAorHDMA)
printf("VRAM write word: $%04X (%d, %d)\n", PPU.VMA.Address, Memory.FillRAM[0x2115] & 3, (Memory.FillRAM[0x2115] & 0x0c) >> 2);
#endif
PPU.VMA.Address += PPU.VMA.Increment;
}
}
static inline void REGISTER_2119_tile (uint8 Byte)
{
CHECK_INBLANK();
uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
uint32 address = ((((PPU.VMA.Address & ~PPU.VMA.Mask1) + (rem >> PPU.VMA.Shift) + ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) + 1) & 0xffff;
Memory.VRAM[address] = Byte;
IPPU.TileCached[TILE_2BIT][address >> 4] = FALSE;
IPPU.TileCached[TILE_4BIT][address >> 5] = FALSE;
IPPU.TileCached[TILE_8BIT][address >> 6] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
if (PPU.VMA.High)
PPU.VMA.Address += PPU.VMA.Increment;
}
static inline void REGISTER_2119_linear (uint8 Byte)
{
CHECK_INBLANK();
uint32 address;
Memory.VRAM[address = ((PPU.VMA.Address << 1) + 1) & 0xffff] = Byte;
IPPU.TileCached[TILE_2BIT][address >> 4] = FALSE;
IPPU.TileCached[TILE_4BIT][address >> 5] = FALSE;
IPPU.TileCached[TILE_8BIT][address >> 6] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_EVEN][((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [address >> 4] = FALSE;
IPPU.TileCached[TILE_2BIT_ODD] [((address >> 4) - 1) & (MAX_2BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_EVEN][((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [address >> 5] = FALSE;
IPPU.TileCached[TILE_4BIT_ODD] [((address >> 5) - 1) & (MAX_4BIT_TILES - 1)] = FALSE;
if (PPU.VMA.High)
PPU.VMA.Address += PPU.VMA.Increment;
}
static inline void REGISTER_2122 (uint8 Byte)
{
if (PPU.CGFLIP)
{
if ((Byte & 0x7f) != (PPU.CGDATA[PPU.CGADD] >> 8) || PPU.CGSavedByte != (uint8) (PPU.CGDATA[PPU.CGADD] & 0xff))
{
FLUSH_REDRAW();
PPU.CGDATA[PPU.CGADD] = (Byte & 0x7f) << 8 | PPU.CGSavedByte;
IPPU.ColorsChanged = TRUE;
IPPU.Red[PPU.CGADD] = IPPU.XB[PPU.CGSavedByte & 0x1f];
IPPU.Blue[PPU.CGADD] = IPPU.XB[(Byte >> 2) & 0x1f];
IPPU.Green[PPU.CGADD] = IPPU.XB[(PPU.CGDATA[PPU.CGADD] >> 5) & 0x1f];
IPPU.ScreenColors[PPU.CGADD] = (uint16) BUILD_PIXEL(IPPU.Red[PPU.CGADD], IPPU.Green[PPU.CGADD], IPPU.Blue[PPU.CGADD]);
}
PPU.CGADD++;
}
else
{
PPU.CGSavedByte = Byte;
}
PPU.CGFLIP ^= 1;
}
static inline void REGISTER_2180 (uint8 Byte)
{
Memory.RAM[PPU.WRAM++] = Byte;
PPU.WRAM &= 0x1ffff;
}
static inline uint8 REGISTER_4212 (void)
{
uint8 byte = 0;
if ((CPU.V_Counter >= PPU.ScreenHeight + FIRST_VISIBLE_LINE) && (CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE + 3))
byte = 1;
if ((CPU.Cycles < Timings.HBlankEnd) || (CPU.Cycles >= Timings.HBlankStart))
byte |= 0x40;
if (CPU.V_Counter >= PPU.ScreenHeight + FIRST_VISIBLE_LINE)
byte |= 0x80;
return (byte);
}
#endif
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