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gfx_org.cpp
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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson ([email protected]) and
* Jerremy Koot ([email protected])
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar ([email protected]) and
* Gary Henderson.
* Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
* C4 C code (c) Copyright 2001 Gary Henderson ([email protected]).
*
* DOS port code contains the works of other authors. See headers in
* individual files.
*
* Snes9x homepage: http://www.snes9x.com
*
* Permission to use, copy, modify and distribute Snes9x in both binary and
* source form, for non-commercial purposes, is hereby granted without fee,
* providing that this license information and copyright notice appear with
* all copies and any derived work.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event shall the authors be held liable for any damages
* arising from the use of this software.
*
* Snes9x is freeware for PERSONAL USE only. Commercial users should
* seek permission of the copyright holders first. Commercial use includes
* charging money for Snes9x or software derived from Snes9x.
*
* The copyright holders request that bug fixes and improvements to the code
* should be forwarded to them so everyone can benefit from the modifications
* in future versions.
*
* Super NES and Super Nintendo Entertainment System are trademarks of
* Nintendo Co., Limited and its subsidiary companies.
*/
#include "snes9x.h"
#include "memmap.h"
#include "ppu.h"
#include "cpuexec.h"
#include "display.h"
#include "gfx.h"
#include "apu.h"
#include "cheats.h"
#define M7 19
#define M8 19
void ComputeClipWindows ();
extern int os9x_BG0,os9x_BG1,os9x_BG2,os9x_BG3,os9x_OBJ,os9x_easy;
extern void S9xSetupOBJ(void);
extern uint8 BitShifts[8][4];
extern uint8 TileShifts[8][4];
extern uint8 PaletteShifts[8][4];
extern uint8 PaletteMasks[8][4];
extern uint8 Depths[8][4];
extern uint8 BGSizes [2];
extern NormalTileRenderer DrawTilePtr;
extern ClippedTileRenderer DrawClippedTilePtr;
extern NormalTileRenderer DrawHiResTilePtr;
extern ClippedTileRenderer DrawHiResClippedTilePtr;
extern LargePixelRenderer DrawLargePixelPtr;
extern struct SBG BG;
extern struct SLineData LineData[240];
extern struct SLineMatrixData LineMatrixData [240];
extern uint8 Mode7Depths [2];
#define ON_MAIN(N) \
(GFX.r212c & (1 << (N)) && \
!(PPU.BG_Forced & (1 << (N))))
#define SUB_OR_ADD(N) \
(GFX.r2131 & (1 << (N)))
#define ON_SUB(N) \
((GFX.r2130 & 0x30) != 0x30 && \
(GFX.r2130 & 2) && \
(GFX.r212d & (1 << N)) && \
!(PPU.BG_Forced & (1 << (N))))
#define ANYTHING_ON_SUB \
((GFX.r2130 & 0x30) != 0x30 && \
(GFX.r2130 & 2) && \
(GFX.r212d & 0x1f))
#define ADD_OR_SUB_ON_ANYTHING \
(GFX.r2131 & 0x3f)
#define BLACK BUILD_PIXEL(0,0,0)
void orgDrawTileHi16 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTileHi16 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16x2 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16x2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16x2x2 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16x2x2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawLargePixel16 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Pixels,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16Add (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16Add (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16Add1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16Add1_2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16FixedAdd1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16FixedAdd1_2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16Sub (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16Sub (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16Sub1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16Sub1_2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawTile16FixedSub1_2 (uint32 Tile, uint32 Offset, uint32 StartLine,
uint32 LineCount);
void orgDrawClippedTile16FixedSub1_2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Width,
uint32 StartLine, uint32 LineCount);
void orgDrawLargePixel16Add (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Pixels,
uint32 StartLine, uint32 LineCount);
void orgDrawLargePixel16Add1_2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Pixels,
uint32 StartLine, uint32 LineCount);
void orgDrawLargePixel16Sub (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Pixels,
uint32 StartLine, uint32 LineCount);
void orgDrawLargePixel16Sub1_2 (uint32 Tile, uint32 Offset,
uint32 StartPixel, uint32 Pixels,
uint32 StartLine, uint32 LineCount);
/*
char mul2shl[]={
0,
1,1,
2,2,2,2,
3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9
};
*/
inline void orgSelectTileRenderer (bool8 normal)
{
DrawHiResTilePtr= orgDrawTileHi16;
DrawHiResClippedTilePtr = orgDrawClippedTileHi16;
if (normal)
{
DrawTilePtr = orgDrawTile16;
DrawClippedTilePtr = orgDrawClippedTile16;
DrawLargePixelPtr = orgDrawLargePixel16;
}
else
{
if (GFX.r2131 & 0x80)
{
if (GFX.r2131 & 0x40)
{
if (GFX.r2130 & 2)
{
DrawTilePtr = orgDrawTile16Sub1_2;
DrawClippedTilePtr = orgDrawClippedTile16Sub1_2;
}
else
{
// Fixed colour substraction
DrawTilePtr = orgDrawTile16FixedSub1_2;
DrawClippedTilePtr = orgDrawClippedTile16FixedSub1_2;
}
DrawLargePixelPtr = orgDrawLargePixel16Sub1_2;
}
else
{
DrawTilePtr = orgDrawTile16Sub;
DrawClippedTilePtr = orgDrawClippedTile16Sub;
DrawLargePixelPtr = orgDrawLargePixel16Sub;
}
}
else
{
if (GFX.r2131 & 0x40)
{
if (GFX.r2130 & 2)
{
DrawTilePtr = orgDrawTile16Add1_2;
DrawClippedTilePtr = orgDrawClippedTile16Add1_2;
}
else
{
// Fixed colour addition
DrawTilePtr = orgDrawTile16FixedAdd1_2;
DrawClippedTilePtr = orgDrawClippedTile16FixedAdd1_2;
}
DrawLargePixelPtr = orgDrawLargePixel16Add1_2;
}
else
{
DrawTilePtr = orgDrawTile16Add;
DrawClippedTilePtr = orgDrawClippedTile16Add;
DrawLargePixelPtr = orgDrawLargePixel16Add;
}
}
}
}
void orgDrawOBJS (bool8 OnMain = FALSE, uint8 D = 0)
{
uint32 O;
uint32 BaseTile, Tile;
CHECK_SOUND();
BG.BitShift = 4;
BG.TileShift = 5;
BG.TileAddress = PPU.OBJNameBase;
BG.StartPalette = 128;
BG.PaletteShift = 4;
BG.PaletteMask = 7;
BG.Buffer = IPPU.TileCache [TILE_4BIT];
BG.Buffered = IPPU.TileCached [TILE_4BIT];
BG.NameSelect = PPU.OBJNameSelect;
BG.DirectColourMode = FALSE;
DrawTilePtr = orgDrawTile16;
DrawClippedTilePtr = orgDrawClippedTile16;
GFX.Z1 = D + 2;
int I = 0;
for (int S = GFX.OBJList [I++]; S >= 0; S = GFX.OBJList [I++])
{
int VPos = GFX.VPositions [S];
int Size = GFX.Sizes[S];
int TileInc = 1;
int Offset;
if (VPos + Size <= (int) GFX.StartY || VPos > (int) GFX.EndY)
continue;
if (OnMain && SUB_OR_ADD(4))
{
orgSelectTileRenderer (!GFX.Pseudo && PPU.OBJ [S].Palette < 4);
}
BaseTile = PPU.OBJ[S].Name | (PPU.OBJ[S].Palette << 10);
if (PPU.OBJ[S].HFlip)
{
BaseTile += ((Size >> 3) - 1) | H_FLIP;
TileInc = -1;
}
if (PPU.OBJ[S].VFlip)
BaseTile |= V_FLIP;
int clipcount = GFX.pCurrentClip->Count [4];
if (!clipcount)
clipcount = 1;
GFX.Z2 = (PPU.OBJ[S].Priority + 1) * 4 + D;
for (int clip = 0; clip < clipcount; clip++)
{
int Left;
int Right;
if (!GFX.pCurrentClip->Count [4])
{
Left = 0;
Right = 256;
}
else
{
Left = GFX.pCurrentClip->Left [clip][4];
Right = GFX.pCurrentClip->Right [clip][4];
}
if (Right <= Left || PPU.OBJ[S].HPos + Size <= Left ||
PPU.OBJ[S].HPos >= Right)
continue;
for (int Y = 0; Y < Size; Y += 8)
{
if (VPos + Y + 7 >= (int) GFX.StartY && VPos + Y <= (int) GFX.EndY)
{
int StartLine;
int TileLine;
int LineCount;
int Last;
if ((StartLine = VPos + Y) < (int) GFX.StartY)
{
StartLine = GFX.StartY - StartLine;
LineCount = 8 - StartLine;
}
else
{
StartLine = 0;
LineCount = 8;
}
if ((Last = VPos + Y + 7 - GFX.EndY) > 0)
if ((LineCount -= Last) <= 0)
break;
TileLine = StartLine << 3;
O = (VPos + Y + StartLine) * GFX.PPL;
if (!PPU.OBJ[S].VFlip)
Tile = BaseTile + (Y << 1);
else
Tile = BaseTile + ((Size - Y - 8) << 1);
int Middle = Size >> 3;
if (PPU.OBJ[S].HPos < Left)
{
Tile += ((Left - PPU.OBJ[S].HPos) >> 3) * TileInc;
Middle -= (Left - PPU.OBJ[S].HPos) >> 3;
O += Left * 1;
if ((Offset = (Left - PPU.OBJ[S].HPos) & 7))
{
O -= Offset * 1;
int W = 8 - Offset;
int Width = Right - Left;
if (W > Width)
W = Width;
(*DrawClippedTilePtr) (Tile, O, Offset, W,
TileLine, LineCount);
if (W >= Width)
continue;
Tile += TileInc;
Middle--;
O += 8 * 1;
}
}
else
O += PPU.OBJ[S].HPos * 1;
if (PPU.OBJ[S].HPos + Size >= Right)
{
Middle -= ((PPU.OBJ[S].HPos + Size + 7) -
Right) >> 3;
Offset = (Right - (PPU.OBJ[S].HPos + Size)) & 7;
}
else
Offset = 0;
for (int X = 0; X < Middle; X++, O += 8 * 1,
Tile += TileInc)
{
(*DrawTilePtr) (Tile, O, TileLine, LineCount);
}
if (Offset)
{
(*DrawClippedTilePtr) (Tile, O, 0, Offset,
TileLine, LineCount);
}
}
}
}
}
}
void orgDrawBackgroundMosaic (uint32 BGMode, uint32 bg, uint8 Z1, uint8 Z2)
{
CHECK_SOUND();
uint32 Tile;
uint16 *SC0;
uint16 *SC1;
uint16 *SC2;
uint16 *SC3;
uint8 depths [2] = {Z1, Z2};
if (BGMode == 0)
BG.StartPalette = bg << 5;
else
BG.StartPalette = 0;
SC0 = (uint16 *) &VRAM[PPU.BG[bg].SCBase << 1];
if (PPU.BG[bg].SCSize & 1)
SC1 = SC0 + 1024;
else
SC1 = SC0;
if((SC1-(unsigned short*)VRAM)>0x10000)
SC1-=0x10000;
if (PPU.BG[bg].SCSize & 2)
SC2 = SC1 + 1024;
else
SC2 = SC0;
if((SC2-(unsigned short*)VRAM)>0x10000)
SC2-=0x10000;
if (PPU.BG[bg].SCSize & 1)
SC3 = SC2 + 1024;
else
SC3 = SC2;
if((SC3-(unsigned short*)VRAM)>0x10000)
SC3-=0x10000;
uint32 Lines;
uint32 OffsetMask;
uint32 OffsetShift;
if (BG.TileSize == 16)
{
OffsetMask = 0x3ff;
OffsetShift = 4;
}
else
{
OffsetMask = 0x1ff;
OffsetShift = 3;
}
for (uint32 Y = GFX.StartY; Y <= GFX.EndY; Y += Lines)
{
uint32 VOffset = LineData [Y].BG[bg].VOffset;
uint32 HOffset = LineData [Y].BG[bg].HOffset;
uint32 MosaicOffset = Y % PPU.Mosaic;
for (Lines = 1; Lines < PPU.Mosaic - MosaicOffset; Lines++)
if ((VOffset != LineData [Y + Lines].BG[bg].VOffset) ||
(HOffset != LineData [Y + Lines].BG[bg].HOffset))
break;
uint32 MosaicLine = VOffset + Y - MosaicOffset;
if (Y + Lines > GFX.EndY)
Lines = GFX.EndY + 1 - Y;
uint32 VirtAlign = (MosaicLine & 7) << 3;
uint16 *b1;
uint16 *b2;
uint32 ScreenLine = MosaicLine >> OffsetShift;
uint32 Rem16 = MosaicLine & 15;
if (ScreenLine & 0x20)
b1 = SC2, b2 = SC3;
else
b1 = SC0, b2 = SC1;
b1 += (ScreenLine & 0x1f) << 5;
b2 += (ScreenLine & 0x1f) << 5;
uint16 *t;
uint32 Left = 0;
uint32 Right = 256;
uint32 ClipCount = GFX.pCurrentClip->Count [bg];
uint32 HPos = HOffset;
uint32 PixWidth = PPU.Mosaic;
if (!ClipCount)
ClipCount = 1;
for (uint32 clip = 0; clip < ClipCount; clip++)
{
if (GFX.pCurrentClip->Count [bg])
{
Left = GFX.pCurrentClip->Left [clip][bg];
Right = GFX.pCurrentClip->Right [clip][bg];
uint32 r = Left % PPU.Mosaic;
HPos = HOffset + Left;
PixWidth = PPU.Mosaic - r;
}
uint32 s = Y * GFX.PPL + Left * 1;
for (uint32 x = Left; x < Right; x += PixWidth,
s += PixWidth * 1,
HPos += PixWidth, PixWidth = PPU.Mosaic)
{
uint32 Quot = (HPos & OffsetMask) >> 3;
if (x + PixWidth >= Right)
PixWidth = Right - x;
if (BG.TileSize == 8)
{
if (Quot > 31)
t = b2 + (Quot & 0x1f);
else
t = b1 + Quot;
}
else
{
if (Quot > 63)
t = b2 + ((Quot >> 1) & 0x1f);
else
t = b1 + (Quot >> 1);
}
Tile = READ_2BYTES (t);
GFX.Z1 = GFX.Z2 = depths [(Tile & 0x2000) >> 13];
// orgDraw tile...
if (BG.TileSize != 8)
{
if (Tile & H_FLIP)
{
// Horizontal flip, but what about vertical flip ?
if (Tile & V_FLIP)
{
// Both horzontal & vertical flip
if (Rem16 < 8)
{
(*DrawLargePixelPtr) (Tile + 17 - (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
else
{
(*DrawLargePixelPtr) (Tile + 1 - (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
}
else
{
// Horizontal flip only
if (Rem16 > 7)
{
(*DrawLargePixelPtr) (Tile + 17 - (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
else
{
(*DrawLargePixelPtr) (Tile + 1 - (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
}
}
else
{
// No horizontal flip, but is there a vertical flip ?
if (Tile & V_FLIP)
{
// Vertical flip only
if (Rem16 < 8)
{
(*DrawLargePixelPtr) (Tile + 16 + (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
else
{
(*DrawLargePixelPtr) (Tile + (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
}
else
{
// Normal unflipped
if (Rem16 > 7)
{
(*DrawLargePixelPtr) (Tile + 16 + (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
else
{
(*DrawLargePixelPtr) (Tile + (Quot & 1), s,
HPos & 7, PixWidth,
VirtAlign, Lines);
}
}
}
}
else
(*DrawLargePixelPtr) (Tile, s, HPos & 7, PixWidth,
VirtAlign, Lines);
}
}
}
}
void orgDrawBackgroundOffset (uint32 BGMode, uint32 bg, uint8 Z1, uint8 Z2)
{
CHECK_SOUND();
uint32 Tile;
uint16 *SC0;
uint16 *SC1;
uint16 *SC2;
uint16 *SC3;
uint16 *BPS0;
uint16 *BPS1;
uint16 *BPS2;
uint16 *BPS3;
uint32 Width;
int VOffsetOffset = BGMode == 4 ? 0 : 32;
uint8 depths [2] = {Z1, Z2};
BG.StartPalette = 0;
BPS0 = (uint16 *) &VRAM[PPU.BG[2].SCBase << 1];
if (PPU.BG[2].SCSize & 1)
BPS1 = BPS0 + 1024;
else
BPS1 = BPS0;
if (PPU.BG[2].SCSize & 2)
BPS2 = BPS1 + 1024;
else
BPS2 = BPS0;
if (PPU.BG[2].SCSize & 1)
BPS3 = BPS2 + 1024;
else
BPS3 = BPS2;
SC0 = (uint16 *) &VRAM[PPU.BG[bg].SCBase << 1];
if (PPU.BG[bg].SCSize & 1)
SC1 = SC0 + 1024;
else
SC1 = SC0;
if((SC1-(unsigned short*)VRAM)>0x10000)
SC1-=0x10000;
if (PPU.BG[bg].SCSize & 2)
SC2 = SC1 + 1024;
else
SC2 = SC0;
if((SC2-(unsigned short*)VRAM)>0x10000)
SC2-=0x10000;
if (PPU.BG[bg].SCSize & 1)
SC3 = SC2 + 1024;
else
SC3 = SC2;
if((SC3-(unsigned short*)VRAM)>0x10000)
SC3-=0x10000;
static const int Lines = 1;
int OffsetMask;
int OffsetShift;
int OffsetEnableMask = 1 << (bg + 13);
if (BG.TileSize == 16)
{
OffsetMask = 0x3ff;
OffsetShift = 4;
}
else
{
OffsetMask = 0x1ff;
OffsetShift = 3;
}
for (uint32 Y = GFX.StartY; Y <= GFX.EndY; Y++)
{
uint32 VOff = LineData [Y].BG[2].VOffset - 1;
// uint32 VOff = LineData [Y].BG[2].VOffset;
uint32 HOff = LineData [Y].BG[2].HOffset;
int VirtAlign;
int ScreenLine = VOff >> 3;
int t1;
int t2;
uint16 *s0;
uint16 *s1;
uint16 *s2;
if (ScreenLine & 0x20)
s1 = BPS2, s2 = BPS3;
else
s1 = BPS0, s2 = BPS1;
s1 += (ScreenLine & 0x1f) << 5;
s2 += (ScreenLine & 0x1f) << 5;
if(BGMode != 4)
{
if((ScreenLine & 0x1f) == 0x1f)
{
if(ScreenLine & 0x20)
VOffsetOffset = BPS0 - BPS2 - 0x1f*32;
else
VOffsetOffset = BPS2 - BPS0 - 0x1f*32;
}
else
{
VOffsetOffset = 32;
}
}
int clipcount = GFX.pCurrentClip->Count [bg];
if (!clipcount)
clipcount = 1;
for (int clip = 0; clip < clipcount; clip++)
{
uint32 Left;
uint32 Right;
if (!GFX.pCurrentClip->Count [bg])
{
Left = 0;
Right = 256;
}
else
{
Left = GFX.pCurrentClip->Left [clip][bg];
Right = GFX.pCurrentClip->Right [clip][bg];
if (Right <= Left)
continue;
}
uint32 VOffset;
uint32 HOffset;
//added:
uint32 LineHOffset=LineData [Y].BG[bg].HOffset;
uint32 Offset;
uint32 HPos;
uint32 Quot;
uint32 Count;
uint16 *t;
uint32 Quot2;
uint32 VCellOffset;
uint32 HCellOffset;
uint16 *b1;
uint16 *b2;
uint32 TotalCount = 0;
uint32 MaxCount = 8;
uint32 s = Left * 1 + Y * GFX.PPL;
bool8 left_hand_edge = (Left == 0);
Width = Right - Left;
if (Left & 7)
MaxCount = 8 - (Left & 7);
while (Left < Right)
{
if (left_hand_edge)
{
// The SNES offset-per-tile background mode has a
// hardware limitation that the offsets cannot be set
// for the tile at the left-hand edge of the screen.
VOffset = LineData [Y].BG[bg].VOffset;
//MKendora; use temp var to reduce memory accesses
//HOffset = LineData [Y].BG[bg].HOffset;
HOffset = LineHOffset;
//End MK
left_hand_edge = FALSE;
}
else
{
// All subsequent offset tile data is shifted left by one,
// hence the - 1 below.
Quot2 = ((HOff + Left - 1) & OffsetMask) >> 3;
if (Quot2 > 31)
s0 = s2 + (Quot2 & 0x1f);
else
s0 = s1 + Quot2;
HCellOffset = READ_2BYTES (s0);
if (BGMode == 4)
{
VOffset = LineData [Y].BG[bg].VOffset;
//MKendora another mem access hack
//HOffset = LineData [Y].BG[bg].HOffset;
HOffset=LineHOffset;
//end MK
if ((HCellOffset & OffsetEnableMask))
{
if (HCellOffset & 0x8000)
VOffset = HCellOffset + 1;
else
HOffset = HCellOffset;
}
}
else
{
VCellOffset = READ_2BYTES (s0 + VOffsetOffset);
if ((VCellOffset & OffsetEnableMask))
VOffset = VCellOffset + 1;
else
VOffset = LineData [Y].BG[bg].VOffset;
//MKendora Strike Gunner fix
if ((HCellOffset & OffsetEnableMask))
{
//HOffset= HCellOffset;
HOffset = (HCellOffset & ~7)|(LineHOffset&7);
//HOffset |= LineData [Y].BG[bg].HOffset&7;
}
else
HOffset=LineHOffset;
//HOffset = LineData [Y].BG[bg].HOffset -
//Settings.StrikeGunnerOffsetHack;
//HOffset &= (~7);
//end MK
}
}
VirtAlign = ((Y + VOffset) & 7) << 3;
ScreenLine = (VOffset + Y) >> OffsetShift;
if (((VOffset + Y) & 15) > 7)
{
t1 = 16;
t2 = 0;
}
else
{
t1 = 0;
t2 = 16;
}
if (ScreenLine & 0x20)
b1 = SC2, b2 = SC3;
else
b1 = SC0, b2 = SC1;
b1 += (ScreenLine & 0x1f) << 5;
b2 += (ScreenLine & 0x1f) << 5;
HPos = (HOffset + Left) & OffsetMask;
Quot = HPos >> 3;
if (BG.TileSize == 8)
{
if (Quot > 31)
t = b2 + (Quot & 0x1f);
else
t = b1 + Quot;
}
else
{
if (Quot > 63)
t = b2 + ((Quot >> 1) & 0x1f);
else
t = b1 + (Quot >> 1);
}
if (MaxCount + TotalCount > Width)
MaxCount = Width - TotalCount;
Offset = HPos & 7;
//Count =1;
Count = 8 - Offset;
if (Count > MaxCount)
Count = MaxCount;
s -= Offset * 1;
Tile = READ_2BYTES(t);
GFX.Z1 = GFX.Z2 = depths [(Tile & 0x2000) >> 13];
if (BG.TileSize == 8)
(*DrawClippedTilePtr) (Tile, s, Offset, Count, VirtAlign, Lines);
else
{
if (!(Tile & (V_FLIP | H_FLIP)))
{
// Normal, unflipped
(*DrawClippedTilePtr) (Tile + t1 + (Quot & 1),
s, Offset, Count, VirtAlign, Lines);
}
else
if (Tile & H_FLIP)
{
if (Tile & V_FLIP)
{
// H & V flip
(*DrawClippedTilePtr) (Tile + t2 + 1 - (Quot & 1),
s, Offset, Count, VirtAlign, Lines);
}
else
{
// H flip only
(*DrawClippedTilePtr) (Tile + t1 + 1 - (Quot & 1),
s, Offset, Count, VirtAlign, Lines);
}
}
else
{
// V flip only
(*DrawClippedTilePtr) (Tile + t2 + (Quot & 1),
s, Offset, Count, VirtAlign, Lines);
}
}
Left += Count;
TotalCount += Count;
s += (Offset + Count) * 1;
MaxCount = 8;
}
}
}
}
void orgDrawBackgroundMode5 (uint32 /* BGMODE */, uint32 bg, uint8 Z1, uint8
Z2)
{
CHECK_SOUND();
GFX.Pitch = GFX.RealPitch;
GFX.PPL = GFX.PPLx2 >> 1;
uint8 depths [2] = {Z1, Z2};