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gfx.cpp
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gfx.cpp
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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
* Jerremy Koot (jkoot@snes9x.com)
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) 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 (gary.henderson@ntlworld.com).
*
* 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 <stdarg.h>
#include "snes9x.h"
#include "memmap.h"
#include "ppu.h"
#include "cpuexec.h"
#include "gfx.h"
#include "apu.h"
#include "cheats.h"
#include "tile.h"
#include "misc.h"
#define USE_CRAZY_OPTS
#define M7 19
#define M8 19
#define GFX_PIX_SIZE 1
void ComputeClipWindows();
static void S9xDisplayFrameRate();
static void S9xDisplayString(const char *string);
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)
bool8 S9xGraphicsInit ()
{
register uint32 PixelOdd = 1;
register uint32 PixelEven = 2;
#ifdef GFX_MULTI_FORMAT
if (GFX.BuildPixel == NULL)
S9xSetRenderPixelFormat (RGB565);
#endif
for (uint8 bitshift = 0; bitshift < 4; bitshift++)
{
for (register int i = 0; i < 16; i++)
{
register uint32 h = 0;
register uint32 l = 0;
#if defined(LSB_FIRST)
if (i & 8)
h |= PixelOdd;
if (i & 4)
h |= PixelOdd << 8;
if (i & 2)
h |= PixelOdd << 16;
if (i & 1)
h |= PixelOdd << 24;
if (i & 8)
l |= PixelOdd;
if (i & 4)
l |= PixelOdd << 8;
if (i & 2)
l |= PixelOdd << 16;
if (i & 1)
l |= PixelOdd << 24;
#else
if (i & 8)
h |= (PixelOdd << 24);
if (i & 4)
h |= (PixelOdd << 16);
if (i & 2)
h |= (PixelOdd << 8);
if (i & 1)
h |= PixelOdd;
if (i & 8)
l |= (PixelOdd << 24);
if (i & 4)
l |= (PixelOdd << 16);
if (i & 2)
l |= (PixelOdd << 8);
if (i & 1)
l |= PixelOdd;
#endif
odd_high[bitshift][i] = h;
odd_low[bitshift][i] = l;
h = l = 0;
#if defined(LSB_FIRST)
if (i & 8)
h |= PixelEven;
if (i & 4)
h |= PixelEven << 8;
if (i & 2)
h |= PixelEven << 16;
if (i & 1)
h |= PixelEven << 24;
if (i & 8)
l |= PixelEven;
if (i & 4)
l |= PixelEven << 8;
if (i & 2)
l |= PixelEven << 16;
if (i & 1)
l |= PixelEven << 24;
#else
if (i & 8)
h |= (PixelEven << 24);
if (i & 4)
h |= (PixelEven << 16);
if (i & 2)
h |= (PixelEven << 8);
if (i & 1)
h |= PixelEven;
if (i & 8)
l |= (PixelEven << 24);
if (i & 4)
l |= (PixelEven << 16);
if (i & 2)
l |= (PixelEven << 8);
if (i & 1)
l |= PixelEven;
#endif
even_high[bitshift][i] = h;
even_low[bitshift][i] = l;
}
PixelEven <<= 2;
PixelOdd <<= 2;
}
GFX.InfoStringTimeout = 0;
GFX.InfoString = NULL;
PPU.BG_Forced = 0;
IPPU.OBJChanged = TRUE;
IPPU.DirectColourMapsNeedRebuild = TRUE;
DrawTilePtr = DrawTile16;
DrawClippedTilePtr = DrawClippedTile16;
DrawLargePixelPtr = DrawLargePixel16;
DrawHiResTilePtr= DrawHiResTile16;
DrawHiResClippedTilePtr = DrawHiResClippedTile16;
S9xFixColourBrightness();
if (!(GFX.X2 = (uint16 *) malloc (sizeof (uint16) * 0x10000)))
return (FALSE);
if (!(GFX.ZERO_OR_X2 = (uint16 *) malloc (sizeof (uint16) * 0x10000)) ||
!(GFX.ZERO = (uint16 *) malloc (sizeof (uint16) * 0x10000)))
{
if (GFX.ZERO_OR_X2)
{
free ((char *) GFX.ZERO_OR_X2);
GFX.ZERO_OR_X2 = NULL;
}
if (GFX.X2)
{
free ((char *) GFX.X2);
GFX.X2 = NULL;
}
return (FALSE);
}
uint32 r, g, b;
// Build a lookup table that multiplies a packed RGB value by 2 with
// saturation.
for (r = 0; r <= MAX_RED; r++)
{
uint32 r2 = r << 1;
if (r2 > MAX_RED)
r2 = MAX_RED;
for (g = 0; g <= MAX_GREEN; g++)
{
uint32 g2 = g << 1;
if (g2 > MAX_GREEN)
g2 = MAX_GREEN;
for (b = 0; b <= MAX_BLUE; b++)
{
uint32 b2 = b << 1;
if (b2 > MAX_BLUE)
b2 = MAX_BLUE;
GFX.X2 [BUILD_PIXEL2 (r, g, b)] = BUILD_PIXEL2 (r2, g2, b2);
GFX.X2 [BUILD_PIXEL2 (r, g, b) & ~ALPHA_BITS_MASK] = BUILD_PIXEL2 (r2, g2, b2);
}
}
}
ZeroMemory (GFX.ZERO, 0x10000 * sizeof (uint16));
ZeroMemory (GFX.ZERO_OR_X2, 0x10000 * sizeof (uint16));
// Build a lookup table that if the top bit of the color value is zero
// then the value is zero, otherwise multiply the value by 2. Used by
// the color subtraction code.
#if defined(OLD_COLOUR_BLENDING)
for (r = 0; r <= MAX_RED; r++)
{
uint32 r2 = r;
if ((r2 & 0x10) == 0)
r2 = 0;
else
r2 = (r2 << 1) & MAX_RED;
for (g = 0; g <= MAX_GREEN; g++)
{
uint32 g2 = g;
if ((g2 & GREEN_HI_BIT) == 0)
g2 = 0;
else
g2 = (g2 << 1) & MAX_GREEN;
for (b = 0; b <= MAX_BLUE; b++)
{
uint32 b2 = b;
if ((b2 & 0x10) == 0)
b2 = 0;
else
b2 = (b2 << 1) & MAX_BLUE;
GFX.ZERO_OR_X2 [BUILD_PIXEL2 (r, g, b)] = BUILD_PIXEL2 (r2, g2, b2);
GFX.ZERO_OR_X2 [BUILD_PIXEL2 (r, g, b) & ~ALPHA_BITS_MASK] = BUILD_PIXEL2 (r2, g2, b2);
}
}
}
#else
for (r = 0; r <= MAX_RED; r++)
{
uint32 r2 = r;
if ((r2 & 0x10) == 0)
r2 = 0;
else
r2 = (r2 << 1) & MAX_RED;
if (r2 == 0)
r2 = 1;
for (g = 0; g <= MAX_GREEN; g++)
{
uint32 g2 = g;
if ((g2 & GREEN_HI_BIT) == 0)
g2 = 0;
else
g2 = (g2 << 1) & MAX_GREEN;
if (g2 == 0)
g2 = 1;
for (b = 0; b <= MAX_BLUE; b++)
{
uint32 b2 = b;
if ((b2 & 0x10) == 0)
b2 = 0;
else
b2 = (b2 << 1) & MAX_BLUE;
if (b2 == 0)
b2 = 1;
GFX.ZERO_OR_X2 [BUILD_PIXEL2 (r, g, b)] = BUILD_PIXEL2 (r2, g2, b2);
GFX.ZERO_OR_X2 [BUILD_PIXEL2 (r, g, b) & ~ALPHA_BITS_MASK] = BUILD_PIXEL2 (r2, g2, b2);
}
}
}
#endif
// Build a lookup table that if the top bit of the color value is zero
// then the value is zero, otherwise its just the value.
for (r = 0; r <= MAX_RED; r++)
{
uint32 r2 = r;
if ((r2 & 0x10) == 0)
r2 = 0;
else
r2 &= ~0x10;
for (g = 0; g <= MAX_GREEN; g++)
{
uint32 g2 = g;
if ((g2 & GREEN_HI_BIT) == 0)
g2 = 0;
else
g2 &= ~GREEN_HI_BIT;
for (b = 0; b <= MAX_BLUE; b++)
{
uint32 b2 = b;
if ((b2 & 0x10) == 0)
b2 = 0;
else
b2 &= ~0x10;
GFX.ZERO [BUILD_PIXEL2 (r, g, b)] = BUILD_PIXEL2 (r2, g2, b2);
GFX.ZERO [BUILD_PIXEL2 (r, g, b) & ~ALPHA_BITS_MASK] = BUILD_PIXEL2 (r2, g2, b2);
}
}
}
return TRUE;
}
void S9xGraphicsDeinit (void)
{
// Free any memory allocated in S9xGraphicsInit
if (GFX.X2)
{
free ((char *) GFX.X2);
GFX.X2 = NULL;
}
if (GFX.ZERO_OR_X2)
{
free ((char *) GFX.ZERO_OR_X2);
GFX.ZERO_OR_X2 = NULL;
}
if (GFX.ZERO)
{
free ((char *) GFX.ZERO);
GFX.ZERO = NULL;
}
}
void S9xBuildDirectColourMaps ()
{
for (uint32 p = 0; p < 8; p++)
{
for (uint32 c = 0; c < 256; c++)
{
// XXX: Brightness
DirectColourMaps [p][c] = BUILD_PIXEL (((c & 7) << 2) | ((p & 1) << 1),
((c & 0x38) >> 1) | (p & 2),
((c & 0xc0) >> 3) | (p & 4));
}
}
IPPU.DirectColourMapsNeedRebuild = FALSE;
}
void S9xStartScreenRefresh()
{
if (GFX.InfoStringTimeout > 0 && --GFX.InfoStringTimeout == 0) {
free(GFX.InfoString);
GFX.InfoString = NULL;
}
IPPU.FrameCount++;
if (IPPU.RenderThisFrame) {
if (!S9xInitUpdate()) {
IPPU.RenderThisFrame = FALSE;
return;
}
IPPU.PreviousLine = IPPU.CurrentLine = 0;
IPPU.MaxBrightness = PPU.Brightness;
IPPU.LatchedBlanking = PPU.ForcedBlanking;
IPPU.LatchedInterlace = (Memory.FillRAM[0x2133] & 1);
IPPU.RenderedScreenWidth = 256;
IPPU.RenderedScreenHeight = PPU.ScreenHeight;
IPPU.DoubleWidthPixels = FALSE;
PPU.RecomputeClipWindows = TRUE;
}
}
void RenderLine (uint8 C)
{
if (IPPU.RenderThisFrame)
{
LineData[C].BG[0].VOffset = PPU.BG[0].VOffset + 1;
LineData[C].BG[0].HOffset = PPU.BG[0].HOffset;
LineData[C].BG[1].VOffset = PPU.BG[1].VOffset + 1;
LineData[C].BG[1].HOffset = PPU.BG[1].HOffset;
if (PPU.BGMode == 7)
{
struct SLineMatrixData *p = &LineMatrixData [C];
p->MatrixA = PPU.MatrixA;
p->MatrixB = PPU.MatrixB;
p->MatrixC = PPU.MatrixC;
p->MatrixD = PPU.MatrixD;
p->CentreX = PPU.CentreX;
p->CentreY = PPU.CentreY;
}
else
{
#ifndef RC_OPTIMIZED
if (Settings.StarfoxHack && PPU.BG[2].VOffset == 0 &&
PPU.BG[2].HOffset == 0xe000)
{
LineData[C].BG[2].VOffset = 0xe1;
LineData[C].BG[2].HOffset = 0;
}
else
#endif
{
LineData[C].BG[2].VOffset = PPU.BG[2].VOffset + 1;
LineData[C].BG[2].HOffset = PPU.BG[2].HOffset;
LineData[C].BG[3].VOffset = PPU.BG[3].VOffset + 1;
LineData[C].BG[3].HOffset = PPU.BG[3].HOffset;
}
}
IPPU.CurrentLine = C + 1;
}
}
void S9xEndScreenRefresh()
{
IPPU.HDMAStarted = FALSE;
if (IPPU.RenderThisFrame) {
FLUSH_REDRAW ();
IPPU.RenderedFramesCount++;
if (IPPU.ColorsChanged) {
IPPU.ColorsChanged = FALSE;
}
if (Settings.DisplayFrameRate) {
S9xDisplayFrameRate();
}
if (GFX.InfoString) {
S9xDisplayString(GFX.InfoString);
}
S9xDeinitUpdate(IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight);
}
#ifndef RC_OPTIMIZED
S9xApplyCheats ();
#endif
#ifdef DEBUGGER
if (CPU.Flags & FRAME_ADVANCE_FLAG)
{
if (ICPU.FrameAdvanceCount)
{
ICPU.FrameAdvanceCount--;
IPPU.RenderThisFrame = TRUE;
IPPU.FrameSkip = 0;
}
else
{
CPU.Flags &= ~FRAME_ADVANCE_FLAG;
CPU.Flags |= DEBUG_MODE_FLAG;
}
}
#endif
if (CPU.SRAMModified)
{
if (!CPU.AutoSaveTimer)
{
if (!(CPU.AutoSaveTimer = Settings.AutoSaveDelay * Memory.ROMFramesPerSecond))
CPU.SRAMModified = FALSE;
}
else
{
if (!--CPU.AutoSaveTimer)
{
S9xAutoSaveSRAM ();
CPU.SRAMModified = FALSE;
}
}
}
}
void S9xSetInfoString (const char * fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (vasprintf(&GFX.InfoString, fmt, ap) > 0) {
GFX.InfoStringTimeout = 120;
} else {
GFX.InfoString = 0;
GFX.InfoStringTimeout = 0;
}
va_end(ap);
}
static inline void SelectTileRenderer (bool normal)
{
if (normal)
{
DrawTilePtr = DrawTile16;
DrawClippedTilePtr = DrawClippedTile16;
DrawLargePixelPtr = DrawLargePixel16;
}
else
{
if (GFX.r2131 & 0x80)
{
if (GFX.r2131 & 0x40)
{
if (GFX.r2130 & 2)
{
DrawTilePtr = DrawTile16Sub1_2;
DrawClippedTilePtr = DrawClippedTile16Sub1_2;
}
else
{
// Fixed colour substraction
DrawTilePtr = DrawTile16FixedSub1_2;
DrawClippedTilePtr = DrawClippedTile16FixedSub1_2;
}
DrawLargePixelPtr = DrawLargePixel16Sub1_2;
}
else
{
DrawTilePtr = DrawTile16Sub;
DrawClippedTilePtr = DrawClippedTile16Sub;
DrawLargePixelPtr = DrawLargePixel16Sub;
}
}
else
{
if (GFX.r2131 & 0x40)
{
if (GFX.r2130 & 2)
{
DrawTilePtr = DrawTile16Add1_2;
DrawClippedTilePtr = DrawClippedTile16Add1_2;
}
else
{
// Fixed colour addition
DrawTilePtr = DrawTile16FixedAdd1_2;
DrawClippedTilePtr = DrawClippedTile16FixedAdd1_2;
}
DrawLargePixelPtr = DrawLargePixel16Add1_2;
}
else
{
DrawTilePtr = DrawTile16Add;
DrawClippedTilePtr = DrawClippedTile16Add;
DrawLargePixelPtr = DrawLargePixel16Add;
}
}
}
}
void S9xSetupOBJ ()
{
int SmallSize;
int LargeSize;
switch (PPU.OBJSizeSelect)
{
case 0:
SmallSize = 8;
LargeSize = 16;
break;
case 1:
SmallSize = 8;
LargeSize = 32;
break;
case 2:
SmallSize = 8;
LargeSize = 64;
break;
case 3:
SmallSize = 16;
LargeSize = 32;
break;
case 4:
SmallSize = 16;
LargeSize = 64;
break;
case 5:
default:
SmallSize = 32;
LargeSize = 64;
break;
}
int C = 0;
int FirstSprite = PPU.FirstSprite & 0x7f;
int S = FirstSprite;
do
{
int Size;
if (PPU.OBJ [S].Size)
Size = LargeSize;
else
Size = SmallSize;
long VPos = PPU.OBJ [S].VPos;
if (VPos >= PPU.ScreenHeight)
VPos -= 256;
if (PPU.OBJ [S].HPos < 256 && PPU.OBJ [S].HPos > -Size &&
VPos < PPU.ScreenHeight && VPos > -Size)
{
GFX.OBJList [C++] = S;
GFX.Sizes[S] = Size;
GFX.VPositions[S] = VPos;
}
S = (S + 1) & 0x7f;
} while (S != FirstSprite);
// Terminate the list
GFX.OBJList [C] = -1;
IPPU.OBJChanged = FALSE;
}
static void DrawOBJS (bool 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;
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))
{
SelectTileRenderer (!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 * GFX_PIX_SIZE;
if ((Offset = (Left - PPU.OBJ[S].HPos) & 7))
{
O -= Offset * GFX_PIX_SIZE;
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 * GFX_PIX_SIZE;
}
}
else
O += PPU.OBJ[S].HPos * GFX_PIX_SIZE;
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 * GFX_PIX_SIZE,
Tile += TileInc)
{
(*DrawTilePtr) (Tile, O, TileLine, LineCount);
}
if (Offset)
{
(*DrawClippedTilePtr) (Tile, O, 0, Offset,
TileLine, LineCount);
}
}
}
}
}
}
static void DrawBackgroundMosaic (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 *) &Memory.VRAM[PPU.BG[bg].SCBase << 1];
if (PPU.BG[bg].SCSize & 1)
SC1 = SC0 + 1024;
else
SC1 = SC0;
if (PPU.BG[bg].SCSize & 2)
SC2 = SC1 + 1024;
else
SC2 = SC0;
if (PPU.BG[bg].SCSize & 1)
SC3 = SC2 + 1024;
else
SC3 = SC2;
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 * GFX_PIX_SIZE;
for (uint32 x = Left; x < Right; x += PixWidth,
s += PixWidth * GFX_PIX_SIZE,
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];
// Draw 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);
}
}