/*
 * line renderer
 * (c) Copyright Dave, 2004
 * (C) notaz, 2006-2010
 * (C) kub, 2019-2020
 *
 * This work is licensed under the terms of MAME license.
 * See COPYING file in the top-level directory.
 */
/*
 * The renderer has 4 modes now:
 * - normal
 * - shadow/hilight (s/h)
 * - "sonic mode" for midline palette changes (8bit mode only)
 * - accurate sprites (AS) [+ s/h]
 *
 * s/h uses upper bits for both priority and shadow/hilight flags.
 * "sonic mode" is autodetected, shadow/hilight is enabled by emulated game.
 * AS is enabled by user and takes priority over "sonic mode".
 *
 * since renderer always draws line in 8bit mode, there are 2 spare bits:
 * b \ mode: s/h                    sonic
 * 00        normal                 pal index
 * 01        hilight                pal index
 * 10        shadow                 pal index
 * 11        hilight|shadow=normal  pal index
 *
 * sprite s/h can only be correctly done after the plane rendering s/h state is
 * known since the s/h result changes if there's at least one high prio plane.
 * sprite op rendering is deferred until this is known, and hilight is used as
 * mark since it can't occur before sprite ops:
 * x1        op marker              pal index
 *
 * low prio s/h rendering:
 * - plane and non-op sprite pixels have shadow
 * - s/h sprite op pixel rendering is marked with hilight (deferred)
 * high prio s/h rendering:
 * - plane and non-op sprite pixels are normal
 * - all s/h sprite op pixels (either marked or high prio) are rendered
 *
 * not handled properly:
 * - high prio s/h sprite op overlapping low prio sprite shows sprite, not A,B,G
 * - in debug sprite-masked, transparent high-prio sprite px don't remove shadow
 */

#include "pico_int.h"
#define FORCE	// layer forcing via debug register?

int (*PicoScanBegin)(unsigned int num) = NULL;
int (*PicoScanEnd)  (unsigned int num) = NULL;

static unsigned char DefHighCol[8+320+8];
unsigned char *HighColBase = DefHighCol;
int HighColIncrement;

static u16 DefOutBuff[320*2] ALIGNED(4);
void *DrawLineDestBase = DefOutBuff;
int DrawLineDestIncrement;

static u32 HighCacheA[41*2+1]; // caches for high layers
static u32 HighCacheB[41*2+1];
static s32 HighPreSpr[80*2+1]; // slightly preprocessed sprites

u32 VdpSATCache[128];  // VDP sprite cache (1st 32 sprite attr bits)

// NB don't change any defines without checking their usage in ASM

#if defined(USE_BGR555)
#define PXCONV(t)   ((t & 0x000e000e)<< 1) | ((t & 0x00e000e0)<<2) | ((t & 0x0e000e00)<<3)
#define PXMASKL     0x04210421  // 0x0c630c63, LSB for all colours
#define PXMASKH     0x39ce39ce  // 0x3def3def, all but MSB for all colours
#elif defined(USE_BGR565)
#define PXCONV(t)   ((t & 0x000e000e)<< 1) | ((t & 0x00e000e0)<<3) | ((t & 0x0e000e00)<<4)
#define PXMASKL     0x08610861  // 0x18e318e3
#define PXMASKH     0x738e738e  // 0x7bef7bef
#else // RGB565
#define PXCONV(t)   ((t & 0x000e000e)<<12) | ((t & 0x00e000e0)<<3) | ((t & 0x0e000e00)>>7)
#define PXMASKL     0x08610861  // 0x18e318e3
#define PXMASKH     0x738e738e  // 0x7bef7bef
#endif

#define LF_PLANE   (1 << 0) // must be = 1
#define LF_SH      (1 << 1) // must be = 2
//#define LF_FORCE   (1 << 2)

#define LF_PLANE_A 0
#define LF_PLANE_B 1

#define SPRL_HAVE_HI     0x80 // have hi priority sprites
#define SPRL_HAVE_LO     0x40 // *lo*
#define SPRL_MAY_HAVE_OP 0x20 // may have operator sprites on the line
#define SPRL_LO_ABOVE_HI 0x10 // low priority sprites may be on top of hi
#define SPRL_HAVE_X      0x08 // have sprites with x != 0
#define SPRL_TILE_OVFL   0x04 // tile limit exceeded on previous line
#define SPRL_HAVE_MASK0  0x02 // have sprite with x == 0 in 1st slot
#define SPRL_MASKED      0x01 // lo prio masking by sprite with x == 0 active

unsigned char HighLnSpr[240][4+MAX_LINE_SPRITES+1]; // sprite_count, ^flags, tile_count, sprites_total, [spritep]..., last_width

int rendstatus_old;
int rendlines;

static int skip_next_line=0;

struct TileStrip
{
  int nametab; // Position in VRAM of name table (for this tile line)
  int line;    // Line number in pixels 0x000-0x3ff within the virtual tilemap
  int hscroll; // Horizontal scroll value in pixels for the line
  int xmask;   // X-Mask (0x1f - 0x7f) for horizontal wraparound in the tilemap
  u32 *hc;     // cache for high tile codes and their positions
  int cells;   // cells (tiles) to draw (32 col mode doesn't need to update whole 320)
};

// stuff available in asm:
#ifdef _ASM_DRAW_C
void DrawWindow(int tstart, int tend, int prio, int sh,
                struct PicoEState *est);
void DrawAllSprites(unsigned char *sprited, int prio, int sh,
                    struct PicoEState *est);
void DrawTilesFromCache(u32 *hc, int sh, int rlim,
                    struct PicoEState *est);
void DrawSpritesSHi(unsigned char *sprited, struct PicoEState *est);
void DrawLayer(int plane_sh, u32 *hcache, int cellskip, int maxcells,
               struct PicoEState *est);
void *blockcpy(void *dst, const void *src, size_t n);
void blockcpy_or(void *dst, void *src, size_t n, int pat);
#else
// utility
void blockcpy_or(void *dst, void *src, size_t n, int pat)
{
  unsigned char *pd = dst, *ps = src;
  for (; n; n--)
    *pd++ = (unsigned char) (*ps++ | pat);
}
#define blockcpy memcpy
#endif

#define TileNormMaker_(pix_func,ret)                         \
{                                                            \
  unsigned char t;                                           \
                                                             \
  t = (pack&0x0000f000)>>12; pix_func(0);                    \
  t = (pack&0x00000f00)>> 8; pix_func(1);                    \
  t = (pack&0x000000f0)>> 4; pix_func(2);                    \
  t = (pack&0x0000000f)    ; pix_func(3);                    \
  t = (pack&0xf0000000)>>28; pix_func(4);                    \
  t = (pack&0x0f000000)>>24; pix_func(5);                    \
  t = (pack&0x00f00000)>>20; pix_func(6);                    \
  t = (pack&0x000f0000)>>16; pix_func(7);                    \
  return ret;                                                \
}

#define TileFlipMaker_(pix_func,ret)                         \
{                                                            \
  unsigned char t;                                           \
                                                             \
  t = (pack&0x000f0000)>>16; pix_func(0);                    \
  t = (pack&0x00f00000)>>20; pix_func(1);                    \
  t = (pack&0x0f000000)>>24; pix_func(2);                    \
  t = (pack&0xf0000000)>>28; pix_func(3);                    \
  t = (pack&0x0000000f)    ; pix_func(4);                    \
  t = (pack&0x000000f0)>> 4; pix_func(5);                    \
  t = (pack&0x00000f00)>> 8; pix_func(6);                    \
  t = (pack&0x0000f000)>>12; pix_func(7);                    \
  return ret;                                                \
}

#define TileNormMaker(funcname, pix_func) \
static void funcname(unsigned char *pd, unsigned int pack, unsigned char pal) \
TileNormMaker_(pix_func,)

#define TileFlipMaker(funcname, pix_func) \
static void funcname(unsigned char *pd, unsigned int pack, unsigned char pal) \
TileFlipMaker_(pix_func,)

#define TileNormMakerAS(funcname, pix_func) \
static unsigned funcname(unsigned m, unsigned char *pd, unsigned int pack, unsigned char pal) \
TileNormMaker_(pix_func,m)

#define TileFlipMakerAS(funcname, pix_func) \
static unsigned funcname(unsigned m, unsigned char *pd, unsigned int pack, unsigned char pal) \
TileFlipMaker_(pix_func,m)

// draw layer or non-s/h sprite pixels (no operator colors)
#define pix_just_write(x) \
  if (likely(t)) pd[x]=pal|t

TileNormMaker(TileNorm, pix_just_write)
TileFlipMaker(TileFlip, pix_just_write)

#ifndef _ASM_DRAW_C

// draw low prio sprite non-s/h pixels in s/h mode
#define pix_nonsh(x) \
  if (likely(t)) { \
    pd[x]=pal|t; \
    if (unlikely(t==0xe)) pd[x]&=~0x80; /* disable shadow for color 14 (hw bug?) */ \
  }

TileNormMaker(TileNormNonSH, pix_nonsh)
TileFlipMaker(TileFlipNonSH, pix_nonsh)

// draw sprite pixels, process operator colors
#define pix_sh(x) \
  if (likely(t)) \
    pd[x]=(likely(t<0xe) ? pal|t : pd[x]|((t-1)<<6))

TileNormMaker(TileNormSH, pix_sh)
TileFlipMaker(TileFlipSH, pix_sh)

// draw sprite pixels, mark but don't process operator colors
#define pix_sh_markop(x) \
  if (likely(t)) \
    pd[x]=(likely(t<0xe) ? pal|t : pd[x]|0x40)

TileNormMaker(TileNormSH_markop, pix_sh_markop)
TileFlipMaker(TileFlipSH_markop, pix_sh_markop)

#endif

// draw low prio sprite operator pixels if visible (i.e. marked)
#define pix_sh_onlyop(x) \
  if (unlikely(t>=0xe && (pd[x]&0x40))) \
    pd[x]=(pd[x]&~0x40)|((t-1)<<6)

#ifndef _ASM_DRAW_C

TileNormMaker(TileNormSH_onlyop_lp, pix_sh_onlyop)
TileFlipMaker(TileFlipSH_onlyop_lp, pix_sh_onlyop)

#endif

// AS: sprite mask bits in m shifted to bits 8-15, see DrawSpritesHiAS

// draw high prio sprite pixels (AS)
#define pix_as(x) \
  if (likely(t && (m & (1<<(x+8))))) \
    m &= ~(1<<(x+8)), pd[x] = pal|t

TileNormMakerAS(TileNormAS, pix_as)
TileFlipMakerAS(TileFlipAS, pix_as)

// draw high prio sprite pixels, process operator colors (AS)
// NB sprite+planes: h+s->n, h+[nh]->h, s+[nhs]->s, hence mask h before op
#define pix_sh_as(x) \
  if (likely(t && (m & (1<<(x+8))))) { \
    m &= ~(1<<(x+8)); \
    pd[x]=(likely(t<0xe) ? pal|t : (pd[x]&~0x40)|((t-1)<<6)); \
  }

TileNormMakerAS(TileNormSH_AS, pix_sh_as)
TileFlipMakerAS(TileFlipSH_AS, pix_sh_as)

// draw only sprite operator pixels (AS)
#define pix_sh_as_onlyop(x) \
  if (likely(t && (m & (1<<(x+8))))) { \
    m &= ~(1<<(x+8)); \
    pix_sh_onlyop(x); \
  }

TileNormMakerAS(TileNormSH_AS_onlyop_lp, pix_sh_as_onlyop)
TileFlipMakerAS(TileFlipSH_AS_onlyop_lp, pix_sh_as_onlyop)

// mark low prio sprite pixels (AS)
#define pix_sh_as_onlymark(x) \
  if (likely(t)) m &= ~(1<<(x+8))

TileNormMakerAS(TileNormAS_onlymark, pix_sh_as_onlymark)
TileFlipMakerAS(TileFlipAS_onlymark, pix_sh_as_onlymark)

#ifdef FORCE
// NB s/h already resolved by non-forced drawing
// forced both layer draw (through debug reg)
#define pix_and(x) \
  pal |= 0xc0; /* leave s/h bits untouched in pixel "and" */ \
  pd[x] &= pal|t

TileNormMaker(TileNorm_and, pix_and)
TileFlipMaker(TileFlip_and, pix_and)

// forced sprite draw (through debug reg)
#define pix_sh_as_and(x) \
  pal |= 0xc0; /* leave s/h bits untouched in pixel "and" */ \
  if (likely(m & (1<<(x+8)))) { \
    m &= ~(1<<(x+8)); \
    if (t<0xe) pd[x] &= pal|t; \
  }
 
TileNormMakerAS(TileNormSH_AS_and, pix_sh_as_and)
TileFlipMakerAS(TileFlipSH_AS_and, pix_sh_as_and)
#endif

// --------------------------------------------

#ifndef _ASM_DRAW_C
static void DrawStrip(struct TileStrip *ts, int lflags, int cellskip)
{
  unsigned char *pd = Pico.est.HighCol;
  u32 *hc = ts->hc;
  int tilex, dx, ty, cells;
  u32 pack = 0, oldcode = -1, blank = -1; // The tile we know is blank
  unsigned int pal = 0, sh;

  // Draw tiles across screen:
  sh = (lflags & LF_SH) << 6; // shadow
  tilex=((-ts->hscroll)>>3)+cellskip;
  ty=(ts->line&7)<<1; // Y-Offset into tile
  dx=((ts->hscroll-1)&7)+1;
  cells = ts->cells - cellskip;
  if(dx != 8) cells++; // have hscroll, need to draw 1 cell more
  dx+=cellskip<<3;

//  int force = (lflags&LF_FORCE) << 13;
  for (; cells > 0; dx+=8, tilex++, cells--)
  {
    u32 code = PicoMem.vram[ts->nametab + (tilex & ts->xmask)];
//    code &= ~force; // forced always draw everything

    if (code == blank && !((code & 0x8000) && sh))
      continue;

    if (code!=oldcode) {
      oldcode = code;

      pack = 0;
      if (code != blank) {
        // Get tile address/2:
        u32 addr = ((code&0x7ff)<<4) + ty;
        if (code & 0x1000) addr ^= 0xe; // Y-flip

        pal = ((code>>9)&0x30) | sh; // shadow

        pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr));
        if (!pack)
          blank = code;
      }
    }

    if (code & 0x8000) { // (un-forced) high priority tile
      code |= (dx<<16) | (ty<<25);
      if (code & 0x1000) code ^= 0xe<<25;
      *hc++ = code, *hc++ = pack; // cache it
    } else if (code != blank) {
      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }

  // terminate the cache list
  *hc = 0;

  // if oldcode wasn't changed, it means all layer is hi priority
  if (oldcode == -1) Pico.est.rendstatus |= PDRAW_PLANE_HI_PRIO;
}

// this is messy
static void DrawStripVSRam(struct TileStrip *ts, int plane_sh, int cellskip)
{
  unsigned char *pd = Pico.est.HighCol;
  u32 *hc = ts->hc;
  int tilex, dx, ty = 0, addr = 0, cell = 0, nametabadd = 0;
  u32 oldcode = -1, blank = -1; // The tile we know is blank
  unsigned int pal = 0, scan = Pico.est.DrawScanline, sh, plane;

  // Draw tiles across screen:
  sh = (plane_sh & LF_SH) << 6; // shadow
  plane = (plane_sh & LF_PLANE); // plane to draw
  tilex=(-ts->hscroll)>>3;
  dx=((ts->hscroll-1)&7)+1;
  if (ts->hscroll & 0x0f) {
    int adj = ((ts->hscroll ^ dx) >> 3) & 1;
    cell -= adj + 1;
    ts->cells -= adj;
    PicoMem.vsram[0x3e] = PicoMem.vsram[0x3f] = plane_sh >> 16;
  }
  cell+=cellskip;
  tilex+=cellskip;
  dx+=cellskip<<3;

//  int force = (plane_sh&LF_FORCE) << 13;
  if ((cell&1)==1)
  {
    int line,vscroll;
    vscroll = PicoMem.vsram[plane + (cell&0x3e)];

    // Find the line in the name table
    line=(vscroll+scan)&ts->line&0xffff; // ts->line is really ymask ..
    nametabadd=(line>>3)<<(ts->line>>24);    // .. and shift[width]
    ty=(line&7)<<1; // Y-Offset into tile
  }
  for (; cell < ts->cells; dx+=8,tilex++,cell++)
  {
    u32 code, pack;

    if ((cell&1)==0)
    {
      int line,vscroll;
      vscroll = PicoMem.vsram[plane + (cell&0x3e)];

      // Find the line in the name table
      line=(vscroll+scan)&ts->line&0xffff; // ts->line is really ymask ..
      nametabadd=(line>>3)<<(ts->line>>24);    // .. and shift[width]
      ty=(line&7)<<1; // Y-Offset into tile
    }

    code= PicoMem.vram[ts->nametab + nametabadd + (tilex & ts->xmask)];
//    code &= ~force; // forced always draw everything
    code |= ty<<25; // add ty since that can change pixel row for every 2nd tile

    if (code == blank && !((code & 0x8000) && sh))
      continue;

    if (code!=oldcode) {
      oldcode = code;
      // Get tile address/2:
      addr = (code&0x7ff)<<4;

      pal = ((code>>9)&0x30) | sh; // shadow
    }

    pack = (code & 0x1000 ? ty^0xe : ty); // Y-flip
    pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr+pack));
    if (!pack)
      blank = code;

    if (code & 0x8000) { // (un-forced) high priority tile
      code |= (dx<<16);
      if (code & 0x1000) code ^= 0xe<<25;
      *hc++ = code, *hc++ = pack; // cache it
    } else if (code != blank) {
      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }

  // terminate the cache list
  *hc = 0;

  if (oldcode == -1) Pico.est.rendstatus |= PDRAW_PLANE_HI_PRIO;
}
#endif

#ifndef _ASM_DRAW_C
static
#endif
void DrawStripInterlace(struct TileStrip *ts, int plane_sh)
{
  unsigned char *pd = Pico.est.HighCol;
  u32 *hc = ts->hc;
  int tilex = 0, dx = 0, ty = 0, cells;
  u32 oldcode = -1, blank = -1; // The tile we know is blank
  unsigned int pal = 0, pack = 0, sh;

  // Draw tiles across screen:
  sh = (plane_sh & LF_SH) << 6; // shadow
  tilex=(-ts->hscroll)>>3;
  ty=(ts->line&15)<<1; // Y-Offset into tile
  dx=((ts->hscroll-1)&7)+1;
  cells = ts->cells;
  if(dx != 8) cells++; // have hscroll, need to draw 1 cell more

//  int force = (plane_sh&LF_FORCE) << 13;
  for (; cells; dx+=8,tilex++,cells--)
  {
    u32 code = PicoMem.vram[ts->nametab + (tilex & ts->xmask)];
//    code &= ~force; // forced always draw everything

    if (code == blank && !(code & 0x8000))
      continue;

    if (code!=oldcode) {
      oldcode = code;

      pack = 0;
      if (code != blank) {
        // Get tile address/2:
        u32 addr = ((code&0x3ff)<<5) + ty;
        if (code & 0x1000) addr ^= 0x1e; // Y-flip

        pal = ((code>>9)&0x30) | sh; // shadow

        pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr));
        if (!pack)
          blank = code;
      }
    }

    if (code & 0x8000) { // high priority tile
      if ((plane_sh&LF_SH) | (code!=blank)) {
        code = (code&0xfc00) | ((code&0x3ff)<<1) | (dx<<16) | (ty<<25);
        if (code & 0x1000) code ^= 0x1e<<25;
        *hc++ = code, *hc++ = pack; // cache it
      }
      continue;
    } else if (code != blank) {
      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }

  // terminate the cache list
  *hc = 0;
}

// --------------------------------------------

#ifndef _ASM_DRAW_C
static void DrawLayer(int plane_sh, u32 *hcache, int cellskip, int maxcells,
  struct PicoEState *est)
{
  struct PicoVideo *pvid=&Pico.video;
  const char shift[4]={5,6,5,7}; // 32,64 or 128 sized tilemaps (2 is invalid)
  struct TileStrip ts;
  int width, height, ymask;
  int vscroll, htab;

  ts.hc=hcache;
  ts.cells=maxcells;

  // Work out the TileStrip to draw

  // Work out the name table size: 32 64 or 128 tiles (0-3)
  width=pvid->reg[16];
  height=(width>>4)&3; width&=3;

  ts.xmask=(1<<shift[width])-1; // X Mask in tiles (0x1f-0x7f)
  ymask=(height<<8)|0xff;       // Y Mask in pixels
  switch (width) {
    case 1: ymask &= 0x1ff; break;
    case 2: ymask =  0x007; break;
    case 3: ymask =  0x0ff; break;
  }

  // Find name table:
  if (plane_sh&LF_PLANE) ts.nametab=(pvid->reg[4]&0x07)<<12; // B
  else                   ts.nametab=(pvid->reg[2]&0x38)<< 9; // A

  htab=pvid->reg[13]<<9; // Horizontal scroll table address
  switch (pvid->reg[11]&3) {
    case 1: htab += (est->DrawScanline<<1) &  0x0f; break;
    case 2: htab += (est->DrawScanline<<1) & ~0x0f; break; // Offset by tile
    case 3: htab += (est->DrawScanline<<1);         break; // Offset by line
  }
  htab+=plane_sh&LF_PLANE; // A or B

  // Get horizontal scroll value, will be masked later
  ts.hscroll = PicoMem.vram[htab & 0x7fff];

  if((pvid->reg[12]&6) == 6) {
    // interlace mode 2
    vscroll = PicoMem.vsram[plane_sh&LF_PLANE]; // Get vertical scroll value

    // Find the line in the name table
    ts.line=(vscroll+(est->DrawScanline<<1))&((ymask<<1)|1);
    ts.nametab+=(ts.line>>4)<<shift[width];

    DrawStripInterlace(&ts, plane_sh);
  } else if( pvid->reg[11]&4) {
    // shit, we have 2-cell column based vscroll
    // luckily this doesn't happen too often
    ts.line=ymask|(shift[width]<<24); // save some stuff instead of line
    // vscroll value for leftmost cells in case of hscroll not on 16px boundary
    // XXX it's unclear what exactly the hw is doing. Continue reading where it
    // stopped last seems to work best (H40: 0x50 (wrap->0x00), H32 0x40).
    plane_sh |= PicoMem.vsram[(pvid->reg[12]&1?0x00:0x20) + (plane_sh&LF_PLANE)] << 16;
    DrawStripVSRam(&ts, plane_sh, cellskip);
  } else {
    vscroll = PicoMem.vsram[plane_sh&LF_PLANE]; // Get vertical scroll value

    // Find the line in the name table
    ts.line=(vscroll+est->DrawScanline)&ymask;
    ts.nametab+=(ts.line>>3)<<shift[width];

    DrawStrip(&ts, plane_sh, cellskip);
  }
}


// --------------------------------------------

// tstart & tend are tile pair numbers
static void DrawWindow(int tstart, int tend, int prio, int sh,
                       struct PicoEState *est)
{
  unsigned char *pd = Pico.est.HighCol;
  struct PicoVideo *pvid = &Pico.video;
  int tilex,ty,nametab,code=0;
  int blank=-1; // The tile we know is blank

  // Find name table line:
  if (pvid->reg[12]&1)
  {
    nametab=(pvid->reg[3]&0x3c)<<9; // 40-cell mode
    nametab+=(est->DrawScanline>>3)<<6;
  }
  else
  {
    nametab=(pvid->reg[3]&0x3e)<<9; // 32-cell mode
    nametab+=(est->DrawScanline>>3)<<5;
  }

  tilex=tstart<<1;

  if (prio && !(est->rendstatus & PDRAW_WND_DIFF_PRIO)) {
    // all tiles processed in low prio pass
    return;
  }

  tend<<=1;
  ty=(est->DrawScanline&7)<<1; // Y-Offset into tile

  // Draw tiles across screen:
  if (!sh)
  {
    for (; tilex < tend; tilex++)
    {
      unsigned int pack;
      int dx, addr;
      int pal;

      code = PicoMem.vram[nametab + tilex];
      if ((code>>15) != prio) {
        est->rendstatus |= PDRAW_WND_DIFF_PRIO;
        continue;
      }
      if (code==blank) continue;

      // Get tile address/2:
      addr=(code&0x7ff)<<4;
      if (code&0x1000) addr+=14-ty; else addr+=ty; // Y-flip

      pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr));
      if (!pack) {
        blank = code;
        continue;
      }

      pal = ((code >> 9) & 0x30);
      dx = 8 + (tilex << 3);

      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }
  else
  {
    for (; tilex < tend; tilex++)
    {
      unsigned int pack;
      int dx, addr;
      int pal;

      code = PicoMem.vram[nametab + tilex];
      if((code>>15) != prio) {
        est->rendstatus |= PDRAW_WND_DIFF_PRIO;
        continue;
      }

      pal=((code>>9)&0x30);

      if (prio) {
        int *zb = (int *)(est->HighCol+8+(tilex<<3));
        *zb++ &= 0x7f7f7f7f;
        *zb   &= 0x7f7f7f7f;
      } else {
        pal |= 0x80;
      }
      if(code==blank) continue;

      // Get tile address/2:
      addr=(code&0x7ff)<<4;
      if (code&0x1000) addr+=14-ty; else addr+=ty; // Y-flip

      pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr));
      if (!pack) {
        blank = code;
        continue;
      }

      dx = 8 + (tilex << 3);

      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }
}

// --------------------------------------------

static void DrawTilesFromCacheShPrep(void)
{
  // as some layer has covered whole line with hi priority tiles,
  // we can process whole line and then act as if sh/hi mode was off,
  // but leave lo pri op sprite markers alone
  int c = 320/4, *zb = (int *)(Pico.est.HighCol+8);
  Pico.est.rendstatus |= PDRAW_SHHI_DONE;
  while (c--)
  {
    *zb++ &= 0x7f7f7f7f;
  }
}

static void DrawTilesFromCache(u32 *hc, int sh, int rlim, struct PicoEState *est)
{
  unsigned char *pd = Pico.est.HighCol;
  u32 code, dx;
  u32 pack;
  int pal;

  // *ts->hc++ = code | (dx<<16) | (ty<<25); // cache it

  if (sh && (est->rendstatus & (PDRAW_SHHI_DONE|PDRAW_PLANE_HI_PRIO)))
  {
    if (!(est->rendstatus & PDRAW_SHHI_DONE))
      DrawTilesFromCacheShPrep();
    sh = 0;
  }

  if (!sh)
  {
    while ((code=*hc++)) {
      pack = *hc++;
      if (!pack)
        continue;

      dx = (code >> 16) & 0x1ff;
      pal = ((code >> 9) & 0x30);
      if (rlim-dx < 0)
        goto last_cut_tile;

      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }
  else
  {
    while ((code=*hc++)) {
      unsigned char *zb;

      dx = (code >> 16) & 0x1ff;
      zb = est->HighCol+dx;
      *zb++ &= 0x7f; *zb++ &= 0x7f; *zb++ &= 0x7f; *zb++ &= 0x7f;
      *zb++ &= 0x7f; *zb++ &= 0x7f; *zb++ &= 0x7f; *zb++ &= 0x7f;

      pack = *hc++;
      if (!pack)
        continue;

      pal = ((code >> 9) & 0x30);
      if (rlim - dx < 0)
        goto last_cut_tile;

      if (code & 0x0800) TileFlip(pd + dx, pack, pal);
      else               TileNorm(pd + dx, pack, pal);
    }
  }
  return;

last_cut_tile:
  // for vertical window cutoff
  {
    unsigned int t;

    pd += dx;
    if (code&0x0800)
    {
      switch (rlim-dx+8)
      {
        case 7: t=pack&0x00000f00; if (t) pd[6]=(unsigned char)(pal|(t>> 8)); // "break" is left out intentionally
        case 6: t=pack&0x000000f0; if (t) pd[5]=(unsigned char)(pal|(t>> 4));
        case 5: t=pack&0x0000000f; if (t) pd[4]=(unsigned char)(pal|(t    ));
        case 4: t=pack&0xf0000000; if (t) pd[3]=(unsigned char)(pal|(t>>28));
        case 3: t=pack&0x0f000000; if (t) pd[2]=(unsigned char)(pal|(t>>24));
        case 2: t=pack&0x00f00000; if (t) pd[1]=(unsigned char)(pal|(t>>20));
        case 1: t=pack&0x000f0000; if (t) pd[0]=(unsigned char)(pal|(t>>16));
        default: break;
      }
    }
    else
    {
      switch (rlim-dx+8)
      {
        case 7: t=pack&0x00f00000; if (t) pd[6]=(unsigned char)(pal|(t>>20));
        case 6: t=pack&0x0f000000; if (t) pd[5]=(unsigned char)(pal|(t>>24));
        case 5: t=pack&0xf0000000; if (t) pd[4]=(unsigned char)(pal|(t>>28));
        case 4: t=pack&0x0000000f; if (t) pd[3]=(unsigned char)(pal|(t    ));
        case 3: t=pack&0x000000f0; if (t) pd[2]=(unsigned char)(pal|(t>> 4));
        case 2: t=pack&0x00000f00; if (t) pd[1]=(unsigned char)(pal|(t>> 8));
        case 1: t=pack&0x0000f000; if (t) pd[0]=(unsigned char)(pal|(t>>12));
        default: break;
      }
    }
  }
}

// --------------------------------------------

// Index + 0  :    hhhhvvvv ab--hhvv yyyyyyyy yyyyyyyy // a: offscreen h, b: offs. v, h: horiz. size
// Index + 4  :    xxxxxxxx xxxxxxxx pccvhnnn nnnnnnnn // x: x coord + 8

static void DrawSprite(s32 *sprite, int sh, int w)
{
  void (*fTileFunc)(unsigned char *pd, unsigned int pack, unsigned char pal);
  unsigned char *pd = Pico.est.HighCol;
  int width=0,height=0;
  int row=0;
  s32 code=0;
  int pal;
  int tile=0,delta=0;
  int sx, sy;

  // parse the sprite data
  sy=sprite[0];
  code=sprite[1];
  sx=code>>16; // X
  width=sy>>28;
  height=(sy>>24)&7; // Width and height in tiles
  sy=(sy<<16)>>16; // Y

  row=Pico.est.DrawScanline-sy; // Row of the sprite we are on

  if (code&0x1000) row=(height<<3)-1-row; // Flip Y

  tile=code + (row>>3); // Tile number increases going down
  delta=height; // Delta to increase tile by going right
  if (code&0x0800) { tile+=delta*(width-1); delta=-delta; } // Flip X

  tile &= 0x7ff; tile<<=4; tile+=(row&7)<<1; // Tile address
  delta<<=4; // Delta of address

  pal=(code>>9)&0x30;
  pal|=sh<<7; // shadow

  if (sh && (code&0x6000) == 0x6000) {
    if(code&0x0800) fTileFunc=TileFlipSH_markop;
    else            fTileFunc=TileNormSH_markop;
  } else if (sh) {
    if(code&0x0800) fTileFunc=TileFlipNonSH;
    else            fTileFunc=TileNormNonSH;
  } else {
    if(code&0x0800) fTileFunc=TileFlip;
    else            fTileFunc=TileNorm;
  }

  if (w) width = w; // tile limit
  for (; width; width--,sx+=8,tile+=delta)
  {
    unsigned int pack;

    if(sx<=0)   continue;
    if(sx>=328) break; // Offscreen

    pack = CPU_LE2(*(u32 *)(PicoMem.vram + (tile & 0x7fff)));
    fTileFunc(pd + sx, pack, pal);
  }
}
#endif

static void DrawSpriteInterlace(u32 *sprite)
{
  unsigned char *pd = Pico.est.HighCol;
  int width=0,height=0;
  int row=0,code=0;
  int pal;
  int tile=0,delta=0;
  int sx, sy;

  // parse the sprite data
  sy=CPU_LE2(sprite[0]);
  height=sy>>24;
  sy=(sy&0x3ff)-0x100; // Y
  width=(height>>2)&3; height&=3;
  width++; height++; // Width and height in tiles

  row=(Pico.est.DrawScanline<<1)-sy; // Row of the sprite we are on

  code=CPU_LE2(sprite[1]);
  sx=((code>>16)&0x1ff)-0x78; // X

  if (code&0x1000) row^=(16<<height)-1; // Flip Y

  tile=code&0x3ff; // Tile number
  tile+=row>>4; // Tile number increases going down
  delta=height; // Delta to increase tile by going right
  if (code&0x0800) { tile+=delta*(width-1); delta=-delta; } // Flip X

  tile<<=5; tile+=(row&15)<<1; // Tile address

  delta<<=5; // Delta of address
  pal=((code>>9)&0x30); // Get palette pointer

  for (; width; width--,sx+=8,tile+=delta)
  {
    unsigned int pack;

    if(sx<=0)   continue;
    if(sx>=328) break; // Offscreen

    pack = CPU_LE2(*(u32 *)(PicoMem.vram + (tile & 0x7fff)));
    if (code & 0x0800) TileFlip(pd + sx, pack, pal);
    else               TileNorm(pd + sx, pack, pal);
  }
}


static NOINLINE void DrawAllSpritesInterlace(int pri, int sh)
{
  struct PicoVideo *pvid=&Pico.video;
  int i,u,table,link=0,sline=Pico.est.DrawScanline<<1;
  u32 *sprites[80]; // Sprite index
  int max_sprites = Pico.video.reg[12]&1 ? 80 : 64;

  table=pvid->reg[5]&0x7f;
  if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode
  table<<=8; // Get sprite table address/2

  for (i = u = 0; u < max_sprites && link < max_sprites; u++)
  {
    u32 *sprite;
    int code, sx, sy, height;

    sprite=(u32 *)(PicoMem.vram+((table+(link<<2))&0x7ffc)); // Find sprite

    // get sprite info
    code = CPU_LE2(sprite[0]);
    sx = CPU_LE2(sprite[1]);
    if(((sx>>15)&1) != pri) goto nextsprite; // wrong priority sprite

    // check if it is on this line
    sy = (code&0x3ff)-0x100;
    height = (((code>>24)&3)+1)<<4;
    if((sline < sy) | (sline >= sy+height)) goto nextsprite; // no

    // check if sprite is not hidden offscreen
    sx = (sx>>16)&0x1ff;
    sx -= 0x78; // Get X coordinate + 8
    if((sx <= -8*3) | (sx >= 328)) goto nextsprite;

    // sprite is good, save it's pointer
    sprites[i++]=sprite;

    nextsprite:
    // Find next sprite
    link=(code>>16)&0x7f;
    if(!link) break; // End of sprites
  }

  // Go through sprites backwards:
  for (i-- ;i>=0; i--)
    DrawSpriteInterlace(sprites[i]);
}


#ifndef _ASM_DRAW_C
/*
 * s/h drawing: lo_layers|40, lo_sprites|40 && mark_op,
 *        hi_layers&=~40, hi_sprites
 *
 * Index + 0  :    hhhhvvvv ----hhvv yyyyyyyy yyyyyyyy // v, h: vert./horiz. size
 * Index + 4  :    xxxxxxxx xxxxxxxx pccvhnnn nnnnnnnn // x: x coord + 8
 */
static void DrawSpritesSHi(unsigned char *sprited, const struct PicoEState *est)
{
  static void (*tilefuncs[2][2][2])(unsigned char *, unsigned, unsigned char) = {
    { {NULL,                 NULL},                 {TileNorm,   TileFlip} },
    { {TileNormSH_onlyop_lp, TileFlipSH_onlyop_lp}, {TileNormSH, TileFlipSH} }
  }; // [sh?][hi?][flip?]
  void (*fTileFunc)(unsigned char *pd, unsigned int pack, unsigned char pal);
  unsigned char *pd = Pico.est.HighCol;
  unsigned char *p;
  int cnt, w;

  cnt = sprited[0] & 0x7f;
  if (cnt == 0) return;

  p = &sprited[4];
  if ((sprited[1] & (SPRL_TILE_OVFL|SPRL_HAVE_MASK0)) == (SPRL_TILE_OVFL|SPRL_HAVE_MASK0))
    return; // masking effective due to tile overflow

  // Go through sprites backwards:
  w = p[cnt]; // possibly clipped width of last sprite
  for (cnt--; cnt >= 0; cnt--, w = 0)
  {
    s32 *sprite, code;
    int pal, tile, sx, sy;
    int offs, delta, width, height, row;

    offs = (p[cnt] & 0x7f) * 2;
    sprite = est->HighPreSpr + offs;
    code = sprite[1];
    pal = (code>>9)&0x30;

    fTileFunc = tilefuncs[pal == 0x30][!!(code & 0x8000)][!!(code & 0x800)];
    if (fTileFunc == NULL) continue; // non-operator low sprite, already drawn

    // parse remaining sprite data
    sy=sprite[0];
    sx=code>>16; // X
    width=sy>>28;
    height=(sy>>24)&7; // Width and height in tiles
    sy=(sy<<16)>>16; // Y

    row=est->DrawScanline-sy; // Row of the sprite we are on

    if (code&0x1000) row=(height<<3)-1-row; // Flip Y

    tile=code + (row>>3); // Tile number increases going down
    delta=height; // Delta to increase tile by going right
    if (code&0x0800) { tile+=delta*(width-1); delta=-delta; } // Flip X

    tile &= 0x7ff; tile<<=4; tile+=(row&7)<<1; // Tile address
    delta<<=4; // Delta of address

    if (w) width = w; // tile limit
    for (; width; width--,sx+=8,tile+=delta)
    {
      unsigned int pack;

      if(sx<=0)   continue;
      if(sx>=328) break; // Offscreen

      pack = CPU_LE2(*(u32 *)(PicoMem.vram + (tile & 0x7fff)));
      fTileFunc(pd + sx, pack, pal);
    }
  }
}
#endif // !_ASM_DRAW_C

static void DrawSpritesHiAS(unsigned char *sprited, int sh)
{
  static unsigned (*tilefuncs[2][2][2])(unsigned, unsigned char *, unsigned, unsigned char) = {
    { {TileNormAS_onlymark,     TileFlipAS_onlymark},     {TileNormAS,    TileFlipAS} },
    { {TileNormSH_AS_onlyop_lp, TileFlipSH_AS_onlyop_lp}, {TileNormSH_AS, TileFlipSH_AS} }
  }; // [sh?][hi?][flip?]
  unsigned (*fTileFunc)(unsigned m, unsigned char *pd, unsigned int pack, unsigned char pal);
  unsigned char *pd = Pico.est.HighCol;
  unsigned char mb[sizeof(DefHighCol)/8];
  unsigned char *p, *mp;
  unsigned m;
  int entry, cnt;

  cnt = sprited[0] & 0x7f;
  if (cnt == 0) return;

  memset(mb, 0xff, sizeof(mb));
  p = &sprited[4];
  if ((sprited[1] & (SPRL_TILE_OVFL|SPRL_HAVE_MASK0)) == (SPRL_TILE_OVFL|SPRL_HAVE_MASK0))
    return; // masking effective due to tile overflow

  // Go through sprites:
  for (entry = 0; entry < cnt; entry++)
  {
    s32 *sprite, code;
    int pal, tile, sx, sy;
    int offs, delta, width, height, row;

    offs = (p[entry] & 0x7f) * 2;
    sprite = HighPreSpr + offs;
    code = sprite[1];
    pal = (code>>9)&0x30;

    fTileFunc = tilefuncs[(sh && pal == 0x30)][!!(code&0x8000)][!!(code&0x800)];

    // parse remaining sprite data
    sy=sprite[0];
    sx=code>>16; // X
    width=sy>>28;
    height=(sy>>24)&7; // Width and height in tiles
    sy=(sy<<16)>>16; // Y

    row=Pico.est.DrawScanline-sy; // Row of the sprite we are on

    if (code&0x1000) row=(height<<3)-1-row; // Flip Y

    tile=code + (row>>3); // Tile number increases going down
    delta=height; // Delta to increase tile by going right
    if (code&0x0800) { tile+=delta*(width-1); delta=-delta; } // Flip X

    tile &= 0x7ff; tile<<=4; tile+=(row&7)<<1; // Tile address
    delta<<=4; // Delta of address

    if (entry+1 == cnt) width = p[entry+1]; // last sprite width limited?
    while (sx <= 0 && width) width--, sx+=8, tile+=delta; // Offscreen
    mp = mb+(sx>>3);
    for (m = *mp; width; width--, sx+=8, tile+=delta, *mp++ = m, m >>= 8)
    {
      unsigned int pack;

      if(sx>=328) break; // Offscreen

      pack = CPU_LE2(*(u32 *)(PicoMem.vram + (tile & 0x7fff)));

      m |= mp[1] << 8; // next mask byte
      // shift mask bits to bits 8-15 for easier load/store handling
      m = fTileFunc(m << (8-(sx&0x7)), pd + sx, pack, pal) >> (8-(sx&0x7));
    } 
    *mp = m; // write last mask byte
  }
}

#ifdef FORCE
// NB lots of duplicate code, all for the sake of a small performance gain.

static void DrawStripForced(struct TileStrip *ts, int cellskip)
{
  unsigned char *pd = Pico.est.HighCol;
  int tilex, dx, ty, addr=0, cells;
  u32 code = 0, oldcode = -1;
  int pal = 0;

  // Draw tiles across screen:
  tilex=((-ts->hscroll)>>3)+cellskip;
  ty=(ts->line&7)<<1; // Y-Offset into tile
  dx=((ts->hscroll-1)&7)+1;
  cells = ts->cells - cellskip;
  if(dx != 8) cells++; // have hscroll, need to draw 1 cell more
  dx+=cellskip<<3;

  for (; cells > 0; dx+=8, tilex++, cells--)
  {
    u32 pack;

    code = PicoMem.vram[ts->nametab + (tilex & ts->xmask)];

    if (code!=oldcode) {
      oldcode = code;
      // Get tile address/2:
      addr = ((code&0x7ff)<<4) + ty;
      if (code & 0x1000) addr^=0xe; // Y-flip

      pal = (code>>9)&0x30;
    }

    pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr));

    if (code & 0x0800) TileFlip_and(pd + dx, pack, pal);
    else               TileNorm_and(pd + dx, pack, pal);
  }
}

static void DrawStripVSRamForced(struct TileStrip *ts, int plane_sh, int cellskip)
{
  unsigned char *pd = Pico.est.HighCol;
  int tilex, dx, ty=0, addr=0, cell=0, nametabadd=0;
  u32 code=0, oldcode=-1;
  int pal=0, scan=Pico.est.DrawScanline, plane;

  // Draw tiles across screen:
  plane = plane_sh & LF_PLANE;
  tilex=(-ts->hscroll)>>3;
  dx=((ts->hscroll-1)&7)+1;
  if (ts->hscroll & 0x0f) {
    int adj = ((ts->hscroll ^ dx) >> 3) & 1;
    cell -= adj + 1;
    ts->cells -= adj;
    PicoMem.vsram[0x3e] = PicoMem.vsram[0x3f] = plane_sh >> 16;
  }
  cell+=cellskip;
  tilex+=cellskip;
  dx+=cellskip<<3;

  if ((cell&1)==1)
  {
    int line,vscroll;
    vscroll = PicoMem.vsram[plane + (cell&0x3e)];

    // Find the line in the name table
    line=(vscroll+scan)&ts->line&0xffff; // ts->line is really ymask ..
    nametabadd=(line>>3)<<(ts->line>>24);    // .. and shift[width]
    ty=(line&7)<<1; // Y-Offset into tile
  }
  for (; cell < ts->cells; dx+=8,tilex++,cell++)
  {
    unsigned int pack;

    if ((cell&1)==0)
    {
      int line,vscroll;
      vscroll = PicoMem.vsram[plane + (cell&0x3e)];

      // Find the line in the name table
      line=(vscroll+scan)&ts->line&0xffff; // ts->line is really ymask ..
      nametabadd=(line>>3)<<(ts->line>>24);    // .. and shift[width]
      ty=(line&7)<<1; // Y-Offset into tile
    }

    code=PicoMem.vram[ts->nametab+nametabadd+(tilex&ts->xmask)];

    if (code!=oldcode) {
      oldcode = code;
      // Get tile address/2:
      addr=(code&0x7ff)<<4;

      pal = (code>>9)&0x30; // shadow
    }

    pack = code & 0x1000 ? ty^0xe : ty; // Y-flip
    pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr+pack));

    if (code & 0x0800) TileFlip_and(pd + dx, pack, pal);
    else               TileNorm_and(pd + dx, pack, pal);
  }
}

void DrawStripInterlaceForced(struct TileStrip *ts)
{
  unsigned char *pd = Pico.est.HighCol;
  int tilex = 0, dx = 0, ty = 0, cells;
  int oldcode = -1;
  unsigned int pal = 0, pack = 0;

  // Draw tiles across screen:
  tilex=(-ts->hscroll)>>3;
  ty=(ts->line&15)<<1; // Y-Offset into tile
  dx=((ts->hscroll-1)&7)+1;
  cells = ts->cells;
  if(dx != 8) cells++; // have hscroll, need to draw 1 cell more

  for (; cells; dx+=8,tilex++,cells--)
  {
    u32 code = PicoMem.vram[ts->nametab + (tilex & ts->xmask)];

    if (code!=oldcode) {
      oldcode = code;

      // Get tile address/2:
      u32 addr = ((code&0x3ff)<<5) + ty;
      if (code & 0x1000) addr ^= 0x1e; // Y-flip

      pal = (code>>9)&0x30; // shadow

      pack = CPU_LE2(*(u32 *)(PicoMem.vram + addr));
    }

    if (code & 0x0800) TileFlip_and(pd + dx, pack, pal);
    else               TileNorm_and(pd + dx, pack, pal);
  }
}

// XXX only duplicated to avoid ARM asm hassles
static void DrawLayerForced(int plane_sh, int cellskip, int maxcells,
  struct PicoEState *est)
{
  struct PicoVideo *pvid=&Pico.video;
  const char shift[4]={5,6,5,7}; // 32,64 or 128 sized tilemaps (2 is invalid)
  struct TileStrip ts;
  int width, height, ymask;
  int vscroll, htab;

  ts.cells=maxcells;

  // Work out the TileStrip to draw

  // Work out the name table size: 32 64 or 128 tiles (0-3)
  width=pvid->reg[16];
  height=(width>>4)&3; width&=3;

  ts.xmask=(1<<shift[width])-1; // X Mask in tiles (0x1f-0x7f)
  ymask=(height<<8)|0xff;       // Y Mask in pixels
  switch (width) {
    case 1: ymask &= 0x1ff; break;
    case 2: ymask =  0x007; break;
    case 3: ymask =  0x0ff; break;
  }

  // Find name table:
  if (plane_sh&1) ts.nametab=(pvid->reg[4]&0x07)<<12; // B
  else            ts.nametab=(pvid->reg[2]&0x38)<< 9; // A

  htab=pvid->reg[13]<<9; // Horizontal scroll table address
  switch (pvid->reg[11]&3) {
    case 1: htab += (est->DrawScanline<<1) &  0x0f; break;
    case 2: htab += (est->DrawScanline<<1) & ~0x0f; break; // Offset by tile
    case 3: htab += (est->DrawScanline<<1);         break; // Offset by line
  }
  htab+=plane_sh&1; // A or B

  // Get horizontal scroll value, will be masked later
  ts.hscroll = PicoMem.vram[htab & 0x7fff];

  if((pvid->reg[12]&6) == 6) {
    // interlace mode 2
    vscroll = PicoMem.vsram[plane_sh & 1]; // Get vertical scroll value

    // Find the line in the name table
    ts.line=(vscroll+(est->DrawScanline<<1))&((ymask<<1)|1);
    ts.nametab+=(ts.line>>4)<<shift[width];

    DrawStripInterlaceForced(&ts);
  } else if( pvid->reg[11]&4) {
    // shit, we have 2-cell column based vscroll
    // luckily this doesn't happen too often
    ts.line=ymask|(shift[width]<<24); // save some stuff instead of line
    // vscroll value for leftmost cells in case of hscroll not on 16px boundary
    // XXX it's unclear what exactly the hw is doing. Continue reading where it
    // stopped last seems to work best (H40: 0x50 (wrap->0x00), H32 0x40).
    plane_sh |= PicoMem.vsram[(pvid->reg[12]&1?0x00:0x20) + (plane_sh&1)] << 16;
    DrawStripVSRamForced(&ts, plane_sh, cellskip);
  } else {
    vscroll = PicoMem.vsram[plane_sh & 1]; // Get vertical scroll value

    // Find the line in the name table
    ts.line=(vscroll+est->DrawScanline)&ymask;
    ts.nametab+=(ts.line>>3)<<shift[width];

    DrawStripForced(&ts, cellskip);
  }
}

static void DrawSpritesForced(unsigned char *sprited)
{
  unsigned (*fTileFunc)(unsigned m, unsigned char *pd, unsigned int pack, unsigned char pal);
  unsigned char *pd = Pico.est.HighCol;
  unsigned char mb[sizeof(DefHighCol)/8];
  unsigned char *p, *mp;
  unsigned m;
  int entry, cnt;

  cnt = sprited[0] & 0x7f;
  if (cnt == 0) { memset(pd, 0, sizeof(DefHighCol)); return; }
  
  memset(mb, 0xff, sizeof(mb));
  p = &sprited[4];
  if ((sprited[1] & (SPRL_TILE_OVFL|SPRL_HAVE_MASK0)) == (SPRL_TILE_OVFL|SPRL_HAVE_MASK0))
    return; // masking effective due to tile overflow

  // Go through sprites:
  for (entry = 0; entry < cnt; entry++)
  {
    s32 *sprite, code;
    int pal, tile, sx, sy;
    int offs, delta, width, height, row;

    offs = (p[entry] & 0x7f) * 2;
    sprite = HighPreSpr + offs;
    code = sprite[1];
    pal = (code>>9)&0x30;

    if (code&0x800) fTileFunc = TileFlipSH_AS_and;
    else            fTileFunc = TileNormSH_AS_and;

    // parse remaining sprite data
    sy=sprite[0];
    sx=code>>16; // X
    width=sy>>28;
    height=(sy>>24)&7; // Width and height in tiles
    sy=(sy<<16)>>16; // Y

    row=Pico.est.DrawScanline-sy; // Row of the sprite we are on

    if (code&0x1000) row=(height<<3)-1-row; // Flip Y

    tile=code + (row>>3); // Tile number increases going down
    delta=height; // Delta to increase tile by going right
    if (code&0x0800) { tile+=delta*(width-1); delta=-delta; } // Flip X

    tile &= 0x7ff; tile<<=4; tile+=(row&7)<<1; // Tile address
    delta<<=4; // Delta of address

    if (entry+1 == cnt) width = p[entry+1]; // last sprite width limited?
    while (sx <= 0 && width) width--, sx+=8, tile+=delta; // Offscreen
    mp = mb+(sx>>3);
    for (m = *mp; width; width--, sx+=8, tile+=delta, *mp++ = m, m >>= 8)
    {
      u32 pack;

      if(sx>=328) break; // Offscreen

      pack = CPU_LE2(*(u32 *)(PicoMem.vram + (tile & 0x7fff)));

      m |= mp[1] << 8; // next mask byte
      // shift mask bits to bits 8-15 for easier load/store handling
      m = fTileFunc(m << (8-(sx&0x7)), pd + sx, pack, pal) >> (8-(sx&0x7));
    } 
    *mp = m; // write last mask byte
  }

  // anything not covered by a sprite is off (XXX or bg?)
  for (cnt = 1; cnt < sizeof(mb)-1; cnt++)
    if (mb[cnt] == 0xff) {
      *(u32 *)(pd+8*cnt+0) = 0;
      *(u32 *)(pd+8*cnt+4) = 0;
    } else if (mb[cnt])
      for (m = 0; m < 8; m++)
        if (mb[cnt] & (1<<m))
          pd[8*cnt+m] = 0;
}
#endif


// Index + 0  :    ----hhvv -lllllll -------y yyyyyyyy
// Index + 4  :    -------x xxxxxxxx pccvhnnn nnnnnnnn
// v
// Index + 0  :    hhhhvvvv ----hhvv yyyyyyyy yyyyyyyy // v, h: vert./horiz. size
// Index + 4  :    xxxxxxxx xxxxxxxx pccvhnnn nnnnnnnn // x: x coord + 8

static NOINLINE void PrepareSprites(int max_lines)
{
  const struct PicoVideo *pvid=&Pico.video;
  const struct PicoEState *est=&Pico.est;
  int u,link=0,sh;
  int table=0;
  s32 *pd = HighPreSpr;
  int max_sprites = 80, max_width = 328;
  int max_line_sprites = 20; // 20 sprites, 40 tiles

  if (!(Pico.video.reg[12]&1))
    max_sprites = 64, max_line_sprites = 16, max_width = 264;
  if (PicoIn.opt & POPT_DIS_SPRITE_LIM)
    max_line_sprites = MAX_LINE_SPRITES;

  sh = Pico.video.reg[0xC]&8; // shadow/hilight?

  table=pvid->reg[5]&0x7f;
  if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode
  table<<=8; // Get sprite table address/2

  for (u = est->DrawScanline; u < max_lines; u++)
    *((int *)&HighLnSpr[u][0]) = 0;

  for (u = 0; u < max_sprites && link < max_sprites; u++)
  {
    u32 *sprite;
    int code, code2, sx, sy, hv, height, width;

    sprite=(u32 *)(PicoMem.vram+((table+(link<<2))&0x7ffc)); // Find sprite

    // parse sprite info. the 1st half comes from the VDPs internal cache,
    // the 2nd half is read from VRAM
    code = CPU_LE2(VdpSATCache[link]); // normally same as sprite[0]
    sy = (code&0x1ff)-0x80;
    hv = (code>>24)&0xf;
    height = (hv&3)+1;
    width  = (hv>>2)+1;

    code2 = CPU_LE2(sprite[1]);
    sx = (code2>>16)&0x1ff;
    sx -= 0x78; // Get X coordinate + 8

    if (sy < max_lines && sy + (height<<3) >= est->DrawScanline) // sprite onscreen (y)?
    {
      int entry, y, w, sx_min, onscr_x, maybe_op = 0;

      sx_min = 8-(width<<3);
      onscr_x = sx_min < sx && sx < max_width;
      if (sh && (code2 & 0x6000) == 0x6000)
        maybe_op = SPRL_MAY_HAVE_OP;

      entry = ((pd - HighPreSpr) / 2) | ((code2>>8)&0x80);
      y = (sy >= est->DrawScanline) ? sy : est->DrawScanline;
      for (; y < sy + (height<<3) && y < max_lines; y++)
      {
        unsigned char *p = &HighLnSpr[y][0];
        int cnt = p[0];
        if (p[3] >= max_line_sprites) continue;         // sprite limit?
        if (p[1] & SPRL_MASKED) continue;               // masked?

        w = width;
        if (p[2] + width > max_line_sprites*2) {        // tile limit?
          if (y+1 < 240) HighLnSpr[y+1][1] |= SPRL_TILE_OVFL;
          if (p[2] >= max_line_sprites*2) continue;
          w = max_line_sprites*2 - p[2];
        }
        p[2] += w;
        p[3] ++;

        if (sx == -0x78) {
          if (p[1] & (SPRL_HAVE_X|SPRL_TILE_OVFL))
            p[1] |= SPRL_MASKED; // masked, no more sprites for this line
          if (!(p[1] & SPRL_HAVE_X) && cnt == 0)
            p[1] |= SPRL_HAVE_MASK0; // 1st sprite is masking
        } else
          p[1] |= SPRL_HAVE_X;

        if (!onscr_x) continue; // offscreen x

        p[4+cnt] = entry;
        p[5+cnt] = w; // width clipped by tile limit for sprite renderer
        p[0] = cnt + 1;
        p[1] |= (entry & 0x80) ? SPRL_HAVE_HI : SPRL_HAVE_LO;
        p[1] |= maybe_op; // there might be op sprites on this line
        if (cnt > 0 && (code2 & 0x8000) && !(p[4+cnt-1]&0x80))
          p[1] |= SPRL_LO_ABOVE_HI;
      }
    }

    *pd++ = (width<<28)|(height<<24)|(hv<<16)|((unsigned short)sy);
    *pd++ = (sx<<16)|((unsigned short)code2);

    // Find next sprite
    link=(code>>16)&0x7f;
    if (!link) break; // End of sprites
  }
  *pd = 0;

#if 0
  for (u = 0; u < max_lines; u++)
  {
    int y;
    printf("c%03i: f %x c %2i/%2i w %2i: ", u, HighLnSpr[u][1],
           HighLnSpr[u][0], HighLnSpr[u][3], HighLnSpr[u][2]);
    for (y = 0; y < HighLnSpr[u][0]; y++) {
      s32 *sp = HighPreSpr + (HighLnSpr[u][y+4]&0x7f) * 2;
      printf(" %i(%x/%x)", HighLnSpr[u][y+4],sp[0],sp[1]);
    }
    printf("\n");
  }
#endif
}

#ifndef _ASM_DRAW_C
static void DrawAllSprites(unsigned char *sprited, int prio, int sh,
                           struct PicoEState *est)
{
  unsigned char *p;
  int cnt, w;

  cnt = sprited[0] & 0x7f;
  if (cnt == 0) return;

  p = &sprited[4];
  if ((sprited[1] & (SPRL_TILE_OVFL|SPRL_HAVE_MASK0)) == (SPRL_TILE_OVFL|SPRL_HAVE_MASK0))
    return; // masking effective due to tile overflow

  // Go through sprites backwards:
  w = p[cnt]; // possibly clipped width of last sprite
  for (cnt--; cnt >= 0; cnt--, w = 0)
  {
    s32 *sp = HighPreSpr + (p[cnt]&0x7f) * 2;
    if ((p[cnt] >> 7) != prio) continue;
    DrawSprite(sp, sh, w);
  }
}


// --------------------------------------------

void BackFill(int reg7, int sh, struct PicoEState *est)
{
  unsigned int back;

  // Start with a blank scanline (background colour):
  back=reg7&0x3f;
  back|=sh<<7; // shadow
  back|=back<<8;
  back|=back<<16;

  memset32((int *)(est->HighCol+8), back, 320/4);
}
#endif

// --------------------------------------------

void PicoDoHighPal555_8bit(int sh, int line, struct PicoEState *est)
{
  unsigned int *spal, *dpal;
  unsigned int cnt = (sh ? 1 : est->SonicPalCount+1);
  unsigned int t, i;

  // reset dirty only if there are no outstanding changes
  if (Pico.m.dirtyPal == 2)
    Pico.m.dirtyPal = 0;

  // In Sonic render mode palettes were backuped in SonicPal
  spal = (void *)est->SonicPal;
  dpal = (void *)est->HighPal;

  // additional palettes stored after in-frame changes
  for (i = 0; i < cnt * 0x40 / 2; i++) {
    t = spal[i];
    // treat it like it was 4-bit per channel, since in s/h mode it somewhat is that.
    // otherwise intensity difference between this and s/h will be wrong
    t = PXCONV(t);
    t |= (t >> 4) & PXMASKL;
    dpal[i] = t;
  }

  // norm: xxx0, sh: 0xxx, hi: 0xxx + 7
  if (sh)
  {
    // shadowed pixels
    for (i = 0; i < 0x40 / 2; i++) {
      dpal[0xc0/2 + i] = dpal[i];
      dpal[0x80/2 + i] = (dpal[i] >> 1) & PXMASKH;
    }
    // hilighted pixels
    for (i = 0; i < 0x40 / 2; i++) {
      t = ((dpal[i] >> 1) & PXMASKH) + PXMASKH;
      t |= (t >> 4) & PXMASKL;
      dpal[0x40/2 + i] = t;
    }
  }
}

#ifndef _ASM_DRAW_C
void PicoDoHighPal555(int sh, int line, struct PicoEState *est)
{
  unsigned int *spal, *dpal;
  unsigned int t, i;

  Pico.m.dirtyPal = 0;

  spal = (void *)PicoMem.cram;
  dpal = (void *)est->HighPal;

  for (i = 0; i < 0x40 / 2; i++) {
    t = spal[i];
    // treat it like it was 4-bit per channel, since in s/h mode it somewhat is that.
    // otherwise intensity difference between this and s/h will be wrong
    t = PXCONV(t);
    t |= (t >> 4) & PXMASKL;
    dpal[i] = dpal[0xc0/2 + i] = t;
  }

  // norm: xxx0, sh: 0xxx, hi: 0xxx + 7
  if (sh)
  {
    // shadowed pixels
    for (i = 0; i < 0x40 / 2; i++)
      dpal[0x80/2 + i] = (dpal[i] >> 1) & PXMASKH;
    // hilighted pixels
    for (i = 0; i < 0x40 / 2; i++) {
      t = ((dpal[i] >> 1) & PXMASKH) + PXMASKH;
      t |= (t >> 4) & PXMASKL;
      dpal[0x40/2 + i] = t;
    }
  }
}

void FinalizeLine555(int sh, int line, struct PicoEState *est)
{
  unsigned short *pd=est->DrawLineDest;
  unsigned char  *ps=est->HighCol+8;
  unsigned short *pal=est->HighPal;
  int len;

  if (DrawLineDestIncrement == 0)
    return;

  PicoDrawUpdateHighPal();

  if (Pico.video.reg[12]&1) {
    len = 320;
  } else {
    if (!(PicoIn.opt&POPT_DIS_32C_BORDER)) pd+=32;
    len = 256;
  }

  {
#if 1
    int i;

    for (i = len; i > 0; i-=4) {
      *pd++ = pal[*ps++];
      *pd++ = pal[*ps++];
      *pd++ = pal[*ps++];
      *pd++ = pal[*ps++];
    }
#else
    extern void amips_clut(unsigned short *dst, unsigned char *src, unsigned short *pal, int count);
    extern void amips_clut_6bit(unsigned short *dst, unsigned char *src, unsigned short *pal, int count);
    if (!sh)
         amips_clut_6bit(pd, ps, pal, len);
    else amips_clut(pd, ps, pal, len);
#endif
  }
}
#endif

static void FinalizeLine8bit(int sh, int line, struct PicoEState *est)
{
  unsigned char *pd = est->DrawLineDest;
  int len;
  static int dirty_line;

  if (Pico.m.dirtyPal == 1)
  {
    // a hack for mid-frame palette changes
    if (!(est->rendstatus & PDRAW_SONIC_MODE) | (line - dirty_line > 4)) {
      // store a maximum of 2 additional palettes in SonicPal
      if (est->SonicPalCount < 2)
        est->SonicPalCount ++;
      dirty_line = line;
      est->rendstatus |= PDRAW_SONIC_MODE;
    }
    blockcpy(est->SonicPal+est->SonicPalCount*0x40, PicoMem.cram, 0x40*2);
    Pico.m.dirtyPal = 2;
  }

  if (Pico.video.reg[12]&1) {
    len = 320;
  } else {
    if (!(PicoIn.opt & POPT_DIS_32C_BORDER))
      pd += 32;
    len = 256;
  }

  if (DrawLineDestIncrement == 0) {
    if (!sh && (est->rendstatus & PDRAW_SONIC_MODE))
      blockcpy_or(pd+8, est->HighCol+8, len, est->SonicPalCount*0x40);
  } else if (!sh && (est->rendstatus & PDRAW_SONIC_MODE)) {
    // select active backup palette
    blockcpy_or(pd, est->HighCol+8, len, est->SonicPalCount*0x40);
  } else {
    blockcpy(pd, est->HighCol+8, len);
  }
}

static void (*FinalizeLine)(int sh, int line, struct PicoEState *est);

// --------------------------------------------

static int DrawDisplay(int sh)
{
  struct PicoEState *est=&Pico.est;
  unsigned char *sprited = &HighLnSpr[est->DrawScanline][0];
  struct PicoVideo *pvid=&Pico.video;
  int win=0, edge=0, hvwind=0, lflags;
  int maxw, maxcells;

  est->rendstatus &= ~(PDRAW_SHHI_DONE|PDRAW_PLANE_HI_PRIO|PDRAW_WND_DIFF_PRIO);

  if (pvid->reg[12]&1) {
    maxw = 328; maxcells = 40;
  } else {
    maxw = 264; maxcells = 32;
  }

  // Find out if the window is on this line:
  win=pvid->reg[0x12];
  edge=(win&0x1f)<<3;

  if (win&0x80) { if (est->DrawScanline>=edge) hvwind=1; }
  else          { if (est->DrawScanline< edge) hvwind=1; }

  if (!hvwind) // we might have a vertical window here
  {
    win=pvid->reg[0x11];
    edge=win&0x1f;
    if (win&0x80) {
      if (!edge) hvwind=1;
      else if(edge < (maxcells>>1)) hvwind=2;
    } else {
      if (!edge);
      else if(edge < (maxcells>>1)) hvwind=2;
      else hvwind=1;
    }
  }

  /* - layer B low - */
  if (!(pvid->debug_p & PVD_KILL_B)) {
    lflags = LF_PLANE_B | (sh<<1);
    DrawLayer(lflags, HighCacheB, 0, maxcells, est);
  }
  /* - layer A low - */
  lflags = LF_PLANE_A | (sh<<1);
  if (pvid->debug_p & PVD_KILL_A)
    ;
  else if (hvwind == 1)
    DrawWindow(0, maxcells>>1, 0, sh, est);
  else if (hvwind == 2) {
    DrawLayer(lflags, HighCacheA, (win&0x80) ?    0 : edge<<1, (win&0x80) ?     edge<<1 : maxcells, est);
    DrawWindow(                   (win&0x80) ? edge :       0, (win&0x80) ? maxcells>>1 : edge, 0, sh, est);
  }
  else
    DrawLayer(lflags, HighCacheA, 0, maxcells, est);
  /* - sprites low - */
  if (pvid->debug_p & PVD_KILL_S_LO)
    ;
  else if (est->rendstatus & PDRAW_INTERLACE)
    DrawAllSpritesInterlace(0, sh);
  else if (sprited[1] & SPRL_HAVE_LO)
    DrawAllSprites(sprited, 0, sh, est);

  /* - layer B hi - */
  if (!(pvid->debug_p & PVD_KILL_B) && HighCacheB[0])
    DrawTilesFromCache(HighCacheB, sh, maxw, est);
  /* - layer A hi - */
  if (pvid->debug_p & PVD_KILL_A)
    ;
  else if (hvwind == 1)
    DrawWindow(0, maxcells>>1, 1, sh, est);
  else if (hvwind == 2) {
    if (HighCacheA[0])
      DrawTilesFromCache(HighCacheA, sh, (win&0x80) ? edge<<4 : maxw, est);
    DrawWindow((win&0x80) ? edge : 0, (win&0x80) ? maxcells>>1 : edge, 1, sh, est);
  } else
    if (HighCacheA[0])
      DrawTilesFromCache(HighCacheA, sh, maxw, est);
  /* - sprites hi - */
  if (pvid->debug_p & PVD_KILL_S_HI)
    ;
  else if (est->rendstatus & PDRAW_INTERLACE)
    DrawAllSpritesInterlace(1, sh);
  // have sprites without layer pri bit ontop of sprites with that bit
  else if ((sprited[1] & SPRL_LO_ABOVE_HI) && (PicoIn.opt & POPT_ACC_SPRITES))
    DrawSpritesHiAS(sprited, sh);
  else if (sh && (sprited[1] & SPRL_MAY_HAVE_OP))
    DrawSpritesSHi(sprited, est);
  else if (sprited[1] & SPRL_HAVE_HI)
    DrawAllSprites(sprited, 1, 0, est);

#ifdef FORCE
  if (pvid->debug_p & PVD_FORCE_B) {
    lflags = LF_PLANE_B | (sh<<1);
    DrawLayerForced(lflags, 0, maxcells, est);
  } else if (pvid->debug_p & PVD_FORCE_A) {
    lflags = LF_PLANE_A | (sh<<1);
    DrawLayerForced(lflags, 0, maxcells, est);
  } else if (pvid->debug_p & PVD_FORCE_S)
    DrawSpritesForced(sprited);
#endif

#if 0
  {
    int *c, a, b;
    for (a = 0, c = HighCacheA; *c; c+=2, a++);
    for (b = 0, c = HighCacheB; *c; c+=2, b++);
    printf("%i:%03i: a=%i, b=%i\n", Pico.m.frame_count,
           Pico.est.DrawScanline, a, b);
  }
#endif

  return 0;
}

// MUST be called every frame
PICO_INTERNAL void PicoFrameStart(void)
{
  int offs = 8, lines = 224;
  int dirty = ((Pico.est.rendstatus & PDRAW_SONIC_MODE) || Pico.m.dirtyPal);
  int sprep = Pico.est.rendstatus & (PDRAW_SPRITES_MOVED|PDRAW_DIRTY_SPRITES);
  int skipped = Pico.est.rendstatus & PDRAW_SKIP_FRAME;

  // prepare to do this frame
  Pico.est.rendstatus = 0;
  if ((Pico.video.reg[12] & 6) == 6)
    Pico.est.rendstatus |= PDRAW_INTERLACE; // interlace mode
  if (!(Pico.video.reg[12] & 1))
    Pico.est.rendstatus |= PDRAW_32_COLS;
  if (Pico.video.reg[1] & 8) {
    Pico.est.rendstatus |= PDRAW_30_ROWS;
    offs = 0;
    lines = 240;
  }

  if (Pico.est.rendstatus != rendstatus_old || lines != rendlines) {
    rendlines = lines;
    // mode_change() might reset rendstatus_old by calling SetColorFormat
    emu_video_mode_change((lines == 240) ? 0 : 8,
      lines, (Pico.video.reg[12] & 1) ? 0 : 1);
    rendstatus_old = Pico.est.rendstatus;
  }
  if (PicoIn.skipFrame) // preserve this until something is rendered at last
    Pico.est.rendstatus |= PDRAW_SKIP_FRAME;
  if (sprep | skipped)
    Pico.est.rendstatus |= PDRAW_PARSE_SPRITES;

  Pico.est.HighCol = HighColBase + offs * HighColIncrement;
  Pico.est.DrawLineDest = (char *)DrawLineDestBase + offs * DrawLineDestIncrement;
  Pico.est.DrawScanline = 0;
  skip_next_line = 0;

  if (FinalizeLine == FinalizeLine8bit) {
    // make a backup of the current palette in case Sonic mode is detected later
    Pico.est.SonicPalCount = 0;
    Pico.m.dirtyPal = (dirty ? 2 : 0); // mark as dirty but already copied
    blockcpy(Pico.est.SonicPal, PicoMem.cram, 0x40*2);
  }
}

static void DrawBlankedLine(int line, int offs, int sh, int bgc)
{
  if (PicoScanBegin != NULL)
    PicoScanBegin(line + offs);

  BackFill(bgc, sh, &Pico.est);

  if (FinalizeLine != NULL)
    FinalizeLine(sh, line, &Pico.est);

  if (PicoScanEnd != NULL)
    PicoScanEnd(line + offs);

  Pico.est.HighCol += HighColIncrement;
  Pico.est.DrawLineDest = (char *)Pico.est.DrawLineDest + DrawLineDestIncrement;
}

static void PicoLine(int line, int offs, int sh, int bgc)
{
  int skip = 0;

  if (skip_next_line > 0) {
    skip_next_line--;
    return;
  }

  Pico.est.DrawScanline = line;
  if (PicoScanBegin != NULL)
    skip = PicoScanBegin(line + offs);

  if (skip) {
    skip_next_line = skip - 1;
    return;
  }

  if (Pico.video.debug_p & (PVD_FORCE_A | PVD_FORCE_B | PVD_FORCE_S))
    bgc = 0x3f;

  // Draw screen:
  BackFill(bgc, sh, &Pico.est);
  if (Pico.video.reg[1]&0x40)
    DrawDisplay(sh);

  if (FinalizeLine != NULL)
    FinalizeLine(sh, line, &Pico.est);

  if (PicoScanEnd != NULL)
    skip_next_line = PicoScanEnd(line + offs);

  Pico.est.HighCol += HighColIncrement;
  Pico.est.DrawLineDest = (char *)Pico.est.DrawLineDest + DrawLineDestIncrement;
}

void PicoDrawSync(int to, int blank_last_line)
{
  struct PicoEState *est = &Pico.est;
  int line, offs = 0;
  int sh = (Pico.video.reg[0xC] & 8) >> 3; // shadow/hilight?
  int bgc = Pico.video.reg[7];

  pprof_start(draw);

  if (rendlines != 240) {
    offs = 8;
    if (to > 223)
      to = 223;
  }
  if (est->DrawScanline <= to - blank_last_line && (est->rendstatus &
                (PDRAW_SPRITES_MOVED|PDRAW_DIRTY_SPRITES|PDRAW_PARSE_SPRITES)))
    PrepareSprites(to - blank_last_line + 1);

  for (line = est->DrawScanline; line < to; line++)
    PicoLine(line, offs, sh, bgc);

  // last line
  if (line <= to)
  {
    if (blank_last_line)
         DrawBlankedLine(line, offs, sh, bgc);
    else PicoLine(line, offs, sh, bgc);
    line++;
  }
  est->DrawScanline = line;

  pprof_end(draw);
}

// also works for fast renderer
void PicoDrawUpdateHighPal(void)
{
  struct PicoEState *est = &Pico.est;
  if (Pico.m.dirtyPal) {
    int sh = (Pico.video.reg[0xC] & 8) >> 3; // shadow/hilight?
    if ((PicoIn.opt & POPT_ALT_RENDERER) | (est->rendstatus & PDRAW_SONIC_MODE))
      sh = 0; // no s/h support

    if (PicoIn.AHW & PAHW_SMS)
      PicoDoHighPal555M4();
    else if (FinalizeLine == FinalizeLine8bit)
      PicoDoHighPal555_8bit(sh, 0, est);
    else
      PicoDoHighPal555(sh, 0, est);

    // cover for sprite priority bits if not in s/h or sonic mode
    if (!sh && !(est->rendstatus & PDRAW_SONIC_MODE)) {
      blockcpy(est->HighPal+0x40, est->HighPal, 0x40*2);
      blockcpy(est->HighPal+0x80, est->HighPal, 0x80*2);
    }
  }
}

void PicoDrawSetOutFormat(pdso_t which, int use_32x_line_mode)
{
  PicoDrawSetInternalBuf(NULL, 0);
  PicoDrawSetOutBufMD(NULL, 0);
  PicoDraw2SetOutBuf(NULL, 0);
  switch (which)
  {
    case PDF_8BIT:
      FinalizeLine = FinalizeLine8bit;
      PicoDrawSetInternalBuf(Pico.est.Draw2FB, 328);
      break;

    case PDF_RGB555:
      if ((PicoIn.AHW & PAHW_32X) && use_32x_line_mode)
        FinalizeLine = FinalizeLine32xRGB555;
      else
        FinalizeLine = FinalizeLine555;
      break;

    default:
      FinalizeLine = NULL;
      break;
  }
  if (PicoIn.AHW & PAHW_32X)
    PicoDrawSetOutFormat32x(which, use_32x_line_mode);
  PicoDrawSetOutputMode4(which);
  rendstatus_old = -1;
  Pico.m.dirtyPal = 1;
}

void PicoDrawSetOutBufMD(void *dest, int increment)
{
  if (FinalizeLine == FinalizeLine8bit && increment >= 328) {
    // kludge for no-copy mode, using ALT_RENDERER layout
    PicoDrawSetInternalBuf(dest, increment);
  } else if (FinalizeLine == NULL) {
    PicoDrawSetInternalBuf(dest, increment); // needed for Mode4
    PicoDraw2SetOutBuf(dest, increment);
  } else if (dest != NULL) {
    DrawLineDestBase = dest;
    DrawLineDestIncrement = increment;
    Pico.est.DrawLineDest = (char *)DrawLineDestBase + Pico.est.DrawScanline * increment;
  } else {
    DrawLineDestBase = DefOutBuff;
    DrawLineDestIncrement = 0;
    Pico.est.DrawLineDest = DefOutBuff;
  }
}

// note: may be called on the middle of frame
void PicoDrawSetOutBuf(void *dest, int increment)
{
  if (PicoIn.AHW & PAHW_32X)
    PicoDrawSetOutBuf32X(dest, increment);
  else
    PicoDrawSetOutBufMD(dest, increment);
}

void PicoDrawSetInternalBuf(void *dest, int increment)
{
  if (dest != NULL) {
    HighColBase = dest;
    HighColIncrement = increment;
    Pico.est.HighCol = HighColBase + Pico.est.DrawScanline * increment;
  }
  else {
    HighColBase = DefHighCol;
    HighColIncrement = 0;
    Pico.est.HighCol = DefHighCol;
  }
}

void PicoDrawSetCallbacks(int (*begin)(unsigned int num), int (*end)(unsigned int num))
{
  PicoScanBegin = NULL;
  PicoScanEnd = NULL;
  PicoScan32xBegin = NULL;
  PicoScan32xEnd = NULL;

  if ((PicoIn.AHW & PAHW_32X) && FinalizeLine != FinalizeLine32xRGB555) {
    PicoScan32xBegin = begin;
    PicoScan32xEnd = end;
  }
  else {
    PicoScanBegin = begin;
    PicoScanEnd = end;
  }
}

void PicoDrawInit(void)
{
  Pico.est.DrawLineDest = DefOutBuff;
  Pico.est.HighCol = HighColBase;
  Pico.est.HighPreSpr = HighPreSpr;
  rendstatus_old = -1;
}

// vim:ts=2:sw=2:expandtab
