+/*
+ * mode4/SMS renderer
+ * (C) notaz, 2009-2010
+ *
+ * This work is licensed under the terms of MAME license.
+ * See COPYING file in the top-level directory.
+ */
+/*
+ * TODO:
+ * - TMS9918 modes?
+ * - gg mode?
+ * - column scroll (reg 0 bit7)
+ * - 224/240 line modes
+ * - doubled sprites
+ */
#include "pico_int.h"
-static void (*FinalizeLineM4)(void);
+static void (*FinalizeLineM4)(int line);
static int skip_next_line;
+static int screen_offset;
#define PLANAR_PIXEL(x,p) \
t = pack & (0x80808080 >> p); \
static int TileNormM4(int sx, int addr, int pal)
{
- unsigned char *pd = HighCol + sx;
+ unsigned char *pd = Pico.est.HighCol + sx;
unsigned int pack, t;
pack = *(unsigned int *)(Pico.vram + addr); /* Get 4 bitplanes / 8 pixels */
static int TileFlipM4(int sx,int addr,int pal)
{
- unsigned char *pd = HighCol + sx;
+ unsigned char *pd = Pico.est.HighCol + sx;
unsigned int pack, t;
pack = *(unsigned int *)(Pico.vram + addr); /* Get 4 bitplanes / 8 pixels */
return 1; /* Tile blank */
}
-struct TileStrip
+static void draw_sprites(int scanline)
{
- 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
- int *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)
-};
-
-static void DrawStrip(struct TileStrip *ts, int cellskip)
+ struct PicoVideo *pv = &Pico.video;
+ unsigned int sprites_addr[8];
+ unsigned int sprites_x[8];
+ unsigned char *sat;
+ int xoff = 8; // relative to HighCol, which is (screen - 8)
+ int sprite_base, addr_mask;
+ int i, s, h;
+
+ if (pv->reg[0] & 8)
+ xoff = 0;
+
+ sat = (unsigned char *)Pico.vram + ((pv->reg[5] & 0x7e) << 7);
+ if (pv->reg[1] & 2) {
+ addr_mask = 0xfe; h = 16;
+ } else {
+ addr_mask = 0xff; h = 8;
+ }
+ sprite_base = (pv->reg[6] & 4) << (13-2-1);
+
+ for (i = s = 0; i < 64 && s < 8; i++)
+ {
+ int y;
+ y = sat[i] + 1;
+ if (y == 0xd1)
+ break;
+ if (y + h <= scanline || scanline < y)
+ continue; // not on this line
+
+ sprites_x[s] = xoff + sat[0x80 + i*2];
+ sprites_addr[s] = sprite_base + ((sat[0x80 + i*2 + 1] & addr_mask) << (5-1)) +
+ ((scanline - y) << (2-1));
+ s++;
+ }
+
+ // now draw all sprites backwards
+ for (--s; s >= 0; s--)
+ TileNormM4(sprites_x[s], sprites_addr[s], 0x10);
+}
+
+// tilex_ty_prio merged to reduce register pressure
+static void draw_strip(const unsigned short *nametab, int dx, int cells, int tilex_ty_prio)
{
- int tilex,dx,ty,code=0,addr=0,cells;
- int oldcode=-1,blank=-1; // The tile we know is blank
- int pal=0;
+ int oldcode = -1, blank = -1; // The tile we know is blank
+ int addr = 0, 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--)
+ for (; cells > 0; dx += 8, tilex_ty_prio++, cells--)
{
- int zero;
+ int code, zero;
- code=Pico.vram[ts->nametab + (tilex & 0x1f)];
- if (code==blank) continue;
+ code = nametab[tilex_ty_prio & 0x1f];
+ if (code == blank)
+ continue;
+ if ((code ^ tilex_ty_prio) & 0x1000) // priority differs?
+ continue;
- if (code!=oldcode) {
+ if (code != oldcode) {
oldcode = code;
// Get tile address/2:
- addr=(code&0x1ff)<<4;
- addr+=ty;
- if (code&0x0400) addr^=0xe; // Y-flip
+ addr = (code & 0x1ff) << 4;
+ addr += tilex_ty_prio >> 16;
+ if (code & 0x0400)
+ addr ^= 0xe; // Y-flip
- pal=((code>>7)&0x10);
+ pal = (code>>7) & 0x10;
}
- if (code&0x0200) zero=TileFlipM4(dx,addr,pal);
- else zero=TileNormM4(dx,addr,pal);
+ if (code&0x0200) zero = TileFlipM4(dx, addr, pal);
+ else zero = TileNormM4(dx, addr, pal);
- if (zero) blank=code; // We know this tile is blank now
+ if (zero)
+ blank = code; // We know this tile is blank now
}
}
-static void DrawLayer(int cellskip, int maxcells)
+static void DrawDisplayM4(int scanline)
{
- struct PicoVideo *pvid=&Pico.video;
- struct TileStrip ts;
- int vscroll;
-
- ts.cells=maxcells;
-
- // Find name table:
- ts.nametab=(pvid->reg[2]&0x0e) << (10-1);
-
- // Get horizontal scroll value, will be masked later
- ts.hscroll=0;//pvid->reg[8];
- vscroll=0;//pvid->reg[9]; // Get vertical scroll value
+ struct PicoVideo *pv = &Pico.video;
+ unsigned short *nametab;
+ int line, tilex, dx, ty, cells;
+ int cellskip = 0; // XXX
+ int maxcells = 32;
// Find the line in the name table
- ts.line=(vscroll+DrawScanline)&0xff;
- ts.nametab+=(ts.line>>3) << (6-1);
-
- DrawStrip(&ts, cellskip);
-}
+ line = pv->reg[9] + scanline; // vscroll + scanline
+ if (line >= 224)
+ line -= 224;
-static void DrawDisplayM4(void)
-{
- DrawLayer(0, 32);
+ // Find name table:
+ nametab = Pico.vram;
+ nametab += (pv->reg[2] & 0x0e) << (10-1);
+ nametab += (line>>3) << (6-1);
+
+ dx = pv->reg[8]; // hscroll
+ if (scanline < 16 && (pv->reg[0] & 0x40))
+ dx = 0; // hscroll disabled for top 2 rows
+
+ tilex = ((-dx >> 3) + cellskip) & 0x1f;
+ ty = (line & 7) << 1; // Y-Offset into tile
+ cells = maxcells - cellskip;
+
+ dx = ((dx - 1) & 7) + 1;
+ if (dx != 8)
+ cells++; // have hscroll, need to draw 1 cell more
+ dx += cellskip << 3;
+
+ // low priority tiles
+ if (!(pv->debug_p & PVD_KILL_B))
+ draw_strip(nametab, dx, cells, tilex | 0x0000 | (ty << 16));
+
+ // sprites
+ if (!(pv->debug_p & PVD_KILL_S_LO))
+ draw_sprites(scanline);
+
+ // high priority tiles (use virtual layer switch just for fun)
+ if (!(pv->debug_p & PVD_KILL_A))
+ draw_strip(nametab, dx, cells, tilex | 0x1000 | (ty << 16));
+
+ if (pv->reg[0] & 0x20)
+ // first column masked
+ ((int *)Pico.est.HighCol)[2] = ((int *)Pico.est.HighCol)[3] = 0xe0e0e0e0;
}
void PicoFrameStartMode4(void)
{
- DrawScanline = 0;
+ int lines = 192;
skip_next_line = 0;
+ screen_offset = 24;
+ Pico.est.rendstatus = PDRAW_32_COLS;
+
+ if ((Pico.video.reg[0] & 6) == 6 && (Pico.video.reg[1] & 0x18)) {
+ if (Pico.video.reg[1] & 0x08) {
+ screen_offset = 0;
+ lines = 240;
+ }
+ else {
+ screen_offset = 8;
+ lines = 224;
+ }
+ }
+
+ if (Pico.est.rendstatus != rendstatus_old || lines != rendlines) {
+ emu_video_mode_change(screen_offset, lines, 1);
+ rendstatus_old = Pico.est.rendstatus;
+ rendlines = lines;
+ }
+
+ Pico.est.DrawLineDest = (char *)DrawLineDestBase + screen_offset * DrawLineDestIncrement;
}
void PicoLineMode4(int line)
return;
}
- DrawScanline = line;
-
if (PicoScanBegin != NULL)
- skip_next_line = PicoScanBegin(DrawScanline);
+ skip_next_line = PicoScanBegin(line + screen_offset);
// Draw screen:
- BackFill((Pico.video.reg[7] & 0x0f) | 0x10, 0);
+ BackFill(Pico.video.reg[7] & 0x0f, 0, &Pico.est);
if (Pico.video.reg[1] & 0x40)
- DrawDisplayM4();
+ DrawDisplayM4(line);
if (FinalizeLineM4 != NULL)
- FinalizeLineM4();
+ FinalizeLineM4(line);
if (PicoScanEnd != NULL)
- skip_next_line = PicoScanEnd(DrawScanline);
+ skip_next_line = PicoScanEnd(line + screen_offset);
+
+ Pico.est.DrawLineDest = (char *)Pico.est.DrawLineDest + DrawLineDestIncrement;
}
void PicoDoHighPal555M4(void)
{
unsigned int *spal=(void *)Pico.cram;
- unsigned int *dpal=(void *)HighPal;
+ unsigned int *dpal=(void *)Pico.est.HighPal;
unsigned int t;
int i;
t |= (t >> 4) & 0x08610861;
*dpal = t;
}
+ Pico.est.HighPal[0xe0] = 0;
}
-static void FinalizeLineRGB555M4(void)
+static void FinalizeLineRGB555M4(int line)
{
- unsigned short *pd=DrawLineDest;
- unsigned char *ps=HighCol+8;
- unsigned short *pal=HighPal;
- int i;
-
if (Pico.m.dirtyPal)
PicoDoHighPal555M4();
+ // standard FinalizeLine can finish it for us,
+ // with features like scaling and such
+ FinalizeLine555(0, line, &Pico.est);
+}
+
+static void FinalizeLine8bitM4(int line)
+{
+ unsigned char *pd = Pico.est.DrawLineDest;
+
if (!(PicoOpt & POPT_DIS_32C_BORDER))
pd += 32;
- for (i = 256/4; i > 0; i--) {
- *pd++ = pal[*ps++];
- *pd++ = pal[*ps++];
- *pd++ = pal[*ps++];
- *pd++ = pal[*ps++];
- }
+ memcpy32((int *)pd, (int *)(Pico.est.HighCol+8), 256/4);
}
-void PicoDrawSetColorFormatMode4(int which)
+void PicoDrawSetOutputMode4(pdso_t which)
{
switch (which)
{
- case 1: FinalizeLineM4 = FinalizeLineRGB555M4; break;
- default:FinalizeLineM4 = NULL; break;
+ case PDF_8BIT: FinalizeLineM4 = FinalizeLine8bitM4; break;
+ case PDF_RGB555: FinalizeLineM4 = FinalizeLineRGB555M4; break;
+ default: FinalizeLineM4 = NULL; break;
}
-#if OVERRIDE_HIGHCOL
- if (which)
- HighCol = DefHighCol;
-#endif
}
notaz.gp2x.de / picodrive.git / blobdiff