pico/32x/draw.c

   1 /*
   2  * PicoDrive
   3  * (C) notaz, 2009,2010
   4  *
   5  * This work is licensed under the terms of MAME license.
   6  * See COPYING file in the top-level directory.
   7  */
   8 #include "../pico_int.h"
   9
  10 int (*PicoScan32xBegin)(unsigned int num);
  11 int (*PicoScan32xEnd)(unsigned int num);
  12 int Pico32xDrawMode;
  13
  14 static void convert_pal555(int invert_prio)
  15 {
  16   unsigned int *ps = (void *)Pico32xMem->pal;
  17   unsigned int *pd = (void *)Pico32xMem->pal_native;
  18   unsigned int m1 = 0x001f001f;
  19   unsigned int m2 = 0x03e003e0;
  20   unsigned int m3 = 0xfc00fc00;
  21   unsigned int inv = 0;
  22   int i;
  23
  24   if (invert_prio)
  25     inv = 0x00200020;
  26
  27   // place prio to LS green bit
  28   for (i = 0x100/2; i > 0; i--, ps++, pd++) {
  29     unsigned int t = *ps;
  30     *pd = (((t & m1) << 11) | ((t & m2) << 1) | ((t & m3) >> 10)) ^ inv;
  31   }
  32
  33   Pico32x.dirty_pal = 0;
  34 }
  35
  36 // direct color mode
  37 #define do_line_dc(pd, p32x, pmd, inv, pmd_draw_code)             \
  38 {                                                                 \
  39   const unsigned int m1 = 0x001f;                                 \
  40   const unsigned int m2 = 0x03e0;                                 \
  41   const unsigned int m3 = 0x7c00;                                 \
  42   int i;                                                          \
  43                                                                   \
  44   for (i = 320; i > 0; i--, pd++, p32x++, pmd++) {                \
  45     unsigned short t = *p32x;                                     \
  46     if ((*pmd & 0x3f) != mdbg && !((t ^ inv) & 0x8000)) {         \
  47       pmd_draw_code;                                              \
  48       continue;                                                   \
  49     }                                                             \
  50                                                                   \
  51     *pd = ((t & m1) << 11) | ((t & m2) << 1) | ((t & m3) >> 10);  \
  52   }                                                               \
  53 }
  54
  55 // packed pixel mode
  56 #define do_line_pp(pd, p32x, pmd, pmd_draw_code)                  \
  57 {                                                                 \
  58   unsigned short t;                                               \
  59   int i;                                                          \
  60   for (i = 320; i > 0; i--, pd++, p32x++, pmd++) {                \
  61     t = pal[*(unsigned char *)((long)p32x ^ 1)];                  \
  62     if ((t & 0x20) || (*pmd & 0x3f) == mdbg)                      \
  63       *pd = t;                                                    \
  64     else                                                          \
  65       pmd_draw_code;                                              \
  66   }                                                               \
  67 }
  68
  69 // run length mode
  70 #define do_line_rl(pd, p32x, pmd, pmd_draw_code)                  \
  71 {                                                                 \
  72   unsigned short len, t;                                          \
  73   int i;                                                          \
  74   for (i = 320; i > 0; p32x++) {                                  \
  75     t = pal[*p32x & 0xff];                                        \
  76     for (len = (*p32x >> 8) + 1; len > 0 && i > 0; len--, i--, pd++, pmd++) { \
  77       if ((*pmd & 0x3f) == mdbg || (t & 0x20))                    \
  78         *pd = t;                                                  \
  79       else                                                        \
  80         pmd_draw_code;                                            \
  81     }                                                             \
  82   }                                                               \
  83 }
  84
  85 // this is almost never used (Wiz and menu bg gen only)
  86 void FinalizeLine32xRGB555(int sh, int line, struct PicoEState *est)
  87 {
  88   unsigned short *pd = est->DrawLineDest;
  89   unsigned short *pal = Pico32xMem->pal_native;
  90   unsigned char  *pmd = est->HighCol + 8;
  91   unsigned short *dram, *p32x;
  92   unsigned char   mdbg;
  93
  94   FinalizeLine555(sh, line, est);
  95
  96   if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 0 || // 32x blanking
  97       // XXX: how is 32col mode hadled by real hardware?
  98       !(Pico.video.reg[12] & 1) || // 32col mode
  99       !(PicoDrawMask & PDRAW_32X_ON))
 100   {
 101     return;
 102   }
 103
 104   dram = (void *)Pico32xMem->dram[Pico32x.vdp_regs[0x0a/2] & P32XV_FS];
 105   p32x = dram + dram[line];
 106   mdbg = Pico.video.reg[7] & 0x3f;
 107
 108   if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 2) { // Direct Color Mode
 109     int inv_bit = (Pico32x.vdp_regs[0] & P32XV_PRI) ? 0x8000 : 0;
 110     do_line_dc(pd, p32x, pmd, inv_bit,);
 111     return;
 112   }
 113
 114   if (Pico32x.dirty_pal)
 115     convert_pal555(Pico32x.vdp_regs[0] & P32XV_PRI);
 116
 117   if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 1) { // Packed Pixel Mode
 118     unsigned char *p32xb = (void *)p32x;
 119     if (Pico32x.vdp_regs[2 / 2] & P32XV_SFT)
 120       p32xb++;
 121     do_line_pp(pd, p32xb, pmd,);
 122   }
 123   else { // Run Length Mode
 124     do_line_rl(pd, p32x, pmd,);
 125   }
 126 }
 127
 128 #define MD_LAYER_CODE \
 129   *dst = palmd[*pmd]
 130
 131 #define PICOSCAN_PRE \
 132   PicoScan32xBegin(l + (lines_sft_offs & 0xff)); \
 133   dst = Pico.est.DrawLineDest; \
 134
 135 #define PICOSCAN_POST \
 136   PicoScan32xEnd(l + (lines_sft_offs & 0xff)); \
 137
 138 #define make_do_loop(name, pre_code, post_code, md_code)        \
 139 /* Direct Color Mode */                                         \
 140 static void do_loop_dc##name(unsigned short *dst,               \
 141     unsigned short *dram, int lines_sft_offs, int mdbg)         \
 142 {                                                               \
 143   int inv_bit = (Pico32x.vdp_regs[0] & P32XV_PRI) ? 0x8000 : 0; \
 144   unsigned char  *pmd = Pico.est.Draw2FB +                      \
 145                           328 * (lines_sft_offs & 0xff) + 8;    \
 146   unsigned short *palmd = Pico.est.HighPal;                     \
 147   unsigned short *p32x;                                         \
 148   int lines = lines_sft_offs >> 16;                             \
 149   int l;                                                        \
 150   (void)palmd;                                                  \
 151   for (l = 0; l < lines; l++, pmd += 8) {                       \
 152     pre_code;                                                   \
 153     p32x = dram + dram[l];                                      \
 154     do_line_dc(dst, p32x, pmd, inv_bit, md_code);               \
 155     post_code;                                                  \
 156   }                                                             \
 157 }                                                               \
 158                                                                 \
 159 /* Packed Pixel Mode */                                         \
 160 static void do_loop_pp##name(unsigned short *dst,               \
 161     unsigned short *dram, int lines_sft_offs, int mdbg)         \
 162 {                                                               \
 163   unsigned short *pal = Pico32xMem->pal_native;                 \
 164   unsigned char  *pmd = Pico.est.Draw2FB +                      \
 165                           328 * (lines_sft_offs & 0xff) + 8;    \
 166   unsigned short *palmd = Pico.est.HighPal;                     \
 167   unsigned char  *p32x;                                         \
 168   int lines = lines_sft_offs >> 16;                             \
 169   int l;                                                        \
 170   (void)palmd;                                                  \
 171   for (l = 0; l < lines; l++, pmd += 8) {                       \
 172     pre_code;                                                   \
 173     p32x = (void *)(dram + dram[l]);                            \
 174     p32x += (lines_sft_offs >> 8) & 1;                          \
 175     do_line_pp(dst, p32x, pmd, md_code);                        \
 176     post_code;                                                  \
 177   }                                                             \
 178 }                                                               \
 179                                                                 \
 180 /* Run Length Mode */                                           \
 181 static void do_loop_rl##name(unsigned short *dst,               \
 182     unsigned short *dram, int lines_sft_offs, int mdbg)         \
 183 {                                                               \
 184   unsigned short *pal = Pico32xMem->pal_native;                 \
 185   unsigned char  *pmd = Pico.est.Draw2FB +                      \
 186                           328 * (lines_sft_offs & 0xff) + 8;    \
 187   unsigned short *palmd = Pico.est.HighPal;                     \
 188   unsigned short *p32x;                                         \
 189   int lines = lines_sft_offs >> 16;                             \
 190   int l;                                                        \
 191   (void)palmd;                                                  \
 192   for (l = 0; l < lines; l++, pmd += 8) {                       \
 193     pre_code;                                                   \
 194     p32x = dram + dram[l];                                      \
 195     do_line_rl(dst, p32x, pmd, md_code);                        \
 196     post_code;                                                  \
 197   }                                                             \
 198 }
 199
 200 #ifdef _ASM_32X_DRAW
 201 #undef make_do_loop
 202 #define make_do_loop(name, pre_code, post_code, md_code) \
 203 extern void do_loop_dc##name(unsigned short *dst,        \
 204     unsigned short *dram, int lines_offs, int mdbg);     \
 205 extern void do_loop_pp##name(unsigned short *dst,        \
 206     unsigned short *dram, int lines_offs, int mdbg);     \
 207 extern void do_loop_rl##name(unsigned short *dst,        \
 208     unsigned short *dram, int lines_offs, int mdbg);
 209 #endif
 210
 211 make_do_loop(,,,)
 212 make_do_loop(_md, , , MD_LAYER_CODE)
 213 make_do_loop(_scan, PICOSCAN_PRE, PICOSCAN_POST, )
 214 make_do_loop(_scan_md, PICOSCAN_PRE, PICOSCAN_POST, MD_LAYER_CODE)
 215
 216 typedef void (*do_loop_func)(unsigned short *dst, unsigned short *dram, int lines, int mdbg);
 217 enum { DO_LOOP, DO_LOOP_MD, DO_LOOP_SCAN, DO_LOOP_MD_SCAN };
 218
 219 static const do_loop_func do_loop_dc_f[] = { do_loop_dc, do_loop_dc_md, do_loop_dc_scan, do_loop_dc_scan_md };
 220 static const do_loop_func do_loop_pp_f[] = { do_loop_pp, do_loop_pp_md, do_loop_pp_scan, do_loop_pp_scan_md };
 221 static const do_loop_func do_loop_rl_f[] = { do_loop_rl, do_loop_rl_md, do_loop_rl_scan, do_loop_rl_scan_md };
 222
 223 void PicoDraw32xLayer(int offs, int lines, int md_bg)
 224 {
 225   int have_scan = PicoScan32xBegin != NULL && PicoScan32xEnd != NULL;
 226   const do_loop_func *do_loop;
 227   unsigned short *dram;
 228   int lines_sft_offs;
 229   int which_func;
 230
 231   Pico.est.DrawLineDest = (char *)DrawLineDestBase + offs * DrawLineDestIncrement;
 232   dram = Pico32xMem->dram[Pico32x.vdp_regs[0x0a/2] & P32XV_FS];
 233
 234   if (Pico32xDrawMode == PDM32X_BOTH) {
 235     if (Pico.m.dirtyPal)
 236       PicoDrawUpdateHighPal();
 237   }
 238
 239   if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 2)
 240   {
 241     // Direct Color Mode
 242     do_loop = do_loop_dc_f;
 243     goto do_it;
 244   }
 245
 246   if (Pico32x.dirty_pal)
 247     convert_pal555(Pico32x.vdp_regs[0] & P32XV_PRI);
 248
 249   if ((Pico32x.vdp_regs[0] & P32XV_Mx) == 1)
 250   {
 251     // Packed Pixel Mode
 252     do_loop = do_loop_pp_f;
 253   }
 254   else
 255   {
 256     // Run Length Mode
 257     do_loop = do_loop_rl_f;
 258   }
 259
 260 do_it:
 261   if (Pico32xDrawMode == PDM32X_BOTH)
 262     which_func = have_scan ? DO_LOOP_MD_SCAN : DO_LOOP_MD;
 263   else
 264     which_func = have_scan ? DO_LOOP_SCAN : DO_LOOP;
 265   lines_sft_offs = (lines << 16) | offs;
 266   if (Pico32x.vdp_regs[2 / 2] & P32XV_SFT)
 267     lines_sft_offs |= 1 << 8;
 268
 269   do_loop[which_func](Pico.est.DrawLineDest, dram, lines_sft_offs, md_bg);
 270 }
 271
 272 // mostly unused, games tend to keep 32X layer on
 273 void PicoDraw32xLayerMdOnly(int offs, int lines)
 274 {
 275   int have_scan = PicoScan32xBegin != NULL && PicoScan32xEnd != NULL;
 276   unsigned short *dst = (void *)((char *)DrawLineDestBase + offs * DrawLineDestIncrement);
 277   unsigned char  *pmd = Pico.est.Draw2FB + 328 * offs + 8;
 278   unsigned short *pal = Pico.est.HighPal;
 279   int poffs = 0, plen = 320;
 280   int l, p;
 281
 282   if (!(Pico.video.reg[12] & 1)) {
 283     // 32col mode
 284     poffs = 32;
 285     plen = 256;
 286   }
 287
 288   if (Pico.m.dirtyPal)
 289     PicoDrawUpdateHighPal();
 290
 291   dst += poffs;
 292   for (l = 0; l < lines; l++) {
 293     if (have_scan) {
 294       PicoScan32xBegin(l + offs);
 295       dst = Pico.est.DrawLineDest + poffs;
 296     }
 297     for (p = 0; p < plen; p += 4) {
 298       dst[p + 0] = pal[*pmd++];
 299       dst[p + 1] = pal[*pmd++];
 300       dst[p + 2] = pal[*pmd++];
 301       dst[p + 3] = pal[*pmd++];
 302     }
 303     dst = (void *)((char *)dst + DrawLineDestIncrement);
 304     pmd += 328 - plen;
 305     if (have_scan)
 306       PicoScan32xEnd(l + offs);
 307   }
 308 }
 309
 310 void PicoDrawSetOutFormat32x(pdso_t which, int use_32x_line_mode)
 311 {
 312 #ifdef _ASM_32X_DRAW
 313   extern void *Pico32xNativePal;
 314   Pico32xNativePal = Pico32xMem->pal_native;
 315 #endif
 316
 317   if (which == PDF_RGB555 && use_32x_line_mode) {
 318     // we'll draw via FinalizeLine32xRGB555 (rare)
 319     PicoDrawSetInternalBuf(NULL, 0);
 320     Pico32xDrawMode = PDM32X_OFF;
 321     return;
 322   }
 323
 324   // use the same layout as alt renderer
 325   PicoDrawSetInternalBuf(Pico.est.Draw2FB, 328);
 326   Pico32xDrawMode = (which == PDF_RGB555) ? PDM32X_32X_ONLY : PDM32X_BOTH;
 327 }
 328
 329 // vim:shiftwidth=2:ts=2:expandtab