diff options
Diffstat (limited to 'src/mame/video/simpl156.c')
-rw-r--r-- | src/mame/video/simpl156.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/mame/video/simpl156.c b/src/mame/video/simpl156.c new file mode 100644 index 00000000000..48ad5f4cb33 --- /dev/null +++ b/src/mame/video/simpl156.c @@ -0,0 +1,156 @@ +/* Simple 156 based board + +*/ + +#include "driver.h" +#include "deco16ic.h" + +/* + +offs +0 +-------- -------- + fFb ssy yyyyyyyy + +s = size (multipart) +f = flipy +b = flash +F = flipx +y = ypos + +offs +1 +-------- -------- +tttttttt tttttttt + +t = sprite tile + +offs +2 +-------- -------- +ppcccccx xxxxxxxx + +c = colour palette +p = priority +x = xpos + +*/ + +/* spriteram is really 16-bit.. this can be changed to use 16-bit ram like the tilemaps + its the same sprite chip Data East used on many, many 16-bit era titles */ +static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect) +{ + int offs; + + flip_screen = 1; + + for (offs = (0x1400/4)-4;offs >= 0;offs -= 4) // 0x1400 for charlien + { + int x,y,sprite,colour,multi,fx,fy,inc,flash,mult, pri; + + sprite = spriteram32[offs+1]&0xffff; + + y = spriteram32[offs]&0xffff; + flash=y&0x1000; + if (flash && (cpu_getcurrentframe() & 1)) continue; + + x = spriteram32[offs+2]&0xffff; + colour = (x >>9) & 0x1f; + + pri = (x&0xc000); // 2 bits or 1? + + switch (pri&0xc000) { + case 0x0000: pri=0; break; + case 0x4000: pri=0xf0; break; + case 0x8000: pri=0xf0|0xcc; break; + case 0xc000: pri=0xf0|0xcc; break; /* or 0xf0|0xcc|0xaa ? */ + } + + fx = y & 0x2000; + fy = y & 0x4000; + multi = (1 << ((y & 0x0600) >> 9)) - 1; /* 1x, 2x, 4x, 8x height */ + + x = x & 0x01ff; + y = y & 0x01ff; + if (x >= 320) x -= 512; + if (y >= 256) y -= 512; + y = 240 - y; + x = 304 - x; + + if (x>320) continue; + + sprite &= ~multi; + if (fy) + inc = -1; + else + { + sprite += multi; + inc = 1; + } + + if (flip_screen) + { + y=240-y; + x=304-x; + if (fx) fx=0; else fx=1; + if (fy) fy=0; else fy=1; + mult=16; + } + else mult=-16; + + while (multi >= 0) + { + pdrawgfx(bitmap,machine->gfx[2], + sprite - multi * inc, + colour, + fx,fy, + x,y + mult * multi, + cliprect,TRANSPARENCY_PEN,0,pri); + + multi--; + } + } +} + + +VIDEO_UPDATE( simpl156 ) +{ + fillbitmap(priority_bitmap,0,NULL); + + deco16_pf12_update(deco16_pf1_rowscroll,deco16_pf2_rowscroll); + + fillbitmap(bitmap,machine->pens[256],cliprect); + + deco16_tilemap_2_draw(bitmap,cliprect,0,2); + deco16_tilemap_1_draw(bitmap,cliprect,0,4); + + draw_sprites(machine, bitmap,cliprect); + return 0; +} + +static int simpl156_bank_callback(const int bank) +{ + return ((bank>>4)&0x7) * 0x1000; +} + + +VIDEO_START( simpl156 ) +{ + /* allocate the ram as 16-bit (we do it here because the CPU is 32-bit) */ + deco16_pf1_data = auto_malloc(0x2000); + deco16_pf2_data = auto_malloc(0x2000); + deco16_pf1_rowscroll = auto_malloc(0x800); + deco16_pf2_rowscroll = auto_malloc(0x800); + deco16_pf12_control = auto_malloc(0x10); + paletteram16 = auto_malloc(0x1000); + + /* and register the allocated ram so that save states still work */ + state_save_register_global_pointer(deco16_pf1_data, 0x2000/2); + state_save_register_global_pointer(deco16_pf2_data, 0x2000/2); + state_save_register_global_pointer(deco16_pf1_rowscroll, 0x800/2); + state_save_register_global_pointer(deco16_pf2_rowscroll, 0x800/2); + state_save_register_global_pointer(deco16_pf12_control, 0x10/2); + state_save_register_global_pointer(paletteram16, 0x1000/2); + + deco16_1_video_init(); + + deco16_set_tilemap_bank_callback(0, simpl156_bank_callback); + deco16_set_tilemap_bank_callback(1, simpl156_bank_callback); +} |