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Haze: attempt to fix MT 4044

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This commit is contained in:
Angelo Salese 2010-09-06 18:58:31 +00:00
parent 17a3a88ada
commit 1f7f4877e4
1 changed files with 27 additions and 2 deletions
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29
src/mame/video/gp9001.c
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@ -128,6 +128,30 @@ Pipi & Bibis | Fix Eight | V-Five | Snow Bros. 2 |
#include "emu.h" #include "emu.h"
#include "gp9001.h" #include "gp9001.h"
/*
Single VDP mixing priority note:
Initial thoughts were that 16 levels of priority exist for both sprites and tilemaps, ie GP9001_PRIMASK 0xf
However the end of level scene rendered on the first VDP in Batsugun strongly suggests otherwise.
Sprites have 'priority' bits of 0x0600 (level 0x6) set
Tilemaps have 'priority' bits of 0x7000 (level 0x7) set
If a mask of 0xf is used then the tilemaps render above the sprites, which causes the V bonus items near the
counters to be invisible (in addition to the English character quote text)
using a mask of 0xe causes both priority levels to be equal, allowing the sprites to render above the tilemap.
The alternative option of allowing sprites to render a priority level higher than tilemaps breaks at least the
'Welcome to..' screen in Batrider after selecting your character.
It is unknown if the current solution breaks anything. The majority of titles don't make extensive use of the
priority system.
*/
#define GP9001_PRIMASK (0x000e)
static WRITE16_DEVICE_HANDLER( gp9001_bg_tilemap_w ) static WRITE16_DEVICE_HANDLER( gp9001_bg_tilemap_w )
{ {
gp9001vdp_device *vdp = (gp9001vdp_device*)device; gp9001vdp_device *vdp = (gp9001vdp_device*)device;
@ -1034,9 +1058,10 @@ void gp9001vdp_device::draw_sprites( running_machine *machine, bitmap_t *bitmap,
int attrib, sprite, color, priority, flipx, flipy, sx, sy; int attrib, sprite, color, priority, flipx, flipy, sx, sy;
int sprite_sizex, sprite_sizey, dim_x, dim_y, sx_base, sy_base; int sprite_sizex, sprite_sizey, dim_x, dim_y, sx_base, sy_base;
int bank, sprite_num; int bank, sprite_num;
UINT16 primask = (GP9001_PRIMASK << 8);
attrib = source[offs]; attrib = source[offs];
priority = primap[((attrib & 0x0f00)>>8)]+1; priority = primap[((attrib & primask)>>8)]+1;
if ((attrib & 0x8000)) if ((attrib & 0x8000))
{ {
@ -1231,7 +1256,7 @@ void gp9001vdp_device::gp9001_draw_custom_tilemap(running_machine* machine, bitm
int realx = (x+scrollx)&0x1ff; int realx = (x+scrollx)&0x1ff;
UINT16 pixdat = srcptr[realx]; UINT16 pixdat = srcptr[realx];
UINT8 pixpri = ((pixdat & 0xf000)>>12); UINT8 pixpri = ((pixdat & (GP9001_PRIMASK<<12))>>12);
if (pri_enable[pixpri]) if (pri_enable[pixpri])
{ {