📄 jackal.c
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/***************************************************************************
vidhrdw.c
Written by Kenneth Lin (kenneth_lin@ai.vancouver.bc.ca)
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *jackal_scrollram,*jackal_videoctrl;
int jackal_vh_start(void)
{
videoram_size = 0x400;
dirtybuffer = 0;
tmpbitmap = 0;
if ((dirtybuffer = malloc(videoram_size)) == 0)
{
return 1;
}
memset(dirtybuffer,1,videoram_size);
if ((tmpbitmap = osd_new_bitmap(Machine->drv->screen_width,Machine->drv->screen_height,Machine->scrbitmap->depth)) == 0)
{
free(dirtybuffer);
return 1;
}
return 0;
}
void jackal_vh_stop(void)
{
free(dirtybuffer);
osd_free_bitmap(tmpbitmap);
dirtybuffer = 0;
tmpbitmap = 0;
}
/***************************************************************************
Draw the game screen in the given osd_bitmap.
Do NOT call osd_update_display() from this function, it will be called by
the main emulation engine.
***************************************************************************/
void jackal_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
unsigned char *sr, *ss;
int offs,i;
unsigned char *RAM = (Machine->memory_region[0]);
if (palette_recalc())
{
memset(dirtybuffer,1,videoram_size);
}
jackal_scrollram = &RAM[0x0020];
colorram = &RAM[0x2000];
videoram = &RAM[0x2400];
spriteram_size = 0x500;
if (jackal_videoctrl[0x03] & 0x08)
{
sr = &RAM[0x03800];
ss = &RAM[0x13800];
}
else
{
sr = &RAM[0x03000];
ss = &RAM[0x13000];
}
/* for every character in the Video RAM, check if it has been modified */
/* since last time and update it accordingly. */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (dirtybuffer[offs])
{
int sx,sy;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs] + ((colorram[offs] & 0xc0) << 2) + ((colorram[offs] & 0x30) << 6),
0,
colorram[offs] & 0x10,colorram[offs] & 0x20,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
{
int h_scroll_num = 0, v_scroll_num = 0;
int h_scroll[32], v_scroll[32];
if (jackal_videoctrl[2] & 0x08)
{
h_scroll_num = 32;
for (i = 0;i < 32;i++)
h_scroll[i] = -(jackal_scrollram[i]);
}
if (jackal_videoctrl[2] & 0x04)
{
v_scroll_num = 32;
for (i = 0;i < 32;i++)
v_scroll[i] = -(jackal_scrollram[i]);
}
if (jackal_videoctrl[0] != 0)
{
v_scroll_num = 1;
v_scroll[0] = -(jackal_videoctrl[0]);
}
if (jackal_videoctrl[1] != 0)
{
h_scroll_num = 1;
h_scroll[0] = -(jackal_videoctrl[1]);
}
if ((h_scroll_num == 0) && (v_scroll_num == 0))
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
else
copyscrollbitmap(bitmap,tmpbitmap,h_scroll_num,h_scroll,v_scroll_num,v_scroll,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* Draw the sprites. */
{
unsigned char sr1, sr2, sr3, sr4, sr5;
int spritenum, sx, sy;
unsigned char sn1, sn2, sp, flipx, flipy;
for ( offs = 0; offs < 0x0F5; /* offs += 5 */ )
{
sn1 = ss[offs++];
sn2 = ss[offs++];
sy = ss[offs++];
sx = ss[offs++];
sp = ss[offs++];
flipx = sp & 0x20;
flipy = sp & 0x40;
if ( !(sp & 0xC) )
{
spritenum = sn1 + ((sn2 & 0x3) << 8);
if (sy > 0xF0) sy = sy - 256;
if (sp & 0x01) sx = sx - 256;
if (sp & 0x10)
{
if ( (sx > -16) || (sx < 0xF0) )
{
drawgfx(bitmap,Machine->gfx[2],
spritenum,
0,
flipx,flipy,
flipx?sx+16:sx, flipy?sy+16:sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[2],
spritenum+1,
0,
flipx,flipy,
flipx?sx:sx+16, flipy?sy+16:sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[2],
spritenum+2,
0,
flipx,flipy,
flipx?sx+16:sx, flipy?sy:sy+16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[2],
spritenum+3,
0,
flipx,flipy,
flipx?sx:sx+16, flipy?sy:sy+16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
else
{
if ( (sx > -8) || (sx < 0xF0) )
{
drawgfx(bitmap,Machine->gfx[2],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
}
else if ( (sx < 0xF0) && !(sp & 0x01) )
{
spritenum = sn1*4 + ((sn2 & (8+4)) >> 2) + ((sn2 & (2+1)) << 10);
if ((sp & 0x0C) == 0x0C)
{
drawgfx(bitmap,Machine->gfx[4],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
if ((sp & 0x0C) == 0x08)
{
drawgfx(bitmap,Machine->gfx[4],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[4],
spritenum - 2,
0,
flipx,flipy,
sx,sy+8,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
if ((sp & 0x0C) == 0x04)
{
drawgfx(bitmap,Machine->gfx[4],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[4],
spritenum + 1,
0,
flipx,flipy,
sx+8,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
}
for (offs = 0; offs < 0x11D; offs += 5)
{
if ( (sr[offs+2] < 0xF0) && !(sr[offs+4] & 0x01) )
{
sr1 = sr[offs];
sr2 = sr[offs+1];
sr3 = sr[offs+2];
sr4 = sr[offs+3];
sr5 = sr[offs+4];
sy = sr3;
sx = sr4;
flipx = sr5 & 0x20;
flipy = sr5 & 0x40;
spritenum = sr1 + ((sr2 & 0x3) << 8);
if (sr5 & 0xC) /* half sized sprite */
{
spritenum = sr1*4 + ((sr2 & (8+4)) >> 2) + ((sr2 & (2+1)) << 10);
if ((sr5 & 0x0C) == 0x0C)
{
drawgfx(bitmap,Machine->gfx[3],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
if ((sr5 & 0x0C) == 0x08)
{
drawgfx(bitmap,Machine->gfx[3],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[3],
spritenum - 2,
0,
flipx,flipy,
sx,sy+8,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
if ((sr5 & 0x0C) == 0x04)
{
drawgfx(bitmap,Machine->gfx[3],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[3],
spritenum + 1,
0,
flipx,flipy,
sx+8,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
else
{
if (sr5 & 0x10)
{
drawgfx(bitmap,Machine->gfx[1],
spritenum,
0,
flipx,flipy,
flipx?sx+16:sx, flipy?sy+16:sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
spritenum+1,
0,
flipx,flipy,
flipx?sx:sx+16, flipy?sy+16:sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
spritenum+2,
0,
flipx,flipy,
flipx?sx+16:sx, flipy?sy:sy+16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
spritenum+3,
0,
flipx,flipy,
flipx?sx:sx+16, flipy?sy:sy+16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
else
drawgfx(bitmap,Machine->gfx[1],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
}
for (offs = 0x4F1; offs >= 0x11D; offs -= 5)
{
if ( (sr[offs+2] < 0xF0) && !(sr[offs+4] & 0x01) )
{
sr1 = sr[offs];
sr2 = sr[offs+1];
sr3 = sr[offs+2];
sr4 = sr[offs+3];
sr5 = sr[offs+4];
sy = sr3;
sx = sr4;
flipx = sr5 & 0x20;
flipy = sr5 & 0x40;
if (sr[offs+4] & 0xC) /* half sized sprite */
{
spritenum = sr1*4 + ((sr2 & (8+4)) >> 2) + ((sr2 & (2+1)) << 10);
if ((sr5 & 0x0C) == 0x0C)
{
drawgfx(bitmap,Machine->gfx[3],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
if ((sr5 & 0x0C) == 0x08)
{
drawgfx(bitmap,Machine->gfx[3],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[3],
spritenum - 2,
0,
flipx,flipy,
sx,sy+8,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
if ((sr5 & 0x0C) == 0x04)
{
drawgfx(bitmap,Machine->gfx[3],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[3],
spritenum + 1,
0,
flipx,flipy,
sx+8,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
else
{
spritenum = sr1 + ((sr2 & 0x3) << 8);
if (sr5 & 0x10)
{
drawgfx(bitmap,Machine->gfx[1],
spritenum,
0,
flipx,flipy,
flipx?sx+16:sx, flipy?sy+16:sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
spritenum+1,
0,
flipx,flipy,
flipx?sx:sx+16, flipy?sy+16:sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
spritenum+2,
0,
flipx,flipy,
flipx?sx+16:sx, flipy?sy:sy+16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
spritenum+3,
0,
flipx,flipy,
flipx?sx:sx+16, flipy?sy:sy+16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
else
drawgfx(bitmap,Machine->gfx[1],
spritenum,
0,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
}
}
}
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