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vidhrdw
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kingobox.c
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C/C++ Source or Header
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2000-05-04
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8KB
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322 lines
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *kingobox_videoram1;
unsigned char *kingobox_colorram1;
size_t kingobox_videoram1_size;
unsigned char *kingobox_scroll_y;
extern int kingofb_nmi_enable;
static int palette_bank;
/***************************************************************************
Convert the color PROMs into a more useable format.
King of Boxer has three 256x4 palette PROMs, connected to the RGB output
this way:
bit 3 -- 180 ohm resistor -- RED/GREEN/BLUE
-- 360 ohm resistor -- RED/GREEN/BLUE
-- 750 ohm resistor -- RED/GREEN/BLUE
bit 0 -- 1.5kohm resistor -- RED/GREEN/BLUE
The foreground color code directly goes to the RGB output, this way:
bit 5 -- 51 ohm resistor -- RED
bit 4 -- 51 ohm resistor -- GREEN
bit 3 -- 51 ohm resistor -- BLUE
***************************************************************************/
void kingobox_vh_convert_color_prom(unsigned char *palette,unsigned short *colortable,const unsigned char *color_prom)
{
int i;
#define TOTAL_COLORS(gfxn) (Machine->gfx[gfxn]->total_colors * Machine->gfx[gfxn]->color_granularity)
#define COLOR(gfxn,offs) (colortable[Machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
for (i = 0;i < 256;i++)
{
int bit0,bit1,bit2,bit3;
/* red component */
bit0 = (color_prom[0] >> 0) & 0x01;
bit1 = (color_prom[0] >> 1) & 0x01;
bit2 = (color_prom[0] >> 2) & 0x01;
bit3 = (color_prom[0] >> 3) & 0x01;
*(palette++) = 0x10 * bit0 + 0x21 * bit1 + 0x45 * bit2 + 0x89 * bit3;
/* green component */
bit0 = (color_prom[256] >> 0) & 0x01;
bit1 = (color_prom[256] >> 1) & 0x01;
bit2 = (color_prom[256] >> 2) & 0x01;
bit3 = (color_prom[256] >> 3) & 0x01;
*(palette++) = 0x10 * bit0 + 0x21 * bit1 + 0x45 * bit2 + 0x89 * bit3;
/* blue component */
bit0 = (color_prom[2*256] >> 0) & 0x01;
bit1 = (color_prom[2*256] >> 1) & 0x01;
bit2 = (color_prom[2*256] >> 2) & 0x01;
bit3 = (color_prom[2*256] >> 3) & 0x01;
*(palette++) = 0x10 * bit0 + 0x21 * bit1 + 0x45 * bit2 + 0x89 * bit3;
color_prom++;
}
/* the foreground chars directly map to primary colors */
for (i = 0;i < 8;i++)
{
/* red component */
*(palette++) = 0xff * ((i >> 2) & 0x01);
/* green component */
*(palette++) = 0xff * ((i >> 1) & 0x01);
/* blue component */
*(palette++) = 0xff * ((i >> 0) & 0x01);
}
for (i = 0;i < TOTAL_COLORS(0)/2;i++)
{
COLOR(0,2*i+0) = 0; /* transparent */
COLOR(0,2*i+1) = 256 + i;
}
}
/* Ring King has one 256x8 PROM instead of two 256x4 */
void ringking_vh_convert_color_prom(unsigned char *palette,unsigned short *colortable,const unsigned char *color_prom)
{
int i;
#define TOTAL_COLORS(gfxn) (Machine->gfx[gfxn]->total_colors * Machine->gfx[gfxn]->color_granularity)
#define COLOR(gfxn,offs) (colortable[Machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
for (i = 0;i < 256;i++)
{
int bit0,bit1,bit2,bit3;
/* red component */
bit0 = (color_prom[0] >> 4) & 0x01;
bit1 = (color_prom[0] >> 5) & 0x01;
bit2 = (color_prom[0] >> 6) & 0x01;
bit3 = (color_prom[0] >> 7) & 0x01;
*(palette++) = 0x10 * bit0 + 0x21 * bit1 + 0x45 * bit2 + 0x89 * bit3;
/* green component */
bit0 = (color_prom[0] >> 0) & 0x01;
bit1 = (color_prom[0] >> 1) & 0x01;
bit2 = (color_prom[0] >> 2) & 0x01;
bit3 = (color_prom[0] >> 3) & 0x01;
*(palette++) = 0x10 * bit0 + 0x21 * bit1 + 0x45 * bit2 + 0x89 * bit3;
/* blue component */
bit0 = (color_prom[256] >> 0) & 0x01;
bit1 = (color_prom[256] >> 1) & 0x01;
bit2 = (color_prom[256] >> 2) & 0x01;
bit3 = (color_prom[256] >> 3) & 0x01;
*(palette++) = 0x10 * bit0 + 0x21 * bit1 + 0x45 * bit2 + 0x89 * bit3;
color_prom++;
}
/* the foreground chars directly map to primary colors */
for (i = 0;i < 8;i++)
{
/* red component */
*(palette++) = 0xff * ((i >> 2) & 0x01);
/* green component */
*(palette++) = 0xff * ((i >> 1) & 0x01);
/* blue component */
*(palette++) = 0xff * ((i >> 0) & 0x01);
}
for (i = 0;i < TOTAL_COLORS(0)/2;i++)
{
COLOR(0,2*i+0) = 0; /* transparent */
COLOR(0,2*i+1) = 256 + i;
}
}
WRITE_HANDLER( kingofb_f800_w )
{
kingofb_nmi_enable = data & 0x20;
if (palette_bank != ((data & 0x18) >> 3))
{
palette_bank = (data & 0x18) >> 3;
memset(dirtybuffer,1,videoram_size);
}
}
void kingobox_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
/* background */
/* 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,code,bank;
sx = offs / 16;
sy = 15 - offs % 16;
dirtybuffer[offs] = 0;
code = videoram[offs] + ((colorram[offs] & 0x03) << 8);
bank = (colorram[offs] & 0x04) >> 2;
drawgfx(tmpbitmap,Machine->gfx[2 + bank],
code,
((colorram[offs] & 0x70) >> 4) + 8 * palette_bank,
0,0,
sx*16,sy*16,
0,TRANSPARENCY_NONE,0);
}
}
{
int scrolly = kingobox_scroll_y[0];
copyscrollbitmap(bitmap,tmpbitmap,0,0,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* sprites */
for (offs = spriteram_size - 4;offs >= 0;offs -= 4)
{
int sx,sy,code,color,bank,flipy;
sx = spriteram[offs+1];
sy = spriteram[offs];
code = spriteram[offs + 2] + ((spriteram[offs + 3] & 0x03) << 8);
bank = (spriteram[offs + 3] & 0x04) >> 2;
color = ((spriteram[offs + 3] & 0x70) >> 4) + 8 * palette_bank,
flipy = spriteram[offs + 3] & 0x80;
drawgfx(bitmap,Machine->gfx[2 + bank],
code,
color,
0,flipy,
sx,sy,
0,TRANSPARENCY_PEN,0);
}
/* foreground */
for (offs = kingobox_videoram1_size - 1;offs >= 0;offs--)
{
int sx,sy,code,bank;
sx = offs / 32;
sy = 31 - offs % 32;
code = kingobox_videoram1[offs] + ((kingobox_colorram1[offs] & 0x01) << 8);
bank = (kingobox_colorram1[offs] & 0x02) >> 1;
drawgfx(bitmap,Machine->gfx[bank],
code,
(kingobox_colorram1[offs] & 0x38) >> 3,
0,0,
sx*8,sy*8,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void ringking_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
/* background */
/* 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;
sx = offs / 16;
sy = 15 - offs % 16;
dirtybuffer[offs] = 0;
drawgfx(tmpbitmap,Machine->gfx[4],
videoram[offs],
((colorram[offs] & 0x70) >> 4 ) + 8 * palette_bank,
0,0,
sx*16,sy*16,
0,TRANSPARENCY_NONE,0);
}
}
{
int scrolly = kingobox_scroll_y[0];
copyscrollbitmap(bitmap,tmpbitmap,0,0,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* sprites */
for (offs = 0; offs < spriteram_size;offs += 4)
{
int sx,sy,code,color,bank,flipy;
sx = spriteram[offs+2];
sy = spriteram[offs];
code = spriteram[offs + 3] + ((spriteram[offs + 1] & 0x03) << 8);
bank = (spriteram[offs + 1] & 0x04) >> 2;
color = ((spriteram[offs + 1] & 0x70) >> 4) + 8 * palette_bank,
flipy = ( spriteram[offs + 1] & 0x80 ) ? 0 : 1;
drawgfx(bitmap,Machine->gfx[2 + bank],
code,
color,
0,flipy,
sx,sy,
0,TRANSPARENCY_PEN,0);
}
/* foreground */
for (offs = kingobox_videoram1_size - 1;offs >= 0;offs--)
{
int sx,sy,code,bank;
sx = offs / 32;
sy = 31 - offs % 32;
code = kingobox_videoram1[offs] + ((kingobox_colorram1[offs] & 0x01) << 8);
bank = (kingobox_colorram1[offs] & 0x02) >> 1;
drawgfx(bitmap,Machine->gfx[bank],
code,
(kingobox_colorram1[offs] & 0x38) >> 3,
0,0,
sx*8,sy*8,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}