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vidhrdw
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troangel.c
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C/C++ Source or Header
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2000-04-04
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6KB
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237 lines
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *troangel_scroll;
static int flipscreen;
/***************************************************************************
Convert the color PROMs into a more useable format.
Tropical Angel has two 256x4 character palette PROMs, one 32x8 sprite
palette PROM, and one 256x4 sprite color lookup table PROM.
I don't know for sure how the palette PROMs are connected to the RGB
output, but it's probably something like this; note that RED and BLUE
are swapped wrt the usual configuration.
bit 7 -- 220 ohm resistor -- RED
-- 470 ohm resistor -- RED
-- 220 ohm resistor -- GREEN
-- 470 ohm resistor -- GREEN
-- 1 kohm resistor -- GREEN
-- 220 ohm resistor -- BLUE
-- 470 ohm resistor -- BLUE
bit 0 -- 1 kohm resistor -- BLUE
***************************************************************************/
void troangel_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])
/* character palette */
for (i = 0;i < 256;i++)
{
int bit0,bit1,bit2;
/* red component */
bit0 = 0;
bit1 = (color_prom[256] >> 2) & 0x01;
bit2 = (color_prom[256] >> 3) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[0] >> 3) & 0x01;
bit1 = (color_prom[256] >> 0) & 0x01;
bit2 = (color_prom[256] >> 1) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = (color_prom[0] >> 0) & 0x01;
bit1 = (color_prom[0] >> 1) & 0x01;
bit2 = (color_prom[0] >> 2) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
COLOR(0,i) = i;
color_prom++;
}
color_prom += 256;
/* color_prom now points to the beginning of the sprite palette */
/* sprite palette */
for (i = 0;i < 16;i++)
{
int bit0,bit1,bit2;
/* red component */
bit0 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (*color_prom >> 3) & 0x01;
bit1 = (*color_prom >> 4) & 0x01;
bit2 = (*color_prom >> 5) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
color_prom++;
}
color_prom += 16;
/* color_prom now points to the beginning of the sprite lookup table */
/* sprite lookup table */
for (i = 0;i < TOTAL_COLORS(1);i++)
{
COLOR(1,i) = 256 + (~*color_prom & 0x0f);
color_prom++;
}
}
WRITE_HANDLER( troangel_flipscreen_w )
{
/* screen flip is handled both by software and hardware */
data ^= ~readinputport(4) & 1;
if (flipscreen != (data & 1))
{
flipscreen = data & 1;
memset(dirtybuffer,1,videoram_size);
}
coin_counter_w(0,data & 0x02);
coin_counter_w(1,data & 0x20);
}
static void draw_background( struct osd_bitmap *bitmap )
{
int offs;
const struct GfxElement *gfx = Machine->gfx[0];
for (offs = videoram_size - 2;offs >= 0;offs -= 2)
{
if (dirtybuffer[offs] || dirtybuffer[offs+1])
{
int sx,sy,code,attr,flipx;
dirtybuffer[offs] = dirtybuffer[offs+1] = 0;
sx = (offs/2) % 32;
sy = (offs/2) / 32;
attr = videoram[offs];
code = videoram[offs+1] + ((attr & 0xc0) << 2);
flipx = attr & 0x20;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipx = !flipx;
}
drawgfx(tmpbitmap,gfx,
code,
attr & 0x1f,
flipx,flipscreen,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
{
int xscroll[256];
if (flipscreen)
{
/* fixed */
for (offs = 0;offs < 64;offs++) xscroll[255-offs] = 0;
/* scroll (wraps around) */
for (offs = 64;offs < 128;offs++) xscroll[255-offs] = troangel_scroll[64];
/* linescroll (no wrap) */
for (offs = 128;offs < 256;offs++) xscroll[255-offs] = troangel_scroll[offs];
}
else
{
/* fixed */
for (offs = 0;offs < 64;offs++) xscroll[offs] = 0;
/* scroll (wraps around) */
for (offs = 64;offs < 128;offs++) xscroll[offs] = -troangel_scroll[64];
/* linescroll (no wrap) */
for (offs = 128;offs < 256;offs++) xscroll[offs] = -troangel_scroll[offs];
}
copyscrollbitmap(bitmap,tmpbitmap,256,xscroll,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
static void draw_sprites( struct osd_bitmap *bitmap )
{
int offs;
for (offs = spriteram_size-4;offs >= 0;offs -= 4)
{
unsigned char attributes = spriteram[offs+1];
int sx = spriteram[offs+3];
int sy = ((224-spriteram[offs+0]-32)&0xff)+32;
int code = spriteram[offs+2];
int color = attributes&0x1f;
int flipy = attributes&0x80;
int flipx = attributes&0x40;
int tile_number = code & 0x3f;
int bank = 0;
if( code&0x80 ) bank += 1;
if( attributes&0x20 ) bank += 2;
if (flipscreen)
{
sx = 240 - sx;
sy = 224 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,Machine->gfx[1+bank],
tile_number,
color,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void troangel_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
draw_background(bitmap);
draw_sprites(bitmap);
}