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AmigActive 10
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AACD 10.iso
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vidhrdw
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bagman.c
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C/C++ Source or Header
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2000-04-04
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4KB
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166 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *bagman_video_enable;
static int flipscreen[2];
/***************************************************************************
Convert the color PROMs into a more useable format.
Bagman has two 32 bytes palette PROMs, connected to the RGB output this
way:
bit 7 -- 220 ohm resistor -- BLUE
-- 470 ohm resistor -- BLUE
-- 220 ohm resistor -- GREEN
-- 470 ohm resistor -- GREEN
-- 1 kohm resistor -- GREEN
-- 220 ohm resistor -- RED
-- 470 ohm resistor -- RED
bit 0 -- 1 kohm resistor -- RED
***************************************************************************/
void bagman_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 < Machine->drv->total_colors;i++)
{
int bit0,bit1,bit2;
/* red component */
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 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 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
color_prom++;
}
}
WRITE_HANDLER( bagman_flipscreen_w )
{
if ((data & 1) != flipscreen[offset])
{
flipscreen[offset] = data & 1;
memset(dirtybuffer,1,videoram_size);
}
}
/***************************************************************************
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 bagman_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
if (*bagman_video_enable == 0)
{
fillbitmap(bitmap,Machine->pens[0],&Machine->drv->visible_area);
return;
}
/* 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;
int bank;
dirtybuffer[offs] = 0;
sx = offs % 32;
if (flipscreen[0]) sx = 31 - sx;
sy = offs / 32;
if (flipscreen[1]) sy = 31 - sy;
/* Pickin' doesn't have the second char bank */
bank = 0;
if (Machine->gfx[2] && (colorram[offs] & 0x10)) bank = 2;
drawgfx(tmpbitmap,Machine->gfx[bank],
videoram[offs] + 8 * (colorram[offs] & 0x20),
colorram[offs] & 0x0f,
flipscreen[0],flipscreen[1],
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the character mapped graphics */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* Draw the sprites. */
for (offs = spriteram_size - 4;offs >= 0;offs -= 4)
{
int sx,sy,flipx,flipy;
sx = spriteram[offs + 3];
sy = 240 - spriteram[offs + 2];
flipx = spriteram[offs] & 0x40;
flipy = spriteram[offs] & 0x80;
if (flipscreen[0])
{
sx = 240 - sx +1; /* compensate misplacement */
flipx = !flipx;
}
if (flipscreen[1])
{
sy = 240 - sy;
flipy = !flipy;
}
if (spriteram[offs + 2] && spriteram[offs + 3])
drawgfx(bitmap,Machine->gfx[1],
(spriteram[offs] & 0x3f) + 2 * (spriteram[offs + 1] & 0x20),
spriteram[offs + 1] & 0x1f,
flipx,flipy,
sx,sy+1, /* compensate misplacement */
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}