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AmigActive 10
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AACD 10.iso
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vidhrdw
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mrjong.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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152 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int flipscreen;
/***************************************************************************
Convert the color PROMs. (from vidhrdw/penco.c)
***************************************************************************/
void mrjong_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++;
}
color_prom += 0x10;
/* color_prom now points to the beginning of the lookup table */
/* character lookup table */
/* sprites use the same color lookup table as characters */
for (i = 0; i < TOTAL_COLORS(0); i++)
COLOR(0, i) = *(color_prom++) & 0x0f;
}
/***************************************************************************
Display control parameter.
***************************************************************************/
WRITE_HANDLER( mrjong_flipscreen_w )
{
if (flipscreen != (data & 1))
{
flipscreen = (data & 1);
memset(dirtybuffer, 1, videoram_size);
}
}
/***************************************************************************
Draw the game screen in the given osd_bitmap.
***************************************************************************/
void mrjong_vh_screenrefresh(struct osd_bitmap *bitmap, int full_refresh)
{
int offs;
/* Draw the tiles. */
for (offs = (videoram_size - 1); offs > 0; offs--)
{
if (dirtybuffer[offs])
{
int tile;
int color;
int sx, sy;
int flipx, flipy;
dirtybuffer[offs] = 0;
tile = videoram[offs] | ((colorram[offs] & 0x20) << 3);
flipx = (colorram[offs] & 0x40) >> 6;
flipy = (colorram[offs] & 0x80) >> 7;
color = colorram[offs] & 0x1f;
sx = 31 - (offs % 32);
sy = 31 - (offs / 32);
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap, Machine->gfx[0],
tile,
color,
flipx, flipy,
8*sx, 8*sy,
&Machine->drv->visible_area, TRANSPARENCY_NONE, 0);
}
}
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 sprt;
int color;
int sx, sy;
int flipx, flipy;
sprt = (((spriteram[offs + 1] >> 2) & 0x3f) | ((spriteram[offs + 3] & 0x20) << 1));
flipx = (spriteram[offs + 1] & 0x01) >> 0;
flipy = (spriteram[offs + 1] & 0x02) >> 1;
color = (spriteram[offs + 3] & 0x1f);
sx = 224 - spriteram[offs + 2];
sy = spriteram[offs + 0];
if (flipscreen)
{
sx = 208 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap, Machine->gfx[1],
sprt,
color,
flipx, flipy,
sx, sy,
&Machine->drv->visible_area, TRANSPARENCY_PEN, 0);
}
}