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/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
There are only a few differences between the video hardware of Mysterious
Stones and Mat Mania. The tile bank select bit is different and the sprite
selection seems to be different as well. Additionally, the palette is stored
differently. I'm also not sure that the 2nd tile page is really used in
Mysterious Stones.
***************************************************************************/
#include "driver.h"
UINT8 *mystston_videoram2;
static int mystston_fgcolor, mystston_bgpage;
static tilemap *fg_tilemap, *bg_tilemap;
/***************************************************************************
Convert the color PROMs into a more useable format.
Mysterious Stones has both palette RAM and a PROM. The PROM is used for
text.
***************************************************************************/
PALETTE_INIT( mystston )
{
int i;
for (i = 0; i < 32; i++)
{
int bit0, bit1, bit2, r, g, b;
// red component
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// green component
bit0 = (*color_prom >> 3) & 0x01;
bit1 = (*color_prom >> 4) & 0x01;
bit2 = (*color_prom >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// blue component
bit0 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette_set_color(machine, i + 24, MAKE_RGB(r, g, b)); // first 24 colors are from RAM
color_prom++;
}
}
WRITE8_HANDLER( mystston_videoram_w )
{
videoram[offset] = data;
tilemap_mark_tile_dirty(fg_tilemap, offset & 0x3ff);
}
WRITE8_HANDLER( mystston_videoram2_w )
{
mystston_videoram2[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset & 0x1ff);
}
WRITE8_HANDLER( mystston_scroll_w )
{
tilemap_set_scrolly(bg_tilemap, 0, data);
}
WRITE8_HANDLER( mystston_control_w )
{
// bits 0 and 1 are foreground text color
if (mystston_fgcolor != ((data & 0x01) << 1) + ((data & 0x02) >> 1))
{
mystston_fgcolor = ((data & 0x01) << 1) + ((data & 0x02) >> 1);
tilemap_mark_all_tiles_dirty(fg_tilemap);
}
// bit 2 is background page select
mystston_bgpage = (data & 0x04) ? 1:0;
// bits 4 and 5 are coin counters in flipped order
coin_counter_w(0, data & 0x20);
coin_counter_w(1, data & 0x10);
// bit 7 is screen flip
flip_screen_set((data & 0x80) ^ ((readinputport(3) & 0x20) ? 0x80:0));
}
static TILE_GET_INFO( get_bg_tile_info )
{
int code = mystston_videoram2[tile_index] + ((mystston_videoram2[tile_index + 0x200] & 0x01) << 8);
int flags = (tile_index & 0x10) ? TILE_FLIPY : 0;
SET_TILE_INFO(1, code, 0, flags);
}
static TILE_GET_INFO( get_fg_tile_info )
{
int code = videoram[tile_index] + ((videoram[tile_index + 0x400] & 0x07) << 8);
int color = mystston_fgcolor;
SET_TILE_INFO(0, code, color, 0);
}
VIDEO_START( mystston )
{
bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_cols_flip_x,
TILEMAP_TYPE_PEN, 16, 16, 16, 32);
fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_cols_flip_x,
TILEMAP_TYPE_PEN, 8, 8, 32, 32);
tilemap_set_transparent_pen(fg_tilemap, 0);
}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect )
{
int offs;
for (offs = 0; offs < spriteram_size; offs += 4)
{
int attr = spriteram[offs];
if (attr & 0x01)
{
int code = spriteram[offs + 1] + ((attr & 0x10) << 4);
int color = (attr & 0x08) >> 3;
int flipx = attr & 0x04;
int flipy = attr & 0x02;
int sx = 240 - spriteram[offs + 3];
int sy = (240 - spriteram[offs + 2]) & 0xff;
if (flip_screen)
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,machine->gfx[2], code, color, flipx, flipy,
sx, sy, cliprect, TRANSPARENCY_PEN, 0);
}
}
}
VIDEO_UPDATE( mystston )
{
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
draw_sprites(machine, bitmap, cliprect);
tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0);
return 0;
}
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