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vidhrdw
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cheekyms.c
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C/C++ Source or Header
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2000-04-04
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5KB
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217 lines
/*************************************************************************
Universal Cheeky Mouse Driver
(c)Lee Taylor May 1998, All rights reserved.
For use only in offical Mame releases.
Not to be distrabuted as part of any commerical work.
***************************************************************************
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int flipscreen = -1;
static int redraw_man = 0;
static int man_scroll = -1;
static int sprites[0x20];
static int char_palette = 0;
void cheekyms_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i,j,bit;
for (i = 0; i < 3; i++)
{
const unsigned char* color_prom_save = color_prom;
/* lower nibble */
for (j = 0;j < Machine->drv->total_colors/6;j++)
{
/* red component */
bit = (color_prom[0] >> 0) & 0x01;
*(palette++) = 0xff * bit;
/* green component */
bit = (color_prom[0] >> 1) & 0x01;
*(palette++) = 0xff * bit;
/* blue component */
bit = (color_prom[0] >> 2) & 0x01;
*(palette++) = 0xff * bit;
color_prom++;
}
color_prom = color_prom_save;
/* upper nibble */
for (j = 0;j < Machine->drv->total_colors/6;j++)
{
/* red component */
bit = (color_prom[0] >> 4) & 0x01;
*(palette++) = 0xff * bit;
/* green component */
bit = (color_prom[0] >> 5) & 0x01;
*(palette++) = 0xff * bit;
/* blue component */
bit = (color_prom[0] >> 6) & 0x01;
*(palette++) = 0xff * bit;
color_prom++;
}
}
}
WRITE_HANDLER( cheekyms_sprite_w )
{
sprites[offset] = data;
}
WRITE_HANDLER( cheekyms_port_40_w )
{
static int last_dac = -1;
/* The lower bits probably trigger sound samples */
if (last_dac != (data & 0x80))
{
last_dac = data & 0x80;
DAC_data_w(0, last_dac ? 0x80 : 0);
}
}
WRITE_HANDLER( cheekyms_port_80_w )
{
int new_man_scroll, new_char_palette, new_flipscreen;
/* Bits 0-1 Sound enables, not sure which bit is which */
/* Bit 2 is interrupt enable */
interrupt_enable_w(offset, data & 0x04);
/* Bit 3-5 Man scroll amount */
new_man_scroll = (data >> 3) & 0x07;
if (man_scroll != new_man_scroll)
{
man_scroll = new_man_scroll;
redraw_man = 1;
}
/* Bit 6 is palette select (Selects either 0 = PROM M8, 1 = PROM M9) */
new_char_palette = (data >> 2) & 0x10;
if (char_palette != new_char_palette)
{
char_palette = new_char_palette;
memset(dirtybuffer, 1, videoram_size);
}
/* Bit 7 is screen flip */
new_flipscreen = (data >> 7) & 0x01;
if (flipscreen != new_flipscreen)
{
flipscreen = new_flipscreen;
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 cheekyms_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
fillbitmap(bitmap,Machine->pens[0],&Machine->drv->visible_area);
/* Draw the sprites first, because they're supposed to appear below
the characters */
for (offs = 0; offs < sizeof(sprites); offs += 4)
{
int v1, sx, sy, col, code;
v1 = sprites[offs + 0];
sy = sprites[offs + 1];
sx = 256 - sprites[offs + 2];
col = (sprites[offs + 3] & 0x07);
if (!(sprites[offs + 3] & 0x08)) continue;
code = (~v1 << 1) & 0x1f;
if (v1 & 0x80)
{
drawgfx(bitmap,Machine->gfx[1],
code + (flipscreen ^ 1),
col,
0,0,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
else
{
drawgfx(bitmap,Machine->gfx[1],
code + 0x20,
col,
0,0,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[1],
code + 0x21,
col,
0,0,
sx + 8*(v1 & 2),sy + 8*(~v1 & 2),
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
/* 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--)
{
int sx,sy,man_area;
sx = offs % 32;
sy = offs / 32;
man_area = ((sy >= (6 - flipscreen)) &&
(sy <= (26 - flipscreen)) &&
(sx >= 8) &&
(sx <= 12));
if (dirtybuffer[offs] ||
(redraw_man && man_area))
{
dirtybuffer[offs] = 0;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs],
0 + char_palette,
flipscreen,flipscreen,
8*sx, 8*sy - (man_area ? man_scroll : 0),
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
redraw_man = 0;
/* copy the temporary bitmap to the screen over the sprites */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_PEN,Machine->pens[4*char_palette]);
}