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AmigActive 10
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AACD 10.iso
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vidhrdw
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hexa.c
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C/C++ Source or Header
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2000-04-04
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/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int charbank;
static int flipx,flipy;
void hexa_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i;
for (i = 0;i < Machine->drv->total_colors;i++)
{
int bit0,bit1,bit2,bit3;
bit0 = (color_prom[0] >> 0) & 0x01;
bit1 = (color_prom[0] >> 1) & 0x01;
bit2 = (color_prom[0] >> 2) & 0x01;
bit3 = (color_prom[0] >> 3) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
bit0 = (color_prom[Machine->drv->total_colors] >> 0) & 0x01;
bit1 = (color_prom[Machine->drv->total_colors] >> 1) & 0x01;
bit2 = (color_prom[Machine->drv->total_colors] >> 2) & 0x01;
bit3 = (color_prom[Machine->drv->total_colors] >> 3) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
bit0 = (color_prom[2*Machine->drv->total_colors] >> 0) & 0x01;
bit1 = (color_prom[2*Machine->drv->total_colors] >> 1) & 0x01;
bit2 = (color_prom[2*Machine->drv->total_colors] >> 2) & 0x01;
bit3 = (color_prom[2*Machine->drv->total_colors] >> 3) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
color_prom++;
}
}
WRITE_HANDLER( hexa_d008_w )
{
int bankaddress;
unsigned char *RAM = memory_region(REGION_CPU1);
/* bit 0 = flipx (or y?) */
if (flipx != (data & 0x01))
{
flipx = data & 0x01;
memset(dirtybuffer,1,videoram_size);
}
/* bit 1 = flipy (or x?) */
if (flipy != (data & 0x02))
{
flipy = data & 0x02;
memset(dirtybuffer,1,videoram_size);
}
/* bit 2 - 3 unknown */
/* bit 4 could be the ROM bank selector for 8000-bfff (not sure) */
bankaddress = 0x10000 + ((data & 0x10) >> 4) * 0x4000;
cpu_setbank(1,&RAM[bankaddress]);
/* bit 5 = char bank */
if (charbank != ((data & 0x20) >> 5))
{
charbank = (data & 0x20) >> 5;
memset(dirtybuffer,1,videoram_size);
}
/* bit 6 - 7 unknown */
}
/***************************************************************************
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 hexa_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
/* for every character in the Video RAM, check if it has been modified */
/* since last time and update it accordingly. */
for (offs = videoram_size - 2;offs >= 0;offs -= 2)
{
if (dirtybuffer[offs] || dirtybuffer[offs + 1])
{
int sx,sy;
dirtybuffer[offs] = 0;
dirtybuffer[offs + 1] = 0;
sx = (offs/2) % 32;
sy = (offs/2) / 32;
if (flipx) sx = 31 - sx;
if (flipy) sy = 31 - sy;
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs + 1] + ((videoram[offs] & 0x07) << 8) + (charbank << 11),
(videoram[offs] & 0xf8) >> 3,
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);
}