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AmigActive 10
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AACD 10.iso
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vidhrdw
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tankbatt.c
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C/C++ Source or Header
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2000-05-04
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3KB
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129 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *tankbatt_bulletsram;
size_t tankbatt_bulletsram_size;
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
void tankbatt_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])
#define RES_1 0xc0 /* this is a guess */
#define RES_2 0x3f /* this is a guess */
/* Stick black in there */
*(palette++) = 0;
*(palette++) = 0;
*(palette++) = 0;
/* ? Skip the first byte ? */
color_prom++;
for (i = 1;i < Machine->drv->total_colors;i++)
{
int bit0, bit1, bit2, bit3;
bit0 = (*color_prom >> 0) & 0x01; /* intensity */
bit1 = (*color_prom >> 1) & 0x01; /* red */
bit2 = (*color_prom >> 2) & 0x01; /* green */
bit3 = (*color_prom >> 3) & 0x01; /* blue */
/* red component */
*(palette) = RES_1 * bit1;
if (bit1) *(palette) += RES_2 * bit0;
palette++;
/* green component */
*(palette) = RES_1 * bit2;
if (bit2) *(palette) += RES_2 * bit0;
palette++;
/* blue component */
*(palette) = RES_1 * bit3;
if (bit3) *(palette) += RES_2 * bit0;
palette++;
color_prom += 4;
}
for (i = 0;i < 128;i++)
{
colortable[i++] = 0;
colortable[i] = (i/2) + 1;
}
}
/***************************************************************************
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 tankbatt_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 - 1; offs >= 0; offs--)
{
if (dirtybuffer[offs])
{
int sx,sy;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs],
(videoram[offs]) >> 2,
0,0,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* Draw the bullets */
for (offs = 0;offs < tankbatt_bulletsram_size;offs += 2)
{
int x,y;
int color;
color = 63; /* cyan, same color as the tanks */
x = tankbatt_bulletsram[offs + 1];
y = 255 - tankbatt_bulletsram[offs] - 2;
drawgfx(bitmap,Machine->gfx[1],
0, /* this is just a square, generated by the hardware */
color,
0,0,
x,y,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}