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/*************************************************************/
/* */
/* Lazer Command video handler */
/* */
/*************************************************************/
#include "driver.h"
#include "includes/lazercmd.h"
int marker_x, marker_y;
/* scale a markers vertical position */
/* the following table shows how the markers */
/* vertical position worked in hardware */
/* marker_y lines marker_y lines */
/* 0 0 + 1 8 10 + 11 */
/* 1 2 + 3 9 12 + 13 */
/* 2 4 + 5 10 14 + 15 */
/* 3 6 + 7 11 16 + 17 */
/* 4 8 + 9 12 18 + 19 */
static int vert_scale(int data)
{
return ((data & 0x07)<<1) + ((data & 0xf8)>>3) * VERT_CHR;
}
/* plot a bitmap marker */
/* hardware has 2 marker sizes 2x2 and 4x2 selected by jumper */
/* meadows lanes normaly use 2x2 pixels and lazer command uses either */
static void plot_pattern(running_machine *machine, mame_bitmap *bitmap, int x, int y)
{
int xbit, ybit, size;
size = 2;
if (input_port_2_r(0) & 0x40)
{
size = 4;
}
for (ybit = 0; ybit < 2; ybit++)
{
if (y+ybit < 0 || y+ybit >= VERT_RES * VERT_CHR)
return;
for (xbit = 0; xbit < size; xbit++)
{
if (x+xbit < 0 || x+xbit >= HORZ_RES * HORZ_CHR)
continue;
*BITMAP_ADDR16(bitmap, y+ybit, x+xbit) = 4;
}
}
}
VIDEO_UPDATE( lazercmd )
{
int i,x,y;
int video_inverted = input_port_2_r(0) & 0x20;
/* The first row of characters are invisible */
for (i = 0; i < (VERT_RES - 1) * HORZ_RES; i++)
{
int sx,sy;
sx = i % HORZ_RES;
sy = i / HORZ_RES;
sx *= HORZ_CHR;
sy *= VERT_CHR;
drawgfx(bitmap, machine->gfx[0],
videoram[i], video_inverted ? 1 : 0,
0,0,
sx,sy,
&machine->screen[0].visarea,TRANSPARENCY_NONE,0);
}
x = marker_x - 1; /* normal video lags marker by 1 pixel */
y = vert_scale(marker_y) - VERT_CHR; /* first line used as scratch pad */
plot_pattern(machine, bitmap,x,y);
return 0;
}
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