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vidhrdw
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lazercmd.c
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C/C++ Source or Header
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2000-05-20
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4KB
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154 lines
/*************************************************************/
/* */
/* Lazer Command video handler */
/* */
/*************************************************************/
#include "driver.h"
#include "artwork.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/lazercmd.h"
extern int marker_x, marker_y;
static int video_inverted = 0;
#define JADE 0x20,0xb0,0x20,OVERLAY_DEFAULT_OPACITY
#define MUSTARD 0xb0,0x80,0x20,OVERLAY_DEFAULT_OPACITY
#define END {{ -1, -1, -1, -1}, 0,0,0,0}
static const struct artwork_element overlay[]=
{
{{ 0*HORZ_CHR, 16*HORZ_CHR-1, 0*VERT_CHR, 1*VERT_CHR-1 }, MUSTARD },
{{ 16*HORZ_CHR, 32*HORZ_CHR-1, 0*VERT_CHR, 1*VERT_CHR-1 }, JADE },
{{ 0*HORZ_CHR, 16*HORZ_CHR-1, 1*VERT_CHR,22*VERT_CHR-1 }, JADE },
{{ 16*HORZ_CHR, 32*HORZ_CHR-1, 1*VERT_CHR,22*VERT_CHR-1 }, MUSTARD },
{{ 0*HORZ_CHR, 16*HORZ_CHR-1, 22*VERT_CHR,23*VERT_CHR-1 }, MUSTARD },
{{ 16*HORZ_CHR, 32*HORZ_CHR-1, 22*VERT_CHR,23*VERT_CHR-1 }, JADE },
END
};
/* 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;
}
/* mark the character occupied by the marker dirty */
void lazercmd_marker_dirty(int marker)
{
int x, y;
x = marker_x - 1; /* normal video lags marker by 1 pixel */
y = vert_scale(marker_y) - VERT_CHR; /* first line used as scratch pad */
if (x < 0 || x >= HORZ_RES * HORZ_CHR)
return;
if (y < 0 || y >= (VERT_RES - 1) * VERT_CHR)
return;
/* mark all occupied character positions dirty */
dirtybuffer[(y+0)/VERT_CHR * HORZ_RES + (x+0)/HORZ_CHR] = 1;
dirtybuffer[(y+3)/VERT_CHR * HORZ_RES + (x+0)/HORZ_CHR] = 1;
dirtybuffer[(y+0)/VERT_CHR * HORZ_RES + (x+3)/HORZ_CHR] = 1;
dirtybuffer[(y+3)/VERT_CHR * HORZ_RES + (x+3)/HORZ_CHR] = 1;
}
/* 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(struct osd_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;
plot_pixel(bitmap, x+xbit, y+ybit, Machine->pens[2]);
}
}
}
int lazercmd_vh_start(void)
{
if( generic_vh_start() )
return 1;
/* is overlay enabled? */
if (input_port_2_r(0) & 0x80)
{
overlay_create(overlay, 3, Machine->drv->total_colors-3);
}
return 0;
}
void lazercmd_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int i,x,y;
if (video_inverted != (input_port_2_r(0) & 0x20))
{
video_inverted = input_port_2_r(0) & 0x20;
memset(dirtybuffer, 1, videoram_size);
}
if (palette_recalc() || full_refresh)
memset(dirtybuffer, 1, videoram_size);
/* The first row of characters are invisible */
for (i = 0; i < (VERT_RES - 1) * HORZ_RES; i++)
{
if (dirtybuffer[i])
{
int sx,sy;
dirtybuffer[i] = 0;
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->drv->visible_area,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(bitmap,x,y);
}