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AmigActive 10
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AACD 10.iso
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AACD
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vidhrdw
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crbaloon.c
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C/C++ Source or Header
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2000-04-04
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4KB
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166 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int spritectrl[3];
static int flipscreen;
int crbaloon_collision;
/***************************************************************************
Convert the color PROMs into a more useable format.
Crazy Balloon has no PROMs, the color code directly maps to a color:
all bits are inverted
bit 3 HALF (intensity)
bit 2 BLUE
bit 1 GREEN
bit 0 RED
***************************************************************************/
void crbaloon_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])
for (i = 0;i < Machine->drv->total_colors;i++)
{
int intensity;
intensity = (~i & 0x08) ? 0xff : 0x55;
/* red component */
*(palette++) = intensity * ((~i >> 0) & 1);
/* green component */
*(palette++) = intensity * ((~i >> 1) & 1);
/* blue component */
*(palette++) = intensity * ((~i >> 2) & 1);
}
for (i = 0;i < TOTAL_COLORS(0);i += 2)
{
COLOR(0,i) = 15; /* black background */
COLOR(0,i + 1) = i / 2; /* colored foreground */
}
}
WRITE_HANDLER( crbaloon_spritectrl_w )
{
spritectrl[offset] = data;
}
WRITE_HANDLER( crbaloon_flipscreen_w )
{
if (flipscreen != (data & 1))
{
flipscreen = data & 1;
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 crbaloon_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,x,y;
int bx,by;
/* 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;
if (flipscreen == 0)
{
sx = 31 - sx;
sy = 35 - sy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs],
colorram[offs] & 0x0f,
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the character mapped graphics */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* Check Collision - Draw balloon in background colour, if no */
/* collision occured, bitmap will be same as tmpbitmap */
bx = spritectrl[1];
by = spritectrl[2];
drawgfx(bitmap,Machine->gfx[1],
spritectrl[0] & 0x0f,
15,
0,0,
bx,by,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
crbaloon_collision = 0;
for (x = bx; x < bx + Machine->gfx[1]->width; x++)
{
for (y = by; y < by + Machine->gfx[1]->height; y++)
{
if ((x < Machine->drv->visible_area.min_x) ||
(x > Machine->drv->visible_area.max_x) ||
(y < Machine->drv->visible_area.min_y) ||
(y > Machine->drv->visible_area.max_y))
{
continue;
}
if (read_pixel(bitmap, x, y) != read_pixel(tmpbitmap, x, y))
{
crbaloon_collision = -1;
break;
}
}
}
/* actually draw the balloon */
drawgfx(bitmap,Machine->gfx[1],
spritectrl[0] & 0x0f,
(spritectrl[0] & 0xf0) >> 4,
0,0,
bx,by,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}