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AmigActive 10
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AACD 10.iso
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AACD
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MAME
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vidhrdw
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funkybee.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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162 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *funkyb_row_scroll;
static int gfx_bank;
void funkybee_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i;
/* first, the character/sprite palette */
for (i = 0;i < 32;i++)
{
int bit0,bit1,bit2;
/* red component */
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (*color_prom >> 3) & 0x01;
bit1 = (*color_prom >> 4) & 0x01;
bit2 = (*color_prom >> 5) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
color_prom++;
}
}
WRITE_HANDLER( funkybee_gfx_bank_w )
{
if (data != (gfx_bank & 0x01))
{
gfx_bank = data & 0x01;
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.
***************************************************************************/
static void draw_chars(struct osd_bitmap *_tmpbitmap, struct osd_bitmap *bitmap)
{
int sx,sy;
/* for every character in the Video RAM, check if it has been modified */
/* since last time and update it accordingly. */
for (sy = 0x1f;sy >= 0;sy--)
{
int offs;
offs = (sy << 8) | 0x1f;
for (sx = 0x1f;sx >= 0;sx--,offs--)
{
if (dirtybuffer[offs])
{
dirtybuffer[offs] = 0;
drawgfx(_tmpbitmap,Machine->gfx[gfx_bank],
videoram[offs],
colorram[offs] & 0x03,
0,0,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
}
/* copy the temporary bitmap to the screen */
{
int offs,scroll[32];
for (offs = 0;offs < 28;offs++)
scroll[offs] = -*funkyb_row_scroll;
for (;offs < 32;offs++)
scroll[offs] = 0;
copyscrollbitmap(bitmap,_tmpbitmap,32,scroll,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
void funkybee_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
draw_chars(tmpbitmap, bitmap);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int sx,sy,code,col,flipy,offs2;
offs2 = 0x1e00 + offs;
code = videoram[offs2];
sx = videoram[offs2 + 0x10];
sy = 224 - colorram[offs2];
col = colorram[offs2 + 0x10];
flipy = code & 0x01;
drawgfx(bitmap,Machine->gfx[2+gfx_bank],
(code >> 2) | ((code & 2) << 5),
col,
0,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
/* draw the two variable position columns */
for (offs = 0x1f;offs >= 0;offs--)
{
drawgfx(bitmap,Machine->gfx[gfx_bank],
videoram[offs+0x1c00],
colorram[0x1f10] & 0x03,
0,0,
videoram[0x1f10],8*offs,
0,TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[gfx_bank],
videoram[offs+0x1d00],
colorram[0x1f11] & 0x03,
0,0,
videoram[0x1f11],8*offs,
0,TRANSPARENCY_PEN,0);
}
}