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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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src
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vidhrdw
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marineb.c
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C/C++ Source or Header
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2000-04-04
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8KB
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455 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *marineb_column_scroll;
int marineb_active_low_flipscreen;
static int palbank;
static int flipscreen_x;
static int flipscreen_y;
WRITE_HANDLER( marineb_palbank0_w )
{
if ((palbank & 1) != (data & 1))
{
palbank = (palbank & ~1) | (data & 1);
memset(dirtybuffer, 1, videoram_size);
}
}
WRITE_HANDLER( marineb_palbank1_w )
{
data <<= 1;
if ((palbank & 2) != (data & 2))
{
palbank = (palbank & ~2) | (data & 2);
memset(dirtybuffer, 1, videoram_size);
}
}
WRITE_HANDLER( marineb_flipscreen_x_w )
{
if (flipscreen_x != (data ^ marineb_active_low_flipscreen))
{
flipscreen_x = data ^ marineb_active_low_flipscreen;
memset(dirtybuffer, 1, videoram_size);
}
}
WRITE_HANDLER( marineb_flipscreen_y_w )
{
if (flipscreen_y != (data ^ marineb_active_low_flipscreen))
{
flipscreen_y = data ^ marineb_active_low_flipscreen;
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 scroll_cols)
{
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,flipx,flipy;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
flipx = colorram[offs] & 0x20;
flipy = colorram[offs] & 0x10;
if (flipscreen_y)
{
sy = 31 - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx = 31 - sx;
flipx = !flipx;
}
drawgfx(_tmpbitmap,Machine->gfx[0],
videoram[offs] | ((colorram[offs] & 0xc0) << 2),
(colorram[offs] & 0x0f) + 16 * palbank,
flipx,flipy,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
{
int scroll[32];
if (flipscreen_y)
{
for (offs = 0;offs < 32 - scroll_cols;offs++)
scroll[offs] = 0;
for (;offs < 32;offs++)
scroll[offs] = marineb_column_scroll[0];
}
else
{
for (offs = 0;offs < scroll_cols;offs++)
scroll[offs] = -marineb_column_scroll[0];
for (;offs < 32;offs++)
scroll[offs] = 0;
}
copyscrollbitmap(bitmap,tmpbitmap,0,0,32,scroll,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
void marineb_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
draw_chars(tmpbitmap, bitmap, 24);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx,sx,sy,code,col,flipx,flipy,offs2;
if ((offs == 0) || (offs == 2)) continue; /* no sprites here */
if (offs < 8)
{
offs2 = 0x0018 + offs;
}
else
{
offs2 = 0x03d8 - 8 + offs;
}
code = videoram[offs2];
sx = videoram[offs2 + 0x20];
sy = colorram[offs2];
col = (colorram[offs2 + 0x20] & 0x0f) + 16 * palbank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!flipscreen_y)
{
sy = 256 - Machine->gfx[gfx]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx++;
}
drawgfx(bitmap,Machine->gfx[gfx],
code,
col,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void changes_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,sx,sy,code,col,flipx,flipy;
draw_chars(tmpbitmap, bitmap, 26);
/* draw the small sprites */
for (offs = 0x05; offs >= 0; offs--)
{
int offs2;
offs2 = 0x001a + offs;
code = videoram[offs2];
sx = videoram[offs2 + 0x20];
sy = colorram[offs2];
col = (colorram[offs2 + 0x20] & 0x0f) + 16 * palbank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!flipscreen_y)
{
sy = 256 - Machine->gfx[1]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx++;
}
drawgfx(bitmap,Machine->gfx[1],
code >> 2,
col,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
/* draw the big sprite */
code = videoram[0x3df];
sx = videoram[0x3ff];
sy = colorram[0x3df];
col = colorram[0x3ff];
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!flipscreen_y)
{
sy = 256 - Machine->gfx[2]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx++;
}
code >>= 4;
drawgfx(bitmap,Machine->gfx[2],
code,
col,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
/* draw again for wrap around */
drawgfx(bitmap,Machine->gfx[2],
code,
col,
flipx,flipy,
sx-256,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
void springer_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
draw_chars(tmpbitmap, bitmap, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx,sx,sy,code,col,flipx,flipy,offs2;
if ((offs == 0) || (offs == 2)) continue; /* no sprites here */
offs2 = 0x0010 + offs;
code = videoram[offs2];
sx = 240 - videoram[offs2 + 0x20];
sy = colorram[offs2];
col = (colorram[offs2 + 0x20] & 0x0f) + 16 * palbank;
flipx = !(code & 0x02);
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
sx -= 0x10;
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!flipscreen_y)
{
sy = 256 - Machine->gfx[gfx]->width - sy;
flipy = !flipy;
}
if (!flipscreen_x)
{
sx--;
}
drawgfx(bitmap,Machine->gfx[gfx],
code,
col,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void hoccer_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
draw_chars(tmpbitmap, bitmap, 0);
/* draw the sprites */
for (offs = 0x07; offs >= 0; offs--)
{
int sx,sy,code,col,flipx,flipy,offs2;
offs2 = 0x0018 + offs;
code = spriteram[offs2];
sx = spriteram[offs2 + 0x20];
sy = colorram[offs2];
col = colorram[offs2 + 0x20];
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!flipscreen_y)
{
sy = 256 - Machine->gfx[1]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx = 256 - Machine->gfx[1]->width - sx;
flipx = !flipx;
}
drawgfx(bitmap,Machine->gfx[1],
code >> 2,
col,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void hopprobo_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
draw_chars(tmpbitmap, bitmap, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx,sx,sy,code,col,flipx,flipy,offs2;
if ((offs == 0) || (offs == 2)) continue; /* no sprites here */
offs2 = 0x0010 + offs;
code = videoram[offs2];
sx = videoram[offs2 + 0x20];
sy = colorram[offs2];
col = (colorram[offs2 + 0x20] & 0x0f) + 16 * palbank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!flipscreen_y)
{
sy = 256 - Machine->gfx[gfx]->width - sy;
flipy = !flipy;
}
if (!flipscreen_x)
{
sx--;
}
drawgfx(bitmap,Machine->gfx[gfx],
code,
col,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}