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AmigActive 10
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AACD 10.iso
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vidhrdw
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rockola.c
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C/C++ Source or Header
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2000-04-04
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9KB
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376 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *rockola_videoram2;
unsigned char *rockola_characterram;
unsigned char *rockola_scrollx,*rockola_scrolly;
static unsigned char dirtycharacter[256];
static int flipscreen;
static int charbank;
static int backcolor;
/***************************************************************************
Convert the color PROMs into a more useable format.
Zarzon has a different PROM layout from the others.
***************************************************************************/
void rockola_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 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++;
}
backcolor = 0; /* background color can be changed by the game */
for (i = 0;i < TOTAL_COLORS(0);i++)
COLOR(0,i) = i;
for (i = 0;i < TOTAL_COLORS(1);i++)
{
if (i % 4 == 0) COLOR(1,i) = 4 * backcolor + 0x20;
else COLOR(1,i) = i + 0x20;
}
}
void satansat_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 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++;
}
backcolor = 0; /* background color can be changed by the game */
for (i = 0;i < TOTAL_COLORS(0);i++)
COLOR(0,i) = 4 * (i % 4) + (i / 4);
for (i = 0;i < TOTAL_COLORS(1);i++)
{
if (i % 4 == 0) COLOR(1,i) = backcolor + 0x10;
else COLOR(1,i) = 4 * (i % 4) + (i / 4) + 0x10;
}
}
WRITE_HANDLER( rockola_characterram_w )
{
if (rockola_characterram[offset] != data)
{
dirtycharacter[(offset / 8) & 0xff] = 1;
rockola_characterram[offset] = data;
}
}
WRITE_HANDLER( rockola_flipscreen_w )
{
/* bits 0-2 select background color */
if (backcolor != (data & 7))
{
int i;
backcolor = data & 7;
for (i = 0;i < 32;i += 4)
Machine->gfx[1]->colortable[i] = Machine->pens[4 * backcolor + 0x20];
memset(dirtybuffer,1,videoram_size);
}
/* bit 3 selects char bank */
if (charbank != ((~data & 0x08) >> 3))
{
charbank = (~data & 0x08) >> 3;
memset(dirtybuffer,1,videoram_size);
}
/* bit 7 flips screen */
if (flipscreen != (data & 0x80))
{
flipscreen = data & 0x80;
memset(dirtybuffer,1,videoram_size);
}
}
WRITE_HANDLER( satansat_b002_w )
{
/* bit 0 flips screen */
if (flipscreen != (data & 0x01))
{
flipscreen = data & 0x01;
memset(dirtybuffer,1,videoram_size);
}
/* bit 1 enables interrups */
/* it controls only IRQs, not NMIs. Here I am affecting both, which */
/* is wrong. */
interrupt_enable_w(0,data & 0x02);
/* other bits unused */
}
WRITE_HANDLER( satansat_backcolor_w )
{
/* bits 0-1 select background color. Other bits unused. */
if (backcolor != (data & 3))
{
int i;
backcolor = data & 3;
for (i = 0;i < 16;i += 4)
Machine->gfx[1]->colortable[i] = Machine->pens[backcolor + 0x10];
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 rockola_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
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;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
if (flipscreen)
{
sx = 31 - sx;
/* Pioner Balloon has a visible area different from all the others */
if (Machine->drv->visible_area.max_y == 28*8-1)
sy = 27 - sy;
else
sy = 31 - sy;
}
drawgfx(tmpbitmap,Machine->gfx[1],
videoram[offs] + 256 * charbank,
(colorram[offs] & 0x38) >> 3,
flipscreen,flipscreen,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* copy the background graphics */
{
int scrollx,scrolly;
scrollx = -*rockola_scrolly;
scrolly = -*rockola_scrollx;
if (flipscreen)
{
scrollx = -scrollx;
/* Pioner Balloon has a visible area different from all the others */
if (Machine->drv->visible_area.max_y == 28*8-1)
scrolly = -scrolly - 32;
else
scrolly = -scrolly;
}
copyscrollbitmap(bitmap,tmpbitmap,1,&scrollx,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* draw the frontmost playfield. They are characters, but draw them as sprites */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
int charcode;
int sx,sy;
charcode = rockola_videoram2[offs];
/* decode modified characters */
if (dirtycharacter[charcode] != 0)
{
decodechar(Machine->gfx[0],charcode,rockola_characterram,
Machine->drv->gfxdecodeinfo[0].gfxlayout);
dirtycharacter[charcode] = 0;
}
sx = offs % 32;
sy = offs / 32;
if (flipscreen)
{
sx = 31 - sx;
/* Pioner Balloon has a visible area different from all the others */
if (Machine->drv->visible_area.max_y == 28*8-1)
sy = 27 - sy;
else
sy = 31 - sy;
}
drawgfx(bitmap,Machine->gfx[0],
charcode,
colorram[offs] & 0x07,
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
/* Zarzon's background doesn't scroll, and the color code selection is different. */
void satansat_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
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;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
if (flipscreen)
{
sx = 31 - sx;
sy = 27 - sy;
}
drawgfx(tmpbitmap,Machine->gfx[1],
videoram[offs],
(colorram[offs] & 0x0c) >> 2,
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* draw the frontmost playfield. They are characters, but draw them as sprites */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
int charcode;
int sx,sy;
charcode = rockola_videoram2[offs];
/* decode modified characters */
if (dirtycharacter[charcode] != 0)
{
decodechar(Machine->gfx[0],charcode,rockola_characterram,
Machine->drv->gfxdecodeinfo[0].gfxlayout);
dirtycharacter[charcode] = 0;
}
sx = offs % 32;
sy = offs / 32;
if (flipscreen)
{
sx = 31 - sx;
sy = 27 - sy;
}
drawgfx(bitmap,Machine->gfx[0],
charcode,
colorram[offs] & 0x03,
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}