📄 rallyx.c
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/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *rallyx_videoram2,*rallyx_colorram2;
unsigned char *rallyx_radarcarx,*rallyx_radarcary,*rallyx_radarcarcolor;
int rallyx_radarram_size;
unsigned char *rallyx_scrollx,*rallyx_scrolly;
static unsigned char *dirtybuffer2; /* keep track of modified portions of the screen */
/* to speed up video refresh */
static struct osd_bitmap *tmpbitmap1;
static int flipscreen;
static struct rectangle spritevisiblearea =
{
0*8, 28*8-1,
0*8, 28*8-1
};
static struct rectangle spritevisibleareaflip =
{
8*8, 36*8-1,
0*8, 28*8-1
};
static struct rectangle radarvisiblearea =
{
28*8, 36*8-1,
0*8, 28*8-1
};
static struct rectangle radarvisibleareaflip =
{
0*8, 8*8-1,
0*8, 28*8-1
};
/***************************************************************************
Convert the color PROMs into a more useable format.
Rally X has one 32x8 palette PROM and one 256x4 color lookup table PROM.
The palette PROM is connected to the RGB output this way:
bit 7 -- 220 ohm resistor -- BLUE
-- 470 ohm resistor -- BLUE
-- 220 ohm resistor -- GREEN
-- 470 ohm resistor -- GREEN
-- 1 kohm resistor -- GREEN
-- 220 ohm resistor -- RED
-- 470 ohm resistor -- RED
bit 0 -- 1 kohm resistor -- RED
***************************************************************************/
void rallyx_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++;
}
/* color_prom now points to the beginning of the lookup table */
/* character lookup table */
/* sprites use the same color lookup table as characters */
/* characters use colors 0-15 */
for (i = 0;i < TOTAL_COLORS(0);i++)
COLOR(0,i) = *(color_prom++) & 0x0f;
/* radar dots lookup table */
/* they use colors 16-31 */
for (i = 0;i < TOTAL_COLORS(2);i++)
{
if (i % 2 == 0) COLOR(2,i) = 0;
else COLOR(2,i) = (i / 2) + 16;
}
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int rallyx_vh_start(void)
{
if (generic_vh_start() != 0)
return 1;
if ((dirtybuffer2 = malloc(videoram_size)) == 0)
return 1;
memset(dirtybuffer2,1,videoram_size);
if ((tmpbitmap1 = osd_create_bitmap(32*8,32*8)) == 0)
{
free(dirtybuffer2);
generic_vh_stop();
return 1;
}
return 0;
}
/***************************************************************************
Stop the video hardware emulation.
***************************************************************************/
void rallyx_vh_stop(void)
{
osd_free_bitmap(tmpbitmap1);
free(dirtybuffer2);
generic_vh_stop();
}
void rallyx_videoram2_w(int offset,int data)
{
if (rallyx_videoram2[offset] != data)
{
dirtybuffer2[offset] = 1;
rallyx_videoram2[offset] = data;
}
}
void rallyx_colorram2_w(int offset,int data)
{
if (rallyx_colorram2[offset] != data)
{
dirtybuffer2[offset] = 1;
rallyx_colorram2[offset] = data;
}
}
void rallyx_flipscreen_w(int offset,int data)
{
if (flipscreen != (data & 1))
{
flipscreen = data & 1;
memset(dirtybuffer,1,videoram_size);
memset(dirtybuffer2,1,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 int displacement;
void rallyx_init(void)
{
displacement = 1;
}
void jungler_init(void)
{
displacement = 0;
}
void rallyx_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,sx,sy;
/* 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 (dirtybuffer2[offs])
{
int flipx,flipy;
dirtybuffer2[offs] = 0;
sx = offs % 32;
sy = offs / 32;
flipx = ~rallyx_colorram2[offs] & 0x40;
flipy = rallyx_colorram2[offs] & 0x80;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap1,Machine->gfx[0],
rallyx_videoram2[offs],
rallyx_colorram2[offs] & 0x3f,
flipx,flipy,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* update radar */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (dirtybuffer[offs])
{
int flipx,flipy;
dirtybuffer[offs] = 0;
sx = (offs % 32) ^ 4;
sy = offs / 32 - 2;
flipx = ~colorram[offs] & 0x40;
flipy = colorram[offs] & 0x80;
if (flipscreen)
{
sx = 7 - sx;
sy = 27 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs],
colorram[offs] & 0x3f,
flipx,flipy,
8*sx,8*sy,
&radarvisibleareaflip,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
{
int scrollx,scrolly;
if (flipscreen)
{
scrollx = (*rallyx_scrollx - displacement) + 32;
scrolly = (*rallyx_scrolly + 16) - 32;
}
else
{
scrollx = -(*rallyx_scrollx - 3*displacement);
scrolly = -(*rallyx_scrolly + 16);
}
copyscrollbitmap(bitmap,tmpbitmap1,1,&scrollx,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* radar */
if (flipscreen)
copybitmap(bitmap,tmpbitmap,0,0,0,0,&radarvisibleareaflip,TRANSPARENCY_NONE,0);
else
copybitmap(bitmap,tmpbitmap,0,0,28*8,0,&radarvisiblearea,TRANSPARENCY_NONE,0);
/* draw the sprites */
for (offs = 0;offs < spriteram_size;offs += 2)
{
sx = spriteram[offs + 1] + ((spriteram_2[offs + 1] & 0x80) << 1) - displacement;
sy = 225 - spriteram_2[offs] - displacement;
drawgfx(bitmap,Machine->gfx[1],
(spriteram[offs] & 0xfc) >> 2,
spriteram_2[offs + 1] & 0x3f,
spriteram[offs] & 1,spriteram[offs] & 2,
sx,sy,
flipscreen ? &spritevisibleareaflip : &spritevisiblearea,TRANSPARENCY_COLOR,0);
}
/* draw the cars on the radar */
for (offs = 0; offs < rallyx_radarram_size;offs++)
{
int x,y;
int color;
/* TODO: map to the correct color */
color = ((rallyx_radarcarcolor[offs] >> 1) - 1) & 0x03; /* ?????? */
if (displacement) /* RallyX */
{
x = rallyx_radarcarx[offs] + ((~rallyx_radarcarcolor[offs] & 0x01) << 8);
if (flipscreen) x -= 3;
}
else /* Jungler */
x = rallyx_radarcarx[offs] + ((~rallyx_radarcarcolor[offs] & 0x08) << 5) + 1;
y = 238 - rallyx_radarcary[offs] - displacement;
drawgfx(bitmap,Machine->gfx[2],
0, /* this is just a square, generated by the hardware */
color,
0,0,
x,y,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
void locomotn_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,sx,sy;
/* 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 (dirtybuffer2[offs])
{
int flipx,flipy;
dirtybuffer2[offs] = 0;
sx = offs % 32;
sy = offs / 32;
/* not a mistake, one bit selects both flips */
flipx = rallyx_colorram2[offs] & 0x80;
flipy = rallyx_colorram2[offs] & 0x80;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap1,Machine->gfx[0],
(rallyx_videoram2[offs]&0x7f) + 2*(rallyx_colorram2[offs]&0x40) + 2*(rallyx_videoram2[offs]&0x80),
rallyx_colorram2[offs] & 0x3f,
flipx,flipy,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* update radar */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (dirtybuffer[offs])
{
int flipx,flipy;
dirtybuffer[offs] = 0;
sx = (offs % 32) ^ 4;
sy = offs / 32 - 2;
/* not a mistake, one bit selects both flips */
flipx = colorram[offs] & 0x80;
flipy = colorram[offs] & 0x80;
if (flipscreen)
{
sx = 7 - sx;
sy = 27 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
(videoram[offs]&0x7f) + 2*(colorram[offs]&0x40) + 2*(videoram[offs]&0x80),
colorram[offs] & 0x3f,
flipx,flipy,
8*sx,8*sy,
&radarvisibleareaflip,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
{
int scrollx,scrolly;
if (flipscreen)
{
scrollx = (*rallyx_scrollx) + 32;
scrolly = (*rallyx_scrolly + 16) - 32;
}
else
{
scrollx = -(*rallyx_scrollx);
scrolly = -(*rallyx_scrolly + 16);
}
copyscrollbitmap(bitmap,tmpbitmap1,1,&scrollx,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* radar */
if (flipscreen)
copybitmap(bitmap,tmpbitmap,0,0,0,0,&radarvisibleareaflip,TRANSPARENCY_NONE,0);
else
copybitmap(bitmap,tmpbitmap,0,0,28*8,0,&radarvisiblearea,TRANSPARENCY_NONE,0);
/* draw the sprites */
for (offs = 0;offs < spriteram_size;offs += 2)
{
sx = spriteram[offs + 1] - 1;
sy = 224 - spriteram_2[offs];
if (flipscreen) sx += 32;
drawgfx(bitmap,Machine->gfx[1],
((spriteram[offs] & 0x7c) >> 2) + 0x20*(spriteram[offs] & 0x01) + ((spriteram[offs] & 0x80) >> 1),
spriteram_2[offs + 1],
!flipscreen,!flipscreen,
sx,sy,
flipscreen ? &spritevisibleareaflip : &spritevisiblearea,TRANSPARENCY_COLOR,0);
}
/* draw the cars on the radar */
for (offs = 0; offs < rallyx_radarram_size;offs++)
{
int x,y;
int color;
/* it looks like the addresses used are
a000-a003 a004-a00f
8020-8023 8034-803f
8820-8823 8834-883f
so 8024-8033 and 8824-8833 are not used
*/
/* TODO: map to the correct color */
color = ((rallyx_radarcarcolor[offs & 0x0f] >> 1) - 1) & 0x03; /* ?????? */
color = 1;
/* the following seems wrong */
x = rallyx_radarcarx[offs];
if (flipscreen) x += 32;
y = 237 - rallyx_radarcary[offs];
drawgfx(bitmap,Machine->gfx[2],
0, /* this is just a square, generated by the hardware */
color,
0,0,
x,y,
flipscreen ? &spritevisibleareaflip : &spritevisiblearea,TRANSPARENCY_NONE,0);
}
}
void commsega_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,sx,sy;
/* 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 (dirtybuffer2[offs])
{
int flipx,flipy;
dirtybuffer2[offs] = 0;
sx = offs % 32;
sy = offs / 32;
/* not a mistake, one bit selects both flips */
flipx = rallyx_colorram2[offs] & 0x80;
flipy = rallyx_colorram2[offs] & 0x80;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap1,Machine->gfx[0],
(rallyx_videoram2[offs]&0x7f) + 2*(rallyx_colorram2[offs]&0x40) + 2*(rallyx_videoram2[offs]&0x80),
rallyx_colorram2[offs] & 0x3f,
flipx,flipy,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* update radar */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (dirtybuffer[offs])
{
int flipx,flipy;
dirtybuffer[offs] = 0;
sx = (offs % 32) ^ 4;
sy = offs / 32 - 2;
/* not a mistake, one bit selects both flips */
flipx = colorram[offs] & 0x80;
flipy = colorram[offs] & 0x80;
if (flipscreen)
{
sx = 7 - sx;
sy = 27 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
(videoram[offs]&0x7f) + 2*(colorram[offs]&0x40) + 2*(videoram[offs]&0x80),
colorram[offs] & 0x3f,
flipx,flipy,
8*sx,8*sy,
&radarvisibleareaflip,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
{
int scrollx,scrolly;
if (flipscreen)
{
scrollx = (*rallyx_scrollx) + 32;
scrolly = (*rallyx_scrolly + 16) - 32;
}
else
{
scrollx = -(*rallyx_scrollx);
scrolly = -(*rallyx_scrolly + 16);
}
copyscrollbitmap(bitmap,tmpbitmap1,1,&scrollx,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* radar */
if (flipscreen)
copybitmap(bitmap,tmpbitmap,0,0,0,0,&radarvisibleareaflip,TRANSPARENCY_NONE,0);
else
copybitmap(bitmap,tmpbitmap,0,0,28*8,0,&radarvisiblearea,TRANSPARENCY_NONE,0);
/* draw the sprites */
for (offs = 0;offs < spriteram_size;offs += 2)
{
int flipx,flipy;
sx = spriteram[offs + 1] - 1;
sy = 224 - spriteram_2[offs];
if (flipscreen) sx += 32;
flipx = ~spriteram[offs] & 1;
flipy = ~spriteram[offs] & 2;
if (flipscreen)
{
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,Machine->gfx[1],
((spriteram[offs] & 0x7c) >> 2) + 0x20 + ((spriteram[offs] & 0x80) >> 1),
0,
flipx,flipy,
sx,sy,
flipscreen ? &spritevisibleareaflip : &spritevisiblearea,TRANSPARENCY_COLOR,0);
}
/* draw the cars on the radar */
for (offs = 0; offs < rallyx_radarram_size;offs++)
{
int x,y;
int color;
/* it looks like the addresses used are
a000-a003 a004-a00f
8020-8023 8034-803f
8820-8823 8834-883f
so 8024-8033 and 8824-8833 are not used
*/
/* TODO: map to the correct color */
color = ((rallyx_radarcarcolor[offs & 0x0f] >> 1) - 1) & 0x03; /* ?????? */
color = 1;
/* the following doesn't work in commsega */
x = rallyx_radarcarx[offs];
if (flipscreen) x += 32;
y = 237 - rallyx_radarcary[offs];
drawgfx(bitmap,Machine->gfx[2],
0, /* this is just a square, generated by the hardware */
color,
0,0,
x,y,
flipscreen ? &spritevisibleareaflip : &spritevisiblearea,TRANSPARENCY_NONE,0);
}
}
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