/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
This file is also used by scregg.c
***************************************************************************/
#include "driver.h"
UINT8 *btime_videoram;
size_t btime_videoram_size;
UINT8 *btime_colorram;
UINT8 *lnc_charbank;
UINT8 *bnj_backgroundram;
UINT8 *zoar_scrollram;
UINT8 *deco_charram;
size_t bnj_backgroundram_size;
static int sprite_dirty[256];
static int char_dirty[1024];
static UINT8 btime_palette = 0;
static UINT8 bnj_scroll1 = 0;
static UINT8 bnj_scroll2 = 0;
static mame_bitmap *background_bitmap;
static UINT8 lnc_sound_interrupt_enabled = 0;
/***************************************************************************
Burger Time doesn't have a color PROM. It uses RAM to dynamically
create the palette.
The palette RAM is connected to the RGB output this way:
bit 7 -- 15 kohm resistor -- BLUE (inverted)
-- 33 kohm resistor -- BLUE (inverted)
-- 15 kohm resistor -- GREEN (inverted)
-- 33 kohm resistor -- GREEN (inverted)
-- 47 kohm resistor -- GREEN (inverted)
-- 15 kohm resistor -- RED (inverted)
-- 33 kohm resistor -- RED (inverted)
bit 0 -- 47 kohm resistor -- RED (inverted)
***************************************************************************/
PALETTE_INIT( btime )
{
int i;
/* Burger Time doesn't have a color PROM, but Hamburge has. */
/* This function is also used by Eggs. */
if (color_prom == 0) return;
for (i = 0;i < machine->drv->total_colors;i++)
{
int bit0,bit1,bit2,r,g,b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette_set_color(machine,i,MAKE_RGB(r,g,b));
}
}
/***************************************************************************
Convert the color PROMs into a more useable format.
The PROM is connected to the RGB output this way:
bit 7 -- 47 kohm resistor -- RED
-- 33 kohm resistor -- RED
-- 15 kohm resistor -- RED
-- 47 kohm resistor -- GREEN
-- 33 kohm resistor -- GREEN
-- 15 kohm resistor -- GREEN
-- 33 kohm resistor -- BLUE
bit 0 -- 15 kohm resistor -- BLUE
***************************************************************************/
PALETTE_INIT( lnc )
{
int i;
for (i = 0;i < machine->drv->total_colors;i++)
{
int bit0,bit1,bit2,r,g,b;
/* red component */
bit0 = (color_prom[i] >> 7) & 0x01;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 4) & 0x01;
bit1 = (color_prom[i] >> 3) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 0) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette_set_color(machine,i,MAKE_RGB(r,g,b));
}
}
MACHINE_RESET( lnc )
{
*lnc_charbank = 1;
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( btime )
{
bnj_scroll1 = 0;
bnj_scroll2 = 0;
btime_palette = 0;
}
VIDEO_START( bnj )
{
/* the background area is twice as wide as the screen */
background_bitmap = auto_bitmap_alloc(2*machine->screen[0].width,machine->screen[0].height,machine->screen[0].format);
video_start_btime(machine);
}
WRITE8_HANDLER( btime_paletteram_w )
{
/* RGB output is inverted */
paletteram_BBGGGRRR_w(offset,~data);
}
WRITE8_HANDLER( lnc_videoram_w )
{
btime_videoram[offset] = data;
btime_colorram[offset] = *lnc_charbank;
}
READ8_HANDLER( btime_mirrorvideoram_r )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
return btime_videoram[offset];
}
READ8_HANDLER( btime_mirrorcolorram_r )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
return btime_colorram[offset];
}
WRITE8_HANDLER( btime_mirrorvideoram_w )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
btime_videoram[offset] = data;
}
WRITE8_HANDLER( lnc_mirrorvideoram_w )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
lnc_videoram_w(offset,data);
}
WRITE8_HANDLER( btime_mirrorcolorram_w )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
btime_colorram[offset] = data;
}
WRITE8_HANDLER( deco_charram_w )
{
if (deco_charram[offset] == data) return;
deco_charram[offset] = data;
offset &= 0x1fff;
/* dirty sprite */
sprite_dirty[offset >> 5] = 1;
/* diry char */
char_dirty [offset >> 3] = 1;
}
WRITE8_HANDLER( bnj_background_w )
{
bnj_backgroundram[offset] = data;
}
WRITE8_HANDLER( bnj_scroll1_w )
{
bnj_scroll1 = data;
}
WRITE8_HANDLER( bnj_scroll2_w )
{
bnj_scroll2 = data;
}
WRITE8_HANDLER( zoar_video_control_w )
{
// Zoar video control
//
// Bit 0-2 = Unknown (always 0). Marked as MCOL on schematics
// Bit 3-4 = Palette
// Bit 7 = Flip Screen
btime_palette = (data & 0x30) >> 3;
flip_screen_set(data & 0x80);
}
WRITE8_HANDLER( btime_video_control_w )
{
// Btime video control
//
// Bit 0 = Flip screen
// Bit 1-7 = Unknown
flip_screen_set(data & 0x01);
}
WRITE8_HANDLER( bnj_video_control_w )
{
/* Bnj/Lnc works a little differently than the btime/eggs (apparently). */
/* According to the information at: */
/* http://www.davesclassics.com/arcade/Switch_Settings/BumpNJump.sw */
/* SW8 is used for cocktail video selection (as opposed to controls), */
/* but bit 7 of the input port is used for vblank input. */
/* My guess is that this switch open circuits some connection to */
/* the monitor hardware. */
/* For now we just check 0x40 in DSW1, and ignore the write if we */
/* are in upright controls mode. */
if (input_port_3_r(0) & 0x40) /* cocktail mode */
btime_video_control_w(offset, data);
}
WRITE8_HANDLER( lnc_video_control_w )
{
// I have a feeling that this only works by coincidence. I couldn't
// figure out how NMI's are disabled by the sound processor
lnc_sound_interrupt_enabled = data & 0x08;
bnj_video_control_w(offset, data & 0x01);
}
WRITE8_HANDLER( disco_video_control_w )
{
btime_palette = (data >> 2) & 0x03;
if (!(input_port_3_r(0) & 0x40)) /* cocktail mode */
{
flip_screen_set(data & 0x01);
}
}
INTERRUPT_GEN( lnc_sound_interrupt )
{
if (lnc_sound_interrupt_enabled)
cpunum_set_input_line(1, INPUT_LINE_NMI, PULSE_LINE);
}
static void draw_chars(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, UINT8 transparency, UINT8 color, int priority)
{
offs_t offs;
for (offs = 0; offs < btime_videoram_size; offs++)
{
UINT8 x = 31 - (offs / 32);
UINT8 y = offs % 32;
UINT16 code = btime_videoram[offs] + 256 * (btime_colorram[offs] & 3);
/* check priority */
if ((priority != -1) && (priority != ((code >> 7) & 0x01))) continue;
if (flip_screen)
{
x = 31 - x;
y = 31 - y;
}
drawgfx(bitmap,machine->gfx[0],
code,
color,
flip_screen,flip_screen,
8*x,8*y,
cliprect,transparency,0);
}
}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, UINT8 color,
UINT8 sprite_y_adjust, UINT8 sprite_y_adjust_flip_screen,
UINT8 *sprite_ram, offs_t interleave)
{
int i;
offs_t offs;
/* draw the sprites */
for (i = 0, offs = 0; i < 8; i++, offs += 4*interleave)
{
int x, y;
UINT8 flipx,flipy;
if (!(sprite_ram[offs + 0] & 0x01)) continue;
x = 240 - sprite_ram[offs + 3*interleave];
y = 240 - sprite_ram[offs + 2*interleave];
flipx = sprite_ram[offs + 0] & 0x04;
flipy = sprite_ram[offs + 0] & 0x02;
if (flip_screen)
{
x = 240 - x;
y = 240 - y + sprite_y_adjust_flip_screen;
flipx = !flipx;
flipy = !flipy;
}
y = y - sprite_y_adjust;
drawgfx(bitmap,machine->gfx[1],
sprite_ram[offs + interleave],
color,
flipx,flipy,
x, y,
cliprect,TRANSPARENCY_PEN,0);
y = y + (flip_screen ? -256 : 256);
// Wrap around
drawgfx(bitmap,machine->gfx[1],
sprite_ram[offs + interleave],
color,
flipx,flipy,
x,y,
cliprect,TRANSPARENCY_PEN,0);
}
}
static void draw_background(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, UINT8* tmap, UINT8 color)
{
int i;
int scroll = -(bnj_scroll2 | ((bnj_scroll1 & 0x03) << 8));
// One extra iteration for wrap around
for (i = 0; i < 5; i++, scroll += 256)
{
offs_t offs;
offs_t tileoffset = tmap[i & 3] * 0x100;
// Skip if this title is completely off the screen
if (scroll > 256) break;
if (scroll < -256) continue;
for (offs = 0; offs < 0x100; offs++)
{
int x = 240 - (16 * (offs / 16) + scroll);
int y = 16 * (offs % 16);
if (flip_screen)
{
x = 240 - x;
y = 240 - y;
}
drawgfx(bitmap, machine->gfx[2],
memory_region(REGION_GFX3)[tileoffset + offs],
color,
flip_screen,flip_screen,
x,y,
cliprect,TRANSPARENCY_NONE,0);
}
}
}
static void decode_modified(running_machine *machine, UINT8 *sprite_ram, int interleave)
{
int i,offs;
/* decode dirty characters */
for (offs = btime_videoram_size - 1;offs >= 0;offs--)
{
int code;
code = btime_videoram[offs] + 256 * (btime_colorram[offs] & 3);
if (char_dirty[code])
{
decodechar(machine->gfx[0],code,deco_charram,machine->drv->gfxdecodeinfo[0].gfxlayout);
char_dirty[code] = 0;
}
}
/* decode dirty sprites */
for (i = 0, offs = 0;i < 8; i++, offs += 4*interleave)
{
int code;
code = sprite_ram[offs + interleave];
if (sprite_dirty[code])
{
decodechar(machine->gfx[1],code,deco_charram,machine->drv->gfxdecodeinfo[1].gfxlayout);
sprite_dirty[code] = 0;
}
}
}
VIDEO_UPDATE( btime )
{
if (bnj_scroll1 & 0x10)
{
int i, start;
// Generate tile map
static UINT8 btime_tilemap[4];
if (flip_screen)
start = 0;
else
start = 1;
for (i = 0; i < 4; i++)
{
btime_tilemap[i] = start | (bnj_scroll1 & 0x04);
start = (start + 1) & 0x03;
}
draw_background(machine, bitmap, cliprect, btime_tilemap, 0);
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_PEN, 0, -1);
}
else
{
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, 0, -1);
}
draw_sprites(machine, bitmap, cliprect, 0, 1, 0, btime_videoram, 0x20);
return 0;
}
VIDEO_UPDATE( eggs )
{
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, 0, -1);
draw_sprites(machine, bitmap, cliprect, 0, 0, 0, btime_videoram, 0x20);
return 0;
}
VIDEO_UPDATE( lnc )
{
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, 0, -1);
draw_sprites(machine, bitmap, cliprect, 0, 1, 2, btime_videoram, 0x20);
return 0;
}
VIDEO_UPDATE( zoar )
{
if (bnj_scroll1 & 0x04)
{
draw_background(machine, bitmap, cliprect, zoar_scrollram, btime_palette);
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_PEN, btime_palette + 1, -1);
}
else
{
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, btime_palette + 1, -1);
}
/* The order is important for correct priorities */
draw_sprites(machine, bitmap, cliprect, btime_palette + 1, 1, 2, btime_videoram + 0x1f, 0x20);
draw_sprites(machine, bitmap, cliprect, btime_palette + 1, 1, 2, btime_videoram, 0x20);
return 0;
}
VIDEO_UPDATE( bnj )
{
if (bnj_scroll1)
{
int scroll, offs;
for (offs = bnj_backgroundram_size-1; offs >=0; offs--)
{
int sx,sy;
sx = 16 * ((offs < 0x100) ? ((offs % 0x80) / 8) : ((offs % 0x80) / 8) + 16);
sy = 16 * (((offs % 0x100) < 0x80) ? offs % 8 : (offs % 8) + 8);
sx = 496 - sx;
if (flip_screen)
{
sx = 496 - sx;
sy = 240 - sy;
}
drawgfx(background_bitmap, machine->gfx[2],
(bnj_backgroundram[offs] >> 4) + ((offs & 0x80) >> 3) + 32,
0,
flip_screen, flip_screen,
sx, sy,
0, TRANSPARENCY_NONE, 0);
}
/* copy the background bitmap to the screen */
scroll = (bnj_scroll1 & 0x02) * 128 + 511 - bnj_scroll2;
if (!flip_screen)
scroll = 767-scroll;
copyscrollbitmap (bitmap, background_bitmap, 1, &scroll, 0, 0, cliprect,TRANSPARENCY_NONE, 0);
/* copy the low priority characters followed by the sprites
then the high priority characters */
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_PEN, 0, 1);
draw_sprites(machine, bitmap, cliprect, 0, 0, 0, btime_videoram, 0x20);
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_PEN, 0, 0);
}
else
{
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, 0, -1);
draw_sprites(machine, bitmap, cliprect, 0, 0, 0, btime_videoram, 0x20);
}
return 0;
}
VIDEO_UPDATE( cookrace )
{
int offs;
for (offs = bnj_backgroundram_size-1; offs >=0; offs--)
{
int sx,sy;
sx = 31 - (offs / 32);
sy = offs % 32;
if (flip_screen)
{
sx = 31 - sx;
sy = 31 - sy;
}
drawgfx(bitmap, machine->gfx[2],
bnj_backgroundram[offs],
0,
flip_screen, flip_screen,
8*sx,8*sy,
cliprect, TRANSPARENCY_NONE, 0);
}
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_PEN, 0, -1);
draw_sprites(machine, bitmap, cliprect, 0, 1, 0, btime_videoram, 0x20);
return 0;
}
VIDEO_UPDATE( disco )
{
decode_modified(machine, spriteram, 1);
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, btime_palette, -1);
draw_sprites(machine, bitmap, cliprect, btime_palette, 0, 0, spriteram, 1);
return 0;
}
VIDEO_UPDATE( progolf )
{
decode_modified(machine, spriteram, 1);
draw_chars(machine, bitmap, cliprect, TRANSPARENCY_NONE, /*btime_palette*/0, -1);
// draw_sprites(machine, bitmap, cliprect, 0/*btime_palette*/, 0, 0, spriteram, 1);
return 0;
}