// license:BSD-3-Clause
// copyright-holders:David Haywood
/* Funny Bubble Video hardware
todo - convert to tilemap
*/
#include "emu.h"
#include "includes/funybubl.h"
WRITE8_MEMBER(funybubl_state::funybubl_paldatawrite)
{
int colchanged ;
uint32_t coldat;
m_paletteram[offset] = data;
colchanged = offset >> 2;
coldat = m_paletteram[colchanged * 4] | (m_paletteram[colchanged * 4 + 1] << 8) |
(m_paletteram[colchanged * 4 + 2] << 16) | (m_paletteram[colchanged * 4 + 3] << 24);
m_palette->set_pen_color(colchanged, pal6bit(coldat >> 12), pal6bit(coldat >> 0), pal6bit(coldat >> 6));
}
void funybubl_state::video_start()
{
}
void funybubl_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
uint8_t *source = &m_banked_vram[0x2000 - 0x20];
uint8_t *finish = source - 0x1000;
while (source > finish)
{
int xpos, ypos, tile;
/* the sprites are in the sprite list twice
the first format (in comments) appears to be a buffer, if you use
this list you get garbage sprites in 2 player mode
the second format (used) seems correct
*/
/*
ypos = 0xff - source[1 + 0x10];
xpos = source[2 + 0x10];
tile = source[0 + 0x10] | ( (source[3 + 0x10] & 0x0f) <<8);
if (source[3 + 0x10] & 0x80) tile += 0x1000;
if (source[3 + 0x10] & 0x20) xpos += 0x100;
// bits 0x40 (not used?) and 0x10 (just set during transition period of x co-ord 0xff and 0x00) ...
xpos -= 8;
ypos -= 14;
*/
ypos = source[2];
xpos = source[3];
tile = source[0] | ( (source[1] & 0x0f) << 8);
if (source[1] & 0x80) tile += 0x1000;
if (source[1] & 0x20)
{
if (xpos < 0xe0)
xpos += 0x100;
}
// bits 0x40 and 0x10 not used?...
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, tile, 0, 0, 0, xpos, ypos, 255);
source -= 0x20;
}
}
uint32_t funybubl_state::screen_update_funybubl(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int x, y, offs;
offs = 0;
bitmap.fill(m_palette->black_pen(), cliprect);
/* tilemap .. convert it .. banking makes it slightly more annoying but still easy */
for (y = 0; y < 32; y++)
{
for (x = 0; x< 64; x++)
{
int data;
data = m_banked_vram[offs] | (m_banked_vram[offs + 1] << 8);
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect, data & 0x7fff, (data & 0x8000) ? 2 : 1, 0, 0, x*8, y*8, 0);
offs += 2;
}
}
draw_sprites(bitmap, cliprect);
#if 0
if ( machine().input().code_pressed_once(KEYCODE_W) )
{
FILE *fp;
fp = fopen("funnybubsprites", "w+b");
if (fp)
{
fwrite(&m_banked_vram[0x1000], 0x1000, 1, fp);
fclose(fp);
}
}
#endif
return 0;
}