// license:BSD-3-Clause
// copyright-holders:Ernesto Corvi, Nicola Salmoria
#include "emu.h"
#include "includes/buggychl.h"
void buggychl_state::buggychl_palette(palette_device &palette) const
{
// arbitrary blue shading for the sky, estimation
for (int i = 0; i < 128; i++)
palette.set_pen_color(i + 128, rgb_t(0, 240 - i, 255));
}
void buggychl_state::video_start()
{
m_screen->register_screen_bitmap(m_tmp_bitmap1);
m_screen->register_screen_bitmap(m_tmp_bitmap2);
save_item(NAME(m_tmp_bitmap1));
save_item(NAME(m_tmp_bitmap2));
m_gfxdecode->gfx(0)->set_source(m_charram);
}
WRITE8_MEMBER(buggychl_state::buggychl_chargen_w)
{
if (m_charram[offset] != data)
{
m_charram[offset] = data;
m_gfxdecode->gfx(0)->mark_dirty((offset / 8) & 0xff);
}
}
WRITE8_MEMBER(buggychl_state::buggychl_sprite_lookup_bank_w)
{
m_sl_bank = (data & 0x10) << 8;
}
WRITE8_MEMBER(buggychl_state::buggychl_sprite_lookup_w)
{
m_sprite_lookup[offset + m_sl_bank] = data;
}
WRITE8_MEMBER(buggychl_state::buggychl_ctrl_w)
{
/*
bit7 = lamp
bit6 = lockout
bit4 = OJMODE
bit3 = SKY OFF
bit2 = /SN3OFF
bit1 = HINV
bit0 = VINV
*/
flip_screen_y_set(data & 0x01);
flip_screen_x_set(data & 0x02);
m_bg_clip_on = data & 0x04;
m_sky_on = data & 0x08;
m_sprite_color_base = (data & 0x10) ? 1 * 16 : 3 * 16;
machine().bookkeeping().coin_lockout_global_w((~data & 0x40) >> 6);
m_led[0] = BIT(~data, 7);
}
WRITE8_MEMBER(buggychl_state::buggychl_bg_scrollx_w)
{
m_bg_scrollx = -(data - 0x12);
}
void buggychl_state::draw_sky( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
for (int y = 0; y < 256; y++)
for (int x = 0; x < 256; x++)
bitmap.pix16(y, x) = 128 + x / 2;
}
void buggychl_state::draw_bg( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int offs;
int scroll[256];
/* prevent wraparound */
rectangle clip = cliprect;
// enable clipping if on (title screen disable this to cover all of the area)
if(m_bg_clip_on)
{
if (flip_screen_x()) clip.min_x += 8*8;
else clip.max_x -= 8*8;
}
for (offs = 0; offs < 0x400; offs++)
{
int code = m_videoram[0x400 + offs];
int sx = offs % 32;
int sy = offs / 32;
if (flip_screen_x())
sx = 31 - sx;
if (flip_screen_y())
sy = 31 - sy;
m_gfxdecode->gfx(0)->opaque(m_tmp_bitmap1,m_tmp_bitmap1.cliprect(),
code,
2,
flip_screen_x(),flip_screen_y(),
8*sx,8*sy);
}
/* first copy to a temp bitmap doing column scroll */
for (offs = 0; offs < 256; offs++)
scroll[offs] = -m_scrollv[offs / 8];
copyscrollbitmap(m_tmp_bitmap2, m_tmp_bitmap1, 1, &m_bg_scrollx, 256, scroll, m_tmp_bitmap2.cliprect());
/* then copy to the screen doing row scroll */
for (offs = 0; offs < 256; offs++)
scroll[offs] = -m_scrollh[offs];
copyscrollbitmap_trans(bitmap, m_tmp_bitmap2, 256, scroll, 0, nullptr, clip, 32);
}
void buggychl_state::draw_fg( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int offs;
for (offs = 0; offs < 0x400; offs++)
{
int sx = offs % 32;
int sy = offs / 32;
int flipx = flip_screen_x();
int flipy = flip_screen_y();
int code = m_videoram[offs];
if (flipx)
sx = 31 - sx;
if (flipy)
sy = 31 - sy;
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code,
0,
flipx,flipy,
8*sx,8*sy,
0);
}
}
void buggychl_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int offs;
const uint8_t *gfx;
g_profiler.start(PROFILER_USER1);
gfx = memregion("gfx2")->base();
for (offs = 0; offs < m_spriteram.bytes(); offs += 4)
{
int sx, sy, flipy, zoom, ch, x, px, y;
const uint8_t *lookup;
const uint8_t *zoomx_rom, *zoomy_rom;
sx = m_spriteram[offs + 3] - ((m_spriteram[offs + 2] & 0x80) << 1);
sy = 256 - 64 - m_spriteram[offs] + ((m_spriteram[offs + 1] & 0x80) << 1);
flipy = m_spriteram[offs + 1] & 0x40;
zoom = m_spriteram[offs + 1] & 0x3f;
zoomy_rom = gfx + (zoom << 6);
zoomx_rom = gfx + 0x2000 + (zoom << 3);
lookup = m_sprite_lookup + ((m_spriteram[offs + 2] & 0x7f) << 6);
for (y = 0; y < 64; y++)
{
int dy = flip_screen_y() ? (255 - sy - y) : (sy + y);
if ((dy & ~0xff) == 0)
{
int charline, base_pos;
charline = zoomy_rom[y] & 0x07;
base_pos = zoomy_rom[y] & 0x38;
if (flipy)
base_pos ^= 0x38;
px = 0;
for (ch = 0; ch < 4; ch++)
{
int pos, code, realflipy;
const uint8_t *pendata;
pos = base_pos + 2 * ch;
code = 8 * (lookup[pos] | ((lookup[pos + 1] & 0x07) << 8));
realflipy = (lookup[pos + 1] & 0x80) ? !flipy : flipy;
code += (realflipy ? (charline ^ 7) : charline);
pendata = m_gfxdecode->gfx(1)->get_data(code);
for (x = 0; x < 16; x++)
{
int col = pendata[x];
if (col)
{
int dx = flip_screen_x() ? (255 - sx - px) : (sx + px);
if ((dx & ~0xff) == 0)
bitmap.pix16(dy, dx) = m_sprite_color_base + col;
}
/* the following line is almost certainly wrong */
if (zoomx_rom[7 - (2 * ch + x / 8)] & (1 << (x & 7)))
px++;
}
}
}
}
}
g_profiler.stop();
}
uint32_t buggychl_state::screen_update_buggychl(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_sky_on)
draw_sky(bitmap, cliprect);
else
bitmap.fill(0x20, cliprect); // stage 3 disables sky, wants background pen to be blue
draw_bg(bitmap, cliprect);
draw_sprites(bitmap, cliprect);
draw_fg(bitmap, cliprect);
return 0;
}