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// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
/*************************************************************************
Sega KO Punch
Functions to emulate the video hardware of the machine.
*************************************************************************/
#include "emu.h"
#include "includes/kopunch.h"
void kopunch_state::kopunch_palette(palette_device &palette) const
{
const uint8_t *color_prom = memregion("proms")->base();
color_prom += 24; // first 24 colors are black
for (int i = 0; i < palette.entries(); i++)
{
int bit0, bit1, bit2;
// red component
bit0 = BIT(*color_prom, 0);
bit1 = BIT(*color_prom, 1);
bit2 = BIT(*color_prom, 2);
int const r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// green component
bit0 = BIT(*color_prom, 3);
bit1 = BIT(*color_prom, 4);
bit2 = BIT(*color_prom, 5);
int const g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// blue component
bit0 = 0;
bit1 = BIT(*color_prom, 6);
bit2 = BIT(*color_prom, 7);
int const b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_pen_color(i, rgb_t(r, g, b));
color_prom++;
}
}
void kopunch_state::vram_fg_w(offs_t offset, uint8_t data)
{
m_vram_fg[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset);
}
void kopunch_state::vram_bg_w(offs_t offset, uint8_t data)
{
m_vram_bg[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
void kopunch_state::scroll_x_w(uint8_t data)
{
m_scrollx = data;
m_bg_tilemap->set_scrollx(0, data);
}
void kopunch_state::scroll_y_w(uint8_t data)
{
m_bg_tilemap->set_scrolly(0, data);
}
void kopunch_state::gfxbank_w(uint8_t data)
{
// d0-d2: bg gfx bank
if (m_gfxbank != (data & 0x07))
{
m_gfxbank = data & 0x07;
m_bg_tilemap->mark_all_dirty();
}
// d3: flip y, other bits: N/C
m_bg_tilemap->set_flip((data & 0x08) ? TILEMAP_FLIPY : 0);
}
TILE_GET_INFO_MEMBER(kopunch_state::get_fg_tile_info)
{
int code = m_vram_fg[tile_index];
tileinfo.set(0, code, 0, 0);
}
TILE_GET_INFO_MEMBER(kopunch_state::get_bg_tile_info)
{
// note: highest bit is unused
int code = (m_vram_bg[tile_index] & 0x7f) | m_gfxbank << 7;
tileinfo.set(1, code, 0, 0);
}
void kopunch_state::video_start()
{
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(kopunch_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(kopunch_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 16, 16);
m_fg_tilemap->set_transparent_pen(0);
}
uint32_t kopunch_state::screen_update_kopunch(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
bitmap.fill(0, cliprect);
// background does not wrap around horizontally
rectangle bg_clip = cliprect;
bg_clip.max_x = m_scrollx ^ 0xff;
m_bg_tilemap->draw(screen, bitmap, bg_clip, 0, 0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
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