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// license:BSD-3-Clause
// copyright-holders:Ernesto Corvi
/******************************************************************************
Data East Side Pocket hardware
Functions to emulate the video hardware
******************************************************************************/
#include "emu.h"
#include "includes/sidepckt.h"
void sidepckt_state::sidepckt_palette(palette_device &palette) const
{
uint8_t const *const color_prom = memregion("proms")->base();
for (int i = 0; i < palette.entries(); i++)
{
int bit0, bit1, bit2, bit3;
// red component
bit0 = BIT(color_prom[i], 4);
bit1 = BIT(color_prom[i], 5);
bit2 = BIT(color_prom[i], 6);
bit3 = BIT(color_prom[i], 7);
int const r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
// green component
bit0 = BIT(color_prom[i], 0);
bit1 = BIT(color_prom[i], 1);
bit2 = BIT(color_prom[i], 2);
bit3 = BIT(color_prom[i], 3);
int const g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
// blue component
bit0 = BIT(color_prom[i + palette.entries()], 0);
bit1 = BIT(color_prom[i + palette.entries()], 1);
bit2 = BIT(color_prom[i + palette.entries()], 2);
bit3 = BIT(color_prom[i + palette.entries()], 3);
int const b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
palette.set_pen_color(i, rgb_t(r, g, b));
}
}
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(sidepckt_state::get_tile_info)
{
uint8_t attr = m_colorram[tile_index];
tileinfo.set(0,
m_videoram[tile_index] + ((attr & 0x07) << 8),
((attr & 0x10) >> 3) | ((attr & 0x20) >> 5),
TILE_FLIPX);
tileinfo.group = (attr & 0x80) >> 7;
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void sidepckt_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(sidepckt_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 32,32);
m_bg_tilemap->set_transmask(0,0xff,0x00); /* split type 0 is totally transparent in front half */
m_bg_tilemap->set_transmask(1,0x01,0xfe); /* split type 1 has pen 0 transparent in front half */
machine().tilemap().set_flip_all(TILEMAP_FLIPX);
save_item(NAME(m_scroll_y));
}
/***************************************************************************
Memory handlers
***************************************************************************/
void sidepckt_state::videoram_w(offs_t offset, uint8_t data)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
void sidepckt_state::colorram_w(offs_t offset, uint8_t data)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
uint8_t sidepckt_state::scroll_y_r()
{
return (m_scroll_y);
}
void sidepckt_state::scroll_y_w(uint8_t data)
{
// Bits 0-5: Scroll y
m_scroll_y = data & 0x3F;
// Other bits: Unknown, but they seem never written
if (data > 0x3F)
logerror ("scroll_y_w: Unknown write -> data = 0x%02X\n", data);
}
/***************************************************************************
Display refresh
***************************************************************************/
void sidepckt_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect)
{
for (int offs = 0;offs < m_spriteram.bytes(); offs += 4)
{
int attr = m_spriteram[offs | 1];
int code = ((attr & 0x03) << 8) | m_spriteram[offs | 3];
int color = (attr & 0xf0) >> 4;
int sx = m_spriteram[offs | 2] - 2;
int sy = m_spriteram[offs];
int flipx = attr & 0x08;
int flipy = attr & 0x04;
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code,
color,
flipx,flipy,
sx,sy,0);
/* wraparound */
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code,
color,
flipx,flipy,
sx-256,sy,0);
}
}
uint32_t sidepckt_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->set_scrolly (0, m_scroll_y);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1,0);
draw_sprites(bitmap,cliprect);
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0,0);
return 0;
}
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