// license:BSD-3-Clause // copyright-holders:Nicola Salmoria /*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/gundealr.h" /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(gundealr_state::get_bg_tile_info) { uint8_t attr = m_bg_videoram[2 * tile_index + 1]; SET_TILE_INFO_MEMBER(0, m_bg_videoram[2 * tile_index] + ((attr & 0x07) << 8), (attr & 0xf0) >> 4, 0); } TILEMAP_MAPPER_MEMBER(gundealr_state::pagescan) { /* logical (col,row) -> memory offset */ return (row & 0x0f) + ((col & 0x3f) << 4) + ((row & 0x10) << 6); } TILE_GET_INFO_MEMBER(gundealr_state::get_fg_tile_info) { uint8_t attr = m_fg_videoram[2 * tile_index + 1]; SET_TILE_INFO_MEMBER(1, m_fg_videoram[2 * tile_index] + ((attr & 0x03) << 8), (attr & 0xf0) >> 4, 0); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void gundealr_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(gundealr_state::get_bg_tile_info)), TILEMAP_SCAN_COLS, 8, 8, 32, 32); m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(gundealr_state::get_fg_tile_info)), tilemap_mapper_delegate(*this, FUNC(gundealr_state::pagescan)), 16, 16, 64, 32); m_fg_tilemap->set_transparent_pen(15); } /*************************************************************************** Memory handlers ***************************************************************************/ WRITE8_MEMBER(gundealr_state::bg_videoram_w) { m_bg_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset / 2); } WRITE8_MEMBER(gundealr_state::fg_videoram_w) { m_fg_videoram[offset] = data; m_fg_tilemap->mark_tile_dirty(offset / 2); } WRITE8_MEMBER(gundealr_state::paletteram_w) { int r,g,b,val; m_paletteram[offset] = data; val = m_paletteram[offset & ~1]; r = (val >> 4) & 0x0f; g = (val >> 0) & 0x0f; val = m_paletteram[offset | 1]; b = (val >> 4) & 0x0f; /* TODO: the bottom 4 bits are used as well, but I'm not sure about the meaning */ m_palette->set_pen_color(offset / 2, pal4bit(r), pal4bit(g), pal4bit(b)); } /*************************************************************************** Display refresh ***************************************************************************/ uint32_t gundealr_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0); return 0; }