// license:BSD-3-Clause // copyright-holders:Manuel Abadia /*************************************************************************** Target Hits Video Hardware Functions to emulate the video hardware of the machine ***************************************************************************/ #include "emu.h" #include "includes/targeth.h" /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ /* Tile format ----------- Screen 0 & 1: (64*32, 16x16 tiles) Word | Bit(s) | Description -----+-FEDCBA98-76543210-+-------------------------- 0 | --xxxxxx xxxxxxxx | code 0 | xx------ -------- | not used? 1 | -------- ---xxxxx | color (uses 1st half of the palette) 1 | -------- --x----- | flip y 1 | -------- -x------ | flip x 1 | xxxxxxxx x------- | not used? */ template TILE_GET_INFO_MEMBER(targeth_state::get_tile_info) { int data = m_videoram[(Layer * 0x2000/2) + (tile_index << 1)]; int data2 = m_videoram[(Layer * 0x2000/2) + (tile_index << 1) + 1]; int code = data & 0x3fff; SET_TILE_INFO_MEMBER(0, code, data2 & 0x1f, TILE_FLIPXY((data2 >> 5) & 0x03)); } /*************************************************************************** Memory Handlers ***************************************************************************/ WRITE16_MEMBER(targeth_state::vram_w) { m_videoram[offset] = data; m_pant[(offset & 0x1fff) >> 12]->mark_tile_dirty(((offset << 1) & 0x1fff) >> 2); } /*************************************************************************** Start/Stop the video hardware emulation. ***************************************************************************/ void targeth_state::video_start() { m_pant[0] = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(targeth_state::get_tile_info<0>)), TILEMAP_SCAN_ROWS, 16,16, 64,32); m_pant[1] = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(targeth_state::get_tile_info<1>)), TILEMAP_SCAN_ROWS, 16,16, 64,32); m_pant[0]->set_transparent_pen(0); } /*************************************************************************** Sprites ***************************************************************************/ /* Sprite Format ------------- Word | Bit(s) | Description -----+-FEDCBA98-76543210-+-------------------------- 0 | -------- xxxxxxxx | y position 0 | --xxxxxx -------- | not used? 0 | -x------ -------- | flipx 0 | x------- -------- | flipy 1 | xxxxxxxx xxxxxxxx | not used? 2 | ------xx xxxxxxxx | x position 2 | -xxxxx-- -------- | sprite color (uses 2nd half of the palette) 3 | --xxxxxx xxxxxxxx | sprite code 3 | xx------ -------- | not used? */ void targeth_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect) { gfx_element *gfx = m_gfxdecode->gfx(0); for (int i = 3; i < (0x1000 - 6)/2; i += 4){ int sx = m_spriteram[i+2] & 0x03ff; int sy = (240 - (m_spriteram[i] & 0x00ff)) & 0x00ff; int number = m_spriteram[i+3] & 0x3fff; int color = (m_spriteram[i+2] & 0x7c00) >> 10; int attr = (m_spriteram[i] & 0xfe00) >> 9; int xflip = attr & 0x20; int yflip = attr & 0x40; gfx->transpen(bitmap,cliprect,number, 0x20 + color,xflip,yflip, sx - 0x0f,sy,0); } } /*************************************************************************** Display Refresh ***************************************************************************/ uint32_t targeth_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { /* set scroll registers */ m_pant[0]->set_scrolly(0, m_vregs[0]); m_pant[0]->set_scrollx(0, m_vregs[1] + 0x04); m_pant[1]->set_scrolly(0, m_vregs[2]); m_pant[1]->set_scrollx(0, m_vregs[3]); m_pant[1]->draw(screen, bitmap, cliprect, 0,0); m_pant[0]->draw(screen, bitmap, cliprect, 0,0); draw_sprites(bitmap,cliprect); return 0; }