// license:BSD-3-Clause // copyright-holders:Phil Stroffolino // thanks-to:Enrique Sanchez /*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/yiear.h" /*************************************************************************** Convert the color PROMs into a more useable format. Yie Ar Kung-Fu has one 32x8 palette PROM, connected to the RGB output this way: bit 7 -- 220 ohm resistor -- BLUE -- 470 ohm resistor -- BLUE -- 220 ohm resistor -- GREEN -- 470 ohm resistor -- GREEN -- 1 kohm resistor -- GREEN -- 220 ohm resistor -- RED -- 470 ohm resistor -- RED bit 0 -- 1 kohm resistor -- RED ***************************************************************************/ PALETTE_INIT_MEMBER(yiear_state, yiear) { const uint8_t *color_prom = memregion("proms")->base(); int i; for (i = 0; i < palette.entries(); i++) { int bit0, bit1, bit2, r, g, b; /* red component */ bit0 = (*color_prom >> 0) & 0x01; bit1 = (*color_prom >> 1) & 0x01; bit2 = (*color_prom >> 2) & 0x01; r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; /* green component */ bit0 = (*color_prom >> 3) & 0x01; bit1 = (*color_prom >> 4) & 0x01; bit2 = (*color_prom >> 5) & 0x01; g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; /* blue component */ bit0 = 0; bit1 = (*color_prom >> 6) & 0x01; bit2 = (*color_prom >> 7) & 0x01; b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; palette.set_pen_color(i, rgb_t(r,g,b)); color_prom++; } } WRITE8_MEMBER(yiear_state::yiear_videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset / 2); } WRITE8_MEMBER(yiear_state::yiear_control_w) { /* bit 0 flips screen */ if (flip_screen() != (data & 0x01)) { flip_screen_set(data & 0x01); machine().tilemap().mark_all_dirty(); } /* bit 1 is NMI enable */ m_yiear_nmi_enable = data & 0x02; /* bit 2 is IRQ enable */ m_yiear_irq_enable = data & 0x04; /* bits 3 and 4 are coin counters */ machine().bookkeeping().coin_counter_w(0, data & 0x08); machine().bookkeeping().coin_counter_w(1, data & 0x10); } TILE_GET_INFO_MEMBER(yiear_state::get_bg_tile_info) { int offs = tile_index * 2; int attr = m_videoram[offs]; int code = m_videoram[offs + 1] | ((attr & 0x10) << 4); // int color = (attr & 0xf0) >> 4; int flags = ((attr & 0x80) ? TILE_FLIPX : 0) | ((attr & 0x40) ? TILE_FLIPY : 0); SET_TILE_INFO_MEMBER(0, code, 0, flags); } void yiear_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(yiear_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); } void yiear_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) { uint8_t *spriteram = m_spriteram; uint8_t *spriteram_2 = m_spriteram2; int offs; for (offs = m_spriteram.bytes() - 2; offs >= 0; offs -= 2) { int attr = spriteram[offs]; int code = spriteram_2[offs + 1] + 256 * (attr & 0x01); int color = 0; int flipx = ~attr & 0x40; int flipy = attr & 0x80; int sy = 240 - spriteram[offs + 1]; int sx = spriteram_2[offs]; if (flip_screen()) { sy = 240 - sy; flipy = !flipy; } if (offs < 0x26) { sy++; /* fix title screen & garbage at the bottom of the screen */ } m_gfxdecode->gfx(1)->transpen(bitmap,cliprect, code, color, flipx, flipy, sx, sy, 0); } } uint32_t yiear_state::screen_update_yiear(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); return 0; }