// license:BSD-3-Clause // copyright-holders:Nicola Salmoria /*************************************************************************** bagman.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "video/resnet.h" #include "includes/bagman.h" WRITE8_MEMBER(bagman_state::videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(bagman_state::colorram_w) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } /*************************************************************************** Convert the color PROMs into a more useable format. Bagman has two 32 bytes palette PROMs, connected to the RGB output this way: bit 7 -- 220 ohm resistor -- \ -- 470 ohm resistor -- | -- 470 ohm pulldown resistor -- BLUE -- 220 ohm resistor -- \ -- 470 ohm resistor -- | -- 470 ohm pulldown resistor -- GREEN -- 1 kohm resistor -- / -- 220 ohm resistor -- \ -- 470 ohm resistor -- | -- 470 ohm pulldown resistor -- RED bit 0 -- 1 kohm resistor -- / ***************************************************************************/ void bagman_state::bagman_palette(palette_device &palette) const { static constexpr int resistances_rg[3] = { 1000, 470, 220 }; static constexpr int resistances_b [2] = { 470, 220 }; double weights_r[3], weights_g[3], weights_b[2]; compute_resistor_weights(0, 255, -1.0, 3, resistances_rg, weights_r, 470, 0, 3, resistances_rg, weights_g, 470, 0, 2, resistances_b, weights_b, 470, 0); uint8_t const *const color_prom = memregion("proms")->base(); for (int i = 0; i < palette.entries(); i++) { int bit0, bit1, bit2; // red component bit0 = BIT(color_prom[i], 0); bit1 = BIT(color_prom[i], 1); bit2 = BIT(color_prom[i], 2); int const r = combine_weights(weights_r, bit0, bit1, bit2); // green component bit0 = BIT(color_prom[i], 3); bit1 = BIT(color_prom[i], 4); bit2 = BIT(color_prom[i], 5); int const g = combine_weights(weights_g, bit0, bit1, bit2); // blue component bit0 = BIT(color_prom[i], 6); bit1 = BIT(color_prom[i], 7); int const b = combine_weights(weights_b, bit0, bit1); palette.set_pen_color(i, rgb_t(r, g, b)); } } WRITE_LINE_MEMBER(bagman_state::flipscreen_x_w) { flip_screen_x_set(state); } WRITE_LINE_MEMBER(bagman_state::flipscreen_y_w) { flip_screen_y_set(state); } WRITE_LINE_MEMBER(bagman_state::video_enable_w) { m_video_enable = state; } TILE_GET_INFO_MEMBER(bagman_state::get_bg_tile_info) { int gfxbank = (m_gfxdecode->gfx(2) && (m_colorram[tile_index] & 0x10)) ? 2 : 0; int code = m_videoram[tile_index] + 8 * (m_colorram[tile_index] & 0x20); int color = m_colorram[tile_index] & 0x0f; SET_TILE_INFO_MEMBER(gfxbank, code, color, 0); } void bagman_state::video_start() { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(bagman_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); } void bagman_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect) { // Spriteram is at the start of the colorram for (int offs = 0x20 - 4;offs >= 0;offs -= 4) { int sx,sy,flipx,flipy; sx = m_colorram[offs + 3]; sy = 256 - m_colorram[offs + 2] - 16; flipx = m_colorram[offs] & 0x40; flipy = m_colorram[offs] & 0x80; if (flip_screen()) { sx = 256 - sx - 15; sy = 255 - sy - 15; flipx = !flipx; flipy = !flipy; } if (m_colorram[offs + 2] && m_colorram[offs + 3]) m_gfxdecode->gfx(1)->transpen(bitmap, cliprect, (m_colorram[offs] & 0x3f) + 2 * (m_colorram[offs + 1] & 0x20), m_colorram[offs + 1] & 0x1f, flipx,flipy, sx,sy,0); } } uint32_t bagman_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { bitmap.fill(0, cliprect); if (!m_video_enable) return 0; m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); draw_sprites(bitmap, cliprect); return 0; }