// license:BSD-3-Clause // copyright-holders:Manuel Abadia #include "emu.h" #include "includes/pandoras.h" #include "video/resnet.h" /*********************************************************************** Convert the color PROMs into a more useable format. Pandora's Palace has one 32x8 palette PROM and two 256x4 lookup table PROMs (one for characters, one for sprites). The palette PROM is 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 ***************************************************************************/ void pandoras_state::pandoras_palette(palette_device &palette) const { const uint8_t *color_prom = memregion("proms")->base(); static constexpr int resistances_rg[3] = { 1000, 470, 220 }; static constexpr int resistances_b [2] = { 470, 220 }; // compute the color output resistor weights double rweights[3], gweights[3], bweights[2]; compute_resistor_weights(0, 255, -1.0, 3, &resistances_rg[0], rweights, 1000, 0, 3, &resistances_rg[0], gweights, 1000, 0, 2, &resistances_b[0], bweights, 1000, 0); // create a lookup table for the palette for (int i = 0; i < 0x20; 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(rweights, 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(gweights, bit0, bit1, bit2); // blue component bit0 = BIT(color_prom[i], 6); bit1 = BIT(color_prom[i], 7); int const b = combine_weights(bweights, bit0, bit1); palette.set_indirect_color(i, rgb_t(r, g, b)); } // color_prom now points to the beginning of the lookup table color_prom += 0x20; // sprites for (int i = 0; i < 0x100; i++) { uint8_t const ctabentry = color_prom[i] & 0x0f; palette.set_pen_indirect(i, ctabentry); } // characters for (int i = 0x100; i < 0x200; i++) { uint8_t const ctabentry = (color_prom[i] & 0x0f) | 0x10; palette.set_pen_indirect(i, ctabentry); } } /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ TILE_GET_INFO_MEMBER(pandoras_state::get_tile_info0) { uint8_t attr = m_colorram[tile_index]; SET_TILE_INFO_MEMBER(1, m_videoram[tile_index] + ((attr & 0x10) << 4), attr & 0x0f, TILE_FLIPYX((attr & 0xc0) >> 6)); tileinfo.category = (attr & 0x20) >> 5; } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void pandoras_state::video_start() { m_layer0 = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(pandoras_state::get_tile_info0)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); save_item(NAME(m_flipscreen)); } /*************************************************************************** Memory Handlers ***************************************************************************/ WRITE8_MEMBER(pandoras_state::pandoras_vram_w) { m_layer0->mark_tile_dirty(offset); m_videoram[offset] = data; } WRITE8_MEMBER(pandoras_state::pandoras_cram_w) { m_layer0->mark_tile_dirty(offset); m_colorram[offset] = data; } WRITE8_MEMBER(pandoras_state::pandoras_scrolly_w) { m_layer0->set_scrolly(0, data); } WRITE_LINE_MEMBER(pandoras_state::flipscreen_w) { m_flipscreen = state; machine().tilemap().set_flip_all(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0); } /*************************************************************************** Screen Refresh ***************************************************************************/ void pandoras_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect, uint8_t* sr ) { int offs; for (offs = 0; offs < 0x100; offs += 4) { int sx = sr[offs + 1]; int sy = 240 - sr[offs]; int color = sr[offs + 3] & 0x0f; int nflipx = sr[offs + 3] & 0x40; int nflipy = sr[offs + 3] & 0x80; m_gfxdecode->gfx(0)->transmask(bitmap,cliprect, sr[offs + 2], color, !nflipx,!nflipy, sx,sy, m_palette->transpen_mask(*m_gfxdecode->gfx(0), color, 0)); } } uint32_t pandoras_state::screen_update_pandoras(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { m_layer0->draw(screen, bitmap, cliprect, 1 ,0); draw_sprites(bitmap, cliprect, &m_spriteram[0x800] ); m_layer0->draw(screen, bitmap, cliprect, 0 ,0); return 0; }