// license:BSD-3-Clause // copyright-holders:Nicola Salmoria, Dan Boris /*************************************************************************** snk6502.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/snk6502.h" #include "audio/snk6502.h" #define TOTAL_COLORS(gfxn) (m_gfxdecode->gfx(gfxn)->colors() * m_gfxdecode->gfx(gfxn)->granularity()) #define COLOR(gfxn,offs) (m_gfxdecode->gfx(gfxn)->colorbase() + offs) /*************************************************************************** Convert the color PROMs into a more useable format. Zarzon has a different PROM layout from the others. ***************************************************************************/ PALETTE_INIT_MEMBER(snk6502_state,snk6502) { 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; m_palette_val[i] = rgb_t(r, g, b); color_prom++; } m_backcolor = 0; /* background color can be changed by the game */ for (i = 0; i < TOTAL_COLORS(0); i++) palette.set_pen_color(COLOR(0, i), m_palette_val[i]); for (i = 0; i < TOTAL_COLORS(1); i++) { if (i % 4 == 0) palette.set_pen_color(COLOR(1, i), m_palette_val[4 * m_backcolor + 0x20]); else palette.set_pen_color(COLOR(1, i), m_palette_val[i + 0x20]); } } WRITE8_MEMBER(snk6502_state::videoram_w) { m_videoram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(snk6502_state::videoram2_w) { m_videoram2[offset] = data; m_fg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(snk6502_state::colorram_w) { m_colorram[offset] = data; m_bg_tilemap->mark_tile_dirty(offset); m_fg_tilemap->mark_tile_dirty(offset); } WRITE8_MEMBER(snk6502_state::charram_w) { if (m_charram[offset] != data) { m_charram[offset] = data; m_gfxdecode->gfx(0)->mark_dirty((offset/8) % 256); } } WRITE8_MEMBER(snk6502_state::flipscreen_w) { /* bits 0-2 select background color */ if (m_backcolor != (data & 7)) { m_backcolor = data & 7; for (int i = 0;i < 32;i += 4) m_palette->set_pen_color(COLOR(1, i), m_palette_val[4 * m_backcolor + 0x20]); } /* bit 3 selects char bank */ int bank = (~data & 0x08) >> 3; if (m_charbank != bank) { m_charbank = bank; machine().tilemap().mark_all_dirty(); } /* bit 7 flips screen */ if (flip_screen() != (data & 0x80)) { flip_screen_set(data & 0x80); machine().tilemap().mark_all_dirty(); } } WRITE8_MEMBER(snk6502_state::fantasy_flipscreen_w) { m_sound->fantasy_sound_w(space, offset | 0x03, data, mem_mask); flipscreen_w(space, offset, data, mem_mask); } WRITE8_MEMBER(snk6502_state::scrollx_w) { m_bg_tilemap->set_scrollx(0, data); } WRITE8_MEMBER(snk6502_state::scrolly_w) { m_bg_tilemap->set_scrolly(0, data); } TILE_GET_INFO_MEMBER(snk6502_state::get_bg_tile_info) { int code = m_videoram[tile_index] + 256 * m_charbank; int color = (m_colorram[tile_index] & 0x38) >> 3; SET_TILE_INFO_MEMBER(1, code, color, 0); } TILE_GET_INFO_MEMBER(snk6502_state::get_fg_tile_info) { int code = m_videoram2[tile_index]; int color = m_colorram[tile_index] & 0x07; SET_TILE_INFO_MEMBER(0, code, color, 0); } VIDEO_START_MEMBER(snk6502_state,snk6502) { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(snk6502_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(snk6502_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap->set_transparent_pen(0); m_gfxdecode->gfx(0)->set_source(m_charram); machine().save().register_postload(save_prepost_delegate(FUNC(snk6502_state::postload), this)); } void snk6502_state::postload() { m_gfxdecode->gfx(0)->mark_all_dirty(); } VIDEO_START_MEMBER(snk6502_state,pballoon) { VIDEO_START_CALL_MEMBER( snk6502 ); m_bg_tilemap->set_scrolldy(-16, -16); m_fg_tilemap->set_scrolldy(-16, -16); } uint32_t snk6502_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; } /* Satan of Saturn */ PALETTE_INIT_MEMBER(snk6502_state,satansat) { 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; m_palette_val[i] = rgb_t(r, g, b); color_prom++; } m_backcolor = 0; /* background color can be changed by the game */ for (i = 0; i < TOTAL_COLORS(0); i++) palette.set_pen_color(COLOR(0, i), m_palette_val[4 * (i % 4) + (i / 4)]); for (i = 0; i < TOTAL_COLORS(1); i++) { if (i % 4 == 0) palette.set_pen_color(COLOR(1, i), m_palette_val[m_backcolor + 0x10]); else palette.set_pen_color(COLOR(1, i), m_palette_val[4 * (i % 4) + (i / 4) + 0x10]); } } WRITE8_MEMBER(snk6502_state::satansat_b002_w) { /* bit 0 flips screen */ if (flip_screen() != (data & 0x01)) { flip_screen_set(data & 0x01); machine().tilemap().mark_all_dirty(); } /* bit 1 enables interrupts */ m_irq_mask = data & 2; /* other bits unused */ } WRITE8_MEMBER(snk6502_state::satansat_backcolor_w) { /* bits 0-1 select background color. Other bits unused. */ if (m_backcolor != (data & 0x03)) { m_backcolor = data & 0x03; for (int i = 0; i < 16; i += 4) m_palette->set_pen_color(COLOR(1, i), m_palette_val[m_backcolor + 0x10]); } } TILE_GET_INFO_MEMBER(snk6502_state::satansat_get_bg_tile_info) { int code = m_videoram[tile_index]; int color = (m_colorram[tile_index] & 0x0c) >> 2; SET_TILE_INFO_MEMBER(1, code, color, 0); } TILE_GET_INFO_MEMBER(snk6502_state::satansat_get_fg_tile_info) { int code = m_videoram2[tile_index]; int color = m_colorram[tile_index] & 0x03; SET_TILE_INFO_MEMBER(0, code, color, 0); } VIDEO_START_MEMBER(snk6502_state,satansat) { m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(snk6502_state::satansat_get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(snk6502_state::satansat_get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); m_fg_tilemap->set_transparent_pen(0); m_gfxdecode->gfx(0)->set_source(m_charram); machine().save().register_postload(save_prepost_delegate(FUNC(snk6502_state::postload), this)); }