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Diffstat (limited to 'src/mame/video/circusc.cpp')
-rw-r--r-- | src/mame/video/circusc.cpp | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/src/mame/video/circusc.cpp b/src/mame/video/circusc.cpp deleted file mode 100644 index fa50b26a0a8..00000000000 --- a/src/mame/video/circusc.cpp +++ /dev/null @@ -1,211 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Nicola Salmoria,Chris Hardy -/*************************************************************************** - - video.c - - Functions to emulate the video hardware of the machine. - -***************************************************************************/ - -#include "emu.h" -#include "video/resnet.h" -#include "includes/circusc.h" - - -/*************************************************************************** - - Convert the color PROMs into a more useable format. - - Circus Charlie 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 circusc_state::circusc_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, 0, 0, - 3, &resistances_rg[0], gweights, 0, 0, - 2, &resistances_b[0], bweights, 0, 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 += 32; - - // characters map to the upper 16 palette entries - for (int i = 0; i < 0x100; i++) - { - uint8_t const ctabentry = color_prom[i] & 0x0f; - palette.set_pen_indirect(i, ctabentry + 0x10); - } - - // sprites map to the lower 16 palette entries - for (int i = 0x100; i < 0x200; i++) - { - uint8_t const ctabentry = color_prom[i] & 0x0f; - palette.set_pen_indirect(i, ctabentry); - } -} - - - -/*************************************************************************** - - Callbacks for the TileMap code - -***************************************************************************/ - -TILE_GET_INFO_MEMBER(circusc_state::get_tile_info) -{ - uint8_t const attr = m_colorram[tile_index]; - tileinfo.category = BIT(attr, 4); - - SET_TILE_INFO_MEMBER( - 0, - m_videoram[tile_index] + ((attr & 0x20) << 3), - attr & 0x0f, - TILE_FLIPYX((attr & 0xc0) >> 6)); -} - - - -/*************************************************************************** - - Start the video hardware emulation. - -***************************************************************************/ - -void circusc_state::video_start() -{ - m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(circusc_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32); - - m_bg_tilemap->set_scroll_cols(32); - - save_item(NAME(m_spritebank)); -} - - - -/*************************************************************************** - - Memory handlers - -***************************************************************************/ - -WRITE8_MEMBER(circusc_state::circusc_videoram_w) -{ - m_videoram[offset] = data; - m_bg_tilemap->mark_tile_dirty(offset); -} - -WRITE8_MEMBER(circusc_state::circusc_colorram_w) -{ - m_colorram[offset] = data; - m_bg_tilemap->mark_tile_dirty(offset); -} - -WRITE_LINE_MEMBER(circusc_state::flipscreen_w) -{ - flip_screen_set(state); -} - -WRITE_LINE_MEMBER(circusc_state::spritebank_w) -{ - m_spritebank = state; -} - - - -/*************************************************************************** - - Display refresh - -***************************************************************************/ - -void circusc_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect ) -{ - int offs; - uint8_t *sr = m_spritebank ? m_spriteram : m_spriteram_2; - - for (offs = 0; offs < m_spriteram.bytes(); offs += 4) - { - int code = sr[offs + 0] + 8 * (sr[offs + 1] & 0x20); - int color = sr[offs + 1] & 0x0f; - int sx = sr[offs + 2]; - int sy = sr[offs + 3]; - int flipx = sr[offs + 1] & 0x40; - int flipy = sr[offs + 1] & 0x80; - - if (flip_screen()) - { - sx = 240 - sx; - sy = 240 - sy; - flipx = !flipx; - flipy = !flipy; - } - - - m_gfxdecode->gfx(1)->transmask(bitmap,cliprect, - code, color, - flipx,flipy, - sx,sy, - m_palette->transpen_mask(*m_gfxdecode->gfx(1), color, 0)); - } -} - -uint32_t circusc_state::screen_update_circusc(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) -{ - int i; - - for (i = 0; i < 10; i++) - m_bg_tilemap->set_scrolly(i, 0); - for (i = 10; i < 32; i++) - m_bg_tilemap->set_scrolly(i, *m_scroll); - - bitmap.fill(0, cliprect); - m_bg_tilemap->draw(screen, bitmap, cliprect, 1, 0); - draw_sprites(bitmap, cliprect); - m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0); - return 0; -} |