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Diffstat (limited to 'src/mame/valadon/bagman_v.cpp')
-rw-r--r-- | src/mame/valadon/bagman_v.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/mame/valadon/bagman_v.cpp b/src/mame/valadon/bagman_v.cpp new file mode 100644 index 00000000000..82c819ea83c --- /dev/null +++ b/src/mame/valadon/bagman_v.cpp @@ -0,0 +1,143 @@ +// license:BSD-3-Clause +// copyright-holders:Nicola Salmoria +/*************************************************************************** + + bagman.cpp + + Functions to emulate the video hardware of the machine. + +***************************************************************************/ + +#include "emu.h" +#include "video/resnet.h" +#include "bagman.h" + + +void bagman_state::videoram_w(offs_t offset, uint8_t data) +{ + m_videoram[offset] = data; + m_bg_tilemap->mark_tile_dirty(offset); +} + +void bagman_state::colorram_w(offs_t offset, uint8_t data) +{ + 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)); + } +} + +void bagman_state::video_enable_w(int state) +{ + 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; + + tileinfo.set(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; +} |