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-rw-r--r--src/mame/valadon/bagman_v.cpp143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/mame/valadon/bagman_v.cpp b/src/mame/valadon/bagman_v.cpp
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+++ b/src/mame/valadon/bagman_v.cpp
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+// 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;
+}