mirror of
https://github.com/holub/mame
synced 2025-06-06 04:43:45 +03:00
513 lines
14 KiB
C++
513 lines
14 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Aaron Giles
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/***************************************************************************
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dipalette.cpp
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Device palette interface.
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***************************************************************************/
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#include "emu.h"
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#include "screen.h"
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#define VERBOSE 0
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//**************************************************************************
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// DEVICE INTERFACE MANAGEMENT
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//**************************************************************************
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//-------------------------------------------------
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// device_palette_interface - constructor
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//-------------------------------------------------
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device_palette_interface::device_palette_interface(const machine_config &mconfig, device_t &device)
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: device_interface(device, "palette"),
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m_palette(nullptr),
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m_pens(nullptr),
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m_format(BITMAP_FORMAT_RGB32),
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m_shadow_table(nullptr),
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m_shadow_group(0),
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m_hilight_group(0),
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m_white_pen(0),
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m_black_pen(0)
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{
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}
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//-------------------------------------------------
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// interface_validity_check - validation for a
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// device after the configuration has been
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// constructed
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//-------------------------------------------------
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void device_palette_interface::interface_validity_check(validity_checker &valid) const
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{
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// this info must be available before the device has started
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if (palette_entries() == 0)
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osd_printf_error("Palette has no entries specified\n");
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}
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//-------------------------------------------------
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// interface_pre_start - work to be done prior to
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// actually starting a device
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//-------------------------------------------------
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void device_palette_interface::interface_pre_start()
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{
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// allocate the palette
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u32 numentries = palette_entries();
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allocate_palette(numentries);
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allocate_color_tables();
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allocate_shadow_tables();
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// allocate indirection tables
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int indirect_colors = palette_indirect_entries();
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if (indirect_colors > 0)
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{
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m_indirect_colors.resize(indirect_colors);
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for (int color = 0; color < indirect_colors; color++)
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{
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// alpha = 0 ensures change is detected the first time set_indirect_color() is called
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m_indirect_colors[color] = rgb_t::transparent();
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}
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m_indirect_pens.resize(numentries);
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for (int pen = 0; pen < numentries; pen++)
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m_indirect_pens[pen] = pen % indirect_colors;
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}
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}
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//-------------------------------------------------
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// interface_post_start - work to be done after
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// actually starting a device
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//-------------------------------------------------
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void device_palette_interface::interface_post_start()
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{
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// set up save/restore of the palette
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m_save_pen.resize(m_palette->num_colors());
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m_save_contrast.resize(m_palette->num_colors());
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device().save_item(NAME(m_save_pen));
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device().save_item(NAME(m_save_contrast));
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// save indirection tables if we have them
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if (m_indirect_colors.size() > 0)
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{
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device().save_item(NAME(m_indirect_colors));
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device().save_item(NAME(m_indirect_pens));
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}
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}
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//-------------------------------------------------
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// interface_pre_save - prepare the save arrays
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// for saving
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//-------------------------------------------------
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void device_palette_interface::interface_pre_save()
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{
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// fill the save arrays with updated pen and brightness information
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int numcolors = m_palette->num_colors();
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for (int index = 0; index < numcolors; index++)
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{
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m_save_pen[index] = pen_color(index);
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m_save_contrast[index] = pen_contrast(index);
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}
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}
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//-------------------------------------------------
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// interface_post_load - called after restore to
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// actually update the palette
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//-------------------------------------------------
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void device_palette_interface::interface_post_load()
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{
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// reset the pen and brightness for each entry
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int numcolors = m_palette->num_colors();
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for (int index = 0; index < numcolors; index++)
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{
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set_pen_color(index, m_save_pen[index]);
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set_pen_contrast(index, m_save_contrast[index]);
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}
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}
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//-------------------------------------------------
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// interface_post_stop - final cleanup
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//-------------------------------------------------
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void device_palette_interface::interface_post_stop()
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{
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// dereference the palette
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if (m_palette != nullptr)
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m_palette->deref();
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}
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//**************************************************************************
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// INDIRECTION (AKA COLORTABLES)
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//**************************************************************************
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//-------------------------------------------------
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// set_indirect_color - set an indirect color
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//-------------------------------------------------
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void device_palette_interface::set_indirect_color(int index, rgb_t rgb)
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{
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// make sure we are in range
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assert(index < m_indirect_colors.size());
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// alpha doesn't matter
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rgb.set_a(255);
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// update if it has changed
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if (m_indirect_colors[index] != rgb)
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{
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m_indirect_colors[index] = rgb;
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// update the palette for any colortable entries that reference it
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for (u32 pen = 0; pen < m_indirect_pens.size(); pen++)
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if (m_indirect_pens[pen] == index)
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m_palette->entry_set_color(pen, rgb);
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}
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}
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//-------------------------------------------------
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// set_pen_indirect - set an indirect pen index
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//-------------------------------------------------
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void device_palette_interface::set_pen_indirect(pen_t pen, indirect_pen_t index)
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{
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// make sure we are in range
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assert(pen < entries() && index < indirect_entries());
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m_indirect_pens[pen] = index;
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m_palette->entry_set_color(pen, m_indirect_colors[index]);
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}
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//-------------------------------------------------
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// transpen_mask - return a mask of pens that
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// whose indirect values match the given
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// transcolor
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//-------------------------------------------------
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u32 device_palette_interface::transpen_mask(gfx_element &gfx, u32 color, indirect_pen_t transcolor) const
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{
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u32 entry = gfx.colorbase() + (color % gfx.colors()) * gfx.granularity();
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// make sure we are in range
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assert(entry < m_indirect_pens.size());
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assert(gfx.depth() <= 32);
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// either gfx->color_depth entries or as many as we can get up until the end
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int count = std::min(size_t(gfx.depth()), m_indirect_pens.size() - entry);
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// set a bit anywhere the transcolor matches
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u32 mask = 0;
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for (int bit = 0; bit < count; bit++)
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if (m_indirect_pens[entry++] == transcolor)
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mask |= 1 << bit;
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// return the final mask
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return mask;
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}
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//**************************************************************************
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// SHADOW TABLE CONFIGURATION
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//**************************************************************************
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//-------------------------------------------------
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// palette_set_shadow_mode(mode)
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//
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// mode: 0 = use preset 0 (default shadow)
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// 1 = use preset 1 (default highlight)
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// 2 = use preset 2 *
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// 3 = use preset 3 *
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//
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// * Preset 2 & 3 work independently under 32bpp,
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// supporting up to four different types of
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// shadows at one time. They mirror preset 1 & 2
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// in lower depth settings to maintain
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// compatibility.
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//
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//
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// set_shadow_dRGB32(mode, dr, dg, db, noclip)
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//
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// mode: 0 to 3 (which preset to configure)
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//
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// dr: -255 to 255 ( red displacement )
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// dg: -255 to 255 ( green displacement )
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// db: -255 to 255 ( blue displacement )
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//
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// noclip: 0 = resultant RGB clipped at 0x00/0xff
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// 1 = resultant RGB wraparound 0x00/0xff
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//
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//
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// * Color shadows only work under 32bpp.
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// This function has no effect in lower color
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// depths where
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//
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// set_shadow_factor() or
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// set_highlight_factor()
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//
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// should be used instead.
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//
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// * 32-bit shadows are lossy. Even with zero RGB
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// displacements the affected area will still look
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// slightly darkened.
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//
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// Drivers should ensure all shadow pens in
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// gfx_drawmode_table[] are set to DRAWMODE_NONE
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// when RGB displacements are zero to avoid the
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// darkening effect.
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//-------------------------------------------------
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//-------------------------------------------------
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// set_shadow_dRGB32 - configure delta RGB values
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// for 1 of 4 shadow tables
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//-------------------------------------------------
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void device_palette_interface::set_shadow_dRGB32(int mode, int dr, int dg, int db, bool noclip)
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{
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shadow_table_data &stable = m_shadow_tables[mode];
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// only applies to RGB direct modes
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assert(m_format != BITMAP_FORMAT_IND16);
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assert(stable.base != nullptr);
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// clamp the deltas (why?)
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if (dr < -0xff) dr = -0xff; else if (dr > 0xff) dr = 0xff;
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if (dg < -0xff) dg = -0xff; else if (dg > 0xff) dg = 0xff;
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if (db < -0xff) db = -0xff; else if (db > 0xff) db = 0xff;
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// early exit if nothing changed
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if (dr == stable.dr && dg == stable.dg && db == stable.db && noclip == stable.noclip)
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return;
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stable.dr = dr;
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stable.dg = dg;
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stable.db = db;
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stable.noclip = noclip;
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if (VERBOSE)
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device().popmessage("shadow %d recalc %d %d %d %02x", mode, dr, dg, db, noclip);
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// regenerate the table
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for (int i = 0; i < 32768; i++)
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{
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int r = pal5bit(i >> 10) + dr;
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int g = pal5bit(i >> 5) + dg;
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int b = pal5bit(i >> 0) + db;
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// apply clipping
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if (!noclip)
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{
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r = rgb_t::clamp(r);
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g = rgb_t::clamp(g);
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b = rgb_t::clamp(b);
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}
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rgb_t final = rgb_t(r, g, b);
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// store either 16 or 32 bit
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if (m_format == BITMAP_FORMAT_RGB32)
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stable.base[i] = final;
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else
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stable.base[i] = final.as_rgb15();
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}
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}
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//**************************************************************************
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// INTERNAL FUNCTIONS
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//**************************************************************************
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//-------------------------------------------------
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// allocate_palette - allocate and configure the
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// palette object itself
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//-------------------------------------------------
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void device_palette_interface::allocate_palette(u32 numentries)
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{
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assert(numentries > 0);
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// determine the number of groups we need
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int numgroups = 1;
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if (palette_shadows_enabled())
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m_shadow_group = numgroups++;
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if (palette_hilights_enabled())
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m_hilight_group = numgroups++;
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assert_always(numentries * numgroups <= 65536, "Palette has more than 65536 colors.");
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// allocate a palette object containing all the colors and groups
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m_palette = palette_t::alloc(numentries, numgroups);
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// configure the groups
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if (m_shadow_group != 0)
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set_shadow_factor(PALETTE_DEFAULT_SHADOW_FACTOR);
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if (m_hilight_group != 0)
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set_highlight_factor(PALETTE_DEFAULT_HIGHLIGHT_FACTOR);
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// set the initial colors to a standard rainbow
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for (int index = 0; index < numentries; index++)
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set_pen_color(index, rgbexpand<1,1,1>(index, 0, 1, 2));
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// switch off the color mode
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switch (m_format)
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{
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// 16-bit paletteized case
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case BITMAP_FORMAT_IND16:
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m_black_pen = m_palette->black_entry();
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m_white_pen = m_palette->white_entry();
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if (m_black_pen >= 65536)
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m_black_pen = 0;
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if (m_white_pen >= 65536)
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m_white_pen = 65535;
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break;
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// 32-bit direct case
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case BITMAP_FORMAT_RGB32:
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m_black_pen = rgb_t::black();
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m_white_pen = rgb_t::white();
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break;
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// screenless case
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case BITMAP_FORMAT_INVALID:
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default:
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break;
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}
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}
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//-------------------------------------------------
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// allocate_color_tables - allocate memory for
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// pen and color tables
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//-------------------------------------------------
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void device_palette_interface::allocate_color_tables()
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{
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int total_colors = m_palette->num_colors() * m_palette->num_groups();
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// allocate memory for the pen table
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switch (m_format)
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{
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case BITMAP_FORMAT_IND16:
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// create a dummy 1:1 mapping
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{
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m_pen_array.resize(total_colors + 2);
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pen_t *pentable = &m_pen_array[0];
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m_pens = &m_pen_array[0];
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for (int i = 0; i < total_colors + 2; i++)
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pentable[i] = i;
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}
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break;
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case BITMAP_FORMAT_RGB32:
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m_pens = reinterpret_cast<const pen_t *>(m_palette->entry_list_adjusted());
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break;
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default:
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m_pens = nullptr;
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break;
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}
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}
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//-------------------------------------------------
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// allocate_shadow_tables - allocate memory for
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// shadow tables
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//-------------------------------------------------
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void device_palette_interface::allocate_shadow_tables()
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{
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int numentries = m_palette->num_colors();
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// if we have shadows, allocate shadow tables
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if (m_shadow_group != 0)
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{
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m_shadow_array.resize(65536);
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// palettized mode gets a single 64k table in slots 0 and 2
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if (m_format == BITMAP_FORMAT_IND16)
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{
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m_shadow_tables[0].base = m_shadow_tables[2].base = &m_shadow_array[0];
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for (int i = 0; i < 65536; i++)
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m_shadow_array[i] = (i < numentries) ? (i + numentries) : i;
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}
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// RGB mode gets two 32k tables in slots 0 and 2
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else
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{
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m_shadow_tables[0].base = &m_shadow_array[0];
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m_shadow_tables[2].base = &m_shadow_array[32768];
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configure_rgb_shadows(0, PALETTE_DEFAULT_SHADOW_FACTOR);
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}
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}
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// if we have hilights, allocate shadow tables
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if (m_hilight_group != 0)
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{
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m_hilight_array.resize(65536);
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// palettized mode gets a single 64k table in slots 1 and 3
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if (m_format == BITMAP_FORMAT_IND16)
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{
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m_shadow_tables[1].base = m_shadow_tables[3].base = &m_hilight_array[0];
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for (int i = 0; i < 65536; i++)
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m_hilight_array[i] = (i < numentries) ? (i + 2 * numentries) : i;
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}
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// RGB mode gets two 32k tables in slots 1 and 3
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else
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{
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m_shadow_tables[1].base = &m_hilight_array[0];
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m_shadow_tables[3].base = &m_hilight_array[32768];
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configure_rgb_shadows(1, PALETTE_DEFAULT_HIGHLIGHT_FACTOR);
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}
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}
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// set the default table
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m_shadow_table = m_shadow_tables[0].base;
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}
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//-------------------------------------------------
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// configure_rgb_shadows - configure shadows
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// for the RGB tables
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//-------------------------------------------------
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void device_palette_interface::configure_rgb_shadows(int mode, float factor)
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{
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// only applies to RGB direct modes
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assert(m_format != BITMAP_FORMAT_IND16);
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// verify the shadow table
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assert(mode >= 0 && mode < ARRAY_LENGTH(m_shadow_tables));
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shadow_table_data &stable = m_shadow_tables[mode];
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assert(stable.base != nullptr);
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// regenerate the table
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int ifactor = int(factor * 256.0f);
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for (int rgb555 = 0; rgb555 < 32768; rgb555++)
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{
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u8 const r = rgb_t::clamp((pal5bit(rgb555 >> 10) * ifactor) >> 8);
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u8 const g = rgb_t::clamp((pal5bit(rgb555 >> 5) * ifactor) >> 8);
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u8 const b = rgb_t::clamp((pal5bit(rgb555 >> 0) * ifactor) >> 8);
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// store either 16 or 32 bit
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rgb_t final = rgb_t(r, g, b);
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if (m_format == BITMAP_FORMAT_RGB32)
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stable.base[rgb555] = final;
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else
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stable.base[rgb555] = final.as_rgb15();
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}
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}
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