mirror of
https://github.com/holub/mame
synced 2025-06-06 12:53:46 +03:00
6ca10ab4fa
except it finds a ROM region instead of a memory share. Unlike the old memory_region_finder, these can be accessed without any overhead (since it's a pointer directly to the data and not to the memory_region object), can be whatever data type you want (no casting needed) and are strictly type-checked--if you have a required_rom_ptr<UINT32> the region has to be a ROM_REGION32 (or an implicitly 32-bit region due to belonging to a CPU) or the finder won't find it and will tell you why. Basically, rom_ptr_finders are strictly better than memory_region_finders and all drivers using the latter should be converted over. I've done megasys1.c and twin16.c as examples. megasys1: Use a device address map for the peekaboo oki instead of memcpy(). twin16: Convert the scrolling layers to tilemaps (the fixed text layer was already one). Miscellaneous cleanups/modernizations. (nw) Notice that rom_ptr_finder has a length() method which returns the length in whatever size unit the pointer is, instead of a bytes() method. Yes, I'm going to convert shared_ptr_finder to match, since this way makes a lot more sense (in particular, mask() is useless for shared_ptrs that are anything other than INT8/UINT8)
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
// license:BSD-3-Clause
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// copyright-holders:Aaron Giles
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/***************************************************************************
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devfind.c
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Device finding template helpers.
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***************************************************************************/
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#include "emu.h"
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//**************************************************************************
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// BASE FINDER CLASS
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//**************************************************************************
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//-------------------------------------------------
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// finder_base - constructor
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//-------------------------------------------------
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finder_base::finder_base(device_t &base, const char *tag)
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: m_next(base.register_auto_finder(*this)),
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m_base(base),
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m_tag(tag)
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{
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}
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//-------------------------------------------------
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// ~finder_base - destructor
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//-------------------------------------------------
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finder_base::~finder_base()
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{
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}
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//-------------------------------------------------
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// find_memregion - find memory region
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//-------------------------------------------------
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void *finder_base::find_memregion(UINT8 width, size_t &length, bool required)
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{
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// look up the region and return NULL if not found
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memory_region *region = m_base.memregion(m_tag);
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if (region == NULL)
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return NULL;
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// check the width and warn if not correct
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if (region->width() != width)
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{
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if (required)
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osd_printf_warning("Region '%s' found but is width %d, not %d as requested\n", m_tag, region->width()*8, width*8);
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return NULL;
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}
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// return results
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length = region->bytes() / width;
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return region->base();
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}
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//-------------------------------------------------
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// find_memshare - find memory share
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//-------------------------------------------------
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void *finder_base::find_memshare(UINT8 width, size_t &bytes, bool required)
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{
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// look up the share and return NULL if not found
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memory_share *share = m_base.memshare(m_tag);
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if (share == NULL)
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return NULL;
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// check the width and warn if not correct
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if (width != 0 && share->width() != width)
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{
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if (required)
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osd_printf_warning("Shared ptr '%s' found but is width %d, not %d as requested\n", m_tag, share->width(), width);
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return NULL;
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}
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// return results
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bytes = share->bytes();
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return share->ptr();
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}
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//-------------------------------------------------
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// report_missing - report missing objects and
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// return true if it's ok
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//-------------------------------------------------
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bool finder_base::report_missing(bool found, const char *objname, bool required)
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{
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if (required && strcmp(m_tag, FINDER_DUMMY_TAG)==0)
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{
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osd_printf_error("Tag not defined for required device\n");
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return false;
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}
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// just pass through in the found case
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if (found)
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return true;
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// otherwise, report
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if (required)
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osd_printf_error("Required %s '%s' not found\n", objname, m_tag);
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else
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osd_printf_verbose("Optional %s '%s' not found\n", objname, m_tag);
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return !required;
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}
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