// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** divideo.c Device video interfaces. ***************************************************************************/ #include "emu.h" const char device_video_interface::s_unconfigured_screen_tag[] = "!!UNCONFIGURED!!"; //************************************************************************** // DEVICE VIDEO INTERFACE //************************************************************************** //------------------------------------------------- // device_video_interface - constructor //------------------------------------------------- device_video_interface::device_video_interface(const machine_config &mconfig, device_t &device, bool screen_required) : device_interface(device, "video"), m_screen_required(screen_required), m_screen_tag(s_unconfigured_screen_tag), m_screen(nullptr) { } //------------------------------------------------- // ~device_video_interface - destructor //------------------------------------------------- device_video_interface::~device_video_interface() { } //------------------------------------------------- // static_add_route - configuration helper to add // a new route to the device //------------------------------------------------- void device_video_interface::static_set_screen(device_t &device, const char *tag) { // find our video interface device_video_interface *video; if (!device.interface(video)) throw emu_fatalerror("MCFG_VIDEO_SET_SCREEN called on device '%s' with no video interface", device.tag()); video->m_screen_tag = tag; } //------------------------------------------------- // interface_validity_check - validation for a // device after the configuration has been // constructed //------------------------------------------------- void device_video_interface::interface_validity_check(validity_checker &valid) const { // only look up screens if we haven't explicitly requested no screen screen_device *screen = nullptr; if (m_screen_tag != nullptr) { // find the screen device if explicitly configured if (strcmp(m_screen_tag, s_unconfigured_screen_tag) != 0) { screen = device().siblingdevice(m_screen_tag); if (screen == nullptr) osd_printf_error("Screen '%s' not found, explicitly set for device '%s'\n", m_screen_tag, device().tag()); } // otherwise, look for a single match else { screen_device_iterator iter(device().mconfig().root_device()); screen = iter.first(); if (iter.count() > 1) osd_printf_error("No screen specified for device '%s', but multiple screens found\n", device().tag()); } } // error if no screen is found if (screen == nullptr && m_screen_required) osd_printf_error("Device '%s' requires a screen\n", device().tag()); } //------------------------------------------------- // interface_pre_start - make sure all our input // devices are started //------------------------------------------------- void device_video_interface::interface_pre_start() { // only look up screens if we haven't explicitly requested no screen if (m_screen_tag != nullptr) { // find the screen device if explicitly configured if (strcmp(m_screen_tag, s_unconfigured_screen_tag) != 0) { m_screen = device().siblingdevice(m_screen_tag); if (m_screen == nullptr) throw emu_fatalerror("Screen '%s' not found, explicitly set for device '%s'", m_screen_tag, device().tag()); } // otherwise, look for a single match else { screen_device_iterator iter(device().machine().root_device()); m_screen = iter.first(); if (iter.count() > 1) throw emu_fatalerror("No screen specified for device '%s', but multiple screens found", device().tag()); } } // fatal error if no screen is found if (m_screen == nullptr && m_screen_required) throw emu_fatalerror("Device '%s' requires a screen", device().tag()); // if we have a screen and it's not started, wait for it if (m_screen != nullptr && !m_screen->started()) throw device_missing_dependencies(); }