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Diffstat (limited to 'docs/release/src/emu/video.h')
-rw-r--r-- | docs/release/src/emu/video.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/docs/release/src/emu/video.h b/docs/release/src/emu/video.h new file mode 100644 index 00000000000..eb77d0d4ddb --- /dev/null +++ b/docs/release/src/emu/video.h @@ -0,0 +1,175 @@ +// license:BSD-3-Clause +// copyright-holders:Aaron Giles +/*************************************************************************** + + video.h + + Core MAME video routines. + +***************************************************************************/ + +#pragma once + +#ifndef __EMU_H__ +#error Dont include this file directly; include emu.h instead. +#endif + +#ifndef MAME_EMU_VIDEO_H +#define MAME_EMU_VIDEO_H + +#include "recording.h" + +#include <system_error> + + +//************************************************************************** +// CONSTANTS +//************************************************************************** + +// number of levels of frameskipping supported +constexpr int FRAMESKIP_LEVELS = 12; +constexpr int MAX_FRAMESKIP = FRAMESKIP_LEVELS - 2; + + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +// ======================> video_manager + +class video_manager +{ + friend class screen_device; + +public: + // construction/destruction + video_manager(running_machine &machine); + + // getters + running_machine &machine() const { return m_machine; } + bool skip_this_frame() const { return m_skipping_this_frame; } + int speed_factor() const { return m_speed; } + int frameskip() const { return m_auto_frameskip ? -1 : m_frameskip_level; } + bool throttled() const { return m_throttled; } + float throttle_rate() const { return m_throttle_rate; } + bool fastforward() const { return m_fastforward; } + + // setters + void set_speed_factor(int speed) { m_speed = speed; } // MESSUI + void set_frameskip(int frameskip); + void set_throttled(bool throttled) { m_throttled = throttled; } + void set_throttle_rate(float throttle_rate) { m_throttle_rate = throttle_rate; } + void set_fastforward(bool ffwd) { m_fastforward = ffwd; } + void set_output_changed() { m_output_changed = true; } + + // misc + void toggle_record_movie(movie_recording::format format); + std::error_condition open_next(emu_file &file, const char *extension, uint32_t index = 0); + void compute_snapshot_size(s32 &width, s32 &height); + void pixels(u32 *buffer); + + // render a frame + void frame_update(bool from_debugger = false); + + // current speed helpers + std::string speed_text(); + double speed_percent() const { return m_speed_percent; } + int effective_frameskip() const; + + // snapshots + bool snap_native() const { return m_snap_native; } + render_target &snapshot_target() { return *m_snap_target; } + void save_snapshot(screen_device *screen, util::core_file &file); + void save_active_screen_snapshots(); + + // movies + void begin_recording(const char *name, movie_recording::format format); + void end_recording(); + void add_sound_to_recording(const s16 *sound, int numsamples); + bool is_recording() const { return !m_movie_recordings.empty(); } + +private: + // internal helpers + void exit(); + void screenless_update_callback(int param); + void postload(); + + // effective value helpers + bool effective_autoframeskip() const; + bool effective_throttle() const; + + // speed and throttling helpers + int original_speed_setting() const; + bool finish_screen_updates(); + void update_throttle(attotime emutime); + osd_ticks_t throttle_until_ticks(osd_ticks_t target_ticks); + void update_frameskip(); + void update_refresh_speed(); + void recompute_speed(const attotime &emutime); + + // snapshot/movie helpers + void create_snapshot_bitmap(screen_device *screen); + void record_frame(); + + // movies + void begin_recording_screen(const std::string &filename, uint32_t index, screen_device *screen, movie_recording::format format); + + // internal state + running_machine & m_machine; // reference to our machine + + // screenless systems + emu_timer * m_screenless_frame_timer; // timer to signal VBLANK start + bool m_output_changed; // did an output element change? + + // throttling calculations + osd_ticks_t m_throttle_last_ticks; // osd_ticks the last call to throttle + attotime m_throttle_realtime; // real time the last call to throttle + attotime m_throttle_emutime; // emulated time the last call to throttle + u32 m_throttle_history; // history of frames where we were fast enough + + // dynamic speed computation + osd_ticks_t m_speed_last_realtime; // real time at the last speed calculation + attotime m_speed_last_emutime; // emulated time at the last speed calculation + double m_speed_percent; // most recent speed percentage + + // overall speed computation + u32 m_overall_real_seconds; // accumulated real seconds at normal speed + osd_ticks_t m_overall_real_ticks; // accumulated real ticks at normal speed + attotime m_overall_emutime; // accumulated emulated time at normal speed + u32 m_overall_valid_counter; // number of consecutive valid time periods + + // configuration + bool m_throttled; // flag: true if we're currently throttled + float m_throttle_rate; // target rate for throttling + bool m_fastforward; // flag: true if we're currently fast-forwarding + u32 m_seconds_to_run; // number of seconds to run before quitting + bool m_auto_frameskip; // flag: true if we're automatically frameskipping + u32 m_speed; // overall speed (*1000) + bool m_low_latency; // flag: true if we are throttling after blitting + + // frameskipping + u8 m_empty_skip_count; // number of empty frames we have skipped + u8 m_frameskip_max; // maximum frameskip level + u8 m_frameskip_level; // current frameskip level + u8 m_frameskip_counter; // counter that counts through the frameskip steps + s8 m_frameskip_adjust; + bool m_skipping_this_frame; // flag: true if we are skipping the current frame + osd_ticks_t m_average_oversleep; // average number of ticks the OSD oversleeps + + // snapshot stuff + render_target * m_snap_target; // screen shapshot target + bitmap_rgb32 m_snap_bitmap; // screen snapshot bitmap + bool m_snap_native; // are we using native per-screen layouts? + s32 m_snap_width; // width of snapshots (0 == auto) + s32 m_snap_height; // height of snapshots (0 == auto) + + // movie recordings + std::vector<movie_recording::ptr> m_movie_recordings; + + static const bool s_skiptable[FRAMESKIP_LEVELS][FRAMESKIP_LEVELS]; + + static const attoseconds_t ATTOSECONDS_PER_SPEED_UPDATE = ATTOSECONDS_PER_SECOND / 4; + static const int PAUSED_REFRESH_RATE = 30; +}; + +#endif // MAME_EMU_VIDEO_H |