85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
#ifndef __PD_H__
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#define __PD_H__
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#include <stdio.h>
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#include <stdlib.h>
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#include "md.h"
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// DGen/SDL v1.17+
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// Platform-dependent interface
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// Your platform implementation needs to define all these functions and
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// variables!
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// Return the number of microseconds elapsed since an unspecified time.
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unsigned long pd_usecs(void);
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// This is the struct bmap setup by your implementation.
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// It should be 336x240 (or 336x256 in PAL mode), in 8, 12, 15, 16, 24 or 32
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// bits-per-pixel.
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extern struct bmap mdscr;
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// Also, you should allocate a 256-char palette array, if need be. Otherwise
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// this can be NULL if you don't have a paletted display.
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extern unsigned char *mdpal;
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// Initialize graphics, in NTSC (320x224) or PAL (320x240) mode.
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// Since many interfaces require that DGen be setuid-root, this should also
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// discard root priviledges, if at all necessary.
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// It should return 1 on successful setup, or 0 if something wrong happened.
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int pd_graphics_init(int want_sound, int want_pal, int hz);
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int pd_graphics_reinit(int want_sound, int want_pal, int hz);
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// This updats the palette, if necessary.
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void pd_graphics_palette_update();
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// This updates the screen, with the mdscr bitmap.
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void pd_graphics_update(bool update);
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// This is the struct sndinfo, also setup by your implementation.
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// Note that the buffers pointed to in this struct should ALWAYS be 16-bit
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// signed format, regardless of the actual audio format.
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extern struct sndinfo sndi;
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// Initialize sound, with the given frequency and number of samples.
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// It should keep samples' worth of sound buffered.
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// The parameters should all be modified to reflect the actual characteristics.
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// This is always called after pd_graphics_init, so you can count on graphics
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// stuff being initialized. :)
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// It should return 1 on successful setup, or 0 if something wrong happened.
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int pd_sound_init(long &freq, unsigned int &samples);
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void pd_sound_deinit();
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// This should return samples read/write indices in the buffer.
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unsigned int pd_sound_rp();
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unsigned int pd_sound_wp();
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// And this function is called to commit the sound buffers to be played.
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void pd_sound_write();
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// Register platform-specific rc variables
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void pd_rc();
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// This should be a list of all the command-line options specific to this
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// platform, in the form given to getopt(3), i.e "a:b::c".
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extern const char *pd_options;
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// And, this is called to handle platform-specific stuff.
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void pd_option(char c, const char *optarg);
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// This is called after displaying the base options for help, so that you may
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// document your platform-specific command-line options etc.
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void pd_help();
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// This is called before each frame to handle events, and update the MegaDrive
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// accordingly. It returns 1 to continue playing the game, or 0 to quit.
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int pd_handle_events(md &megad);
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// Tells whether DGen stopped intentionally so emulation can resume without
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// skipping frames.
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int pd_stopped();
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// If true, stop emulation (display last frame repeatedly).
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extern bool pd_freeze;
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// These are called to display and clear game messages.
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void pd_message(const char *fmt, ...);
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void pd_clear_message();
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// This should display cartridge header info. You can do this any way you like,
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// I don't care. :)
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void pd_show_carthead(md &megad);
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// This should clean up the mess you made. ;)
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void pd_quit();
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#endif // __PD_H__
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