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// Common aspects of emulators which use Blip_Buffer for sound output
// Game_Music_Emu 0.6-pre
#ifndef CLASSIC_EMU_H
#define CLASSIC_EMU_H
#include "blargg_common.h"
#include "Blip_Buffer.h"
#include "Music_Emu.h"
class Classic_Emu : public Music_Emu {
protected:
// Derived interface
// Advertises type of sound on each voice, so Effects_Buffer can better choose
// what effect to apply (pan, echo, surround). Constant can have value added so
// that voices of the same type can be spread around the stereo sound space.
enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type };
void set_voice_types( int const types [] ) { voice_types = types; }
// Sets up Blip_Buffers after loading file
blargg_err_t setup_buffer( int clock_rate );
// Clock rate of Blip_buffers
int clock_rate() const { return clock_rate_; }
// Changes clock rate of Blip_Buffers (experimental)
void change_clock_rate( int );
// Overrides should do the indicated task
// Set Blip_Buffer(s) voice outputs to, or mute voice if pointer is NULL
virtual void set_voice( int index, Blip_Buffer* center,
Blip_Buffer* left, Blip_Buffer* right ) BLARGG_PURE( ; )
// Update equalization
virtual void update_eq( blip_eq_t const& ) BLARGG_PURE( ; )
// Start track
virtual blargg_err_t start_track_( int track ) BLARGG_PURE( ; )
// Run for at most msec or time_io clocks, then set time_io to number of clocks
// actually run for. After returning, Blip_Buffers have time frame of time_io clocks
// ended.
virtual blargg_err_t run_clocks( blip_time_t& time_io, int msec ) BLARGG_PURE( ; )
// Internal
public:
Classic_Emu();
~Classic_Emu();
virtual void set_buffer( Multi_Buffer* );
protected:
virtual blargg_err_t set_sample_rate_( int sample_rate );
virtual void mute_voices_( int );
virtual void set_equalizer_( equalizer_t const& );
virtual blargg_err_t play_( int, sample_t [] );
private:
Multi_Buffer* buf;
Multi_Buffer* stereo_buffer; // NULL if using custom buffer
int clock_rate_;
unsigned buf_changed_count;
int const* voice_types;
};
inline void Classic_Emu::set_buffer( Multi_Buffer* new_buf )
{
assert( !buf && new_buf );
buf = new_buf;
}
inline void Classic_Emu::set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* ) { }
inline void Classic_Emu::update_eq( blip_eq_t const& ) { }
inline blargg_err_t Classic_Emu::run_clocks( blip_time_t&, int ) { return blargg_ok; }
#endif
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