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