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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
// Common aspects of emulators which use Blip_Buffer for sound output
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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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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public:
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Classic_Emu();
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~Classic_Emu();
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void set_buffer( Multi_Buffer* );
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blargg_err_t set_multi_channel( bool is_enabled ) override;
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protected:
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// Services
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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* t ) { voice_types = t; }
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blargg_err_t setup_buffer( long clock_rate );
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long clock_rate() const { return clock_rate_; }
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void change_clock_rate( long ); // experimental
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// Overridable
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virtual void set_voice( int index, Blip_Buffer* center,
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Blip_Buffer* left, Blip_Buffer* right ) = 0;
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virtual void update_eq( blip_eq_t const& ) = 0;
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virtual blargg_err_t start_track_( int track ) = 0;
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virtual blargg_err_t run_clocks( blip_time_t& time_io, int msec ) = 0;
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protected:
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blargg_err_t set_sample_rate_( long sample_rate );
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void mute_voices_( int );
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void set_equalizer_( equalizer_t const& );
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blargg_err_t play_( long, 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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long 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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// ROM data handler, used by several Classic_Emu derivitives. Loads file data
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// with padding on both sides, allowing direct use in bank mapping. The main purpose
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// is to allow all file data to be loaded with only one read() call (for efficiency).
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class Rom_Data_ {
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public:
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typedef unsigned char byte;
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protected:
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enum { pad_extra = 8 };
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blargg_vector<byte> rom;
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long file_size_;
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blargg_long rom_addr;
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blargg_long mask;
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blargg_long size_; // TODO: eliminate
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blargg_err_t load_rom_data_( Data_Reader& in, int header_size, void* header_out,
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int fill, long pad_size );
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void set_addr_( long addr, int unit );
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};
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template<int unit>
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class Rom_Data : public Rom_Data_ {
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enum { pad_size = unit + pad_extra };
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public:
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// Load file data, using already-loaded header 'h' if not NULL. Copy header
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// from loaded file data into *out and fill unmapped bytes with 'fill'.
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blargg_err_t load( Data_Reader& in, int header_size, void* header_out, int fill )
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{
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return load_rom_data_( in, header_size, header_out, fill, pad_size );
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}
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// Size of file data read in (excluding header)
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long file_size() const { return file_size_; }
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// Pointer to beginning of file data
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byte* begin() const { return rom.begin() + pad_size; }
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// Set address that file data should start at
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void set_addr( long addr ) { set_addr_( addr, unit ); }
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// Free data
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void clear() { rom.clear(); }
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// Size of data + start addr, rounded to a multiple of unit
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long size() const { return size_; }
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// Pointer to unmapped page filled with same value
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byte* unmapped() { return rom.begin(); }
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// Mask address to nearest power of two greater than size()
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blargg_long mask_addr( blargg_long addr ) const
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{
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#ifdef check
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check( addr <= mask );
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#endif
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return addr & mask;
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}
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// Pointer to page starting at addr. Returns unmapped() if outside data.
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byte* at_addr( blargg_long addr )
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{
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blargg_ulong offset = mask_addr( addr ) - rom_addr;
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if ( offset > blargg_ulong (rom.size() - pad_size) )
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offset = 0; // unmapped
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return &rom [offset];
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}
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};
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#ifndef GME_APU_HOOK
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#define GME_APU_HOOK( emu, addr, data ) ((void) 0)
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#endif
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#ifndef GME_FRAME_HOOK
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#define GME_FRAME_HOOK( emu ) ((void) 0)
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#else
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#define GME_FRAME_HOOK_DEFINED 1
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#endif
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#endif
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