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https://github.com/ZDoom/gzdoom-gles.git
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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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