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https://github.com/ZDoom/gzdoom-gles.git
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88 lines
2 KiB
C++
88 lines
2 KiB
C++
// Nintendo Game Boy GBS music file emulator
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// Game_Music_Emu 0.5.2
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#ifndef GBS_EMU_H
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#define GBS_EMU_H
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#include "Classic_Emu.h"
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#include "Gb_Apu.h"
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#include "Gb_Cpu.h"
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class Gbs_Emu : private Gb_Cpu, public Classic_Emu {
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typedef Gb_Cpu cpu;
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public:
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// Equalizer profiles for Game Boy Color speaker and headphones
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static equalizer_t const handheld_eq;
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static equalizer_t const headphones_eq;
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// GBS file header
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enum { header_size = 112 };
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struct header_t
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{
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char tag [3];
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byte vers;
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byte track_count;
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byte first_track;
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byte load_addr [2];
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byte init_addr [2];
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byte play_addr [2];
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byte stack_ptr [2];
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byte timer_modulo;
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byte timer_mode;
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char game [32];
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char author [32];
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char copyright [32];
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};
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// Header for currently loaded file
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header_t const& header() const { return header_; }
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static gme_type_t static_type() { return gme_gbs_type; }
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public:
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// deprecated
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using Music_Emu::load;
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blargg_err_t load( header_t const& h, Data_Reader& in ) // use Remaining_Reader
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{ return load_remaining_( &h, sizeof h, in ); }
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public:
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Gbs_Emu();
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~Gbs_Emu();
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protected:
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blargg_err_t track_info_( track_info_t*, int track ) const;
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blargg_err_t load_( Data_Reader& );
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blargg_err_t start_track_( int );
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blargg_err_t run_clocks( blip_time_t&, int );
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void set_tempo_( double );
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void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
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void update_eq( blip_eq_t const& );
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void unload();
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private:
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// rom
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enum { bank_size = 0x4000 };
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Rom_Data<bank_size> rom;
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void set_bank( int );
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// timer
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blip_time_t cpu_time;
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blip_time_t play_period;
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blip_time_t next_play;
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void update_timer();
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header_t header_;
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void cpu_jsr( gb_addr_t );
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public: private: friend class Gb_Cpu;
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blip_time_t clock() const { return cpu_time - cpu::remain(); }
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enum { joypad_addr = 0xFF00 };
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enum { ram_addr = 0xA000 };
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enum { hi_page = 0xFF00 - ram_addr };
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byte ram [0x4000 + 0x2000 + Gb_Cpu::cpu_padding];
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Gb_Apu apu;
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int cpu_read( gb_addr_t );
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void cpu_write( gb_addr_t, int );
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};
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#endif
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