92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
// Atari XL/XE SAP core CPU and RAM emulator
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// Game_Music_Emu $vers
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#ifndef SAP_CORE_H
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#define SAP_CORE_H
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#include "Sap_Apu.h"
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#include "Nes_Cpu.h"
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class Sap_Core {
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public:
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// Sound chips and common state
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Sap_Apu& apu() { return apu_; }
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Sap_Apu& apu2() { return apu2_; }
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Sap_Apu_Impl& apu_impl() { return apu_impl_; }
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// Adjusts music tempo, where 1.0 is normal. Can be changed while playing.
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void set_tempo( double );
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// Clears RAM and sets up default vectors, etc.
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void setup_ram();
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// 64K RAM to load file data blocks into
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BOOST::uint8_t* ram() { return mem.ram; }
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// Calls init routine and configures playback. RAM must have been
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// set up already.
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struct info_t {
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int init_addr;
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int play_addr;
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int music_addr;
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int type;
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int fastplay;
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bool stereo;
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};
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blargg_err_t start_track( int track, info_t const& );
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// Ends time frame at time t, then begins new at time 0
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typedef Nes_Cpu::time_t time_t; // Clock count
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blargg_err_t end_frame( time_t t );
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// Implementation
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public:
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Sap_Core();
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private:
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enum { base_scanline_period = 114 };
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enum { lines_per_frame = 312 };
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typedef Nes_Cpu::addr_t addr_t;
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time_t scanline_period;
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time_t next_play;
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time_t time_mask;
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time_t frame_start;
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Nes_Cpu cpu;
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Nes_Cpu::registers_t saved_state;
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info_t info;
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Sap_Apu apu_;
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Sap_Apu apu2_;
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// large items
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struct {
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BOOST::uint8_t padding1 [ 0x100];
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BOOST::uint8_t ram [0x10000];
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BOOST::uint8_t padding2 [ 0x100];
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} mem; // TODO: put on freestore
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Sap_Apu_Impl apu_impl_;
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void push( int b );
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void jsr_then_stop( addr_t );
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void run_routine( addr_t );
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void call_init( int track );
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bool run_cpu( time_t end );
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int play_addr();
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int read_d40b();
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int read_mem( addr_t );
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void write_D2xx( int d2xx, int data );
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time_t time() const { return cpu.time() & time_mask; }
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blargg_err_t run_until( time_t t );
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time_t play_period() const { return info.fastplay * scanline_period; }
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};
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inline void Sap_Core::set_tempo( double t )
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{
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scanline_period = (int) (base_scanline_period / t + 0.5);
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}
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#endif
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