diff options
Diffstat (limited to 'plugins/gme/game-music-emu-svn/gme/Spc_Dsp.h')
| -rw-r--r-- | plugins/gme/game-music-emu-svn/gme/Spc_Dsp.h | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/plugins/gme/game-music-emu-svn/gme/Spc_Dsp.h b/plugins/gme/game-music-emu-svn/gme/Spc_Dsp.h deleted file mode 100644 index bc0efe5f..00000000 --- a/plugins/gme/game-music-emu-svn/gme/Spc_Dsp.h +++ /dev/null @@ -1,212 +0,0 @@ -// Fast SNES SPC-700 DSP emulator (about 3x speed of accurate one) - -// Game_Music_Emu 0.5.5 -#ifndef SPC_DSP_H -#define SPC_DSP_H - -#include "blargg_common.h" - -struct Spc_Dsp { -public: - typedef BOOST::uint8_t uint8_t; - -// Setup - - // Initializes DSP and has it use the 64K RAM provided - void init( void* ram_64k ); - - // Sets destination for output samples. If out is NULL or out_size is 0, - // doesn't generate any. - typedef short sample_t; - void set_output( sample_t* out, int out_size ); - - // Number of samples written to output since it was last set, always - // a multiple of 2. Undefined if more samples were generated than - // output buffer could hold. - int sample_count() const; - -// Emulation - - // Resets DSP to power-on state - void reset(); - - // Emulates pressing reset switch on SNES - void soft_reset(); - - // Reads/writes DSP registers. For accuracy, you must first call spc_run_dsp() - // to catch the DSP up to present. - int read ( int addr ) const; - void write( int addr, int data ); - - // Runs DSP for specified number of clocks (~1024000 per second). Every 32 clocks - // a pair of samples is be generated. - void run( int clock_count ); - -// Sound control - - // Mutes voices corresponding to non-zero bits in mask (overrides VxVOL with 0). - // Reduces emulation accuracy. - enum { voice_count = 8 }; - void mute_voices( int mask ); - - // If true, prevents channels and global volumes from being phase-negated - void disable_surround( bool disable = true ); - -// State - - // Resets DSP and uses supplied values to initialize registers - enum { register_count = 128 }; - void load( uint8_t const regs [register_count] ); - -// DSP register addresses - - // Global registers - enum { - r_mvoll = 0x0C, r_mvolr = 0x1C, - r_evoll = 0x2C, r_evolr = 0x3C, - r_kon = 0x4C, r_koff = 0x5C, - r_flg = 0x6C, r_endx = 0x7C, - r_efb = 0x0D, r_pmon = 0x2D, - r_non = 0x3D, r_eon = 0x4D, - r_dir = 0x5D, r_esa = 0x6D, - r_edl = 0x7D, - r_fir = 0x0F // 8 coefficients at 0x0F, 0x1F ... 0x7F - }; - - // Voice registers - enum { - v_voll = 0x00, v_volr = 0x01, - v_pitchl = 0x02, v_pitchh = 0x03, - v_srcn = 0x04, v_adsr0 = 0x05, - v_adsr1 = 0x06, v_gain = 0x07, - v_envx = 0x08, v_outx = 0x09 - }; - -public: - enum { extra_size = 16 }; - sample_t* extra() { return m.extra; } - sample_t const* out_pos() const { return m.out; } -public: - BLARGG_DISABLE_NOTHROW - - typedef BOOST::int8_t int8_t; - typedef BOOST::int16_t int16_t; - - enum { echo_hist_size = 8 }; - - enum env_mode_t { env_release, env_attack, env_decay, env_sustain }; - enum { brr_buf_size = 12 }; - struct voice_t - { - int buf [brr_buf_size*2];// decoded samples (twice the size to simplify wrap handling) - int* buf_pos; // place in buffer where next samples will be decoded - int interp_pos; // relative fractional position in sample (0x1000 = 1.0) - int brr_addr; // address of current BRR block - int brr_offset; // current decoding offset in BRR block - int kon_delay; // KON delay/current setup phase - env_mode_t env_mode; - int env; // current envelope level - int hidden_env; // used by GAIN mode 7, very obscure quirk - int volume [2]; // copy of volume from DSP registers, with surround disabled - int enabled; // -1 if enabled, 0 if muted - }; -private: - struct state_t - { - uint8_t regs [register_count]; - - // Echo history keeps most recent 8 samples (twice the size to simplify wrap handling) - int echo_hist [echo_hist_size * 2] [2]; - int (*echo_hist_pos) [2]; // &echo_hist [0 to 7] - - int every_other_sample; // toggles every sample - int kon; // KON value when last checked - int noise; - int echo_offset; // offset from ESA in echo buffer - int echo_length; // number of bytes that echo_offset will stop at - int phase; // next clock cycle to run (0-31) - unsigned counters [4]; - - int new_kon; - int t_koff; - - voice_t voices [voice_count]; - - unsigned* counter_select [32]; - - // non-emulation state - uint8_t* ram; // 64K shared RAM between DSP and SMP - int mute_mask; - int surround_threshold; - sample_t* out; - sample_t* out_end; - sample_t* out_begin; - sample_t extra [extra_size]; - }; - state_t m; - - void init_counter(); - void run_counter( int ); - void soft_reset_common(); - void write_outline( int addr, int data ); - void update_voice_vol( int addr ); -}; - -#include <assert.h> - -inline int Spc_Dsp::sample_count() const { return m.out - m.out_begin; } - -inline int Spc_Dsp::read( int addr ) const -{ - assert( (unsigned) addr < register_count ); - return m.regs [addr]; -} - -inline void Spc_Dsp::update_voice_vol( int addr ) -{ - int l = (int8_t) m.regs [addr + v_voll]; - int r = (int8_t) m.regs [addr + v_volr]; - - if ( l * r < m.surround_threshold ) - { - // signs differ, so negate those that are negative - l ^= l >> 7; - r ^= r >> 7; - } - - voice_t& v = m.voices [addr >> 4]; - int enabled = v.enabled; - v.volume [0] = l & enabled; - v.volume [1] = r & enabled; -} - -inline void Spc_Dsp::write( int addr, int data ) -{ - assert( (unsigned) addr < register_count ); - - m.regs [addr] = (uint8_t) data; - int low = addr & 0x0F; - if ( low < 0x2 ) // voice volumes - { - update_voice_vol( low ^ addr ); - } - else if ( low == 0xC ) - { - if ( addr == r_kon ) - m.new_kon = (uint8_t) data; - - if ( addr == r_endx ) // always cleared, regardless of data written - m.regs [r_endx] = 0; - } -} - -inline void Spc_Dsp::disable_surround( bool disable ) -{ - m.surround_threshold = disable ? 0 : -0x4000; -} - -#define SPC_NO_COPY_STATE_FUNCS 1 - -#define SPC_LESS_ACCURATE 1 - -#endif |