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1 snes_spc Change Log
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2 -------------------
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3
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4 snes_spc 0.9.0
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5 --------------
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6 - Improved documentation
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7
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8 - SPC: Added spc_skip() function for quickly seeking in an SPC music
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9 file. Runs 3-4x faster than normal playback using the fast DSP (or about
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10 43-60X real-time on my 400 MHz Mac).
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11
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12 - SPC: Added spc_set_tempo() to change tempo of SPC music playback.
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13
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14 - SPC: Sample generation is now corrected to generate exactly one pair
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15 of samples every 32 clocks without exception. Before it could generate a
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16 few samples more or less depending on how far ahead or behind DSP was at
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17 the moment.
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18
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19 - SPC: Changed spc_reset() and spc_soft_reset() to also reset output
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20 buffer (see spc.h).
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21
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22 - SPC: Fixed minor timer counting bug.
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23
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24 - SPC: Stack pointer wrap-around is now emulated (and without any
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25 noticeable performance hit).
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26
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27 - SPC: Runs about 5% faster due to various optimizations.
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28
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29 - SPC: Found way to make fast DSP register accesses cycle-accurate in
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30 most cases, without reducing performance. Allows fast DSP to pass most
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31 of my validation tests.
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32
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33 - DSP: Added surround disable support to fast DSP again.
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34
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35 - DSP: Improved voice un-muting to take effect immediately on fast DSP.
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36
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37 - DSP: Noise shift register now starts at 0x4000 instead of 0x4001 as it
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38 incorrectly did before.
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39
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40 - Converted library to C++ code internally. A C interface is still
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41 included in spc.h and dsp.h. Note that these are different than the
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42 previous interface, so your code will require minor changes:
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43
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44 Old SPC code New SPC code
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45 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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46 #include "spc/spc.h" #include "snes_spc/spc.h"
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47
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48 snes_spc_t* spc; SNES_SPC* spc;
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49 spc = malloc( sizeof (snes_spc_t) ); spc = spc_new();
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50 spc_init( spc );
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51
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52 spc_end_frame( time ); spc_end_frame( spc, time );
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53 /* etc. */
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54
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55 /* done using SPC */ spc_delete( spc );
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56
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57
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58 Old DSP code New DSP code
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59 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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60 #include "spc/spc_dsp.h" #include "snes_spc/dsp.h"
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61
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62 spc_dsp_init( ram ); SPC_DSP* dsp;
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63 dsp = spc_dsp_new();
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64 spc_dsp_init( dsp, ram );
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65
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66 spc_dsp_run( count ); spc_dsp_run( dsp, count );
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67 /* etc. */
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68
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69 /* done using DSP */ spc_dsp_delete( dsp );
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70
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71
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72 snes_spc 0.8.0
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73 --------------
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74 - Added several demos
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75
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76 - Added high-pass/low-pass filter to better match SNES sound
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77
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78 - Added save state functionality for SPC and accurate DSP (but not fast
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79 DSP)
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80
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81 - Added emulation of reset switch on NES (soft reset)
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82
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83 - Made source more compatible with pre-C99 compilers by eliminating
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84 mid-block declarations
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85
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86 - SPC: Many S-SMP accuracy improvements, mostly in memory access times
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87
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88 - SPC: S-SMP speed improvements
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89
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90 - SPC: Added SPC load/save functions and KON checking to help trim
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91 silence from beginning
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92
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93 - SPC: Changed spc_init() to have you allocate most of the memory used
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94 by the library so you have more control over it
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95
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96 - DSP: New highly accurate DSP and faster version derived from same code
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97
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98 - DSP: Changed prefix from dsp_ to spc_dsp_. Your DSP code will require
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99 changes.
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100
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101 - DSP: Removed surround disable and gain. Gain can now be done with the
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102 dsp_filter module, and surround disable will probably only be
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103 implemented in the fast DSP at some point.
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104
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105 - DSP: Changed interface to work in clocks rather than samples,
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106 necessary for the new accurate DSP. Sample output is now done with
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107 separate functions. Your DSP code will require changes.
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