snes_spc Change Log
-------------------

snes_spc 0.9.0
--------------
- Improved documentation

- SPC: Added spc_skip() function for quickly seeking in an SPC music
file. Runs 3-4x faster than normal playback using the fast DSP (or about
43-60X real-time on my 400 MHz Mac).

- SPC: Added spc_set_tempo() to change tempo of SPC music playback.

- SPC: Sample generation is now corrected to generate exactly one pair
of samples every 32 clocks without exception. Before it could generate a
few samples more or less depending on how far ahead or behind DSP was at
the moment.

- SPC: Changed spc_reset() and spc_soft_reset() to also reset output
buffer (see spc.h).

- SPC: Fixed minor timer counting bug.

- SPC: Stack pointer wrap-around is now emulated (and without any
noticeable performance hit).

- SPC: Runs about 5% faster due to various optimizations.

- SPC: Found way to make fast DSP register accesses cycle-accurate in
most cases, without reducing performance. Allows fast DSP to pass most
of my validation tests.

- DSP: Added surround disable support to fast DSP again.

- DSP: Improved voice un-muting to take effect immediately on fast DSP.

- DSP: Noise shift register now starts at 0x4000 instead of 0x4001 as it
incorrectly did before.

- Converted library to C++ code internally. A C interface is still
included in spc.h and dsp.h. Note that these are different than the
previous interface, so your code will require minor changes:

	Old SPC code                            New SPC code
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	#include "spc/spc.h"                    #include "snes_spc/spc.h"

	snes_spc_t* spc;                        SNES_SPC* spc;
	spc = malloc( sizeof (snes_spc_t) );    spc = spc_new();
	spc_init( spc );
	
	spc_end_frame( time );                  spc_end_frame( spc, time );
	/* etc. */
	
	/* done using SPC */                    spc_delete( spc );
	
	
	Old DSP code                            New DSP code
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	#include "spc/spc_dsp.h"                #include "snes_spc/dsp.h"
	
	spc_dsp_init( ram );                    SPC_DSP* dsp;
											dsp = spc_dsp_new();
											spc_dsp_init( dsp, ram );
	
	spc_dsp_run( count );                   spc_dsp_run( dsp, count );
	/* etc. */
	
	/* done using DSP */                    spc_dsp_delete( dsp );
	

snes_spc 0.8.0
--------------
- Added several demos

- Added high-pass/low-pass filter to better match SNES sound

- Added save state functionality for SPC and accurate DSP (but not fast
DSP)

- Added emulation of reset switch on NES (soft reset)

- Made source more compatible with pre-C99 compilers by eliminating
mid-block declarations

- SPC: Many S-SMP accuracy improvements, mostly in memory access times

- SPC: S-SMP speed improvements

- SPC: Added SPC load/save functions and KON checking to help trim
silence from beginning

- SPC: Changed spc_init() to have you allocate most of the memory used
by the library so you have more control over it

- DSP: New highly accurate DSP and faster version derived from same code

- DSP: Changed prefix from dsp_ to spc_dsp_. Your DSP code will require
changes.

- DSP: Removed surround disable and gain. Gain can now be done with the
dsp_filter module, and surround disable will probably only be
implemented in the fast DSP at some point.

- DSP: Changed interface to work in clocks rather than samples,
necessary for the new accurate DSP. Sample output is now done with
separate functions. Your DSP code will require changes.