mirror of https://github.com/ZDoom/gzdoom-gles.git
108 lines
3.6 KiB
Plaintext
108 lines
3.6 KiB
Plaintext
snes_spc Change Log
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-------------------
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snes_spc 0.9.0
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--------------
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- Improved documentation
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- SPC: Added spc_skip() function for quickly seeking in an SPC music
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file. Runs 3-4x faster than normal playback using the fast DSP (or about
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43-60X real-time on my 400 MHz Mac).
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- SPC: Added spc_set_tempo() to change tempo of SPC music playback.
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- SPC: Sample generation is now corrected to generate exactly one pair
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of samples every 32 clocks without exception. Before it could generate a
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few samples more or less depending on how far ahead or behind DSP was at
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the moment.
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- SPC: Changed spc_reset() and spc_soft_reset() to also reset output
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buffer (see spc.h).
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- SPC: Fixed minor timer counting bug.
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- SPC: Stack pointer wrap-around is now emulated (and without any
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noticeable performance hit).
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- SPC: Runs about 5% faster due to various optimizations.
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- SPC: Found way to make fast DSP register accesses cycle-accurate in
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most cases, without reducing performance. Allows fast DSP to pass most
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of my validation tests.
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- DSP: Added surround disable support to fast DSP again.
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- DSP: Improved voice un-muting to take effect immediately on fast DSP.
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- DSP: Noise shift register now starts at 0x4000 instead of 0x4001 as it
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incorrectly did before.
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- Converted library to C++ code internally. A C interface is still
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included in spc.h and dsp.h. Note that these are different than the
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previous interface, so your code will require minor changes:
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Old SPC code New SPC code
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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#include "spc/spc.h" #include "snes_spc/spc.h"
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snes_spc_t* spc; SNES_SPC* spc;
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spc = malloc( sizeof (snes_spc_t) ); spc = spc_new();
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spc_init( spc );
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spc_end_frame( time ); spc_end_frame( spc, time );
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/* etc. */
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/* done using SPC */ spc_delete( spc );
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Old DSP code New DSP code
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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#include "spc/spc_dsp.h" #include "snes_spc/dsp.h"
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spc_dsp_init( ram ); SPC_DSP* dsp;
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dsp = spc_dsp_new();
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spc_dsp_init( dsp, ram );
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spc_dsp_run( count ); spc_dsp_run( dsp, count );
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/* etc. */
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/* done using DSP */ spc_dsp_delete( dsp );
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snes_spc 0.8.0
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--------------
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- Added several demos
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- Added high-pass/low-pass filter to better match SNES sound
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- Added save state functionality for SPC and accurate DSP (but not fast
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DSP)
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- Added emulation of reset switch on NES (soft reset)
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- Made source more compatible with pre-C99 compilers by eliminating
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mid-block declarations
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- SPC: Many S-SMP accuracy improvements, mostly in memory access times
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- SPC: S-SMP speed improvements
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- SPC: Added SPC load/save functions and KON checking to help trim
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silence from beginning
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- SPC: Changed spc_init() to have you allocate most of the memory used
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by the library so you have more control over it
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- DSP: New highly accurate DSP and faster version derived from same code
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- DSP: Changed prefix from dsp_ to spc_dsp_. Your DSP code will require
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changes.
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- DSP: Removed surround disable and gain. Gain can now be done with the
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dsp_filter module, and surround disable will probably only be
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implemented in the fast DSP at some point.
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- DSP: Changed interface to work in clocks rather than samples,
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necessary for the new accurate DSP. Sample output is now done with
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separate functions. Your DSP code will require changes.
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