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59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
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/* Measures performance of SPC emulator. Takes about 4 seconds.
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NOTE: This assumes that the program is getting all processor time; you might need to
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arrange for this or else the performance will be reported lower than it really is.
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Usage: benchmark [test.spc]
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*/
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#include "snes_spc/spc.h"
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#include "demo_util.h" /* error(), load_file() */
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#include <time.h>
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clock_t start_timing( int seconds );
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int main( int argc, char** argv )
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{
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/* Load SPC */
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long spc_size;
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void* spc = load_file( (argc > 1) ? argv [1] : "test.spc", &spc_size );
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SNES_SPC* snes_spc = spc_new();
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if ( !snes_spc ) error( "Out of memory" );
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spc_load_spc( snes_spc, spc, spc_size );
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free( spc );
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{
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/* Repeatedly fill buffer for 4 seconds */
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int const seconds = 4;
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#define BUF_SIZE 4096
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clock_t end = start_timing( seconds );
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int count = 0;
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while ( clock() < end )
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{
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static short buf [BUF_SIZE];
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error( spc_play( snes_spc, BUF_SIZE, buf ) );
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count++;
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}
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/* Report performance based on how many buffer fills were possible */
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{
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double rate = (double) count * BUF_SIZE / (spc_sample_rate * 2 * seconds);
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printf( "Performance: %.3fx real-time, or %.0f%% CPU for normal rate\n",
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rate, 100.0 / rate );
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}
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}
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return 0;
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}
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/* Synchronizes with host clock and returns clock() time that is duration seconds from now */
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clock_t start_timing( int duration )
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{
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clock_t clock_dur = duration * CLOCKS_PER_SEC;
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clock_t time = clock();
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while ( clock() == time ) { }
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if ( clock() - time > clock_dur )
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error( "Insufficient clock() time resolution" );
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return clock() + clock_dur;
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}
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