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1 /* Measures performance of SPC emulator. Takes about 4 seconds.
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2 NOTE: This assumes that the program is getting all processor time; you might need to
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3 arrange for this or else the performance will be reported lower than it really is.
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4
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5 Usage: benchmark [test.spc]
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6 */
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7
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8 #include "snes_spc/spc.h"
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9
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10 #include "demo_util.h" /* error(), load_file() */
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11 #include <time.h>
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12
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13 clock_t start_timing( int seconds );
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14
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15 int main( int argc, char** argv )
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16 {
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17 /* Load SPC */
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18 long spc_size;
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19 void* spc = load_file( (argc > 1) ? argv [1] : "test.spc", &spc_size );
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20 SNES_SPC* snes_spc = spc_new();
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21 if ( !snes_spc ) error( "Out of memory" );
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22 spc_load_spc( snes_spc, spc, spc_size );
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23 free( spc );
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24
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25 {
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26 /* Repeatedly fill buffer for 4 seconds */
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27 int const seconds = 4;
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28 #define BUF_SIZE 4096
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29 clock_t end = start_timing( seconds );
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30 int count = 0;
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31 while ( clock() < end )
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32 {
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33 static short buf [BUF_SIZE];
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34 error( spc_play( snes_spc, BUF_SIZE, buf ) );
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35 count++;
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36 }
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37
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38 /* Report performance based on how many buffer fills were possible */
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39 {
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40 double rate = (double) count * BUF_SIZE / (spc_sample_rate * 2 * seconds);
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41 printf( "Performance: %.3fx real-time, or %.0f%% CPU for normal rate\n",
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42 rate, 100.0 / rate );
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43 }
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44 }
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45
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46 return 0;
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47 }
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48
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49 /* Synchronizes with host clock and returns clock() time that is duration seconds from now */
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50 clock_t start_timing( int duration )
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51 {
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52 clock_t clock_dur = duration * CLOCKS_PER_SEC;
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53 clock_t time = clock();
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54 while ( clock() == time ) { }
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55 if ( clock() - time > clock_dur )
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56 error( "Insufficient clock() time resolution" );
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57 return clock() + clock_dur;
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58 }
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