Mercurial > repos > blastem
diff ym2612.c @ 1002:8d032a368dd5
Made low pass filter frequency configurable
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 01 May 2016 13:36:14 -0700 |
| parents | 5257e85364ed |
| children | c15896605bf2 |
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--- a/ym2612.c Sat Apr 30 20:57:29 2016 -0700 +++ b/ym2612.c Sun May 01 13:36:14 2016 -0700 @@ -128,9 +128,7 @@ #define log2(x) (log(x)/log(2)) #endif -#define LOWPASS_CUTOFF 3390 - -void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit, uint32_t options) +void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit, uint32_t options, uint32_t lowpass_cutoff) { static uint8_t registered_finalize; dfopen(debug_file, "ym_debug.txt", "w"); @@ -141,7 +139,7 @@ context->clock_inc = clock_div * 6; ym_adjust_master_clock(context, master_clock); - double rc = (1.0 / (double)LOWPASS_CUTOFF) / (2.0 * M_PI); + double rc = (1.0 / (double)lowpass_cutoff) / (2.0 * M_PI); double dt = 1.0 / ((double)master_clock / (double)(context->clock_inc * NUM_OPERATORS)); double alpha = dt / (dt + rc); context->lowpass_alpha = (int32_t)(((double)0x10000) * alpha);