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Eliminates branch within snare output.

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This commit is contained in:
Thomas Harte 2020-04-26 00:21:15 -04:00
parent ee10fe3d2c
commit 2bc36a6cde
1 changed files with 11 additions and 7 deletions
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18
Components/OPL2/Implementation/Operator.cpp
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@ -274,13 +274,17 @@ LogSign Operator::snare_output(OperatorState &state) {
// constexpr int masks[] = {~0, 0};
// result += masks[state.lfsr_
if((state.raw_phase_ >> 11) & 0x200) {
// Result is -max if LFSR is 0, otherwise -0.
result = negative_log_sin(1024 + ((state.lfsr_^1) << 8));
} else {
// Result is +max if LFSR is 1, otherwise +0.
result = negative_log_sin(state.lfsr_ << 8);
}
const int sign = (state.raw_phase_ >> 11) & 0x200;
const int level = ((state.raw_phase_ >> 20) & 1) ^ state.lfsr_;
result = negative_log_sin(sign + (level << 8));
// if((state.raw_phase_ >> 11) & 0x200) {
// // Result is -max if LFSR is 0, otherwise -0.
// result = negative_log_sin(512 + ((state.lfsr_^1) << 8));
// } else {
// // Result is +max if LFSR is 1, otherwise +0.
// result = negative_log_sin(state.lfsr_ << 8);
// }
// printf("%d %d: %d/%d\n", state.lfsr_, (state.raw_phase_ >> 11) & 1023, result.log, result.sign);