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Another tiny speed tweak for fmopl.cpp; replace a division with a shift.

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svn-id: r30968
This commit is contained in:
Robin Watts 2008-02-26 00:29:40 +00:00
parent 07a7800ebd
commit 2579136dd2
1 changed files with 4 additions and 3 deletions
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7
sound/fmopl.cpp
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@ -59,10 +59,11 @@
/* used static memory = SIN_ENT * 4 (byte) */
#ifdef __DS__
#include "dsmain.h"
#define SIN_ENT 256
#define SIN_ENT_SHIFT 8
#else
#define SIN_ENT 2048
#define SIN_ENT_SHIFT 11
#endif
#define SIN_ENT (1<<SIN_ENT_SHIFT)
/* output level entries (envelope,sinwave) */
/* envelope counter lower bits */
@ -464,7 +465,7 @@ inline void set_sl_rr(FM_OPL *OPL, int slot, int v) {
/* operator output calcrator */
#define OP_OUT(slot,env,con) slot->wavetable[((slot->Cnt + con) / (0x1000000 / SIN_ENT)) & (SIN_ENT-1)][env]
#define OP_OUT(slot,env,con) slot->wavetable[((slot->Cnt + con)>>(24-SIN_ENT_SHIFT)) & (SIN_ENT-1)][env]
/* ---------- calcrate one of channel ---------- */
inline void OPL_CALC_CH(OPL_CH *CH) {
uint env_out;