Remove further float operations from emu2413 in libgme to speed up synthesis.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30313 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 16 insertions, 15 deletions

diff --git a/apps/codecs/libgme/emu2413.c b/apps/codecs/libgme/emu2413.c
index def6d60..48f32d8 100644
--- a/apps/codecs/libgme/emu2413.c
+++ b/apps/codecs/libgme/emu2413.c
@@ -93,8 +93,9 @@ static unsigned char default_inst[OPLL_TONE_NUM][(16 + 3) * 16] = {
 #define DP_BASE_BITS (DP_BITS - PG_BITS)

 

 /* Dynamic range (Accuracy of sin table) */

+#define DB_PREC 48

 #define DB_BITS 8

-#define DB_STEP (48.0/(1<<DB_BITS))

+#define DB_STEP ((double)DB_PREC/(1<<DB_BITS))

 #define DB_MUTE (1<<DB_BITS)

 

 /* Dynamic range of envelope */

@@ -116,8 +117,8 @@ static unsigned char default_inst[OPLL_TONE_NUM][(16 + 3) * 16] = {
 #define TL2EG(d) ((d)*(e_int32)(TL_STEP/EG_STEP))

 #define SL2EG(d) ((d)*(e_int32)(SL_STEP/EG_STEP))

 

-#define DB_POS(x) (e_uint32)((x)/DB_STEP)

-#define DB_NEG(x) (e_uint32)(DB_MUTE+DB_MUTE+(x)/DB_STEP)

+#define DB_POS(x) (x*DB_MUTE/DB_PREC)

+#define DB_NEG(x) (DB_MUTE+DB_MUTE+x*DB_MUTE/DB_PREC)

 

 /* Bits for liner value */

 #define DB2LIN_AMP_BITS 8

@@ -162,7 +163,7 @@ static unsigned char default_inst[OPLL_TONE_NUM][(16 + 3) * 16] = {
 #define EXPAND_BITS_X(x,s,d) (((x)<<((d)-(s)))|((1<<((d)-(s)))-1))

 

 /* Adjust envelope speed which depends on sampling rate. */

-#define RATE_ADJUST(x) (rate==49716?(e_uint32)x:(e_uint32)((double)(x)*clk/72/rate + 0.5))        /* added 0.5 to round the value*/

+#define RATE_ADJUST(x) (rate==49716?(e_uint32)x:(e_uint32)(((long long)(x)*clk/rate+36)/72))

 

 #define MOD(o,x) (&(o)->slot[(x)<<1])

 #define CAR(o,x) (&(o)->slot[((x)<<1)|1])

@@ -1167,7 +1168,7 @@ OPLL_set_quality (OPLL * opll, e_uint32 q)
 #endif

 

 /* Update AM, PM unit */

-static void

+INLINE static void

 update_ampm (OPLL * opll)

 {

   opll->pm_phase = (opll->pm_phase + pm_dphase) & (PM_DP_WIDTH - 1);

@@ -1191,7 +1192,7 @@ calc_phase (OPLL_SLOT * slot, e_int32 lfo)
 }

 

 /* Update Noise unit */

-static void

+INLINE static void

 update_noise (OPLL * opll)

 {

    if(opll->noise_seed&1) opll->noise_seed ^= 0x8003020;

@@ -1199,7 +1200,7 @@ update_noise (OPLL * opll)
 }

 

 /* EG */

-static void

+INLINE static void

 calc_envelope (OPLL_SLOT * slot, e_int32 lfo)

 {

 #define S2E(x) (SL2EG((e_int32)(x/SL_STEP))<<(EG_DP_BITS-EG_BITS))

@@ -1360,9 +1361,9 @@ calc_slot_snare (OPLL_SLOT * slot, e_uint32 noise)
     return 0;

   

   if(BIT(slot->pgout,7))

-    return DB2LIN_TABLE[(noise?DB_POS(0.0):DB_POS(15.0))+slot->egout];

+    return DB2LIN_TABLE[(noise?DB_POS(0):DB_POS(15))+slot->egout];

   else

-    return DB2LIN_TABLE[(noise?DB_NEG(0.0):DB_NEG(15.0))+slot->egout];

+    return DB2LIN_TABLE[(noise?DB_NEG(0):DB_NEG(15))+slot->egout];

 }

 

 /* 

@@ -1381,9 +1382,9 @@ calc_slot_cym (OPLL_SLOT * slot, e_uint32 pgout_hh)
       /* different from fmopl.c */

      (BIT(slot->pgout,PG_BITS-7)&!BIT(slot->pgout,PG_BITS-5))

     )

-    dbout = DB_NEG(3.0);

+    dbout = DB_NEG(3);

   else

-    dbout = DB_POS(3.0);

+    dbout = DB_POS(3);

 

   return DB2LIN_TABLE[dbout + slot->egout];

 }

@@ -1406,16 +1407,16 @@ calc_slot_hat (OPLL_SLOT *slot, e_int32 pgout_cym, e_uint32 noise)
     )

   {

     if(noise)

-      dbout = DB_NEG(12.0);

+      dbout = DB_NEG(12);

     else

-      dbout = DB_NEG(24.0);

+      dbout = DB_NEG(24);

   }

   else

   {

     if(noise)

-      dbout = DB_POS(12.0);

+      dbout = DB_POS(12);

     else

-      dbout = DB_POS(24.0);

+      dbout = DB_POS(24);

   }

 

   return DB2LIN_TABLE[dbout + slot->egout];