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Further work on libgme's emu2413. Fully remove floating point, introduce another precalculated table, directly use predefined tables instead of copying them. Reduces memory and codesize by several KB.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30494 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2011-09-10 10:45:44 +00:00
parent e8dc7a6d07
commit 4096cb1830
2 changed files with 87 additions and 27 deletions
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66
apps/codecs/libgme/emu2413.c
View file

@ -182,8 +182,21 @@ static e_uint16 halfsintable[PG_WIDTH];
static e_uint16 *waveform[2] = { fullsintable, halfsintable };
/* LFO Table */
#ifdef EMU2413_CALCUL_TABLES
static e_int32 pmtable[PM_PG_WIDTH];
static e_int32 amtable[AM_PG_WIDTH];
#define PMTABLE(x) pmtable[x]
#define AMTABLE(x) amtable[x]
#else
#define PMTABLE(x) (e_int32)pm_coeff[x]
#if (PM_PG_WIDTH != 256)
#error PM_PG_WIDTH must be set to 256 if EMU2413_CALCUL_TABLES is not defined
#endif
#define AMTABLE(x) (e_int32)am_coeff[x]
#if (AM_PG_WIDTH != 256)
#error AM_PG_WIDTH must be set to 256 if EMU2413_CALCUL_TABLES is not defined
#endif
#endif
/* Phase delta for LFO */
static e_uint32 pm_dphase;
@ -193,7 +206,15 @@ static e_uint32 am_dphase;
static e_int16 DB2LIN_TABLE[(DB_MUTE + DB_MUTE) * 2];
/* Liner to Log curve conversion table (for Attack rate). */
static e_uint16 AR_ADJUST_TABLE[1 << EG_BITS];
#ifdef EMU2413_CALCUL_TABLES
static e_uint16 ar_adjust_table[1 << EG_BITS];
#define AR_ADJUST_TABLE(x) ar_adjust_table[x]
#else
#define AR_ADJUST_TABLE(x) ar_adjust_coeff[x]
#if (EG_BITS != 7)
#error EG_BITS must be set to 7 if EMU2413_CALCUL_TABLES is not defined
#endif
#endif
/* Empty voice data */
static OPLL_PATCH null_patch = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
@ -225,6 +246,7 @@ static e_uint32 dphaseTable[512][8][16];
Create tables
****************************************************/
#ifdef EMU2413_CALCUL_TABLES
INLINE static e_int32
Min (e_int32 i, e_int32 j)
{
@ -240,15 +262,11 @@ makeAdjustTable (void)
{
e_int32 i;
AR_ADJUST_TABLE[0] = (1 << EG_BITS) - 1;
ar_adjust_table[0] = (1 << EG_BITS) - 1;
for (i = 1; i < (1<<EG_BITS); i++)
#ifdef EMU2413_CALCUL_TABLES
AR_ADJUST_TABLE[i] = (e_uint16) ((double) (1<<EG_BITS)-1 - ((1<<EG_BITS)-1)*log(i)/log(127));
#else
AR_ADJUST_TABLE[i] = ar_adjust_coeff[i];
#endif
ar_adjust_table[i] = (e_uint16) ((double) (1<<EG_BITS)-1 - ((1<<EG_BITS)-1)*log(i)/log(127));
}
#endif
/* Table for dB(0 -- (1<<DB_BITS)-1) to Liner(0 -- DB2LIN_AMP_WIDTH) */
static void
@ -308,6 +326,7 @@ makeSinTable (void)
halfsintable[i] = fullsintable[0];
}
#ifdef EMU2413_CALCUL_TABLES
static double saw(double phase)
{
if(phase <= PI/2)
@ -326,11 +345,7 @@ makePmTable (void)
for (i = 0; i < PM_PG_WIDTH; i++)
/* pmtable[i] = (e_int32) ((double) PM_AMP * pow (2, (double) PM_DEPTH * sin (2.0 * PI * i / PM_PG_WIDTH) / 1200)); */
#ifdef EMU2413_CALCUL_TABLES
pmtable[i] = (e_int32) ((double) PM_AMP * pow (2, (double) PM_DEPTH * saw (2.0 * PI * i / PM_PG_WIDTH) / 1200));
#else
pmtable[i] = pm_coeff[i];
#endif
}
/* Table for Amp Modulator */
@ -343,6 +358,7 @@ makeAmTable (void)
/* amtable[i] = (e_int32) ((double) AM_DEPTH / 2 / DB_STEP * (1.0 + sin (2.0 * PI * i / PM_PG_WIDTH))); */
amtable[i] = (e_int32) ((double) AM_DEPTH / 2 / DB_STEP * (1.0 + saw (2.0 * PI * i / PM_PG_WIDTH)));
}
#endif
#if !defined(ROCKBOX)
/* Phase increment counter table */
@ -363,9 +379,10 @@ makeDphaseTable (void)
static void
makeTllTable (void)
{
#define dB2(x) ((x)*2)
/* Multiplication owith 8 to have an integer result. This allows to remove floating point operation. */
#define dB2(x) (int)((x)*2*8)
static double kltable[16] = {
static int kltable[16] = {
dB2 ( 0.000), dB2 ( 9.000), dB2 (12.000), dB2 (13.875), dB2 (15.000), dB2 (16.125), dB2 (16.875), dB2 (17.625),
dB2 (18.000), dB2 (18.750), dB2 (19.125), dB2 (19.500), dB2 (19.875), dB2 (20.250), dB2 (20.625), dB2 (21.000)
};
@ -384,11 +401,12 @@ makeTllTable (void)
}
else
{
tmp = (e_int32) (kltable[fnum] - dB2 (3.000) * (7 - block));
tmp = (e_int32) ((kltable[fnum] - dB2 (3.000) * (7 - block))/8);
if (tmp <= 0)
tllTable[fnum][block][TL][KL] = TL2EG (TL);
else
tllTable[fnum][block][TL][KL] = (e_uint32) ((tmp >> (3 - KL)) / EG_STEP) + TL2EG (TL);
/* tllTable[fnum][block][TL][KL] = (e_uint32) ((tmp >> (3 - KL)) / EG_STEP) + TL2EG (TL); */
tllTable[fnum][block][TL][KL] = (e_uint32) ((tmp << KL) / (int)(EG_STEP*8)) + TL2EG (TL);
}
}
}
@ -727,7 +745,7 @@ INLINE static void
slotOff (OPLL_SLOT * slot)
{
if (slot->eg_mode == ATTACK)
slot->eg_phase = EXPAND_BITS (AR_ADJUST_TABLE[HIGHBITS (slot->eg_phase, EG_DP_BITS - EG_BITS)], EG_BITS, EG_DP_BITS);
slot->eg_phase = EXPAND_BITS (AR_ADJUST_TABLE(HIGHBITS (slot->eg_phase, EG_DP_BITS - EG_BITS)), EG_BITS, EG_DP_BITS);
slot->eg_mode = RELEASE;
UPDATE_EG(slot);
}
@ -993,8 +1011,8 @@ internal_refresh (void)
#endif
makeDphaseARTable ();
makeDphaseDRTable ();
pm_dphase = (e_uint32) RATE_ADJUST (PM_SPEED * PM_DP_WIDTH / (clk / 72));
am_dphase = (e_uint32) RATE_ADJUST (AM_SPEED * AM_DP_WIDTH / (clk / 72));
pm_dphase = (e_uint32) RATE_ADJUST ((int)(PM_SPEED * PM_DP_WIDTH) / (clk / 72));
am_dphase = (e_uint32) RATE_ADJUST ((int)(AM_SPEED * AM_DP_WIDTH) / (clk / 72));
}
static void
@ -1003,10 +1021,12 @@ maketables (e_uint32 c, e_uint32 r)
if (c != clk)
{
clk = c;
#ifdef EMU2413_CALCUL_TABLES
makePmTable ();
makeAmTable ();
makeDB2LinTable ();
makeAdjustTable ();
#endif
makeDB2LinTable ();
makeTllTable ();
makeRksTable ();
makeSinTable ();
@ -1173,8 +1193,8 @@ update_ampm (OPLL * opll)
{
opll->pm_phase = (opll->pm_phase + pm_dphase) & (PM_DP_WIDTH - 1);
opll->am_phase = (opll->am_phase + am_dphase) & (AM_DP_WIDTH - 1);
opll->lfo_am = amtable[HIGHBITS (opll->am_phase, AM_DP_BITS - AM_PG_BITS)];
opll->lfo_pm = pmtable[HIGHBITS (opll->pm_phase, PM_DP_BITS - PM_PG_BITS)];
opll->lfo_am = AMTABLE(HIGHBITS (opll->am_phase, AM_DP_BITS - AM_PG_BITS));
opll->lfo_pm = PMTABLE(HIGHBITS (opll->pm_phase, PM_DP_BITS - PM_PG_BITS));
}
/* PG */
@ -1215,7 +1235,7 @@ calc_envelope (OPLL_SLOT * slot, e_int32 lfo)
switch (slot->eg_mode)
{
case ATTACK:
egout = AR_ADJUST_TABLE[HIGHBITS (slot->eg_phase, EG_DP_BITS - EG_BITS)];
egout = AR_ADJUST_TABLE(HIGHBITS (slot->eg_phase, EG_DP_BITS - EG_BITS));
slot->eg_phase += slot->eg_dphase;
if((EG_DP_WIDTH & slot->eg_phase)||(slot->patch->AR==15))
{

42
apps/codecs/libgme/emutables.h
View file

@ -28,7 +28,7 @@ static const e_uint16 sin_coeff[] = {
0, 0,
};
static const e_int32 pm_coeff[] = {
static const e_int16 pm_coeff[] = {
256, 256, 256, 256, 256, 256, 256,
256, 256, 256, 256, 256, 256, 256,
256, 256, 256, 256, 256, 256, 256,
@ -68,6 +68,46 @@ static const e_int32 pm_coeff[] = {
255, 255, 255, 255,
};
static const e_int8 am_coeff[] = {
13, 13, 13, 13, 13, 14, 14,
14, 14, 14, 15, 15, 15, 15,
15, 16, 16, 16, 16, 16, 17,
17, 17, 17, 17, 18, 18, 18,
18, 18, 19, 19, 19, 19, 19,
20, 20, 20, 20, 20, 21, 21,
21, 21, 21, 22, 22, 22, 22,
22, 23, 23, 23, 23, 23, 24,
24, 24, 24, 24, 25, 25, 25,
25, 26, 25, 25, 25, 25, 24,
24, 24, 24, 24, 23, 23, 23,
23, 23, 22, 22, 22, 22, 22,
21, 21, 21, 21, 21, 20, 20,
20, 20, 20, 19, 19, 19, 19,
19, 18, 18, 18, 18, 18, 17,
17, 17, 17, 17, 16, 16, 16,
16, 16, 15, 15, 15, 15, 15,
14, 14, 14, 14, 14, 13, 13,
13, 13, 13, 12, 12, 12, 12,
11, 11, 11, 11, 11, 10, 10,
10, 10, 10, 9, 9, 9, 9,
9, 8, 8, 8, 8, 8, 7,
7, 7, 7, 7, 6, 6, 6,
6, 6, 5, 5, 5, 5, 5,
4, 4, 4, 4, 4, 3, 3,
3, 3, 3, 2, 2, 2, 2,
2, 1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 2,
2, 2, 2, 2, 3, 3, 3,
3, 3, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 6, 6,
6, 6, 6, 7, 7, 7, 7,
7, 8, 8, 8, 8, 8, 9,
9, 9, 9, 9, 10, 10, 10,
10, 10, 11, 11, 11, 11, 11,
12, 12, 12, 12,
};
static const e_int16 db2lin_coeff[] = {
255, 249, 244, 239, 233, 228, 224,
219, 214, 209, 205, 201, 196, 192,