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desmume
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change back to linear interpolation in SPU. it seems a bit extravagant now. perhaps we should make it configurable.. or, for luigi__'s consideration, I added a commented-out cos lookup table instead of doing the full call to cos()

This commit is contained in:
zeromus 2009-01-26 07:55:36 +00:00
parent 990c2a062e
commit 9689548ac8
1 changed files with 15 additions and 3 deletions
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16
desmume/src/SPU.cpp
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@ -21,6 +21,8 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#define _USE_MATH_DEFINES
#include <math.h> #include <math.h>
#include "debug.h" #include "debug.h"
@ -143,10 +145,15 @@ SoundInterface_struct *SPU_SoundCore()
////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////
//static double cos_lut[256];
int SPU_Init(int coreid, int buffersize) int SPU_Init(int coreid, int buffersize)
{ {
int i, j; int i, j;
//for(int i=0;i<256;i++)
// cos_lut[i] = cos(i/256.0*M_PI);
SPU_core = new SPU_struct(740); SPU_core = new SPU_struct(740);
SPU_Reset(); SPU_Reset();
@ -616,9 +623,14 @@ void SPU_WriteLong(u32 addr, u32 val)
#ifdef SPU_INTERPOLATE #ifdef SPU_INTERPOLATE
static s32 Interpolate(s32 a, s32 b, double ratio) static s32 Interpolate(s32 a, s32 b, double ratio)
{ {
//ratio = ratio - (int)ratio;
//double ratio2 = ((1.0f - cos(ratio * 3.14f)) / 2.0f);
////double ratio2 = (1.0f - cos_lut[((int)(ratio*256.0))&0xFF]) / 2.0f;
//return (((1-ratio2)*a) + (ratio2*b));
//linear interpolation
ratio = ratio - (int)ratio; ratio = ratio - (int)ratio;
double ratio2 = ((1.0f - cos(ratio * 3.14f)) / 2.0f); return (1-ratio)*a + ratio*b;
return (((1-ratio2)*a) + (ratio2*b));
} }
#endif #endif