diff options
Diffstat (limited to 'source/dsp1emu.c')
| -rw-r--r-- | source/dsp1emu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/source/dsp1emu.c b/source/dsp1emu.c index 3e34795..6ed470c 100644 --- a/source/dsp1emu.c +++ b/source/dsp1emu.c @@ -301,24 +301,28 @@ const int16_t DSP1_SinTable[256] = int16_t DSP1_Sin(int16_t Angle) { + int32_t S; + if (Angle < 0) { if (Angle == -32768) return 0; return -DSP1_Sin(-Angle); } - int32_t S = DSP1_SinTable[Angle >> 8] + (DSP1_MulTable[Angle & 0xff] * DSP1_SinTable[0x40 + (Angle >> 8)] >> 15); + S = DSP1_SinTable[Angle >> 8] + (DSP1_MulTable[Angle & 0xff] * DSP1_SinTable[0x40 + (Angle >> 8)] >> 15); if (S > 32767) S = 32767; return (int16_t) S; } int16_t DSP1_Cos(int16_t Angle) { + int32_t S; + if (Angle < 0) { if (Angle == -32768) return -32768; Angle = -Angle; } - int32_t S = DSP1_SinTable[0x40 + (Angle >> 8)] - (DSP1_MulTable[Angle & 0xff] * DSP1_SinTable[Angle >> 8] >> 15); + S = DSP1_SinTable[0x40 + (Angle >> 8)] - (DSP1_MulTable[Angle & 0xff] * DSP1_SinTable[Angle >> 8] >> 15); if (S < -32768) S = -32767; return (int16_t) S; } |