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Avoid unnecessary floating-point math

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This commit is contained in:
Chris Robinson 2008-11-11 17:59:55 -08:00
parent fc4c867f27
commit da684564ea
1 changed files with 2 additions and 5 deletions
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7
OpenAL32/alSource.c
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@ -2106,15 +2106,12 @@ static ALboolean GetSourceOffset(ALsource *pSource, ALenum eName, ALfloat *pflOf
if ((eOriginalFormat == AL_FORMAT_MONO_IMA4) || if ((eOriginalFormat == AL_FORMAT_MONO_IMA4) ||
(eOriginalFormat == AL_FORMAT_STEREO_IMA4)) (eOriginalFormat == AL_FORMAT_STEREO_IMA4))
{ {
// Compression rate of the ADPCM supported is 3.6111 to 1
readPos = (ALint)((ALfloat)readPos / 3.6111f);
writePos = (ALint)((ALfloat)writePos / 3.6111f);
// Round down to nearest ADPCM block // Round down to nearest ADPCM block
pflOffset[0] = (ALfloat)((readPos / (36 * lChannels)) * 36 * lChannels); pflOffset[0] = (ALfloat)((readPos / (65 * 2 * lChannels)) * 36 * lChannels);
if(pSource->state == AL_PLAYING) if(pSource->state == AL_PLAYING)
{ {
// Round up to nearest ADPCM block // Round up to nearest ADPCM block
pflOffset[1] = (ALfloat)(((writePos + (36 * lChannels) - 1) / (36 * lChannels)) * 36 * lChannels); pflOffset[1] = (ALfloat)(((writePos + (65 * 2 * lChannels) - 1) / (65 * 2 * lChannels)) * 36 * lChannels);
} }
else else
pflOffset[1] = pflOffset[0]; pflOffset[1] = pflOffset[0];