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ZeldaHLE: Implement patterns 2/3 automatic regeneration.

This commit is contained in:
Pierre Bourdon 2015-08-09 03:39:26 +02:00
parent dd1cb88e9a
commit a602466e4f
1 changed files with 18 additions and 1 deletions
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19
Source/Core/Core/HW/DSPHLE/UCodes/Zelda.cpp
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@ -929,7 +929,24 @@ void ZeldaAudioRenderer::PrepareFrame()
m_buf_back_left_reverb.fill(0);
m_buf_back_right_reverb.fill(0);
// TODO: Prepare patterns 2/3 - they are not constant unlike 0/1.
// Prepare patterns 2/3 - they are not constant unlike 0/1.
s16* pattern2 = m_const_patterns.data() + 2 * 0x40;
s32 yn2 = pattern2[0x40 - 2], yn1 = pattern2[0x40 - 1], v;
for (int i = 0; i < 0x40; i += 2)
{
v = yn2 * yn1 - (pattern2[i] << 16);
yn2 = yn1; yn1 = pattern2[i]; pattern2[i] = v >> 16;
v = 2 * (yn2 * yn1 + (pattern2[i + 1] << 16));
yn2 = yn1; yn1 = pattern2[i + 1]; pattern2[i + 1] = v >> 16;
}
s16* pattern3 = m_const_patterns.data() + 3 * 0x40;
yn2 = pattern3[0x40 - 2]; yn1 = pattern3[0x40 - 1];
s16 acc = yn1;
s16 step = pattern3[0] + ((yn1 * yn2 + ((yn2 << 16) + yn1)) >> 16);
step = (step & 0x1FF) | 0x2000;
for (s32 i = 0; i < 0x40; ++i)
pattern3[i] = acc + (i + 1) * step;
m_prepared = true;
}