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ZeldaHLE: Implement constant patterns with variable step (sample source 0A).

This commit is contained in:
Pierre Bourdon 2015-08-09 00:56:48 +02:00
parent fbe727b0bb
commit 090723167f
1 changed files with 15 additions and 8 deletions
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23
Source/Core/Core/HW/DSPHLE/UCodes/Zelda.cpp
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@ -758,6 +758,7 @@ struct ZeldaAudioRenderer::VPB
// Simple pattern stored in the data downloaded by command 01. Playback
// frequency is controlled by the resampling ratio.
SRC_CONST_PATTERN_0 = 7,
SRC_CONST_PATTERN_0_VARIABLE_STEP = 10,
SRC_CONST_PATTERN_1 = 4,
SRC_CONST_PATTERN_2 = 11,
SRC_CONST_PATTERN_3 = 12,
@ -1320,27 +1321,33 @@ void ZeldaAudioRenderer::LoadInputSamples(MixingBuffer* buffer, VPB* vpb)
}
case VPB::SRC_CONST_PATTERN_0:
case VPB::SRC_CONST_PATTERN_0_VARIABLE_STEP:
case VPB::SRC_CONST_PATTERN_1:
case VPB::SRC_CONST_PATTERN_2:
case VPB::SRC_CONST_PATTERN_3:
{
const u16 PATTERN_SIZE = 0x40;
std::map<u16, u16> samples_source_to_pattern = {
{ VPB::SRC_CONST_PATTERN_0, 0 },
{ VPB::SRC_CONST_PATTERN_1, 1 },
{ VPB::SRC_CONST_PATTERN_2, 2 },
{ VPB::SRC_CONST_PATTERN_3, 3 },
struct PatternInfo { u16 idx; bool variable_step; };
std::map<u16, PatternInfo> samples_source_to_pattern = {
{ VPB::SRC_CONST_PATTERN_0, {0, false} },
{ VPB::SRC_CONST_PATTERN_0_VARIABLE_STEP, {0, true} },
{ VPB::SRC_CONST_PATTERN_1, {1, false} },
{ VPB::SRC_CONST_PATTERN_2, {2, false} },
{ VPB::SRC_CONST_PATTERN_3, {3, false} },
};
u16 pattern_idx = samples_source_to_pattern[vpb->samples_source_type];
u16 pattern_offset = pattern_idx * PATTERN_SIZE;
auto& pattern_info = samples_source_to_pattern[vpb->samples_source_type];
u16 pattern_offset = pattern_info.idx * PATTERN_SIZE;
s16* pattern = m_const_patterns.data() + pattern_offset;
u32 pos = vpb->current_pos_frac << 6; // log2(PATTERN_SIZE)
u32 step = vpb->resampling_ratio << 5;
for (size_t i = 0; i < buffer->size(); ++i)
{
u32 step = vpb->resampling_ratio << 5;
if (pattern_info.variable_step)
step += (u32)((u16)m_buf_back_right[i] * vpb->resampling_ratio) >> 10;
(*buffer)[i] = pattern[pos >> 16];
pos = (pos + step) % (PATTERN_SIZE << 16);
}