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Finishing all Echo functions

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This commit is contained in:
Melefo
2021-02-05 17:29:37 +01:00
parent bdd0f2375d
commit b33d816b62
2 changed files with 51 additions and 5 deletions
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sources/APU/DSP/DSP.hpp
+5
View File
@@ -48,10 +48,14 @@ namespace ComSquare::APU::DSP
uint8_t data;
//! @brief Offset position after data start
uint16_t offset;
//! @brief offset maximum
uint16_t length;
//! @brief Echo delay size register (EDL)
uint8_t delay;
//! @brief Echo enabled (5th bit FLG)
bool enabled = true;
//! @brief Application of enabled to channels.
bool toggle;
//! @brief Last sound produced for each voice in each channel
std::array<std::array<int16_t, 8>, 2> history;
//! @brief Current position inside history
@@ -417,6 +421,7 @@ namespace ComSquare::APU::DSP
int32_t loadFIR(bool channel, int fir);
void loadEcho(bool channel);
int16_t outputEcho(bool channel);
void writeEcho(bool channel);
void timerTick();
bool timerPoll(uint32_t rate);
sources/APU/DSP/Echo.cpp
+46 -5
View File
@@ -23,6 +23,18 @@ namespace ComSquare::APU::DSP
this->_echo.history[channel][this->_echo.historyOffset] = echo >> 1;
}
void DSP::writeEcho(bool channel)
{
if (!this->_echo.toggle) {
uint16_t address = this->_echo.address + channel * 2;
int16_t sample = this->_echo.output[channel];
this->_writeRAM(address++, sample);
this->_writeRAM(address, sample >> 8);
}
this->_echo.output[channel] = 0;
}
int16_t DSP::outputEcho(bool channel)
{
int16_t master = this->_master.output[channel] * this->_master.volume[channel] >> 7;
@@ -93,36 +105,65 @@ namespace ComSquare::APU::DSP
void DSP::echo28()
{
this->_echo.toggle = this->_echo.enabled;
}
void DSP::echo29()
{
this->_echo.value = this->_echo.data;
if (!this->_echo.offset)
this->_echo.length = this->_echo.delay << 11;
this->_echo.offset += 4;
if (this->_echo.offset >= this->_echo.length)
this->_echo.offset = 0;
this->writeEcho(0);
echo28();
}
void DSP::echo30()
{
this->writeEcho(1);
}
void DSP::misc27()
{
for (int i = 0; i < 8; i++)
this->_voices[i].prevPmon = this->_voices[i].pmon;
}
void DSP::misc28()
{
for (int i = 0; i < 8; i++)
this->_voices[i].tempNon = this->_voices[i].non;
this->_brr.offsetAddr = this->_brr.offset;
}
void DSP::misc29()
{
this->_timer.sample = !this->_timer.sample;
if (this->_timer.sample) {
for (int i = 0; i < 8; i++)
this->_voices[i].kon = 0;
}
}
void DSP::misc30()
{
if (this->_timer.sample) {
for (int i = 0; i < 8; i++)
this->_voices[i].kof = 0;
}
this->timerTick();
if (!this->timerPoll(this->_noise.clock))
return;
int32_t feedback = this->_noise.lfsr << 13 ^ this->_noise.lfsr << 14;
this->_noise.lfsr = feedback & 0x4000 ^ this->_noise.lfsr >> 1;
}
}