Merge pull request dolphin-emu#11354 from Pokechu22/desert-bus-asnd-ucode

DSPHLE: Add Desert Bus libasnd ucode variants

Author: AdmiralCurtiss

Source/Core/Core/HW/DSPHLE/UCodes/ASnd.cpp

@@ -54,9 +54,15 @@ constexpr u32 FLAGS_SAMPLE_FORMAT_BYTES_SHIFT = 16;
 
 constexpr u32 SAMPLE_RATE = 48000;
 
+bool ASndUCode::SwapLeftRight() const
+{
+  return m_crc == HASH_DESERT_BUS_2011 || m_crc == HASH_DESERT_BUS_2012;
+}
+
 bool ASndUCode::UseNewFlagMasks() const
 {
-  return m_crc == HASH_2011 || m_crc == HASH_2020 || m_crc == HASH_2020_PAD;
+  return m_crc == HASH_2011 || m_crc == HASH_2020 || m_crc == HASH_2020_PAD ||
+         m_crc == HASH_DESERT_BUS_2011 || m_crc == HASH_DESERT_BUS_2012;
 }
 
 ASndUCode::ASndUCode(DSPHLE* dsphle, u32 crc) : UCodeInterface(dsphle, crc)
@@ -383,7 +389,13 @@ void ASndUCode::DoMixing(u32 return_mail)
         }
         // Both paths jmpr $AR3, which is an index into sample_selector
 
-        const auto [new_r, new_l] = (this->*sample_function)();
+        auto [new_r, new_l] = (this->*sample_function)();
+        if (SwapLeftRight())
+        {
+          // The Desert Bus versions swapped the left and right input channels so that left
+          // comes first, and then right. Before, right came before left.
+          std::swap(new_r, new_l);
+        }
         // out_samp: "multiply sample x volume" - left is put in $ax0.h, right is put in $ax1.h
 
         // All functions jumped to from sample_selector jump or fall through here (zero_samples also

Source/Core/Core/HW/DSPHLE/UCodes/ASnd.h

@@ -51,6 +51,14 @@ class ASndUCode final : public UCodeInterface
   // https://github.com/extremscorner/libogc2/commit/0b64f879808953d80ba06501a1c079b0fbf017d2
   // https://github.com/extremscorner/libogc-rice/commit/ce22c3269699fdbd474f2f28ca2ffca211954659
   static constexpr u32 HASH_2020_PAD = 0xbad876ef;
+  // Variant used in Desert Bus v1.04 - this is based off of the code in libogc (as it existed in
+  // 2011, even though that code only became used in 2020), but the left and right channels are
+  // swapped. Padded to 0x0620 bytes.
+  static constexpr u32 HASH_DESERT_BUS_2011 = 0xfa9c576f;
+  // Variant used in Desert Bus v1.05 - this is the same as the previous version, except 4 junk
+  // instructions were added to the start, which do not change behavior in any way. Padded to 0x0620
+  // bytes.
+  static constexpr u32 HASH_DESERT_BUS_2012 = 0x614dd145;
 
 private:
   void DMAInVoiceData();
@@ -60,6 +68,7 @@ class ASndUCode final : public UCodeInterface
   void ChangeBuffer();
   void DoMixing(u32 return_mail);
 
+  bool SwapLeftRight() const;
   bool UseNewFlagMasks() const;
 
   std::pair<s16, s16> ReadSampleMono8Bits() const;

Source/Core/Core/HW/DSPHLE/UCodes/UCodes.cpp

@@ -313,6 +313,8 @@ std::unique_ptr<UCodeInterface> UCodeFactory(u32 crc, DSPHLE* dsphle, bool wii)
   case ASndUCode::HASH_2011:
   case ASndUCode::HASH_2020:
   case ASndUCode::HASH_2020_PAD:
+  case ASndUCode::HASH_DESERT_BUS_2011:
+  case ASndUCode::HASH_DESERT_BUS_2012:
     INFO_LOG_FMT(DSPHLE, "CRC {:08x}: ASnd chosen (Homebrew)", crc);
     return std::make_unique<ASndUCode>(dsphle, crc);