WiimoteEmu: Fix wiimote pan setting from keeping center at half volume.

Source/Core/Core/HW/WiimoteCommon/WiimoteConstants.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include "Common/CommonTypes.h"
+
 // Wiimote internal codes
 
 // Communication channels

Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp

@@ -128,13 +128,19 @@ void Wiimote::HidOutputReport(const wm_report* const sr, const bool send_ack)
     break;
 
   case RT_WRITE_SPEAKER_DATA:
-    // Not sure if speaker mute stops the bus write on real hardware, but it's not that important
+    // TODO: Does speaker mute stop speaker data processing?
+    // (important to keep decoder in proper state)
     if (!m_speaker_mute)
     {
       auto sd = reinterpret_cast<const wm_speaker_data*>(sr->data);
-      if (sd->length > 20)
-        PanicAlert("EmuWiimote: bad speaker data length!");
-      SpeakerData(sd->data, sd->length);
+      if (sd->length > ArraySize(sd->data))
+      {
+        ERROR_LOG(WIIMOTE, "Bad speaker data length: %d", sd->length);
+      }
+      else
+      {
+        SpeakerData(sd->data, sd->length);
+      }
     }
     // No ACK:
     return;

Source/Core/Core/HW/WiimoteEmu/Speaker.cpp

@@ -7,6 +7,7 @@
 #include "AudioCommon/AudioCommon.h"
 #include "Common/CommonTypes.h"
 #include "Common/Logging/Log.h"
+#include "Common/MathUtil.h"
 #include "Core/ConfigManager.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
 #include "InputCommon/ControllerEmu/ControlGroup/ControlGroup.h"
@@ -70,12 +71,15 @@ void stopdamnwav()
 
 void Wiimote::SpeakerData(const u8* data, int length)
 {
+  // TODO: should we still process samples for the decoder state?
   if (!SConfig::GetInstance().m_WiimoteEnableSpeaker)
     return;
-  if (m_speaker_logic.reg_data.volume == 0 || m_speaker_logic.reg_data.sample_rate == 0 ||
-      length == 0)
+
+  if (m_speaker_logic.reg_data.sample_rate == 0 || length == 0)
     return;
 
+  // Even if volume is zero we process samples to maintain proper decoder state.
+
   // TODO consider using static max size instead of new
   std::unique_ptr<s16[]> samples(new s16[length * 2]);
 
@@ -87,7 +91,7 @@ void Wiimote::SpeakerData(const u8* data, int length)
     // 8 bit PCM
     for (int i = 0; i < length; ++i)
     {
-      samples[i] = ((s16)(s8)data[i]) << 8;
+      samples[i] = ((s16)(s8)data[i]) * 0x100;
     }
 
     // Following details from http://wiibrew.org/wiki/Wiimote#Speaker
@@ -107,9 +111,6 @@ void Wiimote::SpeakerData(const u8* data, int length)
 
     // Following details from http://wiibrew.org/wiki/Wiimote#Speaker
     sample_rate_dividend = 6000000;
-
-    // 0 - 127
-    // TODO: does it go beyond 127 for format == 0x40?
     volume_divisor = 0x7F;
     sample_length = (unsigned int)length * 2;
   }
@@ -119,19 +120,23 @@ void Wiimote::SpeakerData(const u8* data, int length)
     return;
   }
 
+  if (m_speaker_logic.reg_data.volume > volume_divisor)
+  {
+    DEBUG_LOG(IOS_WIIMOTE, "Wiimote volume is higher than suspected maximum!");
+    volume_divisor = m_speaker_logic.reg_data.volume;
+  }
+
   // Speaker Pan
-  // TODO: fix
-  unsigned int vol = (unsigned int)(m_options->numeric_settings[0]->GetValue() * 100);
+  // GUI clamps pan setting from -127 to 127. Why?
+  const auto pan = (unsigned int)(m_options->numeric_settings[0]->GetValue() * 100);
 
-  unsigned int sample_rate = sample_rate_dividend / m_speaker_logic.reg_data.sample_rate;
+  const unsigned int sample_rate = sample_rate_dividend / m_speaker_logic.reg_data.sample_rate;
   float speaker_volume_ratio = (float)m_speaker_logic.reg_data.volume / volume_divisor;
-  unsigned int left_volume = (unsigned int)((128 + vol) * speaker_volume_ratio);
-  unsigned int right_volume = (unsigned int)((128 - vol) * speaker_volume_ratio);
-
-  if (left_volume > 255)
-    left_volume = 255;
-  if (right_volume > 255)
-    right_volume = 255;
+  // Sloppy math:
+  unsigned int left_volume =
+      MathUtil::Clamp<unsigned int>((0xff + (2 * pan)) * speaker_volume_ratio, 0, 0xff);
+  unsigned int right_volume =
+      MathUtil::Clamp<unsigned int>((0xff - (2 * pan)) * speaker_volume_ratio, 0, 0xff);
 
   g_sound_stream->GetMixer()->SetWiimoteSpeakerVolume(left_volume, right_volume);
 
@@ -161,4 +166,4 @@ void Wiimote::SpeakerData(const u8* data, int length)
   num++;
 #endif
 }
-}
+}  // namespace WiimoteEmu

Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.cpp

@@ -1276,7 +1276,7 @@ void Wiimote::MotionPlusLogic::Update()
 
     // A real wiimote takes about 2 seconds to reach this state:
     reg_data.cert_ready = 0x1a;
-    INFO_LOG(WIIMOTE, "M+ cert 2 ready!", reg_data.cert_ready);
+    INFO_LOG(WIIMOTE, "M+ cert 2 ready!");
   }
 
   // TODO: make sure a motion plus report is sent first after init
@@ -1364,7 +1364,7 @@ void Wiimote::MotionPlusLogic::Update()
       break;
     }
     default:
-      PanicAlert("MotionPlus unknown passthrough-mode %d", GetPassthroughMode());
+      PanicAlert("MotionPlus unknown passthrough-mode %d", (int)GetPassthroughMode());
       break;
     }
   }

Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h

@@ -540,6 +540,7 @@ class Wiimote : public ControllerEmu::EmulatedController
 
     static_assert(0x100 == sizeof(reg_data));
 
+    // TODO: What actions should reset this state?
     ADPCMState adpcm_state;
 
     static const u8 DEVICE_ADDR = 0x51;
@@ -564,6 +565,8 @@ class Wiimote : public ControllerEmu::EmulatedController
       }
       else
       {
+        // TODO: Does writing immediately change the decoder config even when active
+        // or does a write to 0x08 activate the new configuration or something?
         return RawWrite(&reg_data, addr, count, data_in);
       }
     }