WiimoteEmu: Implement uDraw GameTablet.

Source/Core/Core/CMakeLists.txt

@@ -149,6 +149,7 @@ add_library(core
   HW/WiimoteEmu/Extension/Drums.cpp
   HW/WiimoteEmu/Extension/Guitar.cpp
   HW/WiimoteEmu/Extension/Turntable.cpp
+  HW/WiimoteEmu/Extension/UDrawTablet.cpp
   HW/WiimoteReal/WiimoteReal.cpp
   HW/WiiSave.cpp
   IOS/Device.cpp

Source/Core/Core/Core.vcxproj

@@ -183,6 +183,7 @@
     <ClCompile Include="HW\WiimoteEmu\Extension\Guitar.cpp" />
     <ClCompile Include="HW\WiimoteEmu\Extension\Nunchuk.cpp" />
     <ClCompile Include="HW\WiimoteEmu\Extension\Turntable.cpp" />
+    <ClInclude Include="HW\WiimoteEmu\Extension\UDrawTablet.cpp" />
     <ClCompile Include="HW\WiimoteEmu\I2CBus.cpp" />
     <ClCompile Include="HW\WiimoteEmu\MotionPlus.cpp" />
     <ClCompile Include="HW\WiimoteEmu\Speaker.cpp" />
@@ -451,6 +452,7 @@
     <ClInclude Include="HW\WiimoteEmu\Extension\Guitar.h" />
     <ClInclude Include="HW\WiimoteEmu\Extension\Nunchuk.h" />
     <ClInclude Include="HW\WiimoteEmu\Extension\Turntable.h" />
+    <ClInclude Include="HW\WiimoteEmu\Extension\UDrawTablet.h" />
     <ClInclude Include="HW\WiimoteEmu\I2CBus.h" />
     <ClInclude Include="HW\WiimoteEmu\MotionPlus.h" />
     <ClInclude Include="HW\WiimoteEmu\Speaker.h" />

Source/Core/Core/Core.vcxproj.filters

@@ -910,6 +910,9 @@
     <ClCompile Include="HW\WiimoteEmu\Extension\Turntable.cpp">
       <Filter>HW %28Flipper/Hollywood%29\Wiimote\Emu\Extension</Filter>
     </ClCompile>
+    <ClCompile Include="HW\WiimoteEmu\Extension\UDrawTablet.cpp">
+      <Filter>HW %28Flipper/Hollywood%29\Wiimote\Emu\Extension</Filter>
+    </ClCompile>
     <ClCompile Include="HW\WiimoteEmu\Extension\Extension.cpp">
       <Filter>HW %28Flipper/Hollywood%29\Wiimote\Emu\Extension</Filter>
     </ClCompile>
@@ -1625,6 +1628,9 @@
     <ClInclude Include="HW\WiimoteEmu\Extension\Turntable.h">
       <Filter>HW %28Flipper/Hollywood%29\Wiimote\Emu\Extension</Filter>
     </ClInclude>
+    <ClInclude Include="HW\WiimoteEmu\Extension\UDrawTablet.h">
+      <Filter>HW %28Flipper/Hollywood%29\Wiimote\Emu\Extension</Filter>
+    </ClInclude>
     <ClInclude Include="HW\WiimoteEmu\Extension\Extension.h">
       <Filter>HW %28Flipper/Hollywood%29\Wiimote\Emu\Extension</Filter>
     </ClInclude>
@@ -1638,4 +1644,4 @@
   <ItemGroup>
     <Text Include="CMakeLists.txt" />
   </ItemGroup>
-</Project>
+</Project>

Source/Core/Core/HW/Wiimote.cpp

@@ -65,6 +65,12 @@ ControllerEmu::ControlGroup* GetTurntableGroup(int number, WiimoteEmu::Turntable
       ->GetTurntableGroup(group);
 }
 
+ControllerEmu::ControlGroup* GetUDrawTabletGroup(int number, WiimoteEmu::UDrawTabletGroup group)
+{
+  return static_cast<WiimoteEmu::Wiimote*>(s_config.GetController(number))
+      ->GetUDrawTabletGroup(group);
+}
+
 void Shutdown()
 {
   s_config.UnregisterHotplugCallback();

Source/Core/Core/HW/Wiimote.h

@@ -23,6 +23,7 @@ enum class ClassicGroup;
 enum class GuitarGroup;
 enum class DrumsGroup;
 enum class TurntableGroup;
+enum class UDrawTabletGroup;
 }  // namespace WiimoteEmu
 
 enum
@@ -75,6 +76,7 @@ ControllerEmu::ControlGroup* GetClassicGroup(int number, WiimoteEmu::ClassicGrou
 ControllerEmu::ControlGroup* GetGuitarGroup(int number, WiimoteEmu::GuitarGroup group);
 ControllerEmu::ControlGroup* GetDrumsGroup(int number, WiimoteEmu::DrumsGroup group);
 ControllerEmu::ControlGroup* GetTurntableGroup(int number, WiimoteEmu::TurntableGroup group);
+ControllerEmu::ControlGroup* GetUDrawTabletGroup(int number, WiimoteEmu::UDrawTabletGroup group);
 
 void ControlChannel(int number, u16 channel_id, const void* data, u32 size);
 void InterruptChannel(int number, u16 channel_id, const void* data, u32 size);

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

@@ -6,21 +6,59 @@
 
 #pragma once
 
+#include <array>
+
 #include "Common/CommonTypes.h"
 
 namespace WiimoteEmu
 {
 class EncryptionKey
 {
 public:
-  void Generate(const u8* keydata);
+  void Encrypt(u8* data, u32 addr, u32 len) const;
+  void Decrypt(u8* data, u32 addr, u32 len) const;
+
+  using RandData = std::array<u8, 10>;
+  using KeyData = std::array<u8, 6>;
+
+  void GenerateTables(const RandData& rand, const KeyData& key, const u32 idx, const u8 offset);
+
+  std::array<u8, 8> ft = {};
+  std::array<u8, 8> sb = {};
+};
+
+class KeyGen
+{
+public:
+  virtual ~KeyGen() = default;
 
-  void Encrypt(u8* data, int addr, u8 len) const;
-  void Decrypt(u8* data, int addr, u8 len) const;
+  using ExtKeyData = std::array<u8, 16>;
 
+  EncryptionKey GenerateFromExtensionKeyData(const ExtKeyData& key_data) const;
+
+protected:
+  virtual EncryptionKey::KeyData GenerateKeyData(const EncryptionKey::RandData& rand,
+                                                 u32 idx) const = 0;
+  virtual EncryptionKey GenerateTables(const EncryptionKey::RandData& rand,
+                                       const EncryptionKey::KeyData& key, u32 idx) const = 0;
+};
+
+class KeyGen1stParty final : public KeyGen
+{
+private:
+  EncryptionKey::KeyData GenerateKeyData(const EncryptionKey::RandData& rand,
+                                         u32 idx) const final override;
+  EncryptionKey GenerateTables(const EncryptionKey::RandData& rand,
+                               const EncryptionKey::KeyData& key, u32 idx) const final override;
+};
+
+class KeyGen3rdParty final : public KeyGen
+{
 private:
-  u8 ft[8] = {};
-  u8 sb[8] = {};
+  EncryptionKey::KeyData GenerateKeyData(const EncryptionKey::RandData& rand,
+                                         u32 idx) const final override;
+  EncryptionKey GenerateTables(const EncryptionKey::RandData& rand,
+                               const EncryptionKey::KeyData& key, u32 idx) const final override;
 };
 
 }  // namespace WiimoteEmu

Source/Core/Core/HW/WiimoteEmu/Extension/Classic.cpp

@@ -72,7 +72,7 @@ constexpr std::array<u16, 4> classic_dpad_bitmasks{{
     Classic::PAD_RIGHT,
 }};
 
-Classic::Classic() : EncryptedExtension(_trans("Classic"))
+Classic::Classic() : Extension1stParty(_trans("Classic"))
 {
   // buttons
   groups.emplace_back(m_buttons = new ControllerEmu::Buttons(_trans("Buttons")));
@@ -172,7 +172,8 @@ bool Classic::IsButtonPressed() const
 
 void Classic::Reset()
 {
-  m_reg = {};
+  EncryptedExtension::Reset();
+
   m_reg.identifier = classic_id;
 
   // Build calibration data:

Source/Core/Core/HW/WiimoteEmu/Extension/Classic.h

@@ -26,7 +26,7 @@ enum class ClassicGroup
   RightStick
 };
 
-class Classic : public EncryptedExtension
+class Classic : public Extension1stParty
 {
 public:
   union ButtonFormat

Source/Core/Core/HW/WiimoteEmu/Extension/Drums.cpp

@@ -44,7 +44,7 @@ constexpr std::array<u16, 2> drum_button_bitmasks{{
     Drums::BUTTON_PLUS,
 }};
 
-Drums::Drums() : EncryptedExtension(_trans("Drums"))
+Drums::Drums() : Extension1stParty(_trans("Drums"))
 {
   // pads
   groups.emplace_back(m_pads = new ControllerEmu::Buttons(_trans("Pads")));
@@ -106,7 +106,8 @@ bool Drums::IsButtonPressed() const
 
 void Drums::Reset()
 {
-  m_reg = {};
+  EncryptedExtension::Reset();
+
   m_reg.identifier = drums_id;
 
   // TODO: Is there calibration data?

Source/Core/Core/HW/WiimoteEmu/Extension/Drums.h

@@ -22,8 +22,8 @@ enum class DrumsGroup
   Stick
 };
 
-// TODO: Do the drums ever use encryption?
-class Drums : public EncryptedExtension
+// The Drums use the "1st-party" extension encryption scheme.
+class Drums : public Extension1stParty
 {
 public:
   struct DataFormat

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

@@ -12,6 +12,8 @@
 #include "Common/Compiler.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
 
+#include "Common/Logging/Log.h"
+
 namespace WiimoteEmu
 {
 Extension::Extension(const char* name) : m_name(name)
@@ -85,15 +87,16 @@ int EncryptedExtension::BusRead(u8 slave_addr, u8 addr, int count, u8* data_out)
 
   auto const result = RawRead(&m_reg, addr, count, data_out);
 
-  // Encrypt data read from extension register
+  // Encrypt data read from extension register.
   if (ENCRYPTION_ENABLED == m_reg.encryption)
   {
-    // INFO_LOG(WIIMOTE, "Encrypted read.");
-    ext_key.Encrypt(data_out, addr, (u8)count);
-  }
-  else
-  {
-    // INFO_LOG(WIIMOTE, "Unencrypted read.");
+    if (m_is_key_dirty)
+    {
+      UpdateEncryptionKey();
+      m_is_key_dirty = false;
+    }
+
+    ext_key.Encrypt(data_out, addr, count);
   }
 
   return result;
@@ -106,24 +109,48 @@ int EncryptedExtension::BusWrite(u8 slave_addr, u8 addr, int count, const u8* da
 
   auto const result = RawWrite(&m_reg, addr, count, data_in);
 
-  // TODO: make this check less ugly:
-  if (addr + count > 0x40 && addr < 0x50)
+  constexpr u8 ENCRYPTION_KEY_DATA_BEGIN = offsetof(Register, encryption_key_data);
+  constexpr u8 ENCRYPTION_KEY_DATA_END = ENCRYPTION_KEY_DATA_BEGIN + 0x10;
+
+  if (addr + count > ENCRYPTION_KEY_DATA_BEGIN && addr < ENCRYPTION_KEY_DATA_END)
   {
-    // Run the key generation on all writes in the key area, it doesn't matter
-    //  that we send it parts of a key, only the last full key will have an effect
-    ext_key.Generate(m_reg.encryption_key_data);
+    // FYI: Real extensions seem to require the key data written in specifically sized chunks.
+    // We just run the key generation on all writes to the key area.
+    m_is_key_dirty = true;
   }
 
   return result;
 }
 
+void EncryptedExtension::Reset()
+{
+  // Clear register state.
+  m_reg = {};
+
+  // Clear encryption key state.
+  ext_key = {};
+  m_is_key_dirty = true;
+}
+
 void EncryptedExtension::DoState(PointerWrap& p)
 {
   p.Do(m_reg);
 
-  // No need to sync this when we can regenerate it:
   if (p.GetMode() == PointerWrap::MODE_READ)
-    ext_key.Generate(m_reg.encryption_key_data);
+  {
+    // No need to sync the key when we can just regenerate it.
+    m_is_key_dirty = true;
+  }
+}
+
+void Extension1stParty::UpdateEncryptionKey()
+{
+  ext_key = KeyGen1stParty().GenerateFromExtensionKeyData(m_reg.encryption_key_data);
+}
+
+void Extension3rdParty::UpdateEncryptionKey()
+{
+  ext_key = KeyGen3rdParty().GenerateFromExtensionKeyData(m_reg.encryption_key_data);
 }
 
 }  // namespace WiimoteEmu

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

@@ -64,7 +64,7 @@ class EncryptedExtension : public Extension
 
   // TODO: This is public for TAS reasons.
   // TODO: TAS handles encryption poorly.
-  WiimoteEmu::EncryptionKey ext_key = {};
+  EncryptionKey ext_key;
 
 protected:
   static constexpr int CALIBRATION_CHECKSUM_BYTES = 2;
@@ -82,7 +82,7 @@ class EncryptedExtension : public Extension
     u8 unknown3[0x10];
 
     // address 0x40
-    u8 encryption_key_data[0x10];
+    std::array<u8, 0x10> encryption_key_data;
     u8 unknown4[0xA0];
 
     // address 0xF0
@@ -98,9 +98,14 @@ class EncryptedExtension : public Extension
 
   Register m_reg = {};
 
+  void Reset() override;
   void DoState(PointerWrap& p) override;
 
+  virtual void UpdateEncryptionKey() = 0;
+
 private:
+  bool m_is_key_dirty = true;
+
   static constexpr u8 ENCRYPTION_ENABLED = 0xaa;
 
   bool ReadDeviceDetectPin() const override;
@@ -109,4 +114,22 @@ class EncryptedExtension : public Extension
   int BusWrite(u8 slave_addr, u8 addr, int count, const u8* data_in) override;
 };
 
+class Extension1stParty : public EncryptedExtension
+{
+protected:
+  using EncryptedExtension::EncryptedExtension;
+
+private:
+  void UpdateEncryptionKey() final override;
+};
+
+class Extension3rdParty : public EncryptedExtension
+{
+protected:
+  using EncryptedExtension::EncryptedExtension;
+
+private:
+  void UpdateEncryptionKey() final override;
+};
+
 }  // namespace WiimoteEmu

Source/Core/Core/HW/WiimoteEmu/Extension/Guitar.cpp

@@ -62,7 +62,7 @@ constexpr std::array<u16, 2> guitar_strum_bitmasks{{
     Guitar::BAR_DOWN,
 }};
 
-Guitar::Guitar() : EncryptedExtension(_trans("Guitar"))
+Guitar::Guitar() : Extension1stParty(_trans("Guitar"))
 {
   // frets
   groups.emplace_back(m_frets = new ControllerEmu::Buttons(_trans("Frets")));
@@ -152,7 +152,8 @@ bool Guitar::IsButtonPressed() const
 
 void Guitar::Reset()
 {
-  m_reg = {};
+  EncryptedExtension::Reset();
+
   m_reg.identifier = guitar_id;
 
   // TODO: Is there calibration data?

Source/Core/Core/HW/WiimoteEmu/Extension/Guitar.h

@@ -27,8 +27,8 @@ enum class GuitarGroup
   SliderBar
 };
 
-// TODO: Does the guitar ever use encryption?
-class Guitar : public EncryptedExtension
+// The Guitar uses the "1st-party" extension encryption scheme.
+class Guitar : public Extension1stParty
 {
 public:
   struct DataFormat

Source/Core/Core/HW/WiimoteEmu/Extension/Nunchuk.cpp

@@ -32,7 +32,7 @@ constexpr std::array<u8, 2> nunchuk_button_bitmasks{{
     Nunchuk::BUTTON_Z,
 }};
 
-Nunchuk::Nunchuk() : EncryptedExtension(_trans("Nunchuk"))
+Nunchuk::Nunchuk() : Extension1stParty(_trans("Nunchuk"))
 {
   // buttons
   groups.emplace_back(m_buttons = new ControllerEmu::Buttons(_trans("Buttons")));
@@ -141,7 +141,8 @@ bool Nunchuk::IsButtonPressed() const
 
 void Nunchuk::Reset()
 {
-  m_reg = {};
+  EncryptedExtension::Reset();
+
   m_reg.identifier = nunchuk_id;
 
   m_swing_state = {};