Added HILO8 support.

Signed-off-by: Patrick Martin <thehairyrock@gmail.com>

src/video_core/color.h

@@ -69,6 +69,16 @@ inline const Math::Vec4<u8> DecodeRGB8(const u8* bytes) {
     return { bytes[2], bytes[1], bytes[0], 255 };
 }
 
+/**
+ * Decode a color stored in HILO8 format
+ * @remark HILO8 is not intended to store colors, the word color here is used just for consistency, HILO8 is a format intended for normal maps.
+ * @param bytes Pointer to encoded source color
+ * @return Result color decoded as Math::Vec4<u8>
+ */
+inline const Math::Vec4<u8> DecodeHILO8(const u8* bytes) {
+    return { bytes[0], bytes[1], 0, 255 };
+}
+
 /**
  * Decode a color stored in RGB565 format
  * @param bytes Pointer to encoded source color
@@ -152,6 +162,16 @@ inline void EncodeRGB8(const Math::Vec4<u8>& color, u8* bytes) {
     bytes[0] = color.b();
 }
 
+/**
+ * Encode a color as HILO8 format
+ * @remark HILO8 is not intended to store colors, the word color here is used just for consistency, HILO8 is a format intended for normal maps.
+ * @param color Source color to encode
+ * @param bytes Destination pointer to store encoded color
+ */
+inline void EncodeHILO8(const Math::Vec4<u8>& color, u8* bytes) {
+    bytes[0] = color.r();
+    bytes[1] = color.g();
+}
 /**
  * Encode a color as RGB565 format
  * @param color Source color to encode

src/video_core/debug_utils/debug_utils.cpp

@@ -361,6 +361,12 @@ const Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const Texture
         }
     }
 
+    case Regs::TextureFormat::HILO8:
+    {
+        auto res = Color::DecodeHILO8(source + VideoCore::GetMortonOffset(x, y, 2));
+        return { res.r(), res.g(), 0, 255 };
+    }
+
     case Regs::TextureFormat::I8:
     {
         const u8* source_ptr = source + VideoCore::GetMortonOffset(x, y, 1);

src/video_core/pica.h

@@ -152,7 +152,7 @@ struct Regs {
         RGB565       =  3,
         RGBA4        =  4,
         IA8          =  5,
-
+        HILO8        =  6,
         I8           =  7,
         A8           =  8,
         IA4          =  9,
@@ -174,6 +174,7 @@ struct Regs {
         case TextureFormat::RGB565:
         case TextureFormat::RGBA4:
         case TextureFormat::IA8:
+        case TextureFormat::HILO8:
             return 4;
 
         case TextureFormat::A4: