Add CGB palette and bank number support for api/sprite.py

pyboy/api/sprite.pxd

@@ -19,7 +19,8 @@ cdef class Sprite:
     cdef readonly bint attr_obj_bg_priority
     cdef readonly bint attr_y_flip
     cdef readonly bint attr_x_flip
-    cdef readonly bint attr_palette_number
+    cdef readonly int attr_palette_number
+    cdef readonly bint attr_cgb_bank_number
     cdef readonly tuple shape
     cdef readonly list tiles
     cdef readonly bint on_screen

pyboy/api/sprite.py

@@ -116,7 +116,18 @@ def __init__(self, mb, sprite_index):
             The state of the bit in the attributes lookup.
         """
 
-        self.attr_palette_number = _bit(attr, 4)
+        self.attr_palette_number = 0
+        """
+        To better understand this values, look in the [Pan Docs: VRAM Sprite Attribute Table
+        (OAM)](https://gbdev.io/pandocs/OAM.html).
+
+        Returns
+        -------
+        int:
+            The state of the bit(s) in the attributes lookup.
+        """
+
+        self.attr_cgb_bank_number = 0
         """
         To better understand this values, look in the [Pan Docs: VRAM Sprite Attribute Table
         (OAM)](https://gbdev.io/pandocs/OAM.html).
@@ -127,6 +138,12 @@ def __init__(self, mb, sprite_index):
             The state of the bit in the attributes lookup.
         """
 
+        if self.mb.cgb:
+            self.attr_palette_number = attr & 0b111
+            self.attr_cgb_bank_number = _bit(attr, 3)
+        else:
+            self.attr_palette_number = _bit(attr, 4)
+
         LCDC = LCDCRegister(self.mb.getitem(LCDC_OFFSET))
         sprite_height = 16 if LCDC._get_sprite_height() else 8
         self.shape = (8, sprite_height)