support all values returned from PTMU_GetBatteryLevel (#116)

and change the battery images style to look more like a battery

include/common.h

@@ -55,6 +55,7 @@ enum TextureID {
     TEXTURE_FONT_RESERVED = 0, // used by pp2d for the font
     TEXTURE_ARROW,
     TEXTURE_SHUFFLE,
+    TEXTURE_BATTERY_0,
     TEXTURE_BATTERY_1,
     TEXTURE_BATTERY_2,
     TEXTURE_BATTERY_3,

source/draw.c

@@ -41,6 +41,7 @@ void init_screens(void)
 
     pp2d_load_texture_png(TEXTURE_ARROW, "romfs:/arrow.png");
     pp2d_load_texture_png(TEXTURE_SHUFFLE, "romfs:/shuffle.png");
+    pp2d_load_texture_png(TEXTURE_BATTERY_0, "romfs:/battery0.png");
     pp2d_load_texture_png(TEXTURE_BATTERY_1, "romfs:/battery1.png");
     pp2d_load_texture_png(TEXTURE_BATTERY_2, "romfs:/battery2.png");
     pp2d_load_texture_png(TEXTURE_BATTERY_3, "romfs:/battery3.png");
@@ -71,9 +72,9 @@ static void draw_base_interface(void)
     #ifndef CITRA_MODE
     u8 battery_charging = 0;
     PTMU_GetBatteryChargeState(&battery_charging);
-    u8 battery_status = 1;
+    u8 battery_status = 0;
     PTMU_GetBatteryLevel(&battery_status);
-    pp2d_draw_texture(TEXTURE_BATTERY_1 + battery_status - 1, 357, 2);
+    pp2d_draw_texture(TEXTURE_BATTERY_0 + battery_status, 357, 2);
 
     if(battery_charging)
         pp2d_draw_texture(TEXTURE_BATTERY_CHARGE, 357, 2);