butano: core::init waits for v-blank before initializing all butano s…

…ubsystems

butano/hw/include/bn_hw_core.h

@@ -15,6 +15,17 @@ extern "C"
 
 namespace bn::hw::core
 {
+    inline void init()
+    {
+        while(REG_VCOUNT != 160)
+        {
+        }
+
+        while(REG_VCOUNT != 161)
+        {
+        }
+    }
+
     inline void wait_for_vblank()
     {
         if(REG_VCOUNT == 159)

butano/include/bn_documentation.h

@@ -2121,6 +2121,7 @@
  * @section changelog_15_3_0 15.3.0 (next release)
  *
  * * bn::top_left_rect and bn::top_left_fixed_rect added.
+ * * bn::core::init waits for V-Blank before initializing all Butano subsystems.
  * * Slow game pak detection fixed.
  * * bn::rect issues with odd dimensions documented.
  *

butano/src/bn_core.cpp

@@ -305,6 +305,9 @@ void init()
 
 void init(const string_view& keypad_commands)
 {
+    // Initial wait:
+    hw::core::init();
+
     // Init irq system:
     hw::irq::init();
     hw::irq::set_isr(hw::irq::id::HBLANK, hw::hblank_effects::_intr);
@@ -335,16 +338,17 @@ void init(const string_view& keypad_commands)
     bg_blocks_manager::init();
     keypad_manager::init(keypad_commands);
 
-    // Init timer system:
-    hw::timer::init();
-    data.cpu_usage_timer.restart();
-
     // First update:
     update();
 
     // Keypad polling fix:
     keypad_manager::update();
 
+    // Init timer system:
+    hw::timer::init();
+    data.cpu_usage_timer.restart();
+    data.last_ticks = ticks();
+
     // Reset profiler:
     BN_PROFILER_RESET();
 }