From 621ee10eae0546d4ec3f9e911e113aa9ee609c22 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Tue, 26 May 2015 11:00:26 -0500
Subject: Applets: Add infrastructure to allow custom drawing and input
 handling in Applets.

---
 src/core/hle/applets/applet.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'src/core/hle/applets/applet.cpp')

diff --git a/src/core/hle/applets/applet.cpp b/src/core/hle/applets/applet.cpp
index 1f447e5fc..689f5adc8 100644
--- a/src/core/hle/applets/applet.cpp
+++ b/src/core/hle/applets/applet.cpp
@@ -5,15 +5,35 @@
 #include "common/assert.h"
 #include "common/logging/log.h"
 
+#include "core/core_timing.h"
 #include "core/hle/applets/applet.h"
 #include "core/hle/applets/swkbd.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+// Specializes std::hash for AppletId, so that we can use it in std::unordered_map.
+// Workaround for libstdc++ bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60970
+namespace std {
+    template <>
+    struct hash<Service::APT::AppletId> {
+        typedef Service::APT::AppletId argument_type;
+        typedef std::size_t result_type;
+
+        result_type operator()(const argument_type& id_code) const {
+            typedef std::underlying_type<argument_type>::type Type;
+            return std::hash<Type>()(static_cast<Type>(id_code));
+        }
+    };
+}
+
 namespace HLE {
 namespace Applets {
 
 static std::unordered_map<Service::APT::AppletId, std::shared_ptr<Applet>> applets;
+static u32 applet_update_event = -1; ///< The CoreTiming event identifier for the Applet update callback.
+/// The interval at which the Applet update callback will be called.
+static const u64 applet_update_interval_microseconds = 16666;
+std::shared_ptr<Applet> g_current_applet = nullptr; ///< The applet that is currently executing
 
 ResultCode Applet::Create(Service::APT::AppletId id) {
     switch (id) {
@@ -36,5 +56,23 @@ std::shared_ptr<Applet> Applet::Get(Service::APT::AppletId id) {
     return nullptr;
 }
 
+/// Handles updating the current Applet every time it's called.
+static void AppletUpdateEvent(u64, int cycles_late) {
+    if (g_current_applet && g_current_applet->IsRunning())
+        g_current_applet->Update();
+
+    CoreTiming::ScheduleEvent(usToCycles(applet_update_interval) - cycles_late,
+        applet_update_event);
+}
+
+void Init() {
+    applet_update_event = CoreTiming::RegisterEvent("HLE Applet Update Event", AppletUpdateEvent);
+    CoreTiming::ScheduleEvent(usToCycles(applet_update_interval), applet_update_event);
+}
+
+void Shutdown() {
+    CoreTiming::UnscheduleEvent(applet_update_event, 0);
+}
+
 }
 } // namespace
-- 
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