From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 contrib/SDL-3.2.8/src/power/n3ds/SDL_syspower.c | 104 ++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/power/n3ds/SDL_syspower.c

(limited to 'contrib/SDL-3.2.8/src/power/n3ds')

diff --git a/contrib/SDL-3.2.8/src/power/n3ds/SDL_syspower.c b/contrib/SDL-3.2.8/src/power/n3ds/SDL_syspower.c
new file mode 100644
index 0000000..822398a
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/power/n3ds/SDL_syspower.c
@@ -0,0 +1,104 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_internal.h"
+
+#if !defined(SDL_POWER_DISABLED) && defined(SDL_POWER_N3DS)
+
+#include <3ds.h>
+
+static SDL_PowerState GetPowerState(void);
+static bool ReadStateFromPTMU(bool *is_plugged, u8 *is_charging);
+static int GetBatteryPercentage(void);
+
+#define BATTERY_PERCENT_REG      0xB
+#define BATTERY_PERCENT_REG_SIZE 2
+
+bool SDL_GetPowerInfo_N3DS(SDL_PowerState *state, int *seconds, int *percent)
+{
+    *state = GetPowerState();
+    *percent = GetBatteryPercentage();
+    *seconds = -1; // libctru doesn't provide a way to estimate battery life
+
+    return true;
+}
+
+static SDL_PowerState GetPowerState(void)
+{
+    bool is_plugged;
+    u8 is_charging;
+
+    if (!ReadStateFromPTMU(&is_plugged, &is_charging)) {
+        return SDL_POWERSTATE_UNKNOWN;
+    }
+
+    if (is_charging) {
+        return SDL_POWERSTATE_CHARGING;
+    }
+
+    if (is_plugged) {
+        return SDL_POWERSTATE_CHARGED;
+    }
+
+    return SDL_POWERSTATE_ON_BATTERY;
+}
+
+static bool ReadStateFromPTMU(bool *is_plugged, u8 *is_charging)
+{
+    if (R_FAILED(ptmuInit())) {
+        return SDL_SetError("Failed to initialise PTMU service");
+    }
+
+    if (R_FAILED(PTMU_GetAdapterState(is_plugged))) {
+        ptmuExit();
+        return SDL_SetError("Failed to read adapter state");
+    }
+
+    if (R_FAILED(PTMU_GetBatteryChargeState(is_charging))) {
+        ptmuExit();
+        return SDL_SetError("Failed to read battery charge state");
+    }
+
+    ptmuExit();
+    return true;
+}
+
+static int GetBatteryPercentage(void)
+{
+    u8 data[BATTERY_PERCENT_REG_SIZE];
+
+    if (R_FAILED(mcuHwcInit())) {
+        SDL_SetError("Failed to initialise mcuHwc service");
+        return -1;
+    }
+
+    if (R_FAILED(MCUHWC_ReadRegister(BATTERY_PERCENT_REG, data, BATTERY_PERCENT_REG_SIZE))) {
+        mcuHwcExit();
+        SDL_SetError("Failed to read battery register");
+        return -1;
+    }
+
+    mcuHwcExit();
+
+    return (int)SDL_round(data[0] + data[1] / 256.0);
+}
+
+#endif // !SDL_POWER_DISABLED && SDL_POWER_N3DS
-- 
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