Sdl backend (#670)

* [audio] added sdl audio backend and in-tree atrac9 decoder

* [input] replaced per-platform pad readers with sdl gamepad input

* [video] added sdl window and host display plumbing

* [gui] added host display options and per-game render settings

* [bink] synced host movie playback to the guest audio clock

* [cpu] hooked windows write faults into guest image tracking

* [perf] added guest and render profiling, reserved host cpu lanes

* [kernel] fixed stale pthread mutex handle alias

* [host] wired the sdl session, save-data paths and project references

* [audio] hoisted ajm trace stackalloc out of its loop

* [video] Add guest image sync setting

* [build] Strip native symbols

* reuse

src/SharpEmu.Libs/VideoOut/HostVideoOptions.cs

@@ -0,0 +1,68 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+namespace SharpEmu.Libs.VideoOut;
+
+using SharpEmu.Libs.Gpu.Metal;
+
+public enum HostWindowMode
+{
+    Windowed,
+    Borderless,
+    ExclusiveFullscreen,
+}
+
+public enum HostScalingMode
+{
+    Fit,
+    Cover,
+    Stretch,
+    Integer,
+}
+
+public enum HostHdrMode
+{
+    Auto,
+    On,
+    Off,
+}
+
+public sealed record HostVideoOptions
+{
+    public static HostVideoOptions Default { get; } = new();
+
+    public HostWindowMode WindowMode { get; init; } = HostWindowMode.Windowed;
+
+    public HostScalingMode ScalingMode { get; init; } = HostScalingMode.Fit;
+
+    public int Width { get; init; } = 1920;
+
+    public int Height { get; init; } = 1080;
+
+    public int DisplayIndex { get; init; }
+
+    public int RefreshRate { get; init; }
+
+    public bool VSync { get; init; } = true;
+
+    public HostHdrMode HdrMode { get; init; } = HostHdrMode.Auto;
+
+    public HostVideoOptions Normalize() => this with
+    {
+        Width = Math.Clamp(Width, 640, 16384),
+        Height = Math.Clamp(Height, 360, 16384),
+        DisplayIndex = Math.Max(0, DisplayIndex),
+        RefreshRate = Math.Clamp(RefreshRate, 0, 1000),
+        HdrMode = Enum.IsDefined(HdrMode) ? HdrMode : HostHdrMode.Auto,
+    };
+}
+
+public static class HostVideoHost
+{
+    public static bool TryConfigureVideo(HostVideoOptions options)
+    {
+        var normalized = options.Normalize();
+        return VulkanVideoPresenter.TryConfigureVideo(normalized) &
+               MetalVideoPresenter.TryConfigureVideo(normalized);
+    }
+}