Set up mpv render API initialization

src/simulacrum-dalamud-av/MpvRender.cs

@@ -23,11 +23,4 @@ public static partial class MpvRender
     internal static partial void FreeContext(nint context);
 
     public delegate void MpvRenderUpdateCallback(nint ctx);
-
-    [StructLayout(LayoutKind.Sequential)]
-    public struct MpvRenderParam
-    {
-        public int Type;
-        public nint Data;
-    }
 }

src/simulacrum-dalamud-av/MpvRenderContext.cs

@@ -1,13 +1,23 @@
-namespace Simulacrum.AV;
+using System.Runtime.CompilerServices;
+
+namespace Simulacrum.AV;
 
 public class MpvRenderContext : IDisposable
 {
     private nint _context;
 
-    public MpvRenderContext(MpvHandle handle)
+    public unsafe MpvRenderContext(MpvHandle handle)
     {
-        var result = MpvRender.CreateContext(_context, handle._handle, ReadOnlySpan<MpvRender.MpvRenderParam>.Empty);
-        MpvException.ThrowMpvError(result);
+        Span<MpvRenderParam> contextParams = stackalloc MpvRenderParam[2];
+
+        var apiType = "sw"u8.ToArray().AsSpan();
+        fixed (byte* apiTypePtr = apiType)
+        {
+            contextParams[0] = new MpvRenderParam { Type = MpvRenderParamType.ApiType, Data = (nint)apiTypePtr };
+
+            var result = MpvRender.CreateContext(_context, handle._handle, contextParams);
+            MpvException.ThrowMpvError(result);
+        }
     }
 
     private void ReleaseUnmanagedResources()

src/simulacrum-dalamud-av/MpvRenderParam.cs

@@ -0,0 +1,10 @@
+using System.Runtime.InteropServices;
+
+namespace Simulacrum.AV;
+
+[StructLayout(LayoutKind.Sequential)]
+public struct MpvRenderParam
+{
+    public MpvRenderParamType Type;
+    public nint Data;
+}

src/simulacrum-dalamud-av/MpvRenderParamType.cs

@@ -0,0 +1,27 @@
+namespace Simulacrum.AV;
+
+// https://github.com/mpv-player/mpv/blob/665a47209869d7a0c4ea860b28910fcd6ca874c8/libmpv/render.h#L171
+public enum MpvRenderParamType
+{
+    Invalid,
+    ApiType,
+    OpenGLInitParams,
+    OpenGLFrameBufferObject,
+    FlipY,
+    Depth,
+    IccProfile,
+    AmbientLight,
+    X11Display,
+    WaylandDisplay,
+    AdvancedControl,
+    NextFrameInfo,
+    BlockForTargetTime,
+    SkipRendering,
+    DrmDisplay,
+    DrmDrawSurfaceSize,
+    DrmDisplayV2,
+    SoftwareSize,
+    SoftwareFormat,
+    SoftwareStride,
+    SoftwarePointer,
+}