namespace AcDream.Content;

// MP1a follow-up (2026-07-05): Content-owned upload-format hint enums.
// AcDream.Content must stay Silk.NET-free (the MP1b bake tool must not ship
// GL binaries), so the moved MeshBatchData/TextureBatchData records carry
// these. The underlying values are the OpenGL ABI constants — a stable
// specification ABI that cannot drift between library versions — which is
// what let App's world-texture stack (WorldTextureArray.cs,
// TextureFormatExtensions.cs) adopt this same vocabulary directly at
// Campaign V slice V11, once Silk.NET.OpenGL.PixelFormat/PixelType were
// deleted along with the rest of the raw-GL arm. Before that slice, App held
// a separate Silk.NET-typed enum and cast across the boundary
// (`(Silk.NET.OpenGL.PixelFormat?)batch.UploadPixelFormat`); now it's the
// same type on both sides of AcDream.Content's assembly boundary.
//
// Members are ONLY the values a decode path actually assigns. Add new
// members with their GL constant if a future one needs them — never
// renumber.

/// <summary>
/// GL pixel-format upload hint computed at extraction time.
/// Numeric values = OpenGL <c>GL_*</c> constants (= Silk.NET.OpenGL.PixelFormat).
/// </summary>
public enum UploadPixelFormat {
    /// <summary>GL_RGBA.</summary>
    Rgba = 0x1908,

    /// <summary>
    /// GL_RGB. Added at Campaign V slice V11: <c>App</c>'s
    /// <c>TextureFormatExtensions.ToPixelFormat</c> needs the full expected-format
    /// vocabulary once it stopped returning <c>Silk.NET.OpenGL.PixelFormat</c>
    /// (the deleted GL backend's own enum), not just the values extraction emits.
    /// </summary>
    Rgb = 0x1907,

    /// <summary>GL_RED. See <see cref="Rgb"/>'s remark — same V11 motivation.</summary>
    Red = 0x1903,
}

/// <summary>
/// GL pixel-type upload hint computed at extraction time.
/// Numeric values = OpenGL <c>GL_*</c> constants (= Silk.NET.OpenGL.PixelType).
/// </summary>
public enum UploadPixelType {
    /// <summary>GL_UNSIGNED_BYTE.</summary>
    UnsignedByte = 0x1401,

    /// <summary>
    /// GL_FLOAT. Added at Campaign V slice V11 for the same reason as
    /// <see cref="UploadPixelFormat.Rgb"/>.
    /// </summary>
    Float = 0x1406,
}