RyuKen/Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs

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using Ryujinx.Graphics.GAL;
namespace Ryujinx.Graphics.Gpu.Image
{
/// <summary>
/// Texture format compatibility checks.
/// </summary>
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static class TextureCompatibility
{
private enum FormatClass
{
Unclassified,
BCn64,
BCn128,
Bc1Rgb,
Bc1Rgba,
Bc2,
Bc3,
Bc4,
Bc5,
Bc6,
Bc7
}
/// <summary>
/// Checks if two formats are compatible, according to the host API copy format compatibility rules.
/// </summary>
/// <param name="lhs">First comparand</param>
/// <param name="rhs">Second comparand</param>
/// <returns>True if the formats are compatible, false otherwise</returns>
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public static bool FormatCompatible(FormatInfo lhs, FormatInfo rhs)
{
if (IsDsFormat(lhs.Format) || IsDsFormat(rhs.Format))
{
return lhs.Format == rhs.Format;
}
if (lhs.Format.IsAstc() || rhs.Format.IsAstc())
{
return lhs.Format == rhs.Format;
}
if (lhs.IsCompressed && rhs.IsCompressed)
{
FormatClass lhsClass = GetFormatClass(lhs.Format);
FormatClass rhsClass = GetFormatClass(rhs.Format);
return lhsClass == rhsClass;
}
else
{
return lhs.BytesPerPixel == rhs.BytesPerPixel;
}
}
/// <summary>
/// Gets the texture format class, for compressed textures, or Unclassified otherwise.
/// </summary>
/// <param name="format">The format</param>
/// <returns>Format class</returns>
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private static FormatClass GetFormatClass(Format format)
{
switch (format)
{
case Format.Bc1RgbSrgb:
case Format.Bc1RgbUnorm:
return FormatClass.Bc1Rgb;
case Format.Bc1RgbaSrgb:
case Format.Bc1RgbaUnorm:
return FormatClass.Bc1Rgba;
case Format.Bc2Srgb:
case Format.Bc2Unorm:
return FormatClass.Bc2;
case Format.Bc3Srgb:
case Format.Bc3Unorm:
return FormatClass.Bc3;
case Format.Bc4Snorm:
case Format.Bc4Unorm:
return FormatClass.Bc4;
case Format.Bc5Snorm:
case Format.Bc5Unorm:
return FormatClass.Bc5;
case Format.Bc6HSfloat:
case Format.Bc6HUfloat:
return FormatClass.Bc6;
case Format.Bc7Srgb:
case Format.Bc7Unorm:
return FormatClass.Bc7;
}
return FormatClass.Unclassified;
}
/// <summary>
/// Checks if the format is a depth-stencil texture format.
/// </summary>
/// <param name="format">Format to check</param>
/// <returns>True if the format is a depth-stencil format (including depth only), false otherwise</returns>
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private static bool IsDsFormat(Format format)
{
switch (format)
{
case Format.D16Unorm:
case Format.D24X8Unorm:
case Format.D24UnormS8Uint:
case Format.D32Float:
case Format.D32FloatS8Uint:
case Format.S8Uint:
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return true;
}
return false;
}
}
}