50 lines
1.7 KiB
C#
50 lines
1.7 KiB
C#
using System.Reflection;
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using System.Runtime.InteropServices;
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using OpenTK.Graphics.OpenGL;
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namespace Engine.Renderer.Buffer.Vertex;
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public interface IVertex
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{
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public static IOrderedEnumerable<FieldInfo> GetFields<T>() => GetFields(typeof(T));
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public static IOrderedEnumerable<FieldInfo> GetFields(Type type) =>
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type.GetFields(BindingFlags.Public | BindingFlags.Instance).OrderBy(f => f.MetadataToken);
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public static bool IsValid(Type type)
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{
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if (!type.IsValueType || !type.IsAssignableTo(typeof(IVertex)))
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return false;
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var fields = GetFields(type);
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var totalSize = 0;
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foreach (var field in fields)
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{
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if (!field.FieldType.IsValueType)
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return false;
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var attribute = field.GetCustomAttribute<VertexAttribute>();
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if (attribute == null)
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return false;
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var size = AttributeSize(attribute.Type) * attribute.ComponentCount * attribute.RepeatCount;
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if (size != Marshal.SizeOf(field.FieldType))
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return false;
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totalSize += size;
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}
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return totalSize == Marshal.SizeOf(type);
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}
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public static int AttributeSize(VertexAttribType type) => type switch
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{
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VertexAttribType.Byte or VertexAttribType.UnsignedByte => sizeof(byte),
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VertexAttribType.Short or VertexAttribType.UnsignedShort => sizeof(short),
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VertexAttribType.Int or VertexAttribType.UnsignedInt => sizeof(int),
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VertexAttribType.HalfFloat => Marshal.SizeOf<Half>(),
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VertexAttribType.Float => sizeof(float),
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VertexAttribType.Double => sizeof(double),
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_ => 0
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};
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} |