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Add Triangles to MeshAccessor for easy index buffer access

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#3918
This commit is contained in:
Wojtek Figat
2026-02-05 13:00:49 +01:00
parent f57df83d26
commit 65fd22f5b6
1 changed files with 92 additions and 6 deletions
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98
Source/Engine/Graphics/Models/MeshAccessor.cs
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@@ -265,6 +265,39 @@ namespace FlaxEngine
}
}
/// <summary>
/// Copies the contents of the input <see cref="T:System.Span`1"/> into the elements of this stream.
/// </summary>
/// <param name="src">The source <see cref="T:System.Span`1"/>.</param>
public void Set(Span<uint> src)
{
if (IsLinear(PixelFormat.R32_UInt))
{
src.CopyTo(MemoryMarshal.Cast<byte, uint>(_data));
}
else if (IsLinear(PixelFormat.R16_UInt))
{
var count = Count;
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
((ushort*)data)[i] = (ushort)src[i];
}
}
else
{
var count = Count;
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
{
var v = new Float4(src[i]);
_sampler.Write(data + i * _stride, ref v);
}
}
}
}
/// <summary>
/// Copies the contents of this stream into a destination <see cref="T:System.Span`1" />.
/// </summary>
@@ -281,9 +314,7 @@ namespace FlaxEngine
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
{
dst[i] = new Float2(_sampler.Read(data + i * _stride));
}
}
}
}
@@ -304,9 +335,7 @@ namespace FlaxEngine
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
{
dst[i] = new Float3(_sampler.Read(data + i * _stride));
}
}
}
}
@@ -327,9 +356,37 @@ namespace FlaxEngine
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
{
dst[i] = (Color)_sampler.Read(data + i * _stride);
}
}
}
}
/// <summary>
/// Copies the contents of this stream into a destination <see cref="T:System.Span`1" />.
/// </summary>
/// <param name="dst">The destination <see cref="T:System.Span`1" />.</param>
public void CopyTo(Span<uint> dst)
{
if (IsLinear(PixelFormat.R32_UInt))
{
_data.CopyTo(MemoryMarshal.Cast<uint, byte>(dst));
}
else if (IsLinear(PixelFormat.R16_UInt))
{
var count = Count;
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
dst[i] = ((ushort*)data)[i];
}
}
else
{
var count = Count;
fixed (byte* data = _data)
{
for (int i = 0; i < count; i++)
dst[i] = (uint)_sampler.Read(data + i * _stride).X;
}
}
}
@@ -619,6 +676,16 @@ namespace FlaxEngine
return Attribute((VertexElement.Types)((byte)VertexElement.Types.TexCoord0 + channel));
}
/// <summary>
/// Gets or sets the index buffer with triangle indices.
/// </summary>
/// <remarks>Uses <see cref="Index"/> stream to read or write data to the index buffer.</remarks>
public uint[] Triangles
{
get => GetStreamUInt(Index());
set => SetStreamUInt(Index(), value);
}
/// <summary>
/// Gets or sets the vertex positions. Null if <see cref="VertexElement.Types.Position"/> does not exist in vertex buffers of the mesh.
/// </summary>
@@ -659,6 +726,25 @@ namespace FlaxEngine
set => SetStreamFloat2(VertexElement.Types.TexCoord, value);
}
private uint[] GetStreamUInt(Stream stream)
{
uint[] result = null;
if (stream.IsValid)
{
result = new uint[stream.Count];
stream.CopyTo(result);
}
return result;
}
private void SetStreamUInt(Stream stream, uint[] value)
{
if (stream.IsValid)
{
stream.Set(value);
}
}
private delegate void TransformDelegate3(ref Float3 value);
private Float3[] GetStreamFloat3(VertexElement.Types attribute, TransformDelegate3 transform = null)