public static SceneMesh CreateMesh(Assimp.Mesh resource)
{
var mesh = new SceneMesh();
mesh.MaterialIndex = resource.MaterialIndex;
var vertices = GetVertices(resource, out int stride, out VertexBounds bounds);
mesh.Bounds = new Bounds(bounds.Center, bounds.Extents);
mesh.VertexCount = resource.VertexCount;
mesh.DrawMode = PrimitiveType.Triangles;
GL.BindVertexArray(mesh.VertexArray);
GL.BindBuffer(BufferTarget.ArrayBuffer, mesh.VertexBuffer);
GL.BufferData(BufferTarget.ArrayBuffer,
new IntPtr(vertices.Length * BlittableValueType <float> .Stride),
vertices, BufferUsageHint.StaticDraw);
if (resource.HasFaces)
{
mesh.EnsureElementArray();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, mesh.ElementArray);
if (resource.VertexCount <= short.MaxValue)
{
var indices = resource.GetShortIndices();
mesh.VertexCount = indices.Length;
mesh.ElementArrayType = DrawElementsType.UnsignedShort;
GL.BufferData(BufferTarget.ElementArrayBuffer,
new IntPtr(indices.Length * BlittableValueType <short> .Stride),
indices, BufferUsageHint.StaticDraw);
}
else
{
var indices = resource.GetIndices();
mesh.VertexCount = indices.Length;
mesh.ElementArrayType = DrawElementsType.UnsignedInt;
GL.BufferData(BufferTarget.ElementArrayBuffer,
new IntPtr(indices.Length * BlittableValueType <int> .Stride),
indices, BufferUsageHint.StaticDraw);
}
}
var attrib = 0;
var offset = 0;
if (resource.HasVertices)
{
offset = PushAttribArray(attrib++, ElementSizeVector3D, stride, offset);
}
for (int k = 0; k < resource.TextureCoordinateChannelCount; k++)
{
offset = PushAttribArray(attrib++, resource.UVComponentCount[k], stride, offset);
}
for (int c = 0; c < resource.VertexColorChannelCount; c++)
{
offset = PushAttribArray(attrib++, ElementSizeColor4D, stride, offset);
}
if (resource.HasNormals)
{
PushAttribArray(attrib++, ElementSizeVector3D, stride, offset);
}
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindVertexArray(0);
return(mesh);
}
