private static Buffer CreateVertexBuffer()
{
// ReSharper disable once RedundantCast
var vertices = (Span <Vertex>) stackalloc Vertex[3];
// describe the vertices of the triangle
vertices[0].Position = new Vector3(0.0f, 0.5f, 0.5f);
vertices[0].Color = Rgba32F.Red;
vertices[1].Position = new Vector3(0.5f, -0.5f, 0.5f);
vertices[1].Color = Rgba32F.Green;
vertices[2].Position = new Vector3(-0.5f, -0.5f, 0.5f);
vertices[2].Color = Rgba32F.Blue;
// describe an immutable vertex buffer
var bufferDesc = new BufferDescriptor
{
Usage = ResourceUsage.Immutable,
Type = BufferType.VertexBuffer
};
// immutable buffers need to specify the data/size in the descriptor
// when using a `Memory<T>`, or a `Span<T>` which is unmanaged or already pinned, we do this by calling `SetData`
bufferDesc.SetData(vertices);
// create the vertex buffer resource from the descriptor
// note: for immutable buffers, this "uploads" the data to the GPU
return(GraphicsDevice.CreateBuffer(ref bufferDesc));
}
private static Buffer CreateIndexBuffer()
{
// ReSharper disable once RedundantCast
var indices = (Span <ushort>) stackalloc ushort[]
{
0, 1, 2, // triangle
0, 1, 2, // triangle 1 of quad
0, 2, 3 // triangle 2 of quad
};
// describe an immutable index buffer
var bufferDesc = new BufferDescriptor
{
Usage = ResourceUsage.Immutable,
Type = BufferType.IndexBuffer
};
// immutable buffers need to specify the data/size in the descriptor
// when using a `Memory<T>`, or a `Span<T>` which is unmanaged or already pinned, we do this by calling `SetData`
bufferDesc.SetData(indices);
// create the index buffer resource using the descriptor
// note: for immutable buffers, this "uploads" the data to the GPU
return(GraphicsDevice.CreateBuffer(ref bufferDesc));
}
