public Image(VeldridDrawspace dspace, Rect2D subRect)
{
BufferDescription ibDescription = new BufferDescription(
4 * sizeof(ushort),
BufferUsage.IndexBuffer);
Indices = dspace.Factory.CreateBuffer(ibDescription);
var vertices = new VertexPositionTexture[]
{
// Top
new VertexPositionTexture(new Vector3(-0.5f, +0.5f, -0.5f), new Vector2(0, 0)),
new VertexPositionTexture(new Vector3(+0.5f, +0.5f, -0.5f), new Vector2(1, 0)),
new VertexPositionTexture(new Vector3(+0.5f, +0.5f, +0.5f), new Vector2(1, 1)),
new VertexPositionTexture(new Vector3(-0.5f, +0.5f, +0.5f), new Vector2(0, 1)),
};
BufferDescription vbDescription = new BufferDescription(
4 * VertexPositionTexture.SizeInBytes,
BufferUsage.VertexBuffer);
Vertices = dspace.Factory.CreateBuffer(vbDescription);
dspace.GraphicsDevice.UpdateBuffer(Vertices, 0, vertices);
ushort[] quadIndices = { 0, 1, 2, 3 };
dspace.GraphicsDevice.UpdateBuffer(Indices, 0, quadIndices);
}
public void Draw(VeldridDrawspace dspace, IMatrix2D matrix)
{
dspace.CommandList.SetVertexBuffer(0, Vertices);
dspace.CommandList.SetIndexBuffer(Indices, IndexFormat.UInt16);
dspace.CommandList.SetPipeline(dspace.Pipeline);
// Issue a Draw command for a single instance with 4 indices.
dspace.CommandList.DrawIndexed(
indexCount: 4,
instanceCount: 1,
indexStart: 0,
vertexOffset: 0,
instanceStart: 0);
}