/// <summary>
/// Initializes a new <see cref="VertexArrayObject"/> drawing triangles using <see cref="UInt16"/> indices.
/// </summary>
/// <param name="indexBuffer">The <see cref="IBuffer"/> containing the index data.</param>
/// <param name="buffers">The buffers containing the actual vertex data.</param>
public VertexArrayObject(IReadOnlyBuffer indexBuffer, params BufferDescription[] buffers)
: this(indexBuffer, BeginMode.Triangles, DrawElementsType.UnsignedShort, buffers)
{
Contract.Requires<ArgumentNullException>(buffers != null);
Contract.Requires<ArgumentNullException>(indexBuffer != null);
Contract.Requires<ArgumentException>(indexBuffer.Target == BufferTarget.ElementArrayBuffer);
}
/// <summary>
/// Initializes a new <see cref="BufferDescription"/> setting the buffer and the attribute pointers.
/// </summary>
/// <param name="vertexBuffer">The data buffer.</param>
/// <param name="vertexAttributePointers">
/// The <see cref="VertexAttributePointer"/>s describing the layout of the data in memory.
/// </param>
public BufferDescription(IReadOnlyBuffer vertexBuffer, params VertexAttributePointer[] vertexAttributePointers)
: this()
{
Contract.Requires<ArgumentNullException>(vertexAttributePointers != null);
this.Buffer = vertexBuffer;
this.VertexAttributePointers = vertexAttributePointers.FilterNull().ToImmutableArray();
}
/// <summary>
/// Initializes a new <see cref="VertexArrayObject"/>.
/// </summary>
/// <param name="indexBuffer">The <see cref="IBuffer"/> containing the index data.</param>
/// <param name="drawMode">The <see cref="BeginMode"/>.</param>
/// <param name="indexBufferType">The type of the indices.</param>
/// <param name="buffers">The buffers containing the actual vertex data.</param>
public VertexArrayObject(IReadOnlyBuffer indexBuffer, BeginMode drawMode, DrawElementsType indexBufferType, params BufferDescription[] buffers)
{
Contract.Requires<ArgumentNullException>(buffers != null);
Contract.Requires<ArgumentNullException>(indexBuffer != null);
Contract.Requires<ArgumentException>(indexBuffer.Target == BufferTarget.ElementArrayBuffer);
this.VerifyAccess();
this.DrawMode = drawMode;
this.IndexBuffer = indexBuffer;
this.IndexType = indexBufferType;
this.VertexBuffers = buffers.ToImmutableArray();
this.Handle = GL.GenVertexArray();
// Can't use Binding and using clause here because it causes a stack overflow (Bindable.Bind -> Initialize)
try
{
GL.BindVertexArray(this);
foreach (BufferDescription desc in this.VertexBuffers)
{
if (desc.Buffer != null)
{
using (Binding vboBinding = desc.Buffer.Bind())
{
foreach (VertexAttributePointer vertexPointer in desc.VertexAttributePointers.OrderBy(vap => vap.Index))
{
vertexPointer.Enable();
vertexPointer.Apply();
}
}
}
}
this.IndexBuffer.Bind();
}
finally
{
GL.BindVertexArray(0);
}
this.IndexBuffer.Unbind();
}
