/// <summary>
/// Virtual Unbind implementation.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding.
/// </param>
protected override void UnbindCore(GraphicsContext ctx)
{
if (ctx.Extensions.TransformFeedback2_ARB)
{
// Bind this feedback buffer
Gl.BindTransformFeedback(Gl.TRANSFORM_FEEDBACK, InvalidObjectName);
}
else
{
base.UnbindCore(ctx);
}
}
/// <summary>
/// Virtual Bind implementation.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding.
/// </param>
protected override void BindCore(GraphicsContext ctx)
{
if (ctx.Extensions.TransformFeedback2_ARB)
{
// Bind this feedback buffer
Gl.BindTransformFeedback(TransformFeedbackTarget.TransformFeedback, ObjectName);
}
else
{
base.BindCore(ctx);
MapBufferObjects(ctx);
}
}
/// <summary>
/// Actually create this GraphicsResource resources.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
protected override void CreateObject(GraphicsContext ctx)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
if (_AttachedArrays.Count == 0)
{
throw new InvalidOperationException("no feedback attachments");
}
if (ctx.Extensions.TransformFeedback2_ARB)
{
// Bind/create feedback buffer
Gl.BindTransformFeedback(Gl.TRANSFORM_FEEDBACK, ObjectName);
// Define feedback buffer
MapBufferObjects(ctx);
// Reset feedback target binding
Gl.BindTransformFeedback(Gl.TRANSFORM_FEEDBACK, 0);
}
else
{
ctx.Bind(this);
// Define feedback buffer
MapBufferObjects(ctx);
}
// Create queries
_PrimitivesGenerated = new QueryObject(QueryTarget.PrimitivesGenerated);
_PrimitivesGenerated.Create(ctx);
_PrimitivesWritten = new QueryObject(QueryTarget.TransformFeedbackPrimitivesGenerated);
_PrimitivesWritten.Create(ctx);
}
