/// <summary>
/// Virtual Unbind implementation.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding.
/// </param>
protected override void UnbindCore(GraphicsContext ctx)
{
if (ctx.Caps.GlExtensions.TransformFeedback2_ARB)
{
// Bind this feedback buffer
Gl.BindTransformFeedback(Gl.TRANSFORM_FEEDBACK, InvalidObjectName);
}
else
{
base.UnbindCore(ctx);
}
}
/// <summary>
/// Bind this BufferObject.
/// </summary>
internal override void Bind(GraphicsContext ctx)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
if (ctx.Caps.GlExtensions.TransformFeedback2_ARB)
{
// Bind this feedback buffer
Gl.BindTransformFeedback(Gl.TRANSFORM_FEEDBACK, ObjectName);
}
else
{
base.Bind(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.Caps.GlExtensions.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
{
Bind(ctx);
// Define feedback buffer
MapBufferObjects(ctx);
}
// Create queries
_PrimitivesGenerated = new QueryObject(QueryTarget.PrimitivesGenerated);
_PrimitivesGenerated.Create(ctx);
_PrimitivesWritten = new QueryObject(QueryTarget.TransformFeedbackPrimitivesGenerated);
_PrimitivesWritten.Create(ctx);
}
/// <summary>
/// Unbind this BufferObject.
/// </summary>
internal override void Unbind(GraphicsContext ctx)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
if (ctx.Caps.GlExtensions.TransformFeedback2_ARB)
{
// Bind this feedback buffer
Gl.BindTransformFeedback(Gl.TRANSFORM_FEEDBACK, 0);
}
#if false
else
{
// Manually map buffer objects
foreach (KeyValuePair <uint, ArrayAttachment> pair in mAttachedArrays)
{
Gl.BindBufferBase(Gl.TRANSFORM_FEEDBACK_BUFFER, pair.Key, 0);
RenderException.DebugCheckErrors();
}
}
#endif
}