/// <summary>
/// Draws this <see cref="DrawNode"/> to the screen.
/// </summary>
/// <remarks>
/// Subclasses must invoke <code>base.Draw()</code> prior to drawing vertices.
/// </remarks>
/// <param name="vertexAction">The action to be performed on each vertex of the draw node in order to draw it if required. This is primarily used by textured sprites.</param>
public virtual void Draw(Action <TexturedVertex2D> vertexAction)
{
GLWrapper.SetBlend(DrawColourInfo.Blending);
// This is the back-to-front (BTF) pass. The back-buffer depth test function used is GL_LESS.
// The depth test will fail for samples that overlap the opaque interior of this <see cref="DrawNode"/> and any <see cref="DrawNode"/>s above this one.
GLWrapper.SetDrawDepth(drawDepth);
}
/// <summary>
/// Draws the opaque interior of this <see cref="DrawNode"/> to the screen.
/// The opaque interior must be a fully-opaque, non-blended area of this <see cref="DrawNode"/>, clipped to the current masking area via <code>DrawClipped()</code>.
/// See <see cref="Shapes.Box.BoxDrawNode"/> for an example implementation.
/// </summary>
/// <remarks>
/// Subclasses must invoke <code>base.DrawOpaqueInterior()</code> prior to drawing vertices.
/// </remarks>
/// <param name="vertexAction">The action to be performed on each vertex of the draw node in order to draw it if required. This is primarily used by textured sprites.</param>
protected virtual void DrawOpaqueInterior(Action <TexturedVertex2D> vertexAction)
{
GLWrapper.SetBlend(DrawColourInfo.Blending);
GLWrapper.SetDrawDepth(drawDepth);
}
/// <summary>
/// Draws the opaque interior of this <see cref="DrawNode"/> to the screen.
/// The opaque interior must be a fully-opaque, non-blended area of this <see cref="DrawNode"/>, clipped to the current masking area via <code>DrawClipped()</code>.
/// See <see cref="Sprites.SpriteDrawNode"/> for an example implementation.
/// </summary>
/// <remarks>
/// Subclasses must invoke <code>base.DrawOpaqueInterior()</code> prior to drawing vertices.
/// </remarks>
/// <param name="vertexAction">The action to be performed on each vertex of the draw node in order to draw it if required. This is primarily used by textured sprites.</param>
protected virtual void DrawOpaqueInterior(Action <TexturedVertex2D> vertexAction)
{
GLWrapper.SetDrawDepth(drawDepth);
}
