private void ApplyStateCore(GraphicsContext ctx, ShaderProgram program, PixelAlignmentState currentState)
{
if (currentState.PackAlignment != PackAlignment)
{
Gl.PixelStore(PixelStoreParameter.PackAlignment, PackAlignment);
}
if (currentState.UnpackAlignment != UnpackAlignment)
{
Gl.PixelStore(PixelStoreParameter.UnpackAlignment, UnpackAlignment);
}
}
/// <summary>
/// Merge this state with another one.
/// </summary>
/// <param name="state">
/// A <see cref="IGraphicsState"/> having the same <see cref="StateIdentifier"/> of this state.
/// </param>
public override void Merge(IGraphicsState state)
{
if (state == null)
{
throw new ArgumentNullException("state");
}
PixelAlignmentState otherState = state as PixelAlignmentState;
if (otherState == null)
{
throw new ArgumentException("not a PixelAlignmentState", "state");
}
PackAlignment = otherState.PackAlignment;
UnpackAlignment = otherState.UnpackAlignment;
}
/// <summary>
/// Apply this depth test render state.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> which has defined the shader program <paramref name="program"/>.
/// </param>
/// <param name="program">
/// The <see cref="ShaderProgram"/> which has the state set.
/// </param>
public override void Apply(GraphicsContext ctx, ShaderProgram program)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
PixelAlignmentState currentState = (PixelAlignmentState)ctx.GetCurrentState(StateIndex);
if (currentState != null)
{
ApplyStateCore(ctx, program, currentState);
}
else
{
ApplyStateCore(ctx, program);
}
ctx.SetCurrentState(this);
}
/// <summary>
/// Indicates whether the current object is equal to another object of the same type.
/// </summary>
/// <param name="other">
/// A <see cref="GraphicsState"/> to compare to this GraphicsState.
/// </param>
/// <returns>
/// It returns true if the current object is equal to <paramref name="other"/>.
/// </returns>
/// <remarks>
/// <para>
/// This method test only whether <paramref name="other"/> type equals to this type.
/// </para>
/// </remarks>
/// <exception cref="ArgumentNullException">
/// This exception is thrown if the parameter <paramref name="other"/> is null.
/// </exception>
public override bool Equals(IGraphicsState other)
{
if (base.Equals(other) == false)
{
return(false);
}
Debug.Assert(other is PixelAlignmentState);
PixelAlignmentState otherState = (PixelAlignmentState)other;
if (otherState.PackAlignment != PackAlignment)
{
return(false);
}
if (otherState.UnpackAlignment != UnpackAlignment)
{
return(false);
}
return(true);
}