/// <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 CullFaceState);
CullFaceState otherState = (CullFaceState)other;
if (otherState._FrontFaceMode != _FrontFaceMode)
{
return(false);
}
if (otherState._Enabled != _Enabled)
{
return(false);
}
if (otherState._CulledFace != _CulledFace)
{
return(false);
}
return(true);
}
/// <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");
}
CullFaceState otherState = state as CullFaceState;
if (otherState == null)
{
throw new ArgumentException("not a CullFaceState", "state");
}
_FrontFaceMode = otherState._FrontFaceMode;
_Enabled = otherState._Enabled;
_CulledFace = otherState._CulledFace;
}
/// <summary>
/// Set ShaderProgram 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");
}
CullFaceState currentState = (CullFaceState)ctx.GetCurrentState(StateIndex);
if (currentState != null)
{
ApplyStateCore(ctx, program, currentState);
}
else
{
ApplyStateCore(ctx, program);
}
ctx.SetCurrentState(this);
}
private void ApplyStateCore(GraphicsContext ctx, ShaderProgram program, CullFaceState currentState)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
// Front face determination
if (currentState.FrontFaceMode != FrontFaceMode)
{
Gl.FrontFace(FrontFaceMode);
}
// Culling
if (_Enabled)
{
// Face culling
if (currentState._Enabled == false)
{
Gl.Enable(EnableCap.CullFace);
}
// Culled face
if (currentState.CulledFace != CulledFace)
{
Gl.CullFace(CulledFace);
}
}
else
{
//No face culling
if (currentState._Enabled == true)
{
Gl.Disable(EnableCap.CullFace);
}
}
}