/// <summary>
/// Applies a <see cref="PostShader"/> to the <see cref="OmegaEngine.Graphics.RenderTarget"/> and outputs the result to the back-buffer
/// </summary>
/// <param name="shader">The <see cref="PostShader"/> to apply</param>
/// <param name="alpha">The level of transparency from 0 (solid) to 255 (invisible)</param>
private void ShaderToBackBuffer(PostShader shader, int alpha)
{
Engine.State.AlphaBlend = alpha;
using (new ProfilerEvent(() => "Apply " + shader))
{
shader.Apply(delegate
{
Engine.Device.BeginScene();
Engine.DrawQuadShader();
Engine.Device.EndScene();
}, _area.Size, shader.OverlayRendering ? null : RenderTarget);
}
}
/// <summary>
/// Updates the <see cref="OmegaEngine.Graphics.RenderTarget"/> using a <see cref="PostShader"/>
/// </summary>
/// <param name="shader">The <see cref="PostShader"/> to apply</param>
protected void ShaderToRenderTarget(PostShader shader)
{
#region Sanity checks
if (shader == null)
{
throw new ArgumentNullException(nameof(shader));
}
#endregion
// Make sure input and output texture aren't the same
var sceneMap = RenderTarget;
if (!shader.OverlayRendering)
{
SwapRenderTarget();
}
// Apply the shader and move data from one texture to the other
using (new ProfilerEvent(() => "Apply " + shader))
shader.Apply(() => RenderTarget.RenderTo(Engine.DrawQuadShader), sceneMap.Size, shader.OverlayRendering ? null : sceneMap);
}