protected override void DrawCore(RenderContext context)
{
// Update the weight array if necessary
if (weightsDirty || tapCount == 0)
{
weightsDirty = false;
Vector2[] gaussianWeights = GaussianUtil.Calculate1D((int)Radius, 2f, true);
tapCount = gaussianWeights.Length;
tapWeights = new float[tapCount];
for (int i = 0; i < tapCount; i++)
{
tapWeights[i] = gaussianWeights[i].Y;
}
}
var originalTexture = GetSafeInput(0);
var outputTexture = GetSafeOutput(0);
var tapNumber = 2 * tapCount - 1;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurKeys.Count, tapCount);
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurKeys.TotalTap, tapNumber);
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Radius, Radius);
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.TapWeights, tapWeights);
// Blur in one direction
var blurAngle = 0f;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var firstBlurTexture = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, originalTexture);
directionalBlurEffect.SetOutput(firstBlurTexture);
directionalBlurEffect.Draw(context, "GaussianBokehPass1_tap{0}_radius{1}", tapNumber, (int)Radius);
// Second blur pass to ouput the final result
blurAngle = MathUtil.PiOverTwo;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
directionalBlurEffect.SetInput(0, firstBlurTexture);
directionalBlurEffect.SetOutput(outputTexture);
directionalBlurEffect.Draw(context, "GaussianBokehPass2_tap{0}_radius{1}", tapNumber, (int)Radius);
}
protected override void DrawCore(RenderContext context)
{
// Input texture
var inputTexture = GetSafeInput(0);
// Get a temporary texture for the intermediate pass
// This texture will be allocated only in the scope of this draw and returned to the pool at the exit of this method
var desc = inputTexture.Description;
desc.MultiSampleLevel = MSAALevel.None; // TODO we should have a method to get a non-MSAA RT
var outputTextureH = NewScopedRenderTarget2D(desc);
var size = Radius * 2 + 1;
if (offsetsWeights == null)
{
nameGaussianBlurH = string.Format("GaussianBlurH{0}x{0}", size);
nameGaussianBlurV = string.Format("GaussianBlurV{0}x{0}", size);
// TODO: cache if necessary
offsetsWeights = GaussianUtil.Calculate1D(Radius, SigmaRatio);
}
// Update shared parameters
Parameters.Set(GaussianBlurKeys.Count, offsetsWeights.Length);
Parameters.Set(GaussianBlurShaderKeys.OffsetsWeights, offsetsWeights);
// Horizontal pass
blurH.SetInput(inputTexture);
blurH.SetOutput(outputTextureH);
blurH.Draw(context, nameGaussianBlurH);
// Vertical pass
blurV.SetInput(outputTextureH);
blurV.SetOutput(GetSafeOutput(0));
blurV.Draw(context, nameGaussianBlurV);
}
