public void Draw(RenderDrawContext context, float sigmaRatio, Texture inputTexture, Texture outputTexture)
{
// Check if we need to regenerate offsetsWeights
if (offsetsWeights == null || this.sigmaRatio != sigmaRatio)
{
offsetsWeights = GaussianUtil.Calculate1D(Radius, sigmaRatio);
// Update parameters
blurH.Parameters.Set(GaussianBlurShaderKeys.OffsetsWeights, offsetsWeights);
blurV.Parameters.Set(GaussianBlurShaderKeys.OffsetsWeights, offsetsWeights);
this.sigmaRatio = sigmaRatio;
}
// 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.MultisampleCount = MultisampleCount.None; // TODO we should have a method to get a non-multisampled RT
var outputTextureH = gaussianBlur.NewScopedRenderTarget2D(desc);
// Horizontal pass
blurH.SetInput(inputTexture);
blurH.SetOutput(outputTextureH);
blurH.Draw(context, nameGaussianBlurH);
// Vertical pass
blurV.SetInput(outputTextureH);
blurV.SetOutput(outputTexture);
blurV.Draw(context, nameGaussianBlurV);
}
public GaussianBlurShader(GaussianBlur gaussianBlur, int radius)
{
Radius = radius;
this.gaussianBlur = gaussianBlur;
// Craete ImageEffectShader
blurH = gaussianBlur.ToLoadAndUnload(new ImageEffectShader("GaussianBlurEffect", true));
blurV = gaussianBlur.ToLoadAndUnload(new ImageEffectShader("GaussianBlurEffect", true));
blurH.Initialize(gaussianBlur.Context);
blurV.Initialize(gaussianBlur.Context);
// Setup Horizontal parameters
blurH.Parameters.Set(GaussianBlurKeys.VerticalBlur, false);
blurV.Parameters.Set(GaussianBlurKeys.VerticalBlur, true);
var size = radius * 2 + 1;
nameGaussianBlurH = string.Format("GaussianBlurH{0}x{0}", size);
nameGaussianBlurV = string.Format("GaussianBlurV{0}x{0}", size);
// TODO: cache if necessary
offsetsWeights = GaussianUtil.Calculate1D(this.Radius, gaussianBlur.SigmaRatio);
// Update permutation parameters
blurH.Parameters.Set(GaussianBlurKeys.Count, offsetsWeights.Length);
blurV.Parameters.Set(GaussianBlurKeys.Count, offsetsWeights.Length);
blurH.EffectInstance.UpdateEffect(gaussianBlur.Context.GraphicsDevice);
blurV.EffectInstance.UpdateEffect(gaussianBlur.Context.GraphicsDevice);
// Update parameters
blurH.Parameters.Set(GaussianBlurShaderKeys.OffsetsWeights, offsetsWeights);
blurV.Parameters.Set(GaussianBlurShaderKeys.OffsetsWeights, offsetsWeights);
}
protected override void DrawCore(RenderDrawContext 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.EffectInstance.UpdateEffect(context.GraphicsDevice);
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);
}