// Naive approach: 4 passes. (Reference version)
private void DrawCoreNaive(RenderContext context)
{
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 = Phase;
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, "McIntoshBokehPass1_tap{0}_radius{1}", tapNumber, (int)Radius);
// Diagonal blur A
blurAngle = MathUtil.Pi / 3f + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var diagonalBlurA = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, firstBlurTexture);
directionalBlurEffect.SetOutput(diagonalBlurA);
directionalBlurEffect.Draw(context, "McIntoshBokehPass2A_tap{0}_radius{1}", tapNumber, (int)Radius);
// Diagonal blur B
blurAngle = -MathUtil.Pi / 3f + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var diagonalBlurB = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, firstBlurTexture);
directionalBlurEffect.SetOutput(diagonalBlurB);
directionalBlurEffect.Draw(context, "McIntoshBokehPass2B_tap{0}_radius{1}", tapNumber, (int)Radius);
// Final pass outputting the min of A and B
finalCombineEffect.SetInput(0, diagonalBlurA);
finalCombineEffect.SetInput(1, diagonalBlurB);
finalCombineEffect.SetOutput(outputTexture);
finalCombineEffect.Draw(context, name: "McIntoshBokehPassCombine");
}
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);
}
// Optimized approach: 2 passes.
private void DrawCoreOptimized(RenderContext context)
{
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 = Phase;
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, "McIntoshBokehPass1_tap{0}_radius{1}", tapNumber, (int)Radius);
// Calculates the 2 diagonal blurs and keep the min of them
var diagonalBlurAngleA = MathUtil.Pi / 3f + Phase;
var diagonalBlurAngleB = -MathUtil.Pi / 3f + Phase;
optimizedEffect.SetInput(0, firstBlurTexture);
optimizedEffect.SetOutput(outputTexture);
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurKeys.Count, tapCount);
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurKeys.TotalTap, tapNumber);
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Radius.ComposeWith("directionalBlurA"), Radius);
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction.ComposeWith("directionalBlurA"), new Vector2((float)Math.Cos(diagonalBlurAngleA), (float)Math.Sin(diagonalBlurAngleA)));
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.TapWeights.ComposeWith("directionalBlurA"), tapWeights);
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Radius.ComposeWith("directionalBlurB"), Radius);
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction.ComposeWith("directionalBlurB"), new Vector2((float)Math.Cos(diagonalBlurAngleB), (float)Math.Sin(diagonalBlurAngleB)));
optimizedEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.TapWeights.ComposeWith("directionalBlurB"), tapWeights);
optimizedEffect.Draw(context, "McIntoshBokehPass2_BlurABCombine_tap{0}_radius{1}", tapNumber, (int)Radius);
}
// Naive approach: 6 passes
protected void DrawCoreNaive(RenderContext context)
{
var originalTexture = GetSafeInput(0);
var outputTexture = GetSafeOutput(0);
if (rhombiTapOffsetsDirty)
{
calculateRhombiOffsets();
}
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);
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.CoCReference, CoCStrength);
// Vertical blur
var blurAngle = MathUtil.PiOverTwo + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var verticalBlurTexture = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, originalTexture);
directionalBlurEffect.SetOutput(verticalBlurTexture);
directionalBlurEffect.Draw(context, "TripleRhombiBokeh_RhombiABVertical_tap{0}_radius{1}", tapNumber, (int)Radius);
// Rhombi A (top left)
blurAngle = 7f * MathUtil.Pi / 6f + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var rhombiA = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, verticalBlurTexture);
directionalBlurEffect.SetOutput(rhombiA);
directionalBlurEffect.Draw(context, "TripleRhombiBokeh_RhombiA_tap{0}_radius{1}", tapNumber, (int)Radius);
// Rhombi B (top right)
blurAngle = -MathUtil.Pi / 6f + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var rhombiB = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, verticalBlurTexture);
directionalBlurEffect.SetOutput(rhombiB);
directionalBlurEffect.Draw(context, "TripleRhombiBokeh_RhombiB_tap{0}_radius{1}", tapNumber, (int)Radius);
//Rhombi C (bottom)
blurAngle = 7f * MathUtil.Pi / 6f + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var rhombiCTmp = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, originalTexture);
directionalBlurEffect.SetOutput(rhombiCTmp);
directionalBlurEffect.Draw(context, "TripleRhombiBokeh_RhombiCTmp_tap{0}_radius{1}", tapNumber, (int)Radius);
blurAngle = -MathUtil.Pi / 6f + Phase;
directionalBlurEffect.Parameters.Set(DepthAwareDirectionalBlurUtilKeys.Direction, new Vector2((float)Math.Cos(blurAngle), (float)Math.Sin(blurAngle)));
var rhombiC = NewScopedRenderTarget2D(originalTexture.Description);
directionalBlurEffect.SetInput(0, rhombiCTmp);
directionalBlurEffect.SetOutput(rhombiC);
directionalBlurEffect.Draw(context, "TripleRhombiBokeh_RhombiC_tap{0}_radius{1}", tapNumber, (int)Radius);
// Final pass outputting the average of the 3 blurs
finalCombineEffect.SetInput(0, rhombiA);
finalCombineEffect.SetInput(1, rhombiB);
finalCombineEffect.SetInput(2, rhombiC);
finalCombineEffect.SetOutput(outputTexture);
finalCombineEffect.Parameters.Set(TripleRhombiCombineShaderKeys.RhombiTapOffsets, rhombiTapOffsets);
finalCombineEffect.Draw(context, name: "TripleRhombiBokehCombine");
}
protected override void DrawCore(RenderContext context)
{
var originalColorBuffer = GetSafeInput(0);
var originalDepthBuffer = GetSafeInput(1);
var outputTexture = GetSafeOutput(0);
if (configurationDirty)
{
SetupTechnique();
}
// Preparation phase: create different downscaled versions of the original image, later needed by the bokeh blur shaders.
// TODO use ImageMultiScaler instead?
downscaledSources.Clear();
// First we linearize the depth and compute the CoC map based on the user lens configuration.
// Render target will contain "CoC"(16 bits) "Linear depth"(16bits).
var cocLinearDepthTexture = GetScopedRenderTarget(originalColorBuffer.Description, 1f, PixelFormat.R16G16_Float);
var farPlane = context.Parameters.Get(CameraKeys.FarClipPlane);
var depthAreas = DOFAreas;
if (AutoFocus)
{
// TODO replace this by physical camera parameters (aperture, focus distance...)
var diffToTarget = (autoFocusDistanceTarget - autoFocusDistanceCurrent);
var maxAmplitude = farPlane * 0.2f;
diffToTarget = MathUtil.Clamp(diffToTarget, -maxAmplitude, maxAmplitude);
autoFocusDistanceCurrent = autoFocusDistanceCurrent + 0.1f * diffToTarget;
if (autoFocusDistanceCurrent < 1f)
{
autoFocusDistanceCurrent = 1f;
}
depthAreas = new Vector4(0.5f, autoFocusDistanceCurrent, autoFocusDistanceCurrent, autoFocusDistanceCurrent + farPlane * 0.5f);
}
coclinearDepthMapEffect.SetInput(0, originalDepthBuffer);
coclinearDepthMapEffect.SetOutput(cocLinearDepthTexture);
coclinearDepthMapEffect.Parameters.Set(CircleOfConfusionKeys.depthAreas, depthAreas);
coclinearDepthMapEffect.Draw(context, "CoC_LinearDepth");
if (AutoFocus)
{
// Reads the center depth of the previous frame and use it as a new target
// TODO single pixel is really small, average some disk area instead?
pointDepthShader.Parameters.Set(PointDepthKeys.Coordinate, new Vector2(0.5f, 0.5f));
pointDepthShader.SetInput(cocLinearDepthTexture);
pointDepthShader.SetOutput(depthCenter1x1);
pointDepthShader.Draw("Center Depth");
depthReadBack.SetInput(depthCenter1x1);
depthReadBack.Draw("Center_Depth_Readback");
var centerDepth = depthReadBack.Result[0];
autoFocusDistanceTarget = centerDepth;
}
// Find the smallest downscale we should go down to.
var maxDownscale = 0;
foreach (var cocLevel in cocLevels)
{
if (cocLevel.downscaleFactor > maxDownscale)
{
maxDownscale = cocLevel.downscaleFactor;
}
}
// Create a series of downscale, with anti-bleeding treatment
for (int i = 0; i <= maxDownscale; i++)
{
var downSizedTexture = originalColorBuffer;
if (i > 0)
{
downSizedTexture = GetScopedRenderTarget(originalColorBuffer.Description, 1f / (float)Math.Pow(2f, i), originalColorBuffer.Description.Format);
textureScaler.SetInput(0, downscaledSources[i - 1]);
textureScaler.SetOutput(downSizedTexture);
textureScaler.Draw(context, "DownScale_Factor{0}", i);
}
downscaledSources[i] = downSizedTexture;
}
// We create a blurred version of the CoC map.
// This is useful to avoid silhouettes appearing when the CoC changes abruptly.
var blurredCoCTexture = NewScopedRenderTarget2D(cocLinearDepthTexture.Description);
cocMapBlur.Radius = 6f / 720f * cocLinearDepthTexture.Description.Height; // 6 pixels at 720p
cocMapBlur.SetInput(0, cocLinearDepthTexture);
cocMapBlur.SetOutput(blurredCoCTexture);
cocMapBlur.Draw(context, "CoC_BlurredMap");
// Creates all the levels with different CoC strengths.
// (Skips level with CoC 0 which is always the original buffer.)
combineLevelsEffect.Parameters.Set(CombineLevelsFromCoCKeys.LevelCount, cocLevels.Count);
combineLevelsEffect.SetInput(0, cocLinearDepthTexture);
combineLevelsEffect.SetInput(1, blurredCoCTexture);
combineLevelsEffect.SetInput(2, originalColorBuffer);
combineLevelsFrontEffect.Parameters.Set(CombineLevelsFromCoCKeys.LevelCount, cocLevels.Count);
combineLevelsFrontEffect.SetInput(0, cocLinearDepthTexture);
combineLevelsFrontEffect.SetInput(1, blurredCoCTexture);
combineLevelsFrontEffect.SetInput(2, originalColorBuffer);
float previousCoC = 0f;
for (int i = 1; i < cocLevels.Count; i++)
{
// We render a blurred version of the original scene into a downscaled render target.
// Blur strength depends on the current level CoC value.
var levelConfig = cocLevels[i];
var textureToBlur = downscaledSources[levelConfig.downscaleFactor];
float downscaleFactor = 1f / (float)(Math.Pow(2f, levelConfig.downscaleFactor));
var blurOutput = GetScopedRenderTarget(originalColorBuffer.Description, downscaleFactor, originalColorBuffer.Description.Format);
var blurOutputFront = NewScopedRenderTarget2D(blurOutput.Description);
float blurRadius = (MaxBokehSize * BokehSizeFactor) * levelConfig.CoCValue * downscaleFactor * originalColorBuffer.Width;
if (blurRadius < 1f)
{
blurRadius = 1f;
}
//---------------------------------
// Far out-of-focus
//---------------------------------
// Pre-process the layer for the current CoC
// This removes areas which might wrongly bleed into our image when blurring.
var alphaTextureToBlur = NewScopedRenderTarget2D(textureToBlur.Description);
thresholdAlphaCoC.Parameters.Set(ThresholdAlphaCoCKeys.CoCReference, previousCoC);
thresholdAlphaCoC.Parameters.Set(ThresholdAlphaCoCKeys.CoCCurrent, levelConfig.CoCValue);
thresholdAlphaCoC.SetInput(0, textureToBlur);
thresholdAlphaCoC.SetInput(1, cocLinearDepthTexture);
thresholdAlphaCoC.SetOutput(alphaTextureToBlur);
thresholdAlphaCoC.Draw(context, "Alphaize_Far_{0}", i);
textureToBlur = alphaTextureToBlur;
// TODO Quality up: make the opaque areas "bleed" into the areas we just made transparent
// Apply the bokeh blur effect
BokehBlur levelBlur = levelConfig.blurEffect;
levelBlur.CoCStrength = levelConfig.CoCValue;
levelBlur.Radius = blurRadius; // This doesn't generate garbage if the radius value doesn't change.
levelBlur.SetInput(0, textureToBlur);
levelBlur.SetOutput(blurOutput);
levelBlur.Draw(context, "CoC_LoD_Layer_Far_{0}", i);
combineLevelsEffect.SetInput(i + 2, blurOutput);
//---------------------------------
// Near out-of-focus
//---------------------------------
// Negates CoC values and makes background objects transparent
thresholdAlphaCoCFront.Parameters.Set(ThresholdAlphaCoCFrontKeys.CoCReference, previousCoC);
thresholdAlphaCoCFront.Parameters.Set(ThresholdAlphaCoCFrontKeys.CoCCurrent, levelConfig.CoCValue);
thresholdAlphaCoCFront.SetInput(0, downscaledSources[levelConfig.downscaleFactor]);
thresholdAlphaCoCFront.SetInput(1, cocLinearDepthTexture);
thresholdAlphaCoCFront.SetOutput(alphaTextureToBlur);
thresholdAlphaCoCFront.Draw(context, "Alphaize_Near_{0}", i);
textureToBlur = alphaTextureToBlur;
// Apply the bokeh blur effect
levelBlur.SetInput(0, textureToBlur);
levelBlur.SetOutput(blurOutputFront);
levelBlur.Draw(context, "CoC_LoD_Layer_Near_{0}", i);
combineLevelsFrontEffect.SetInput(i + 2, blurOutputFront);
previousCoC = levelConfig.CoCValue;
}
// Far out-of-focus: each pixel, depending on its CoC, interpolates its color from
// the original color buffer and blurred buffer(s).
combineLevelsEffect.Parameters.Set(CombineLevelsFromCoCShaderKeys.CoCLevelValues, combineShaderCocLevelValues);
combineLevelsEffect.SetOutput(outputTexture);
combineLevelsEffect.Draw(context, "CoCLevelCombineInterpolation");
// Finally add front out-of-focus objects on the top of the scene
// TODO Quality up: instead of merging all the layers for each pixel, merge only
// the relevant layer(s) closest to the pixel CoC.
GraphicsDevice.SetBlendState(GraphicsDevice.BlendStates.AlphaBlend);
combineLevelsFrontEffect.SetOutput(outputTexture);
combineLevelsFrontEffect.Draw(context, "CoCLevelCombineInterpolationFront");
GraphicsDevice.SetBlendState(GraphicsDevice.BlendStates.Default);
// Release any reference
downscaledSources.Clear();
}