/// <summary>
/// Initializes a new instance of the <see cref="HdrFilter"/> class.
/// </summary>
/// <param name="graphicsService">The graphics service.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="graphicsService"/> is <see langword="null"/>.
/// </exception>
public HdrFilter(IGraphicsService graphicsService)
: base(graphicsService)
{
_effect = GraphicsService.Content.Load <Effect>("DigitalRune/PostProcessing/HdrFilter");
_viewportSizeParameter = _effect.Parameters["ViewportSize"];
_bloomThresholdParameter = _effect.Parameters["BloomThreshold"];
_middleGrayParameter = _effect.Parameters["MiddleGray"];
_minExposureParameter = _effect.Parameters["MinExposure"];
_maxExposureParameter = _effect.Parameters["MaxExposure"];
_blueShiftColorParameter = _effect.Parameters["BlueShiftColor"];
_blueShiftParameter = _effect.Parameters["BlueShift"];
_bloomIntensityParameter = _effect.Parameters["BloomIntensity"];
_sceneTextureParameter = _effect.Parameters["SceneTexture"];
_luminanceTextureParameter = _effect.Parameters["LuminanceTexture"];
_bloomTextureParameter = _effect.Parameters["BloomTexture"];
_brightnessPass = _effect.CurrentTechnique.Passes["Brightness"];
_combinePass = _effect.CurrentTechnique.Passes["Combine"];
_combineWithBlueShiftPass = _effect.CurrentTechnique.Passes["CombineWithBlueShift"];
BloomIntensity = 1;
BloomThreshold = 0.2f;
DownsampleFactor = 4;
MiddleGray = 0.18f;
MinExposure = 0.01f;
MaxExposure = 2.0f;
// The physically based blue shift color is in CIE Yxy: x = 0.3 and y = 0.3.
// As RGB this is (1.05, 0.97, 1.27). This color should be scaled by a user-defined
// scale. The scotopic luminance computed in the shader is usually in the range [0, 4].
// Therefore, we apply a scale factor of 0.25 as a default.
BlueShiftColor = new Vector3(1.05f, 0.97f, 1.27f) * 0.25f;
BlueShiftCenter = 0.04f;
BlueShiftRange = 1;
_blur = new Blur(graphicsService);
_blur.InitializeGaussianBlur(7, 7.0f / 3.0f, true);
_luminance = new LuminanceFilter(graphicsService);
_luminanceTarget = graphicsService.RenderTargetPool.Obtain2D(_luminance.DefaultTargetFormat);
_downsampleFilter = PostProcessHelper.GetDownsampleFilter(graphicsService);
var defaultTargetFormat = DefaultTargetFormat;
defaultTargetFormat.SurfaceFormat = SurfaceFormat.Color;
DefaultTargetFormat = defaultTargetFormat;
}
/// <summary>
/// Initializes a new instance of the <see cref="BloomFilter"/> class.
/// </summary>
/// <param name="graphicsService">The graphics service.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="graphicsService"/> is <see langword="null"/>.
/// </exception>
public BloomFilter(IGraphicsService graphicsService)
: base(graphicsService)
{
_effect = GraphicsService.Content.Load <Effect>("DigitalRune/PostProcessing/BloomFilter");
_viewportSizeParameter = _effect.Parameters["ViewportSize"];
_bloomThresholdParameter = _effect.Parameters["BloomThreshold"];
_bloomIntensityParameter = _effect.Parameters["BloomIntensity"];
_bloomSaturationParameter = _effect.Parameters["BloomSaturation"];
_sceneTextureParameter = _effect.Parameters["SceneTexture"];
_bloomTextureParameter = _effect.Parameters["BloomTexture"];
_brightnessPass = _effect.CurrentTechnique.Passes["Brightness"];
_combinePass = _effect.CurrentTechnique.Passes["Combine"];
_blur = new Blur(graphicsService);
_blur.InitializeGaussianBlur(7, 7.0f / 3.0f, true);
_downsampleFilter = PostProcessHelper.GetDownsampleFilter(graphicsService);
Threshold = 0.7f;
Intensity = 1.5f;
Saturation = 0.5f;
DownsampleFactor = 4;
}
/// <summary>
/// Initializes a new instance of the <see cref="SsaoFilter"/> class.
/// </summary>
/// <param name="graphicsService">The graphics service.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="graphicsService"/> is <see langword="null"/>.
/// </exception>
public SsaoFilter(IGraphicsService graphicsService)
: base(graphicsService)
{
_effect = GraphicsService.Content.Load <Effect>("DigitalRune/PostProcessing/SsaoFilter");
_farParameter = _effect.Parameters["Far"];
_radiusParameter = _effect.Parameters["Radius"];
_strengthParameter = _effect.Parameters["Strength"];
_maxDistancesParameter = _effect.Parameters["MaxDistances"];
_viewportSizeParameter = _effect.Parameters["ViewportSize"];
_sourceTextureParameter = _effect.Parameters["SourceTexture"];
_gBuffer0Parameter = _effect.Parameters["GBuffer0"];
_occlusionTextureParameter = _effect.Parameters["OcclusionTexture"];
_createLinesAPass = _effect.CurrentTechnique.Passes["CreateLinesA"];
_createLinesBPass = _effect.CurrentTechnique.Passes["CreateLinesB"];
_blurHorizontalPass = _effect.CurrentTechnique.Passes["BlurHorizontal"];
_blurVerticalPass = _effect.CurrentTechnique.Passes["BlurVertical"];
_combinePass = _effect.CurrentTechnique.Passes["Combine"];
_copyPass = _effect.CurrentTechnique.Passes["Copy"];
Radii = new Vector2F(0.01f, 0.02f);
MaxDistances = new Vector2F(0.5f, 1.0f);
Strength = 1f;
NumberOfBlurPasses = 1;
DownsampleFactor = 2;
Quality = 2;
Scale = new Vector2F(0.5f, 2f);
CombineWithSource = true;
_blur = new Blur(graphicsService);
_blur.InitializeGaussianBlur(7, 7 / 3, true);
_copyFilter = PostProcessHelper.GetCopyFilter(graphicsService);
_downsampleFilter = PostProcessHelper.GetDownsampleFilter(graphicsService);
Random random = new Random(123456);
Vector3[] vectors = new Vector3[9];
// 16 random vectors for Crytek-style point samples.
//for (int i = 0; i < vectors.Length; i++)
// vectors[i] = (Vector3)random.NextQuaternion().Rotate(Vector3.One).Normalized;
// //* random.NextFloat(0.5f, 1) // Note: StarCraft 2 uses varying length to vary the sample offset length.
// We create rotated random vectors with uniform distribution in 360°. Each random vector
// is further rotated with small random angle.
float jitterAngle = ConstantsF.TwoPi / vectors.Length / 4;
for (int i = 0; i < vectors.Length; i++)
{
vectors[i] = (Vector3)(Matrix.CreateRotationZ(ConstantsF.TwoPi * i / vectors.Length + random.NextFloat(-jitterAngle, jitterAngle)) * new Vector3(1, 0, 0)).Normalized;
}
// Permute randomVectors.
for (int i = 0; i < vectors.Length; i++)
{
MathHelper.Swap(ref vectors[i], ref vectors[random.Next(i, vectors.Length - 1)]);
}
// Scale random vectors.
for (int i = 0; i < vectors.Length; i++)
{
vectors[i].Z = random.NextFloat(Scale.X, Scale.Y);
}
_effect.Parameters["RandomVectors"].SetValue(vectors);
}