public override void Prepare()
{
PresentationParameters pp = Input.graphicsDevice.PresentationParameters;
InputEffectBloom inputBloom = Input as InputEffectBloom;
int w = inputBloom.ResultSize.X;
int h = inputBloom.ResultSize.Y;
Result = BuildRenderTarget2D(new Point(w, h));
_Half = new RenderTarget2D(Input.graphicsDevice,
w / 2,
h / 2,
false,
pp.BackBufferFormat,
DepthFormat.None);
_Quarter = new RenderTarget2D(Input.graphicsDevice,
w / 4,
h / 4,
false,
pp.BackBufferFormat,
DepthFormat.None);
_Eighth = new RenderTarget2D(Input.graphicsDevice,
w / 4,
h / 4,
false,
pp.BackBufferFormat,
DepthFormat.None);
}
public override void Calc(Texture2D tex)
{
InputEffectBloom inputBloom = Input as InputEffectBloom;
// scale to half size.
Input.graphicsDevice.SetRenderTarget(_Half);
Input.spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.Opaque);
Input.spriteBatch.Draw(tex,
new Rectangle(
0, 0,
_Half.Width, _Half.Height),
Color.White);
Input.spriteBatch.End();
// scale to quarter size
Input.graphicsDevice.SetRenderTarget(_Quarter);
Input.graphicsDevice.Clear(new Color(inputBloom.BloomThreshold, inputBloom.BloomThreshold, inputBloom.BloomThreshold));
Input.spriteBatch.Begin(0, BlendStateExtractBrightColors);
Input.spriteBatch.Draw(_Half, new Rectangle(0, 0, _Quarter.Width, _Quarter.Height), Color.White);
Input.spriteBatch.End();
// Kawase blur filter (see http://developer.amd.com/media/gpu_assets/Oat-ScenePostprocessing.pdf)
for (int i = 0; i < inputBloom.BlurPasses; i++)
{
Input.graphicsDevice.SetRenderTarget(_Eighth);
Input.graphicsDevice.Clear(Color.Black);
int w = _Quarter.Width;
int h = _Quarter.Height;
float brightness = 0.25f;
// On the first pass, scale brightness to restore full range after the threshold subtraction.
if (i == 0)
{
brightness /= (1 - inputBloom.BloomThreshold);
}
// On the final pass, apply tweakable intensity adjustment.
if (i == inputBloom.BlurPasses - 1)
{
brightness *= inputBloom.BloomIntensity;
}
Color tint = new Color(brightness, brightness, brightness);
Input.spriteBatch.Begin(SpriteSortMode.Deferred,
BlendStateAdditiveBlur);
int j = i;
Vector2 v = new Vector2(0.5f, 0.5f); // * .3f; //todo
Input.spriteBatch.Draw(_Quarter, v, new Rectangle(j + 1, j + 1, w, h), tint);
Input.spriteBatch.Draw(_Quarter, v, new Rectangle(-j, j + 1, w, h), tint);
Input.spriteBatch.Draw(_Quarter, v, new Rectangle(j + 1, -j, w, h), tint);
Input.spriteBatch.Draw(_Quarter, v, new Rectangle(-j, -j, w, h), tint);
Input.spriteBatch.End();
Swap(ref _Quarter, ref _Eighth);
}
// Combine the original scene and bloom images.
Input.graphicsDevice.SetRenderTarget(Result);
Input.spriteBatch.Begin(SpriteSortMode.Deferred, BlendState.Opaque);
Input.spriteBatch.Draw(tex,
new Rectangle(0, 0,
Result.Width, Result.Height),
Color.White);
Input.spriteBatch.End();
Input.spriteBatch.Begin(SpriteSortMode.Deferred, BlendStateCombineFinalResult);
Input.spriteBatch.Draw(_Quarter,
new Rectangle(0, 0,
Result.Width, Result.Height),
Color.White);
Input.spriteBatch.End();
Input.graphicsDevice.SetRenderTarget(null);
}
