protected override void DrawCore(RenderContext context)
{
var input = GetSafeInput(0);
var output = GetSafeOutput(0);
var blurTextureSize = output.Size.Down2(UpscaleCount);
Texture outputTextureDown = null;
if (blurTextureSize.Width != 1 && blurTextureSize.Height != 1)
{
outputTextureDown = NewScopedRenderTarget2D(blurTextureSize.Width, blurTextureSize.Height, luminanceFormat, 1);
}
var luminanceMap = NewScopedRenderTarget2D(input.ViewWidth, input.ViewHeight, luminanceFormat, 1);
// Calculate the first luminance map
luminanceLogEffect.SetInput(input);
luminanceLogEffect.SetOutput(luminanceMap);
luminanceLogEffect.Draw(context);
// Downscales luminance up to BlurTexture (optional) and 1x1
multiScaler.SetInput(luminanceMap);
if (outputTextureDown == null)
{
multiScaler.SetOutput(luminance1x1);
}
else
{
multiScaler.SetOutput(outputTextureDown, luminance1x1);
}
multiScaler.Draw();
// If we have an output texture
if (outputTextureDown != null)
{
// Blur x2 the intermediate output texture
blur.SetInput(outputTextureDown);
blur.SetOutput(outputTextureDown);
blur.Draw(context);
blur.Draw(context);
// Upscale from intermediate to output
multiScaler.SetInput(outputTextureDown);
multiScaler.SetOutput(output);
multiScaler.Draw(context);
}
else
{
// TODO: Workaround to that the output filled with 1x1
Scaler.SetInput(luminance1x1);
Scaler.SetOutput(output);
Scaler.Draw(context);
}
// Calculate average luminance only if needed
if (EnableAverageLuminanceReadback)
{
readback.Draw();
var rawLogValue = readback.Result[0];
AverageLuminance = (float)Math.Pow(2.0, rawLogValue);
// In case AvergaeLuminance go crazy because of halp float/infinity precision, some code to save the values here:
//if (float.IsInfinity(AverageLuminance))
//{
// using (var stream = new FileStream("luminance_input.dds", FileMode.Create, FileAccess.Write))
// {
// input.Save(stream, ImageFileType.Dds);
// }
// using (var stream = new FileStream("luminance.dds", FileMode.Create, FileAccess.Write))
// {
// luminanceMap.Save(stream, ImageFileType.Dds);
// }
//}
}
}
