public SoftwareImage <T> Generate()
{
const float ratio = 0.25f;
var tr = Image.PixelTransformer;
var ret = new SoftwareImage <T>(Image.Width / 2, Image.Height / 2, tr);
for (int y = 0; y < Image.Height; ++y)
{
for (int x = 0; x < Image.Width; ++x)
{
ref var p = ref ret.GetPixel(x / 2, y / 2);
p = tr.Add(p, tr.Scale(Image.GetPixel(x, y), ratio));
}
}
private static T GetImagePixel <T>(SoftwareImage <T> image, int x, int y) where T : unmanaged
{
x = (x + image.Width) % image.Width;
y = (y + image.Height) % image.Height;
return(image.GetPixel(x, y));
}
static void Main(string[] args)
{
var normalMap = new SoftwareImage <R32G32B32A32F>(800, 600, new R32G32B32A32FTransformer());
normalMap.LoadRawDataFile(TestSceneCompiled("OutputNormal.raw"));
var viewDirMap = new SoftwareImage <R32G32B32A32F>(800, 600, new R32G32B32A32FTransformer());
viewDirMap.LoadRawDataFile(TestSceneCompiled("OutputViewDir.raw"));
SoftwareImage <R32G32B32A32F> skybox = HdrImageLoader.Read(TestSceneResource("473-free-hdri-skies-com.hdr"));
SoftwareImage <R32G32B32A32F> skyboxSpecular = skybox;
{
skyboxSpecular = new HalfSize <R32G32B32A32F>(skyboxSpecular).Generate();
skyboxSpecular = new HalfSize <R32G32B32A32F>(skyboxSpecular).Generate();
skyboxSpecular = new HalfSize <R32G32B32A32F>(skyboxSpecular).Generate();
skyboxSpecular = new HalfSize <R32G32B32A32F>(skyboxSpecular).Generate();
skyboxSpecular = new HalfSize <R32G32B32A32F>(skyboxSpecular).Generate();
}
SoftwareImage <R32G32B32A32F> skyboxDiffuse = skybox;
{
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
skyboxDiffuse = new HalfSize <R32G32B32A32F>(skyboxDiffuse).Generate();
}
var p = skybox.PixelTransformer;
//System.Drawing.Bitmap does not support concurrent SetPixel. Use our own instead.
var bitmap = new SoftwareImage <R8G8B8A8>(800, 600, new R8G8B8A8Transformer());
Parallel.For(0, 600, (int y) =>
{
var rand = _rand.Value;
for (int x = 0; x < 800; ++x)
{
var normal = normalMap.GetPixel(x, y);
if (normal.R == 0 && normal.G == 0 && normal.B == 0)
{
continue;
}
var viewDir = viewDirMap.GetPixel(x, y);
var n = new Vector3(normal.R, normal.G, normal.B);
var e = Vector3.Normalize(-new Vector3(viewDir.R, viewDir.G, viewDir.B));
var l = Vector3.Normalize(2 * Vector3.Dot(n, e) * n - e);
R32G32B32A32F color = default;
//Specular
{
//color = p.Add(color, SkyboxHelper.SampleEquirectangularMap(skyboxSpecular, l));
const int SpecularSampleCount = 40;
var sampler = new SphereDirectionalSampler(rand, l, (float)Math.PI / 2, SpecularSampleCount);
R32G32B32A32F total = default;
for (int sample = 0; sample < sampler.SampleCount; ++sample)
{
var sampleDir = sampler.Sample(sample);
if (Vector3.Dot(sampleDir, n) < 0)
{
continue;
}
var cc = SkyboxHelper.SampleEquirectangularMap(skyboxSpecular, sampleDir);
total = p.Add(total, p.Scale(cc, Vector3.Dot(n, sampleDir) * (float)BRDF(n, sampleDir, e)));
}
color = p.Add(color, p.Scale(total, 1f / sampler.SampleCount * 5));
}
//Diffuse
{
const int DiffuseSampleCount = 10;
var sampler = new SphereDirectionalSampler(rand, n, (float)Math.PI / 2, DiffuseSampleCount);
R32G32B32A32F total = default;
for (int sample = 0; sample < sampler.SampleCount; ++sample)
{
var sampleDir = sampler.Sample(sample);
var cc = SkyboxHelper.SampleEquirectangularMap(skyboxDiffuse, sampleDir);
total = p.Add(total, p.Scale(cc, Vector3.Dot(n, sampleDir) / (float)Math.PI));
}
color = p.Add(color, p.Scale(total, 1f / sampler.SampleCount * 0));
}
var rgb = p.ToColor(color);
bitmap.GetPixel(x, y) = new R8G8B8A8
{
R = rgb.R,
G = rgb.G,
B = rgb.B,
A = 255,
};
}
//}
});
bitmap.ToBitmap().Save(TestSceneCompiled("Offline.png"));
}
