public SkyboxGeneratorContext(SkyboxAsset skybox, IDatabaseFileProviderService fileProviderService)
{
Skybox = skybox ?? throw new ArgumentNullException(nameof(skybox));
Services = new ServiceRegistry();
Services.AddService(fileProviderService);
Content = new ContentManager(Services);
Services.AddService <IContentManager>(Content);
Services.AddService(Content);
GraphicsDevice = GraphicsDevice.New();
GraphicsDeviceService = new GraphicsDeviceServiceLocal(Services, GraphicsDevice);
Services.AddService(GraphicsDeviceService);
var graphicsContext = new GraphicsContext(GraphicsDevice);
Services.AddService(graphicsContext);
EffectSystem = new EffectSystem(Services);
EffectSystem.Compiler = EffectCompilerFactory.CreateEffectCompiler(Content.FileProvider, EffectSystem);
Services.AddService(EffectSystem);
EffectSystem.Initialize();
((IContentable)EffectSystem).LoadContent();
((EffectCompilerCache)EffectSystem.Compiler).CompileEffectAsynchronously = false;
RenderContext = RenderContext.GetShared(Services);
RenderDrawContext = new RenderDrawContext(Services, RenderContext, graphicsContext);
}
public static SkyboxResult Compile(SkyboxAsset asset, SkyboxGeneratorContext context)
{
if (asset == null)
{
throw new ArgumentNullException("asset");
}
if (context == null)
{
throw new ArgumentNullException("context");
}
var result = new SkyboxResult {
Skybox = new Skybox()
};
var parameters = context.Parameters;
var skybox = result.Skybox;
skybox.Parameters = parameters;
var cubemap = asset.CubeMap;
if (cubemap == null)
{
return(result);
}
// load the skybox texture from the asset.
var reference = AttachedReferenceManager.GetAttachedReference(cubemap);
var skyboxTexture = context.Content.Load <Texture>(BuildTextureForSkyboxGenerationLocation(reference.Url), ContentManagerLoaderSettings.StreamingDisabled);
if (skyboxTexture.ViewDimension == TextureDimension.Texture2D)
{
var cubemapSize = (int)Math.Pow(2, Math.Ceiling(Math.Log(skyboxTexture.Width / 4) / Math.Log(2))); // maximum resolution is around horizontal middle line which composes 4 images.
skyboxTexture = CubemapFromTextureRenderer.GenerateCubemap(context.Services, context.RenderDrawContext, skyboxTexture, cubemapSize);
}
else if (skyboxTexture.ViewDimension != TextureDimension.TextureCube)
{
result.Error($"SkyboxGenerator: The texture type ({skyboxTexture.ViewDimension}) used as skybox is not supported. Should be a Cubemap or a 2D texture.");
return(result);
}
// If we are using the skybox asset for lighting, we can compute it
// Specular lighting only?
if (!asset.IsSpecularOnly)
{
// -------------------------------------------------------------------
// Calculate Diffuse prefiltering
// -------------------------------------------------------------------
var lamberFiltering = new LambertianPrefilteringSHNoCompute(context.RenderContext)
{
HarmonicOrder = (int)asset.DiffuseSHOrder,
RadianceMap = skyboxTexture
};
lamberFiltering.Draw(context.RenderDrawContext);
var coefficients = lamberFiltering.PrefilteredLambertianSH.Coefficients;
for (int i = 0; i < coefficients.Length; i++)
{
coefficients[i] = coefficients[i] * SphericalHarmonics.BaseCoefficients[i];
}
skybox.DiffuseLightingParameters.Set(SkyboxKeys.Shader, new ShaderClassSource("SphericalHarmonicsEnvironmentColor", lamberFiltering.HarmonicOrder));
skybox.DiffuseLightingParameters.Set(SphericalHarmonicsEnvironmentColorKeys.SphericalColors, coefficients);
}
// -------------------------------------------------------------------
// Calculate Specular prefiltering
// -------------------------------------------------------------------
var specularRadiancePrefilterGGX = new RadiancePrefilteringGGXNoCompute(context.RenderContext);
var textureSize = asset.SpecularCubeMapSize <= 0 ? 64 : asset.SpecularCubeMapSize;
textureSize = (int)Math.Pow(2, Math.Round(Math.Log(textureSize, 2)));
if (textureSize < 64)
{
textureSize = 64;
}
// TODO: Add support for HDR 32bits
var filteringTextureFormat = skyboxTexture.Format.IsHDR() ? skyboxTexture.Format : PixelFormat.R8G8B8A8_UNorm;
//var outputTexture = Texture.New2D(graphicsDevice, 256, 256, skyboxTexture.Format, TextureFlags.ShaderResource | TextureFlags.UnorderedAccess, 6);
using (var outputTexture = Texture.New2D(context.GraphicsDevice, textureSize, textureSize, true, filteringTextureFormat, TextureFlags.ShaderResource | TextureFlags.RenderTarget, 6))
{
specularRadiancePrefilterGGX.RadianceMap = skyboxTexture;
specularRadiancePrefilterGGX.PrefilteredRadiance = outputTexture;
specularRadiancePrefilterGGX.Draw(context.RenderDrawContext);
var cubeTexture = Texture.NewCube(context.GraphicsDevice, textureSize, true, filteringTextureFormat);
context.RenderDrawContext.CommandList.Copy(outputTexture, cubeTexture);
cubeTexture.SetSerializationData(cubeTexture.GetDataAsImage(context.RenderDrawContext.CommandList));
skybox.SpecularLightingParameters.Set(SkyboxKeys.Shader, new ShaderClassSource("RoughnessCubeMapEnvironmentColor"));
skybox.SpecularLightingParameters.Set(SkyboxKeys.CubeMap, cubeTexture);
}
// TODO: cubeTexture is not deallocated
return(result);
}
