internal AmbientOcclusionTechnique( GBufferTechnique gbufferTechnique, ShaderProgram postVertProg, ShaderProgram aoFragProg, ShaderProgram boxBlurFragProg, RenderScene scene, Logger logger = null) { if (gbufferTechnique == null) { throw new NullReferenceException(nameof(gbufferTechnique)); } if (postVertProg == null) { throw new ArgumentNullException(nameof(postVertProg)); } if (aoFragProg == null) { throw new ArgumentNullException(nameof(aoFragProg)); } if (boxBlurFragProg == null) { throw new ArgumentNullException(nameof(boxBlurFragProg)); } if (scene == null) { throw new NullReferenceException(nameof(scene)); } this.gbufferTechnique = gbufferTechnique; this.scene = scene; this.logger = logger; //Create renderer for rendering the ao texture renderer = new Renderer(scene, logger); renderer.AddSpecialization(scene.SwapchainCount); renderer.AddSpecialization(sampleKernelSize); renderer.AddSpecialization(sampleRadius); renderer.AddSpecialization(sampleBias); swapchainIndexPushDataBinding = renderer.AddPushData <int>(); targetSizePushBinding = renderer.AddPushData <Int2>(); //Create random for generating the kernel and noise (using a arbitrary fixed seed) IRandom random = new ShiftRandom(seed: 1234); //Create the sample kernel Span <Float4> sampleKernel = stackalloc Float4[sampleKernelSize]; GenerateSampleKernel(random, sampleKernel); sampleKernelBuffer = DeviceBuffer.UploadData <Float4>( sampleKernel, scene, BufferUsages.UniformBuffer); //Create the rotation noise texture Float4Texture rotationNoiseTexture = TextureUtils.CreateRandomFloatTexture( random, min: (-1f, -1f, 0f, 0f), max: (1f, 1f, 0f, 0f), size: (noiseSize, noiseSize)); rotationNoiseSampler = new DeviceSampler(scene.LogicalDevice, texture: DeviceTexture.UploadTexture(rotationNoiseTexture, scene), repeat: true, pointFilter: true); //Add full-screen object for drawing the composition renderObject = new AttributelessObject(scene, vertexCount: 3, new TextureInfo[0]); renderer.AddObject(renderObject, postVertProg, aoFragProg, debugName: "fullscreen"); //Create a BlurTechnique for blurring the ao texture (to hide the ao sample pattern) blurTechnique = new BoxBlurTechnique( postVertProg, boxBlurFragProg, blurSampleRange, sampleScale: 1f, scene, logger); }