A tracker of notable real-time graphics features, the kind found in high-end shader packs and in large commercial engines, checked against what SleakEngine actually ships.

✓ green means implemented in SleakEngine and verified in the source tree. ✓ grey means not implemented. The notes column names the implementing file or class, and records which backends carry the feature when it is not all four.

Backend shorthand: VK (Vulkan), GL (OpenGL), DX11, DX12. Vulkan is the most complete backend; DX11 covers forward rendering with shadows and tonemapping, DX12 covers forward rendering with shadows.

Rendering paths

Status	Feature	SleakEngine notes
✓	Deferred shading	VulkanDeferred.cpp GBuffer + lighting_pass.frag; GL path in OpenGLRenderer.cpp with gbuffer_gl / lighting_pass_gl
✓	Forward rendering	Renderer::SetDeferredEnabled, default_shader variants on all four backends
✓	Forward transparent pass	VulkanRenderer::BeginForwardTransparentPass, routed by RenderCommandQueue.cpp after lighting
✓	Forward+ / clustered shading	-
✓	Visibility buffer	-

Geometry

Status	Feature	SleakEngine notes
✓	Static mesh rendering	MeshComponent, Sleak::MeshData
✓	Bulk static geometry batching	Sleak::MeshBatch handle pool, BeginBatch / Draw / EndBatch
✓	Model import (FBX, glTF, OBJ)	Sleak::ModelLoader, Assimp-backed, builds the GameObject tree
✓	Skeletal skinning	Sleak::Skeleton (256 bones), skinned_shader variants, forward pass only
✓	Hardware instancing	RenderContext::DrawInstance / DrawIndexedInstance on all four backends; instance data must come from gl_InstanceIndex, there is no per-instance attribute stream
✓	Custom / procedural vertex formats	Sleak::VertexLayoutDesc + VertexFormatRegistry::Register, consumed by MeshBatch::CreateMesh
✓	Morph targets / blend shapes	-
✓	Mesh LOD	no LOD selection; LOD in the tree refers to texture mip levels only
✓	Hierarchical LOD (HLOD)	-
✓	Tessellation	no hull/domain or tessellation control/evaluation stages
✓	Mesh shaders	-
✓	Virtualized geometry (Nanite class)	-

Lighting

Status	Feature	SleakEngine notes
✓	Directional lights	Sleak::DirectionalLight, shadow-casting light picked in LightManager::UpdateAndBind
✓	Point lights	Sleak::PointLight, UE4-style inverse-square falloff in default_shader_gl.frag
✓	Spot lights	Sleak::SpotLight, inner/outer cone smoothstep
✓	Physically based shading	Cook-Torrance GGX + Smith + Fresnel-Schlick in lighting_pass.frag and default_shader_gl.frag
✓	Image-based lighting	OpenGLIBL.cpp bakes irradiance, prefiltered specular, and the split-sum BRDF LUT; the Vulkan side (VulkanIBL.cpp) allocates 1x1 black stubs with no bake, so GL only
✓	Area lights	Sleak::AreaLight packs GPU type 3, but no shader branches on it and it shades as a point light
✓	Baked lightmaps	-
✓	Light probes / reflection captures	-
✓	Dynamic global illumination (Lumen class)	-
✓	Screen space global illumination	-
✓	Distance field ambient occlusion	-

Shadows

Status	Feature	SleakEngine notes
✓	Shadow mapping	VulkanShadow.cpp, shadow_depth.vert, hardware comparison sampler
✓	Runtime shadow map resolution	Renderer::SetShadowMapResolution, deferred apply through ApplyShadowResolutionChange
✓	PCF filtering	12-tap rotated Vogel disk with interleaved gradient noise, PCFFilter in lighting_pass.frag
✓	PCSS / contact hardening	blocker search in default_shader.frag, default_shader_gl.frag, skinned_shader.frag; forward path only, deferred uses fixed-radius PCF
✓	Cascaded shadow maps	single shadow frustum, no cascade split
✓	Virtual shadow maps	-
✓	Ray traced shadows	-
✓	Contact shadows (screen space)	-
✓	Point / spot light shadows	only the directional light casts

Screen space and post processing

Status	Feature	SleakEngine notes
✓	SSAO	VulkanSSAO.cpp and ExecuteSSAOPass in OpenGLRenderer.cpp, hemisphere kernel from SSAOKernel.hpp, separate blur pass
✓	Screen space reflections	VulkanSSR.cpp, ssr.frag; VK only
✓	Temporal anti-aliasing	VulkanTAA.cpp, taa.frag, Halton sub-pixel jitter applied to the WVP push constant; VK only
✓	MSAA	Renderer::SetMSAASampleCount, VK pipelines and GL m_msaaFBO; forward only, the deferred path silently forces 1 sample because a multisampled GBuffer is too expensive
✓	Bloom	VulkanBloom.cpp, threshold + downsample + upsample + composite chain at half resolution; VK only
✓	Tone mapping	ACES filmic (Narkowicz fit) in tonemap.frag, tonemap_gl.frag, tonemap.hlsl, tonemap_dx12.hlsl
✓	Exposure and gamma control	PostProcessUBO, Renderer::SetExposure / SetGamma
✓	HDR render target	CapHDRTarget, RGBA16F scene image through the lighting, bloom, and tonemap chain
✓	FXAA	GraphicsConfig::fxaaEnabled exists but no backend reads it
✓	Upscaling (TSR / DLSS / FSR class)	-
✓	Render scale	GraphicsConfig::renderScale is declared but unread
✓	HDR display output (HDR10 / scRGB)	swapchain selects VK_COLOR_SPACE_SRGB_NONLINEAR_KHR only
✓	Auto exposure / eye adaptation	config fields only, no luminance histogram or reduction pass
✓	Color grading / LUT	-
✓	Motion blur	-
✓	Depth of field	-
✓	Vignette	config field only, unread
✓	Chromatic aberration	-
✓	Film grain	config field only, unread
✓	Lens flare	-
✓	Velocity / motion vector buffer	CapVelocity is declared but no backend produces one; TAA reprojects from dilated depth

Atmosphere and environment

Status	Feature	SleakEngine notes
✓	Cubemap skybox	Sleak::Skybox six-face constructor, skybox.frag
✓	Equirectangular panorama sky	SkyboxMode::Panorama
✓	Procedural gradient sky	SkyboxMode::Gradient, three-color vertical blend
✓	Distance fog	LightManager::SetFogDistances, ApplyFog in lighting_pass.frag
✓	Exponential height fog	LightManager::SetHeightFogDensity / SetHeightFogFalloff, stacks with distance fog
✓	Physical sky / atmospheric scattering	gradient sky only, no Rayleigh or Mie model
✓	Volumetric fog	analytic fog only, no froxel volume
✓	Volumetric clouds	-
✓	God rays / light shafts	CapLightShaft and the lightShaft* config fields are declared, no backend implements the pass
✓	Water rendering	game side; the engine supplies the transparent pass hook via transparentShaderStem
✓	Planar reflections	-
✓	Rain and weather effects	-
✓	Wind / foliage animation	-

Materials and texturing

Status	Feature	SleakEngine notes
✓	Normal mapping	TBN basis in gbuffer.frag with Z reconstruction for two-channel compressed normals
✓	Metallic / roughness workflow	Sleak::Material factors and maps, packed into GBuffer RT1 and RT2
✓	Ambient occlusion maps	texAO sampled in gbuffer.frag, combined with SSAO in the lighting pass
✓	Emissive maps	texEmissive times emissiveFactor, HDR intensity
✓	Alpha cutout	MaterialRenderMode::Cutout with SetAlphaCutoff
✓	Alpha-blended transparency	MaterialRenderMode::Transparent, routed to the forward transparent pass
✓	Mipmap generation	VulkanTexture::GenerateMipmaps blit chain, glGenerateMipmap on GL
✓	Parallax occlusion mapping	-
✓	Subsurface scattering	-
✓	Refraction / translucency	alpha blending only, no scene-color refraction
✓	Deferred decals	-
✓	Virtual texturing	-
✓	Texture streaming	textures upload whole at load time
✓	Texture atlasing	game side
✓	Anisotropic filtering	samplers use linear filtering without an anisotropy request

Ray tracing

Status	Feature	SleakEngine notes
✓	Ray traced reflections	no acceleration structures in any backend
✓	Ray traced global illumination	-
✓	Ray traced ambient occlusion	-
✓	Ray traced shadows	-
✓	Path tracing	-

Performance and culling

Status	Feature	SleakEngine notes
✓	View frustum culling	Sleak::CullingSystem::IsVisible, planes from Sleak::ViewFrustum
✓	CPU software occlusion culling	CullingSystem.cpp rasterizes submitted occluder volumes into a low-res depth buffer
✓	Data-driven quality presets	GraphicsConfig::Preset, applied in one shot by Application::ApplyGraphicsConfig
✓	Debug wireframe visualization	Sleak::DebugLineRenderer lines, AABBs, and spheres
✓	GPU occlusion queries	-
✓	GPU-driven rendering / indirect draw	no indirect draw entry points on RenderContext

Particles and effects

Status	Feature	SleakEngine notes
✓	CPU particle system	-
✓	GPU particle system	-