delt06 / dx12-renderer

A DirectX 12 renderer featuring Deferred and Forward rendering paths, PBR, various post-processing effects, and more.

Hello there 👋

I'm a Unity Developer and a Graphics Programmer (DX12, C++).

I currently work on Toon RP: a Unity Scriptable Render Pipeline (SRP) designed around stylized graphics.

dx12-renderer's Issues

Cook-Torrance BRDF

• Add necessary channels (buffers) to GBuffer
• Implement Cook-Torrance BRDF: https://learnopengl.com/PBR/Lighting
• Implement Image-Based Lighting
  • Diffuse: https://learnopengl.com/PBR/IBL/Diffuse-irradiance
  • Specular: https://learnopengl.com/PBR/IBL/Specular-IBL
    • BRDF Integration
    • Prefilter

SSAO

• Generate SSAO texture
• Blur SSAO texture
  • Write to GBuffer's AO channel

GrassDemo

• Many meshes (use execute indirect to cull the invisible ones)
  • 500k - works
  • 2kk - works
• Set root constants (index of grass), access per-instance data via structured buffers

Test GPU Performance (1280x720, 500k colored cube instances):

Implementation Type	Dispatch (ms)	ExecuteIndirect (ms)
Constant Buffers	1.44	2.18
Index in 32 bit Constants, separate buffers for model and material	1.43	1.13
Index in 32 bit Constants, one buffer for all data, pass color as an interpolated attribute	1.43	1.42

• Add actual grass mesh
• AA
• Vertex Animations
• Random Placement
• Chunks

Chunks performance test (Full HD, Release, 4000000 grass blades):

Mode	FPS	Increase
No Chunks	120	0%
9 Chunks	300	250%
16 Chunks	310	258%
25 Chunks	255	213%

• Culling Toggle

HDR

• Convert light buffer to HDR
• Tone mapping and gamma correction
• Auto exposure:
  • Average Luminance:
    • https://www.alextardif.com/HistogramLuminance.html
    • https://bruop.github.io/exposure/
  • Tone Mapping operators:
    • https://bruop.github.io/tonemapping/

GPU texture compression

• Improve DDS loading
• Convert all textures to BC*

GPU Particles simulation

Offload the particle system's simulation to GPU via compute shaders.

Generic Shader and Material classes

• All use the same CommonRootSignature
• Materials store a map of material parameters
• Shaders use reflection to figure out which how to map a uniform name to a root signature parameter
• Refactor all demos to use this
  • DeferredLightingDemo
  • AnimationsDemo
  • LightingDemo
• Profile and optimize (if possible) CPU performance

ToonDemo

• Phong Shader
  • Diffuse
  • Specular
• Add textured models
• AA
• Screen-Space Outlines
• Anti-aliasing for outlines
• Hard, crisp shadows
• SSAO (via depth pre-pass)

TAA

• Velocity Buffer
• Jitter
• History
• Resolve

Grass GPU Sorting

https://www.alanzucconi.com/2017/12/13/gpu-sorting-1/
https://www.youtube.com/watch?v=Ibe1JBF5i5Y

Deferred Lighting

• GBuffer Pass
• Light Passes
  • Directional
  • Point
    • Basis
    • Stencil logic
  • Spot
  • Capsule
  • Ambient

Shadow Mapping

• Shadow casting
• Shadow receiving
• Pass biases in the constant buffer
• Handle sampling outside UV range
• PCF: 16-sample Poisson sampling with early bail
  • See this
• Automatic light projection matrix (using bounding volumes of game objects)
  • Idea
  • Create an AABB for the whole scene, make a naive bounding sphere for it
• (Optional) Point Light shadows
  • Omnidirectional (cubemap) shadow map generation
  • Shadow receiving
  • Handle bias application in ShadowCaster_VertexShader. User a bool flag to distinguish
• Update README with details and new screenshot

Spot Lights

• Lighting
  • https://github.com/jpvanoosten/LearningDirectX12/blob/v0.0.4/Tutorial4/shaders/HDR_PS.hlsl
• Shadows
  • https://github.com/VictorGordan/opengl-tutorials/tree/main/YoutubeOpenGL%2026%20-%20Shadow%20Maps%20(Spotlights%20%26%20Point%20Lights)
• Update README with new features and a screenshot

Deferred Lighting Demo: Skybox Disappears after first switch to full-screen

SSLR

• Tracing
• Binary search
• Blur
• Fading
• Combine with cubemap reflections

Skinned Meshes

• Load a model from FBX
• Load bones and animations; play animations and draw bones
• Load weights
• Implement skinning in the vertex shader
• State blending
• State merging (i.e., avatar masks)
• Update README: add links and info about the demo

Mipmap generation yields black borders

Apparently, high (> 4) mipmap levels are black.

Mipmaps 1-4 contain other mips in the left-top corner: