pierodn / gdevice Goto Github PK

• painting landscapes
• Shadows and horizon like in here

• Presentation doc
  • Donation buttons
    • Wise card + PayPal

• GitHub
• Patreon
• ko-fi.com
• Kickstarter
• IDA crowdfunding
• YouTube (tutorials)
• Medium

• painting landscapes
• Shadows and horizon like in here

Separate application logic from engine

• SOC
  • application logic to application
  • terrain LOD to parallel spatial
  • terrain generation to generator
  • renderer to renderer

Application deals with OS and GPU

• Shared memory (Buffer<>), barriers
• Renderer<OpenGL|Vulkan...>
• ECS design: Node<Heightmap>
  • Examples: lecs, ECS
• Serializable<Image>
• Remove Light, IndexBuffer, etc.
• Disentangle Node from Renderer.
• Disentangle Node<Heightmap> too
• VertexBuffer = array of buffers
• Texture = array of buffers

Rendering Engine

• Renderer<Vulkan>
• RenderingContext
• Scenegraph
  • Node<Terrain>
  • Node<Clipmap>
  • ECS
• Shader<GLSL>

• FIX normal !!
• Vertical tessellation
• Improve extrusion
• Hard verticality (inject 2nd point)

Parameters

• Shader parameters
  • vec4 detailmap
  • vec4[4] colors
    alpha = specularity [-1..1]
• Vertex parameters
  • vec4 mixmap
  • vec4 color
    alpha = specularity [-1..1]

How this is supposed to work

• A material is a set of 4 fixed luma textures and 4 corresponding colors.
• It is set per draw call.
• Every vertex comes with a mixmap that will tell how to mix the 4 textures.
• When [0..1], the dot(mixmap, detailmap) becomes the 5h texture and it gets the vertex color.
• When [-1..0], they mix by height (together with the 5h one).

Acceptance test

• polished stone
• muddy ground
• rusty copper
• icy rock
• sand (with shiny particles)
• snow (with shiny particles)
• Shadertoy material editor

Comparison with PBR

• Specularity is Roughness and includes Metallicity.
• Albedo or diffuse color is just color (and it is F0).

• Use asphalt detail at LOD0.
• Tweak smoothsteps: outcrops
• FIX get the detail color in.

• Vertex shader
  • Clipmaps blending (LOD)
• Tessellation control shader
• Tessellation evaluation shader
  • Micropolygons (LOD)
  • Hard verticality (inject 2nd point)
  • Vertical tessellation (sediments?)
  • LOD0/LOD1 scheme (?)
  • Domain warping (?)
  • Grid adapts to intended geometry (?)
  • Heightmap onto manifold (?)
• Geometry shader
  • Replace polygon with model
  • Additional details
• Fragment shader
  • Procedural material
    • Mix mode
    • Repetition removal
    • Procedural gloss
    • Parallax mapping
    • Sub-pixel normal mapping
  • Direct light
    • Diffuse
    • Specular
  • Indirect light
    • Backlighting
    • Sky
    • Fresnel
  • Volumetric rendering
    • Atmospheric scattering
    • Shadows (LF)
    • Clouds
  • Edge antialiasing
• Control keys

• Ideas
  • C# CUDA alternatives
  • Scene node as list of CPU or GPU Tasks.
• - [ ] Just 1 function at a time
  • ECS-Scenegraph based?
    • C# version: Task based scenegraph
    • A scene is a graph where every node is a set of tasks
    • CUDA alternatives
      doc
    • Node types: camera, geometry, light, point
    • Is every node also a TransformNode ?
    • Are only leaf-nodes the ones containing visual stuff (gometry or imposter) ?
    • Is a node a camera node when its transform is a camera transform?
    • Would a camera node automatically get a window (or display) Rendering Context?
      • Node camera = AddNewNode()
      • camera.SetTransform( new CameraTransform() )
      • // Would its window closure imply the deactivation of the camera node?
      • while(camera.isActive)
• VS2008 solution
  • gdevice.dll
    • C API
    • Dry C++ implementation
    • Tiny
    • Slang
    • GLFW (for a mp window)
  • walker.exe (C++)
  • walkerC.exe
  • walkerCS.exe
  • walkerPy.exe
  • gcompiler.exe → GLSL binaries
  • C# tests ?
• VS2022 solution
  • gdevice.dll ?
  • walkerCS.exe
  • GLSL colorization for VS2022

• FIX hard edges in terrain generation
  • mind shadow consistency
• FIX current textures defects (paint)
• FIX tessellated and displaced normal
• FIX tessellated shadow aliasing?
• FIX get the detail color back in
• FIX tile repetition (iq example)
• FIX triplanar bug (with dFdx?)
• FIX tile repetition and triplanar bug?
• FIX tone mapping for sand or snow
• FIX aliasing on polygons edges
• FIX resizable window
• FIX fullscreen ⮂ windowed
• FIX terrain collisions
• FIX precompute away from Fragment
• FIX lighting defect in Fresnel

• Check GLSL types against this
• Modularity: demo.exe + gdevice.dll
• Implement ECS in Node
• Generate textures: example
• Remove asset/textures/terrain
• FIX make shader error system robust
• FIX compile error with Quadro T2000
• FIX compile error with RTX3000
• FIX shaders for Intel (?)

• Non uniform specular/fresnel
• Procedural gloss

• Documentation (GitHub Wiki)
• Journal (GitHub pages)
• Sub-projects
• Tutorials (GitHub pages + YouTube)

• FIX normal !!
  • Move dotN0L from FS to TES
  • FIX scale !!
  • FIX dH in FS (bumps)
• Antialiased tessellation
• Vertical tessellation
• Improve extrusion
• Hard verticality (inject 2nd point)
• Precompute more in TES
  • dotN0L (shadows)
  • distance

• Precompute before Fragment
• Precompute ambient dome?
• Avoid lfShadow in dome?

• Implement ECS in Node
• demo.exe + gdevice.dll
• Fix compile error with Quadro T2000
• Fix compile error with RTX3000

• FIX clamping discontinuities (those that generate hard shadow seams).
• FIX noise discontinuities (mostly visible on Intel).
• FIX texture discontinuties.

• F1: Wireframe+Tiles
• F2: Color
  • vertex color
  • texture generated
  • occlusion map
  • normal map
• F3-F4: Added detail
  • Tessellate
  • Bumps+Micro
• F5-F9: Light components
  • Diffuse
  • Specular
  • Backlighting
  • Sky
  • Fresnel
• F10-F12: Volumetrics
  • Light scattering
  • Shadow
  • Clouds
• P: PBR

• Static: use Z to fade vertically
• Volumetric: use plane intersections
• Wind-surface interaction (sand)

• Erosion
  • Stripe patterns
    • paper
  • Curl on steep: video
  • Gabor on steep
  • Dump
  • Rock
  • Shadow consistency
  • Flow map
• Artifacts
• Paths

• Make rocky chunks in mountains.
• FIX Peaks and sharp edges
  (with 2x2 filter and derivatives?)
• Add larger and smaller outcrops.
• More packed (pow?) and less packed.
• Cobs path on saddle points.
• Improve shadow consistency
• Rocky or pseudo metallic artifacts
• Additional erosion map
  • About converting to angle: atan
  • BinaryTreeSubdiv
  • w = peak factor [0..1]
  • erosion * peak
• Increase tessellation on verticalities
  • Displace like strata
• One master SCALE.

More things to try out:

• Hybrid<Max(triangular<Cones>)>
• Octave Derivative: dt = F(t1-t0)
• dt.z → clip spikes (by height)
• dt.xy → extra ridges (?)
• Quantization
• Triangular cones for extra ridges

Things that can be tried out:

• FIX triplanar with screen derivatives ?
• normal mapping for a triplanar shader
• Different methods (UDK, Unity..)
  • GpuGems3 method
• magic morphing cube
• Triplanar Mapping Test
• small planet
• Iq's biplanar
• method based on barycentric
• Fix normal interpolation when angle>90
• Display where this happens (?)
• Fix at generation level (?)

• Use asphalt detail at LOD0.
• Tweak smoothsteps: outcrops
• FIX get the detail color in.

• Smooth edges in triangular noise
• Spilling blue in the log
  (only Windows 11?)

• Erosion
  • Curl on steep: video
  • Gabor on steep
  • Dump
  • Rock
  • Flow map
• Artifacts
• Paths

More things to try out:

• Hybrid<Max(triangular<Cones>)>
• Octave Derivative: dt = F(t1-t0)
• dt.z → clip spikes (by height)
• dt.xy → extra ridges (?)
• Quantization
• Triangular cones for extra ridges

• Video teasers
• Write in game blogs

• Static: use Z to fade vertically
• Volumetric: use plane intersections
• Wind-surface interaction (sand)