Pipeline refactor

[petiaccja]

Refactors

DepthReduction + DepthReductionFinal + CSM: nobody else uses intermediate results of these nodes, merge them into a single node.

ForwardRender: waaaay too big and too many inputs, consolidate into fewer, more descriptive inputs. I.e. forward render could get shadow multiplier texture instead of all CSM bullshit. Consolidate CSM bullshit into one struct or one texture input, whichever easier. Make inputs optional: forward render should work without CSM & SS shadows. Pass through depth map, and make input depth prepass optional.

Voxelization: waaaaay to big, bloated, and breaks single responsibility. Break apart into Voxelization (produces voxels from scene, input: scene, camera; output: volume texture), VoxelGI (inputs: voxels, maybe scene, output: illumination voxel field or screen space texture), CombineLighting (inputs: gi texture, ssr texture, ssao texture, fw render out, etc.; output: proper lighting).

DofPrepare, DofTileMax, DofNeighborMax, DofMain: nobody else uses intermediate results (and ever will), merge them into a single node.

HDR:

• BloomDownsample: replace with generic downsample filter bank (input: texture, factor, repeatCount; output: vector of downsampled textures)
• LuminanceReduction & LuminanceReductionFinal: merge into one node (SceneLuminance)
• BloomBlur & BloomAdd filter bank: merge into one node (Bloom)
• LensFlare & BloomBlur & BloomBlur: merge into one node (LensFlare)
• HDRCombine: delete this node
• ToneMapper: inputs: hdr texture, parameters (i.e. luminance key); output: tone mapped image
• ToneMapper gets its hdr input texture by adding (bloom + lensFlare + normalImage) into one single texture

GetEnvVariable: nodes should NOT use GetEnvVariable to receive images and lookup tables from outside which can in no meaningful way be altered by the user. I.e. SMAA lookup tables can never be altered, they are part of the algorithm.

• SMAA
• HDRCombine (suspected)
• LensFlare (not an issue): lens flare texture is a valid use case, but should be optional
  Load textures from header files directly inside the node.

Debug draw

Debug draw must be implemented properly. I.e. graphics engine makes a scene available to all nodes, where they can put debug objects, and draws it automatically at the end of the frame. Current thing is a huge mess.

Methods

Code shared between different nodes
Factor such code out into its own class, and use that class inside multiple nodes.

[Yours3lf]

create node for visualizing voxel tex

[Yours3lf]

merge motion blur nodes
(motion blur, neighbormax, tilemax)