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[video output=day618 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Analyzing the Diffuse Blur" vod_platform=youtube id=vwi-Tq0c64w annotator=Miblo]
[0:02][Recap and set the stage for the day][:speech]
[0:40][Demo the :lighting with different resolution spatial and lighting grids][:run]
[2:22][Determine to optimise the :lighting pipeline, and work on quality, smoothing out the rectilinear pattern and reducing flicker][:optimisation :run]
[5:02][Determine to compile at least the :lighting in clang, to gauge the :SIMD :performance][:run]
[6:50][How the :ABI works on Microsoft Windows, in terms of register use][:simd :speech]
[10:01][On the possible work getting the code to compile with clang, including its exploitation of undefined behaviour][:language :speech]
[13:46][hhlightprof total seconds elapsed: 4.221848][:lighting :performance :run]
[13:52][Determine to optimise the diffuse blur][:lighting :optimisation :research]
[14:31][Toggle off the diffuse blur in ComputeLightPropagationWork()][:lighting]
[14:50][hhlightprof total seconds elapsed: 3.233531][:lighting :performance :run]
[15:15][Briefly describe our diffuse blur in ComputeLightPropagationWork()][:lighting :research]
[15:59]["Seperable" Filters][:blackboard :dsp :filtering]
[18:55][Example filter: Linear blend][:blackboard :dsp :filtering]
[23:53][Example filter: Bilinear blend][:blackboard :dsp :filtering]
[27:20][Example seperable filter: two-pass, one-dimensional blends][:blackboard :dsp :filtering]
[29:16][Get some tissues][:admin]
[29:20][:afk]
[30:01][Return with tissues][:admin]
[30:20][Our current cosine-weighted falloff equation][:blackboard :dsp :filtering]
[35:47][Walk through UnitVectorFromOctahedral()][:lighting :research]
[37:38][Determine to print the weight map table][:filtering :lighting :research]
[39:11][Regular tea break][:admin]
[39:20][:afk]
[40:06][Return with the realisation that we're at risk of infringing [@naysayer88 Jon Blow]'s on-stream tea-making patent][:admin]
[40:27][Make ProfileRun() print the DiffuseWeightMap to stdout][:filtering :lighting]
[46:29][hhlightprof DiffuseWeightMap: Many 0s][:filtering :lighting :run]
[46:51][Reacquaint ourselves with the use of DiffuseWeightMap in ComputeLightPropagationWork][:filtering :lighting :research]
[48:46][Make ProfileRun() print out the DiffuseWeightMap, based on BuildDiffuseLightMaps()][:filtering :lighting]
[51:56][hhlightprof DiffuseWeightMap: Sensibly populated][:filtering :lighting :run]
[52:20][Make ProfileRun() print dashes when the Entry is 0][:filtering :lighting]
[52:49][hhlightprof DiffuseWeightMap: More visible shape][:filtering :lighting :run]
[53:10][Regular tea break][:admin]
[53:14][:afk]
[54:40][Return, with the tea now steeping][:admin]
[54:45][Analyse the DiffuseWeightMap printout for reused values][:filtering :lighting :research]
[58:43][Approaches to making the cosine falloff seperable: 1) Produce a somewhat similar, but regular pattern; 2) Classify values by their position][:filtering :lighting :research]
[59:32][There's the tea][:admin]
[59:37][:afk]
[1:00:17][Return and pour the tea][:admin]
[1:00:50][Try making ProfileRun() print out the DiffuseWeightMap 16×16, to see the shape when it wraps][:filtering :lighting]
[1:02:03][hhlightprof DiffuseWeightMap: 16×16 shapes, and identical rows between maps][:filtering :lighting :run]
[1:05:17][Consider changing the cosine falloff function to a basic blur][:filtering :lighting :research]
[1:06:28][Accidentally add a threshold of 0.01f to BuildDiffuseLightMaps()][:filtering :lighting]
[1:07:20][hhlightprof DiffuseWeightMap: Without threshold][:filtering :lighting :run]
[1:07:38][Add a threshold to the DiffuseWeightMap printout][:filtering :lighting]
[1:08:13][hhlightprof DiffuseWeightMap: Still without threshold][:filtering :lighting :run]
[1:08:24][Eyeball ProfileRun() for threshold bugs][:filtering :lighting :research]
[1:09:52][Step in to ProfileRun() and inspect W][:filtering :lighting :run]
[1:10:35][Fix the DiffuseWeightMap printout threshold in ProfileRun()][:filtering :lighting]
[1:11:25][hhlightprof DiffuseWeightMap: With threshold, blank columns][:filtering :lighting :run]
[1:13:45][Try various thresholds for the DiffuseWeightMap printout][:filtering :lighting :programming :run]
[1:14:54][Make ProfileRun() print out the DiffuseWeightMap 8×8][:filtering :lighting]
[1:15:05][hhlightprof DiffuseWeightMap: 8×8 shapes, with threshold][:filtering :lighting :run]
[1:15:47][Make ProfileRun() print out the X, Y and Z directions of a DiffuseWeightMap Element][:filtering :lighting]
[1:18:15][hhlightprof DiffuseWeightMap: Element directions][:filtering :lighting :run]
[1:18:42][Make ProfileRun() add a dash to its 0 printout][:filtering :lighting]
[1:18:56][hhlightprof DiffuseWeightMap: Element directions, completely symmetric][:filtering :lighting :run]
[1:22:35][Our cosine falloff equation, and its reusable terms][:blackboard :filtering :lighting]
[1:31:53][Rephrasing the DiffuseWeightMap generation in a seperable way][:blackboard :filtering :lighting]
[1:40:28][Determine to ruminate on the DiffuseWeightMap][:filtering :lighting :research]
[1:40:55][Q&A][:speech]
[1:41:35][@mindmark42][Q: Couldn't at least the tetrahedron unit vector function use a lookup table and lerp?][:lighting]
[1:42:38][@mindmark42][Q: Speed up that function, if it gets called a lot][:lighting :performance]
[1:43:47][Toggle on the diffuse blur in ComputeLightPropagationWork()][:lighting]
[1:43:52][Our desire to do the cosine falloff seperable, if we can][:lighting :filtering :research]
[1:45:21][Wrap it up][:speech]
[/video]