Removing Lighting Walk Tables — Handmade Hero — Episode Guide

0:02Recap and set the stage for the day debugging lighting

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0:02Recap and set the stage for the day debugging lighting

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0:02Recap and set the stage for the day debugging lighting

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1:03Demo our light bleed bug

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1:03Demo our light bleed bug

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1:03Demo our light bleed bug

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1:45Demo our light copying bug

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1:45Demo our light copying bug

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1:45Demo our light copying bug

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6:00Describe BlockCopyAtlas()

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6:00Describe BlockCopyAtlas()

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6:00Describe BlockCopyAtlas()

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7:09Assert in BlockCopyAtlas() that the Z loop doesn't happen

7:50Hit our Z loop assertion in BlockCopyAtlas()

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7:50Hit our Z loop assertion in BlockCopyAtlas()

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7:50Hit our Z loop assertion in BlockCopyAtlas()

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8:49Move our Z loop assertion in BlockCopyAtlas() down to the Z clearing loop

9:11Hit our Z clearing loop assertion in BlockCopyAtlas()

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9:11Hit our Z clearing loop assertion in BlockCopyAtlas()

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9:11Hit our Z clearing loop assertion in BlockCopyAtlas()

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9:45Inspect the BlockCopyAtlas() values in an -Od build

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9:45Inspect the BlockCopyAtlas() values in an -Od build

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9:45Inspect the BlockCopyAtlas() values in an -Od build

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11:26Comment out the Z clearing loop in BlockCopyAtlas()

11:51Try to eyeball our light copying bug

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11:51Try to eyeball our light copying bug

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11:51Try to eyeball our light copying bug

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12:14Toggle off DebugDrawSpatialGrid() in UpdateLighting()

12:44Our light copying / flashing bug seems to still occur

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12:44Our light copying / flashing bug seems to still occur

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12:44Our light copying / flashing bug seems to still occur

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14:47Uncomment the Z clearing loop in BlockCopyAtlas()

15:14Scour BlockCopyAtlas() for bugs

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15:14Scour BlockCopyAtlas() for bugs

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15:14Scour BlockCopyAtlas() for bugs

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18:07Remove the minus 1 from the StopZ computation in BlockCopyAtlas()

18:35We still see a little bit of flashing

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18:35We still see a little bit of flashing

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18:35We still see a little bit of flashing

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18:54Enable LIGHT_ATLAS_ASSERT

19:25Immediately trap on VALIDATE_TEXEL_ATLAS() of the SpecAtlas

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19:25Immediately trap on VALIDATE_TEXEL_ATLAS() of the SpecAtlas

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19:25Immediately trap on VALIDATE_TEXEL_ATLAS() of the SpecAtlas

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19:35Toggle off the VALIDATE_TEXEL_ATLAS() calls in UpdateLighting()

19:47Trap on VALIDATE_TEXEL_ATLAS() in BlockCopyAtlas()

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19:47Trap on VALIDATE_TEXEL_ATLAS() in BlockCopyAtlas()

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19:47Trap on VALIDATE_TEXEL_ATLAS() in BlockCopyAtlas()

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19:54Toggle off the VALIDATE_TEXEL_ATLAS() calls using #if TEMPORARY

20:19Trap on VALIDATE_TEXEL_ATLAS() at the end of BlockCopyAtlas()

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20:19Trap on VALIDATE_TEXEL_ATLAS() at the end of BlockCopyAtlas()

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20:19Trap on VALIDATE_TEXEL_ATLAS() at the end of BlockCopyAtlas()

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20:29Toggle off the final VALIDATE_TEXEL_ATLAS() call using #if TEMPORARY

20:43Successfully run without fetching out of bounds

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20:43Successfully run without fetching out of bounds

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20:43Successfully run without fetching out of bounds

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21:02Remove the minus 1 from the StopX and StopY computations in BlockCopyAtlas()

21:22We have lighting movement across tiles

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21:22We have lighting movement across tiles

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21:22We have lighting movement across tiles

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23:25Decrease tUpdateBlend from 1 to 15/60 in UpdateLighting()

23:49Still see the lighting shift

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23:49Still see the lighting shift

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23:49Still see the lighting shift

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24:13Decrease tUpdateBlend from 15/60 to 1/60 in UpdateLighting()

24:29The shift is due to the light being recomputed differently

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24:29The shift is due to the light being recomputed differently

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24:29The shift is due to the light being recomputed differently

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25:22Toggle off the -1 to 1 origin cube in UpdateAndRenderWorld()

26:59The wall tiles darken after shifting

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26:59The wall tiles darken after shifting

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26:59The wall tiles darken after shifting

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28:07Toggle off PushLight() on the DebugLightP in UpdateAndRenderWorld()

28:26The room still seems to brighten when we enter

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28:26The room still seems to brighten when we enter

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28:26The room still seems to brighten when we enter

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30:18The light bleed takes longer with our slower tUpdateBlend

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30:18The light bleed takes longer with our slower tUpdateBlend

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30:18The light bleed takes longer with our slower tUpdateBlend

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31:01Increase tUpdateBlend from 1/60 to 1 in UpdateLighting()

31:50The copy is now fine, but the ray casting differs when shifting the lighting voxel

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31:50The copy is now fine, but the ray casting differs when shifting the lighting voxel

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31:50The copy is now fine, but the ray casting differs when shifting the lighting voxel

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34:12Prevent UpdateLighting() from offsetting VoxCameraOffset.Y by 2

35:03The lighting region is now centred

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35:03The lighting region is now centred

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35:03The lighting region is now centred

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36:38Scour GridRayCast() for a reason for differences when shifting the lighting voxel

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36:38Scour GridRayCast() for a reason for differences when shifting the lighting voxel

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36:38Scour GridRayCast() for a reason for differences when shifting the lighting voxel

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41:16Scour ComputeWalkTable() for bugs

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41:16Scour ComputeWalkTable() for bugs

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41:16Scour ComputeWalkTable() for bugs

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42:40Make WalkTableOffset be an array of 4 in sample_direction, for ComputeWalkTable() to use

43:12The light doesn't seem to have changed

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43:12The light doesn't seem to have changed

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43:12The light doesn't seem to have changed

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43:58Double-check ComputeWalkTable() for correctness

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43:58Double-check ComputeWalkTable() for correctness

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43:58Double-check ComputeWalkTable() for correctness

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45:16Consider removing lighting walk tables

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45:16Consider removing lighting walk tables

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45:16Consider removing lighting walk tables

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46:56The ray casting still differs when shifting the lighting voxel

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46:56The ray casting still differs when shifting the lighting voxel

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46:56The ray casting still differs when shifting the lighting voxel

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47:27Consider making UpdateLighting() force dVoxel to be a multiple of 2 so the quadrant doesn't change

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47:27Consider making UpdateLighting() force dVoxel to be a multiple of 2 so the quadrant doesn't change

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47:27Consider making UpdateLighting() force dVoxel to be a multiple of 2 so the quadrant doesn't change

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48:32gir33 The problem changed, though, there's still a dark spot but it doesn't move now

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48:32gir33 The problem changed, though, there's still a dark spot but it doesn't move now

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48:32gir33 The problem changed, though, there's still a dark spot but it doesn't move now

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48:51Demo the moving dark spot

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48:51Demo the moving dark spot

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48:51Demo the moving dark spot

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49:46gir33 I mean it seems like it only moved when leaving the room but not while moving within the room as before, no?

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49:46gir33 I mean it seems like it only moved when leaving the room but not while moving within the room as before, no?

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49:46gir33 I mean it seems like it only moved when leaving the room but not while moving within the room as before, no?

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50:07Demo the changing dark spot when the lighting voxel alignment changes within a room

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50:07Demo the changing dark spot when the lighting voxel alignment changes within a room

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50:07Demo the changing dark spot when the lighting voxel alignment changes within a room

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50:59Consider removing lighting walk tables

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50:59Consider removing lighting walk tables

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50:59Consider removing lighting walk tables

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55:15mallesbixie FruFru is a great variable name, though

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55:15mallesbixie FruFru is a great variable name, though

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55:15mallesbixie FruFru is a great variable name, though

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55:20Consider removing lighting walk tables

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55:20Consider removing lighting walk tables

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55:20Consider removing lighting walk tables

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56:18Check GridRayCast() to inform our lighting walk table removal decision

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56:18Check GridRayCast() to inform our lighting walk table removal decision

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56:18Check GridRayCast() to inform our lighting walk table removal decision

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59:50Toggle on WalkTable stepping in GridRayCast()

1:00:06Traverse the orphanage into a relatively stably lit room

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1:00:06Traverse the orphanage into a relatively stably lit room

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1:00:06Traverse the orphanage into a relatively stably lit room

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1:00:17Change the CostMetric-based ray casting loop in GridRayCast() to iterate over a hard-bounded GridWalkIteration

1:00:47The lighting looks the same

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1:00:47The lighting looks the same

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1:00:47The lighting looks the same

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1:00:56Remove CostMetric entirely from GridRayCast()

1:01:23The lighting remains fine

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1:01:23The lighting remains fine

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1:01:23The lighting remains fine

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1:01:46Consider formulating an exit criterion in GridRayCast() upon leaving the spatial partition

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1:01:46Consider formulating an exit criterion in GridRayCast() upon leaving the spatial partition

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1:01:46Consider formulating an exit criterion in GridRayCast() upon leaving the spatial partition

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1:04:29Determine to make GridRayCast() work without a walk table

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1:04:29Determine to make GridRayCast() work without a walk table

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1:04:29Determine to make GridRayCast() work without a walk table

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1:09:25Sketch out walk table-eliminated grid stepping in GridRayCast()

1:45:42spacenaming DirCurP is 2*DirCurP+dX/Y at the moment

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1:45:42spacenaming DirCurP is 2*DirCurP+dX/Y at the moment

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1:45:42spacenaming DirCurP is 2*DirCurP+dX/Y at the moment

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1:46:06spacenaming XStepV have it included already

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1:46:06spacenaming XStepV have it included already

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1:46:06spacenaming XStepV have it included already

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1:46:35Determine to remove lighting walk tables

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1:46:35Determine to remove lighting walk tables

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1:46:35Determine to remove lighting walk tables

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1:47:31Break

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1:47:31Break

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1:47:31Break

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1:48:10afk

1:50:06Return and centre the camera

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1:50:06Return and centre the camera

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1:50:06Return and centre the camera

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1:52:25Implement on-the-fly grid stepping in GridRayCast()

2:13:50Hit an overflow read access violation on SpatialGridLeaves in GridRayCast()

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2:13:50Hit an overflow read access violation on SpatialGridLeaves in GridRayCast()

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2:13:50Hit an overflow read access violation on SpatialGridLeaves in GridRayCast()

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2:14:03Introduce a CheckGridIndex to separate out the two grid stepping routines in GridRayCast()

2:14:46The lighting behaves the same as before

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2:14:46The lighting behaves the same as before

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2:14:46The lighting behaves the same as before

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2:15:11Break in to GridRayCast() and compare the values of the two grid stepping routines

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2:15:11Break in to GridRayCast() and compare the values of the two grid stepping routines

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2:15:11Break in to GridRayCast() and compare the values of the two grid stepping routines

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2:16:33Fix the dGridIndexXBase and dGridIndexYBase computations in GridRayCast()

2:16:51Break in to GridRayCast() and compare the values of the two grid stepping routines

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2:16:51Break in to GridRayCast() and compare the values of the two grid stepping routines

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2:16:51Break in to GridRayCast() and compare the values of the two grid stepping routines

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2:17:51Assert in GridRayCast() that GridIndex and CheckGridIndex match

2:18:14Run the game

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2:18:14Run the game

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2:18:14Run the game

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2:18:24Update remedybg from 0.3.5.0 to 0.3.6.4

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2:18:24Update remedybg from 0.3.5.0 to 0.3.6.4

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2:18:24Update remedybg from 0.3.5.0 to 0.3.6.4

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2:20:21Hit the GridIndex and CheckGridIndex matching assertion in GridRayCast()

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2:20:21Hit the GridIndex and CheckGridIndex matching assertion in GridRayCast()

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2:20:21Hit the GridIndex and CheckGridIndex matching assertion in GridRayCast()

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2:21:49Swap in the new on-the-fly grid stepping in GridRayCast()

2:22:49Our ray casting correctly no longer differs when shifting the lighting voxel

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2:22:49Our ray casting correctly no longer differs when shifting the lighting voxel

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2:22:49Our ray casting correctly no longer differs when shifting the lighting voxel

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2:24:19Consider how to update tTerminate

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2:24:19Consider how to update tTerminate

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2:24:19Consider how to update tTerminate

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2:29:46Make GridRayCast() compute tTerminate on the fly

2:38:43Our lighting happily looks no different

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2:38:43Our lighting happily looks no different

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2:38:43Our lighting happily looks no different

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2:39:08Remove the lighting walk tables

2:41:08Run successfully and briefly consider our remaining light bleed bug

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2:41:08Run successfully and briefly consider our remaining light bleed bug

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2:41:08Run successfully and briefly consider our remaining light bleed bug

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2:44:28Reflect on today's work and consider further simplifications

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2:44:28Reflect on today's work and consider further simplifications

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2:44:28Reflect on today's work and consider further simplifications

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2:45:35~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:45:35~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:45:35~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:46:43Make GridRayCast() only cast one ray

2:47:05~35% frame time (~35,000,000 cycles) on ComputeLightPropagationWork

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2:47:05~35% frame time (~35,000,000 cycles) on ComputeLightPropagationWork

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2:47:05~35% frame time (~35,000,000 cycles) on ComputeLightPropagationWork

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2:47:36Make GridRayCast() cast the full LIGHTING_OCTAHEDRAL_RAYS_PER_TEXEL

2:47:42~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:47:42~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:47:42~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:48:00Make GridRayCast() only cast no rays

2:48:08~11% frame time (~8,800,000 cycles) on ComputeLightPropagationWork

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2:48:08~11% frame time (~8,800,000 cycles) on ComputeLightPropagationWork

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2:48:08~11% frame time (~8,800,000 cycles) on ComputeLightPropagationWork

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2:48:24Make GridRayCast() cast the full LIGHTING_OCTAHEDRAL_RAYS_PER_TEXEL

2:48:27~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:48:27~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:48:27~82% frame time (~400,000,000 cycles) on ComputeLightPropagationWork

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2:48:58Make GridRayCast() cast half of the LIGHTING_OCTAHEDRAL_RAYS_PER_TEXEL

2:49:12Admire the cool red light bleed

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2:49:12Admire the cool red light bleed

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2:49:12Admire the cool red light bleed

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2:49:49Make GridRayCast() double the RayWeight to compensate for the halved number of rays

2:50:09Admire the apparently structured light bleed bug

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2:50:09Admire the apparently structured light bleed bug

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2:50:09Admire the apparently structured light bleed bug

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2:51:28Let GridRayCast() cast all the rays, at their appropriate weight

2:51:51Disable LIGHT_ATLAS_ASSERT

2:52:10~28ms frame time

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2:52:10~28ms frame time

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2:52:10~28ms frame time

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2:52:36Disable HANDMADE_SLOW

2:52:48~24ms frame time

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2:52:48~24ms frame time

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2:52:48~24ms frame time

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2:53:33That's it for today

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2:53:33That's it for today

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2:53:33That's it for today

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2:54:12gir33 Are the GPU shaders just lerping from the results that the CPU is doing?

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2:54:12gir33 Are the GPU shaders just lerping from the results that the CPU is doing?

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2:54:12gir33 Are the GPU shaders just lerping from the results that the CPU is doing?

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2:57:07gir33 Is that like a spherical harmonics encoding?

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2:57:07gir33 Is that like a spherical harmonics encoding?

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2:57:07gir33 Is that like a spherical harmonics encoding?

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3:01:02That's it for today, with a glimpse into the future and reflections on the engine

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3:01:02That's it for today, with a glimpse into the future and reflections on the engine

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3:01:02That's it for today, with a glimpse into the future and reflections on the engine

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3:02:42vaualbus Can Z be re-added in an easier way now that the system is easier?

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3:02:42vaualbus Can Z be re-added in an easier way now that the system is easier?

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3:02:42vaualbus Can Z be re-added in an easier way now that the system is easier?

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3:05:13That's it

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3:05:13That's it

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3:05:13That's it

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