Finishing Indirect Diffuse Sampling — Handmade Hero — Episode Guide

0:02Mention the 'Handmade Collectives Worldwide" thread in the handmade.network forums¹^,2^,3

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0:02Mention the 'Handmade Collectives Worldwide" thread in the handmade.network forums¹^,2^,3

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0:02Mention the 'Handmade Collectives Worldwide" thread in the handmade.network forums¹^,2^,3

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3:44Fix typo in CompileZBiasProgram()

5:17Show our current specular indirect-bounce lighting

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5:17Show our current specular indirect-bounce lighting

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5:17Show our current specular indirect-bounce lighting

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6:14Embark on the switch to looking up into the diffuse light atlas, guided by the removal of light_voxel_cell from lighting_solution

6:56Consider relieving the lighting system of keeping stale data around

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6:56Consider relieving the lighting system of keeping stale data around

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6:56Consider relieving the lighting system of keeping stale data around

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8:36Respecify light_voxel_cell as light_atlas_tile

9:57Update LookUpVoxelClamped() to use the light_atlas_tile, rename it to GetTileClamped(), and introduce GetTileRowStride()

14:01Augment light_atlas with a TileRowStride for MakeLightAtlas() to set and LIGHT_ATLAS_OFFSET() to use

17:44Remove Stride from light_atlas_tile, rename its Base to Texel and update ComputeVoxelIrradianceAt() to sample from the DiffuseAtlas as a light_atlas_tile

24:13Set up ComputeVoxelIrradianceAt() to sample based on the surface reflection direction

26:04Update UpdateVoxel() to use our light_atlas_tile, respecifying the latter as light_atlas_texel containing a Value, introducing OffsetFromTexel()

30:28Update TestCast(), TestSphere(), FullCast() and ComputeLightPropagationWork() to use our light_atlas_texel

34:08Update ComputeLightPropagationWork() to blur from the SpecAtlas to the DiffuseAtlas, introducing a version of OffsetFromTexel() that takes a Tx and Ty

39:23Respecify BlockCopyVoxel() as BlockCopyAtlas()

44:41Introduce CopyTile(), a light_atlas_texel version of AdvanceRow(), and ZeroTile()

49:56Update BeginLightingComputation() to use BlockCopyAtlas() on both atlases

50:40Consider adding assertions in our new code to aid testing

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50:40Consider adding assertions in our new code to aid testing

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50:40Consider adding assertions in our new code to aid testing

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51:23Hit a read access violation in FillLightAtlasBorder()

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51:23Hit a read access violation in FillLightAtlasBorder()

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51:23Hit a read access violation in FillLightAtlasBorder()

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52:05Run in debug mode without crashing

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52:05Run in debug mode without crashing

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52:05Run in debug mode without crashing

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52:49Hit a read access violation in FillLightAtlasBorder() in release mode

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52:49Hit a read access violation in FillLightAtlasBorder() in release mode

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52:49Hit a read access violation in FillLightAtlasBorder() in release mode

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53:27Introduce GetTileUnclamped() to CopyTile() and ZeroTile() to use, asserting that we are looking up within the bounds of the atlas

56:04somebody_took_my_name It's all just moving memory around

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56:04somebody_took_my_name It's all just moving memory around

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56:04somebody_took_my_name It's all just moving memory around

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56:26Fix compile error

56:31Hit a read access violation in ComputeLightPropagationWork(), and determine to hunt for classes of bugs

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56:31Hit a read access violation in ComputeLightPropagationWork(), and determine to hunt for classes of bugs

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56:31Hit a read access violation in ComputeLightPropagationWork(), and determine to hunt for classes of bugs

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57:32Assert in GetTileUnclamped() that Tx and Ty are in bounds, and there and also in OffsetFromTexel() and AdvanceRow() that the resulting pointer is in bounds, introducing PointerIsInBounds()

1:01:42Hit our PointerIsInBounds() assertion in GetTileUnclamped()

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1:01:42Hit our PointerIsInBounds() assertion in GetTileUnclamped()

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1:01:42Hit our PointerIsInBounds() assertion in GetTileUnclamped()

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1:02:24Remove the LIGHT_LARGE_VOXEL_DIM definitions from lighting_solution, and propagate this change

1:05:05Embark on updating BeginLightingComputation() to place our hot voxel, removing LIGHT_CHUNK_COUNT, augmenting lighting_solution with LightingEnabled and turning off the lighting for now

1:08:28See no lighting

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1:08:28See no lighting

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1:08:28See no lighting

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1:08:58Disable the lighting in CompileZBiasProgram()

1:09:08See the orphanage with no lighting, hop to the neighbouring room and hit our PointerIsInBounds() assertion in GetTileUnclamped()

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1:09:08See the orphanage with no lighting, hop to the neighbouring room and hit our PointerIsInBounds() assertion in GetTileUnclamped()

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1:09:08See the orphanage with no lighting, hop to the neighbouring room and hit our PointerIsInBounds() assertion in GetTileUnclamped()

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1:10:17Run in debug mode to investigate our PointerIsInBounds() assertion hit in GetTileUnclamped()

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1:10:17Run in debug mode to investigate our PointerIsInBounds() assertion hit in GetTileUnclamped()

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1:10:17Run in debug mode to investigate our PointerIsInBounds() assertion hit in GetTileUnclamped()

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1:11:13Fix PointerIsInBounds() to find the atlas extents using GetLightAtlasSize()

1:11:36Hit our PointerIsInBounds() assertion in AdvanceRow(), called by ZeroTile()

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1:11:36Hit our PointerIsInBounds() assertion in AdvanceRow(), called by ZeroTile()

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1:11:36Hit our PointerIsInBounds() assertion in AdvanceRow(), called by ZeroTile()

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1:12:59Remove the PointerIsInBounds() assertion from AdvanceRow(), instead asserting the same within CopyTile() and ZeroTile()

1:14:04Hit no assertions in the light_atlas_tile code

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1:14:04Hit no assertions in the light_atlas_tile code

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1:14:04Hit no assertions in the light_atlas_tile code

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1:14:25Make BeginLightingComputation() draw the voxels

1:15:13Hit an assertion in GetTileUnclamped(), called by BlockCopyAtlas() within BeginLightingComputation()

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1:15:13Hit an assertion in GetTileUnclamped(), called by BlockCopyAtlas() within BeginLightingComputation()

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1:15:13Hit an assertion in GetTileUnclamped(), called by BlockCopyAtlas() within BeginLightingComputation()

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1:22:05Fix BlockCopyAtlas() to correctly operate within bounds

1:25:12Run without hitting any assertions in GetTileUnclamped(), with a few words on paranoid bounds checking

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1:25:12Run without hitting any assertions in GetTileUnclamped(), with a few words on paranoid bounds checking

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1:25:12Run without hitting any assertions in GetTileUnclamped(), with a few words on paranoid bounds checking

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1:26:42Check out the unexpectedly large and correctly centred lighting voxel

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1:26:42Check out the unexpectedly large and correctly centred lighting voxel

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1:26:42Check out the unexpectedly large and correctly centred lighting voxel

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1:27:30Re-enable the lighting in BeginLightingComputation()

1:27:38Double-check the lighting distribution code in EndLightingComputation()

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1:27:38Double-check the lighting distribution code in EndLightingComputation()

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1:27:38Double-check the lighting distribution code in EndLightingComputation()

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1:27:56Run in debug mode without hitting any assertions

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1:27:56Run in debug mode without hitting any assertions

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1:27:56Run in debug mode without hitting any assertions

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1:28:23Run in release mode and hit a read access violation in ComputeLightPropagationWork()

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1:28:23Run in release mode and hit a read access violation in ComputeLightPropagationWork()

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1:28:23Run in release mode and hit a read access violation in ComputeLightPropagationWork()

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1:29:58Toggle off the specular–diffuse atlas blurring code in ComputeLightPropagationWork()

1:30:14Run successfully in release mode

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1:30:14Run successfully in release mode

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1:30:14Run successfully in release mode

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1:30:54Toggle on the specular–diffuse atlas blurring code in ComputeLightPropagationWork()

1:31:08Consider removing LIGHT_ATLAS_OFFSET()

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1:31:08Consider removing LIGHT_ATLAS_OFFSET()

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1:31:08Consider removing LIGHT_ATLAS_OFFSET()

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1:32:03Scour for bugs the specular–diffuse atlas blurring code in ComputeLightPropagationWork()

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1:32:03Scour for bugs the specular–diffuse atlas blurring code in ComputeLightPropagationWork()

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1:32:03Scour for bugs the specular–diffuse atlas blurring code in ComputeLightPropagationWork()

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1:34:51Toggle off the store calls in ComputeLightPropagationWork()

1:35:11Break on the final Transpose() call in ComputeLightPropagationWork() and check the asm to ensure the blurring loop has not been optimised out

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1:35:11Break on the final Transpose() call in ComputeLightPropagationWork() and check the asm to ensure the blurring loop has not been optimised out

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1:35:11Break on the final Transpose() call in ComputeLightPropagationWork() and check the asm to ensure the blurring loop has not been optimised out

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1:35:50Continue to run without storing, but also without crashing

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1:35:50Continue to run without storing, but also without crashing

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1:35:50Continue to run without storing, but also without crashing

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1:36:05Fix ComputeLightPropagationWork() to use the DiffuseTexel.Value pointer itself, rather than its address

1:36:38Run successfully with the specular–diffuse blurring and bouncing

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1:36:38Run successfully with the specular–diffuse blurring and bouncing

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1:36:38Run successfully with the specular–diffuse blurring and bouncing

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1:37:01Re-enable the lighting in CompileZBiasProgram()

1:37:20Admire our diffuse lighting

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1:37:20Admire our diffuse lighting

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1:37:20Admire our diffuse lighting

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1:38:33Try hard-setting the SampleRefColor to 70% in FullCast()

1:39:41See the light brighten and brighten

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1:39:41See the light brighten and brighten

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1:39:41See the light brighten and brighten

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1:40:04Try decreasing the SampleRefColor from 70% to 25% in FullCast()

1:40:15See the light's brightness remain stable

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1:40:15See the light's brightness remain stable

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1:40:15See the light's brightness remain stable

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1:40:30Try increasing the SampleRefColor from 25% to 50% in FullCast()

1:40:35Hit a write access violation in the debug arena

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1:40:35Hit a write access violation in the debug arena

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1:40:35Hit a write access violation in the debug arena

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1:40:51Admire our diffuse lighting

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1:40:51Admire our diffuse lighting

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1:40:51Admire our diffuse lighting

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1:41:06Remove the commented out reflectance code from ComputeVoxelIrradianceAt(), and the SampleRefColor hard-setting from FullCast()

1:42:19Try modifying the W by ×0.25 in BuildDiffuseLightMaps()

1:43:09See our lighting bounce less

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1:43:09See our lighting bounce less

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1:43:09See our lighting bounce less

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1:43:17Try increasing the W modification from ×0.25 to ×0.5 in BuildDiffuseLightMaps()

1:43:19Hit a write access violation in DEBUGGetArena()

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1:43:19Hit a write access violation in DEBUGGetArena()

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1:43:19Hit a write access violation in DEBUGGetArena()

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1:43:42Check out our ×0.5 bounced lighting

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1:43:42Check out our ×0.5 bounced lighting

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1:43:42Check out our ×0.5 bounced lighting

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1:44:01Try increasing the W modification from ×0.5 to ×0.75 in BuildDiffuseLightMaps()

1:44:03Check out our more correct ×0.75 bounced lighting

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1:44:03Check out our more correct ×0.75 bounced lighting

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1:44:03Check out our more correct ×0.75 bounced lighting

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1:45:29Try increasing the W modification from ×0.75 to ×0.85 in BuildDiffuseLightMaps()

1:45:38Check out our ×0.85 bounced lighting, with the determination to tighten our lighting equation

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1:45:38Check out our ×0.85 bounced lighting, with the determination to tighten our lighting equation

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1:45:38Check out our ×0.85 bounced lighting, with the determination to tighten our lighting equation

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1:46:54Try increasing the W modification from ×0.85 to ×0.9 in BuildDiffuseLightMaps()

1:46:56Check out our ×0.9 bounced lighting

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1:46:56Check out our ×0.9 bounced lighting

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1:46:56Check out our ×0.9 bounced lighting

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1:47:39Try increasing the W modification from ×0.9 to ×0.95 in BuildDiffuseLightMaps()

1:47:43Check out our still stable ×0.95 bounced lighting

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1:47:43Check out our still stable ×0.95 bounced lighting

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1:47:43Check out our still stable ×0.95 bounced lighting

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1:48:58Remove the W modification from BuldDiffuseLightMaps()

1:49:07Check out our (slowly destabilising) bounced lighting

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1:49:07Check out our (slowly destabilising) bounced lighting

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1:49:07Check out our (slowly destabilising) bounced lighting

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1:49:54Q&A

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1:49:54Q&A

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1:49:54Q&A

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1:50:30picklebobdogflog Q: What is the cause of the flickering in the lighting? Will you do some de-noising or cast more rays in the future to try to fix it?

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1:50:30picklebobdogflog Q: What is the cause of the flickering in the lighting? Will you do some de-noising or cast more rays in the future to try to fix it?

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1:50:30picklebobdogflog Q: What is the cause of the flickering in the lighting? Will you do some de-noising or cast more rays in the future to try to fix it?

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1:50:54Try modifying the W by ×0.975 in BuildDiffuseLightMaps()

1:52:17somebody_took_my_name Q: I think you might have flipped the tx / /ty in TestSphere() while rewriting the code

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1:52:17somebody_took_my_name Q: I think you might have flipped the tx / /ty in TestSphere() while rewriting the code

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1:52:17somebody_took_my_name Q: I think you might have flipped the tx / /ty in TestSphere() while rewriting the code

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1:52:33xxthebigfoxx Q: Could it be useful to have it print a value like the average texel color of the diffuse and / or specular maps on the screen?

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1:52:33xxthebigfoxx Q: Could it be useful to have it print a value like the average texel color of the diffuse and / or specular maps on the screen?

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1:52:33xxthebigfoxx Q: Could it be useful to have it print a value like the average texel color of the diffuse and / or specular maps on the screen?

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1:53:05vaualbus Q: Are you using different level on assert also for release build? Or you only use asserts on debug builds?

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1:53:05vaualbus Q: Are you using different level on assert also for release build? Or you only use asserts on debug builds?

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1:53:05vaualbus Q: Are you using different level on assert also for release build? Or you only use asserts on debug builds?

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1:53:10Disable HANDMADE_INTERNAL and HANDMADE_SLOW in build.bat

1:53:24Hit a read access violation in OpenGLEndFrame(), and identifier not found compile errors

1:53:46Make HANDMADE_INTERNAL define the macros that HANDMADE_SLOW – within HANDMADE_INTERNAL – would have been able to define

1:55:24Run with both HANDMADE_INTERNAL and HANDMADE_SLOW disabled, but asserts enabled

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1:55:24Run with both HANDMADE_INTERNAL and HANDMADE_SLOW disabled, but asserts enabled

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1:55:24Run with both HANDMADE_INTERNAL and HANDMADE_SLOW disabled, but asserts enabled

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1:56:53yesyesyourmother Can't find anything with DuckDuckGo⁴

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1:56:53yesyesyourmother Can't find anything with DuckDuckGo⁴

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1:56:53yesyesyourmother Can't find anything with DuckDuckGo⁴

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1:57:27sahfortv Q: How slow are we? Is there any significant change in speed from the changes today?

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1:57:27sahfortv Q: How slow are we? Is there any significant change in speed from the changes today?

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1:57:27sahfortv Q: How slow are we? Is there any significant change in speed from the changes today?

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1:57:30Check out the performance of our lighting

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1:57:30Check out the performance of our lighting

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1:57:30Check out the performance of our lighting

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2:01:06sahfortv Q: And was the goal is to get to 30FPS in debug mode?

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2:01:06sahfortv Q: And was the goal is to get to 30FPS in debug mode?

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2:01:06sahfortv Q: And was the goal is to get to 30FPS in debug mode?

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2:01:16vaualbus Q: So we are faster than the previous solution? I don't remember the performance of the old system

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2:01:16vaualbus Q: So we are faster than the previous solution? I don't remember the performance of the old system

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2:01:16vaualbus Q: So we are faster than the previous solution? I don't remember the performance of the old system

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2:01:48Consider removing all mentions of LIGHT_LOOKUP_VOXEL_DIM

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2:01:48Consider removing all mentions of LIGHT_LOOKUP_VOXEL_DIM

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2:01:48Consider removing all mentions of LIGHT_LOOKUP_VOXEL_DIM

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2:02:49Temporarily reduce LIGHT_LOOKUP_VOXEL_DIM_POW_2 from 5 to 4

2:02:59Admire our much faster lighting

2:03:42Revert our LIGHT_LOOKUP_VOXEL_DIM_POW_2 to 5

2:04:09mattiamanzati Q: Can you still parameterise the voxel size? I'm curious if decreasing voxel size will remove some cubeness

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2:04:09mattiamanzati Q: Can you still parameterise the voxel size? I'm curious if decreasing voxel size will remove some cubeness

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2:04:09mattiamanzati Q: Can you still parameterise the voxel size? I'm curious if decreasing voxel size will remove some cubeness

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2:04:42pragmascrypt Q: For what are you still using voxels?

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2:04:42pragmascrypt Q: For what are you still using voxels?

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2:04:42pragmascrypt Q: For what are you still using voxels?

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2:05:40data_pi Q: Off-topic: Do you see Rust replacing C / C++ in the game industry in the next 5–10 years?

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2:05:40data_pi Q: Off-topic: Do you see Rust replacing C / C++ in the game industry in the next 5–10 years?

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2:05:40data_pi Q: Off-topic: Do you see Rust replacing C / C++ in the game industry in the next 5–10 years?

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2:11:05ravarix Interesting that you think Rust doesn't help with swizzling. There are many libs for it just like C. It's not really a language problem

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2:11:05ravarix Interesting that you think Rust doesn't help with swizzling. There are many libs for it just like C. It's not really a language problem

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2:11:05ravarix Interesting that you think Rust doesn't help with swizzling. There are many libs for it just like C. It's not really a language problem

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2:12:03s0imn Q: Are there any language features in C++ (that is not borrowed from C) that you like, and are there other language features than metaprogramming, that you want in a new language?

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2:12:03s0imn Q: Are there any language features in C++ (that is not borrowed from C) that you like, and are there other language features than metaprogramming, that you want in a new language?

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2:12:03s0imn Q: Are there any language features in C++ (that is not borrowed from C) that you like, and are there other language features than metaprogramming, that you want in a new language?

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2:13:39ravarix Have you looked at the macro power of Rust? You can manipulate the AST as desired

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2:13:39ravarix Have you looked at the macro power of Rust? You can manipulate the AST as desired

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2:13:39ravarix Have you looked at the macro power of Rust? You can manipulate the AST as desired

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2:14:02etheraxx Functional languages like Haskell allow developing embedded DSLs and you can write compiler extensions to do symbol replacement

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2:14:02etheraxx Functional languages like Haskell allow developing embedded DSLs and you can write compiler extensions to do symbol replacement

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2:14:02etheraxx Functional languages like Haskell allow developing embedded DSLs and you can write compiler extensions to do symbol replacement

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2:16:22fierydrake Procedural Macros?⁵

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2:16:22fierydrake Procedural Macros?⁵

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2:16:22fierydrake Procedural Macros?⁵

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2:17:46ravarix handmade_hero Oh sorry, I wasn't asking for specific detail. I was just curious if you had looked at it at all

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2:17:46ravarix handmade_hero Oh sorry, I wasn't asking for specific detail. I was just curious if you had looked at it at all

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2:17:46ravarix handmade_hero Oh sorry, I wasn't asking for specific detail. I was just curious if you had looked at it at all

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2:18:49maliusarth Q: Where can I find Moustache?

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2:18:49maliusarth Q: Where can I find Moustache?

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2:18:49maliusarth Q: Where can I find Moustache?

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2:19:01maliusarth Q: What do you think of clang tooling to create such AST manipulation tools as part of the build pipeline?

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2:19:01maliusarth Q: What do you think of clang tooling to create such AST manipulation tools as part of the build pipeline?

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2:19:01maliusarth Q: What do you think of clang tooling to create such AST manipulation tools as part of the build pipeline?

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2:19:29Wrap this up

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2:19:29Wrap this up

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2:19:29Wrap this up

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