Entity-based Lighting Storage — Handmade Hero — Episode Guide

0:07Recap and set the stage for the day, improving the runtime performance of the lighting

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0:07Recap and set the stage for the day, improving the runtime performance of the lighting

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0:07Recap and set the stage for the day, improving the runtime performance of the lighting

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0:56Run the game to show our whole world, only excepting the trees, lit

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0:56Run the game to show our whole world, only excepting the trees, lit

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0:56Run the game to show our whole world, only excepting the trees, lit

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4:43Consider the two ways of optimising the lighting solution to only process the necessary elements

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4:43Consider the two ways of optimising the lighting solution to only process the necessary elements

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4:43Consider the two ways of optimising the lighting solution to only process the necessary elements

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6:11Prevent PushCube() from pushing on elements outside the bounds of the lighting solution, using a new LightBounds in render_group

10:58Run the game and hit the assert in GetHashFromID()

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10:58Run the game and hit the assert in GetHashFromID()

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10:58Run the game and hit the assert in GetHashFromID()

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11:18Make PushCube() clear the first LightIndexStore

11:33Run the game to see no lighting on anything

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11:33Run the game to see no lighting on anything

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11:33Run the game to see no lighting on anything

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12:06Make EnableLighting() take a rectangle3 LightingBounds, and UpdateAndRenderWorld() pass the entire SimBounds to it

13:24Run the game to see the whole world lit

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13:24Run the game to see the whole world lit

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13:24Run the game to see the whole world lit

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13:49Introduce smaller LightBounds in UpdateAndRenderWorld() to pass to EnableLighting()

15:00Run the game to see a speed increase because some of the world is not participating in the lighting solution

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15:00Run the game to see a speed increase because some of the world is not participating in the lighting solution

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15:00Run the game to see a speed increase because some of the world is not participating in the lighting solution

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15:26Further shrink the LightBounds in UpdateAndRenderWorld()

15:38Run the game to see yet more speedup, but buggy behaviour with the light apparently wrapping

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15:38Run the game to see yet more speedup, but buggy behaviour with the light apparently wrapping

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15:38Run the game to see yet more speedup, but buggy behaviour with the light apparently wrapping

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20:01Consider how to visualise the lighting solution

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20:01Consider how to visualise the lighting solution

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20:01Consider how to visualise the lighting solution

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23:41Potential bugs - correctness and performance - in the lighting solution

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23:41Potential bugs - correctness and performance - in the lighting solution

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23:41Potential bugs - correctness and performance - in the lighting solution

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32:08Run the game and note the impossibility of diagnosing our lighting bug without visualising lighting elements

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32:08Run the game and note the impossibility of diagnosing our lighting bug without visualising lighting elements

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32:08Run the game and note the impossibility of diagnosing our lighting bug without visualising lighting elements

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34:58Read carefully through PushCube() for potential bugs

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34:58Read carefully through PushCube() for potential bugs

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34:58Read carefully through PushCube() for potential bugs

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36:14Determine to allocate lighting elements responsibly

38:02Introduce a free list for the lighting solution, replacing LightPointCount in game_render_commands with a u16 FirstFreeLightingChunk, adding NextFree to lighting_point and making PushCube() free and reuse light chunks

53:36Consider how to determine when an entity holding light indices no longer needs them

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53:36Consider how to determine when an entity holding light indices no longer needs them

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53:36Consider how to determine when an entity holding light indices no longer needs them

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54:24Add a LightPointUsed array to game_render_commands for PushCube() to store light point usage

55:53Implement FreeLightChunk() and LightChunkFrameSweep()

1:00:17Make WinMain() clear the lighting memory every frame before rendering, and fix compile errors

1:03:58Encounter the problem of handling lights scattered about the array, and avoiding processing stuff that doesn't exist

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1:03:58Encounter the problem of handling lights scattered about the array, and avoiding processing stuff that doesn't exist

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1:03:58Encounter the problem of handling lights scattered about the array, and avoiding processing stuff that doesn't exist

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1:10:37Replace Solution->PointCount with LIGHT_POINTS_PER_CHUNK in OutputLightingPoints() and OutputLightingTextures()

1:13:45Prevent LightingTest() from setting the PointCount, and make it copy the whole set of lighting indices

1:15:28Note that we are doing everything on an allocation basis

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1:15:28Note that we are doing everything on an allocation basis

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1:15:28Note that we are doing everything on an allocation basis

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1:16:05Make DefaultRenderCommands() take and initialise LightChunkUsed

1:17:25Note that LightChunkFrameSweep() skips Chunk 0 and builds the free list backwards

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1:17:25Note that LightChunkFrameSweep() skips Chunk 0 and builds the free list backwards

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1:17:25Note that LightChunkFrameSweep() skips Chunk 0 and builds the free list backwards

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1:19:44Replace Solution->PointCount with LIGHT_POINTS_PER_CHUNK in ComputeLightPropagation()

1:24:23Add u8 *LightChunkUsed to lighting_solution

1:25:03Run the game and hit the assert in FreeLightChunk()

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1:25:03Run the game and hit the assert in FreeLightChunk()

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1:25:03Run the game and hit the assert in FreeLightChunk()

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1:26:28Consider how to confirm which entity occupied a light chunk

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1:26:28Consider how to confirm which entity occupied a light chunk

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1:26:28Consider how to confirm which entity occupied a light chunk

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1:28:48Temporarily make PushCube() take a u32 EntityID

1:30:20Consider making entities store their previous lighting information, and use a hot list of regions rather than a free list

1:32:01Make PushCube() instead take a lighting_point *LightStore and u32 LightCount

1:34:29Add an array of lighting_point Points to the entity struct

1:37:40The problem of sharing lighting points between entities

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1:37:40The problem of sharing lighting points between entities

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1:37:40The problem of sharing lighting points between entities

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1:41:43Large sets of lighting points

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1:41:43Large sets of lighting points

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1:41:43Large sets of lighting points

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1:45:55Spatially merging lighting points

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1:45:55Spatially merging lighting points

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1:45:55Spatially merging lighting points

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1:47:55Prevent PushCube() from taking LightCount and managing a free list

1:48:52Replace EmitC0 from game_render_commands with Emission in lighting_box, and add lighting_point *Storage to lighting_box

1:55:22Remove FreeLightChunk() and LightChunkFrameSweep()^α

1:55:55Restore PointCount to lighting_solution and move the light point generation code from PushCube() into LightingTest()

1:59:18Store full arrays rather than pointers in lighting_solution, and introduce lighting_point_state for lighting_box to store

2:01:47Make LightingTest() copy out the lighting solution per element

2:03:14Replace LastIsValid in lighting_solution with StorageContentsAreValid in lighting_box and propagate this change to LightingTest()

2:11:37Move the finalisation code from ComputeLightPropagation() to LightingTest()

2:13:08Consider a better way to solve the lighting across frames

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2:13:08Consider a better way to solve the lighting across frames

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2:13:08Consider a better way to solve the lighting across frames

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2:16:18Begin to enable LightingTest() to handle both cases of storage contents validity

2:18:39Consider packing the lighting data tighter

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2:18:39Consider packing the lighting data tighter

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2:18:39Consider packing the lighting data tighter

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2:22:37Make LightingTest() use alternate storage if the storage contents are not valid, and prevent OutputLightingTextures() from looping over the chunks

2:26:05Finish enabling LightingTest() to blend the lighting if the storage contents are valid, and fix compile errors

2:37:25Remove StorageContentsAreValid from lighting_box and instead make LightingTest() check if the normal of the first lighting point is valid

2:39:34Run the game and crash in LightingTest()

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2:39:34Run the game and crash in LightingTest()

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2:39:34Run the game and crash in LightingTest()

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2:39:57Try to make LightingTest() correctly set the FirstPoint

2:40:29Run the game, crash in LightingTest() and inspect the values to find that Box->Storage is not valid

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2:40:29Run the game, crash in LightingTest() and inspect the values to find that Box->Storage is not valid

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2:40:29Run the game, crash in LightingTest() and inspect the values to find that Box->Storage is not valid

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2:41:36Assert in LightingTest() that LightPointIndex <= LIGHT_DATA_WIDTH, and temporarily try hard setting the LightStore->Direction to 1, 1, 1

2:42:14Run the game to determine that the pulling out, rather than pushing on, of boxes is the problem

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2:42:14Run the game to determine that the pulling out, rather than pushing on, of boxes is the problem

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2:42:14Run the game to determine that the pulling out, rather than pushing on, of boxes is the problem

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2:42:55Step in to LightingTest() and inspect the Solution->Boxes to find that they are all garbage

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2:42:55Step in to LightingTest() and inspect the Solution->Boxes to find that they are all garbage

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2:42:55Step in to LightingTest() and inspect the Solution->Boxes to find that they are all garbage

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2:43:29Make UpdateAndRenderWorld() run the lighting solution before EndSim()

2:44:19Run the game to see that the Boxes look valid, but that the LightBoxCount is greater than expected, and investigate why

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2:44:19Run the game to see that the Boxes look valid, but that the LightBoxCount is greater than expected, and investigate why

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2:44:19Run the game to see that the Boxes look valid, but that the LightBoxCount is greater than expected, and investigate why

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2:46:09Step in to LightingTest() and realise that it is erroneously operating on the new set of boxes

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2:46:09Step in to LightingTest() and realise that it is erroneously operating on the new set of boxes

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2:46:09Step in to LightingTest() and realise that it is erroneously operating on the new set of boxes

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2:46:46Make LightingTest() store and iterate over the OriginalBoxCount

2:47:04Run the game to see that we're at least running but totally wrong

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2:47:04Run the game to see that we're at least running but totally wrong

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2:47:04Run the game to see that we're at least running but totally wrong

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2:48:16Q&A

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2:48:16Q&A

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2:48:16Q&A

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2:49:58billdstrong Q: The 148 Mil was the number of cycles the lighting took

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2:49:58billdstrong Q: The 148 Mil was the number of cycles the lighting took

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2:49:58billdstrong Q: The 148 Mil was the number of cycles the lighting took

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2:50:18mallesbixie Q: Is this your usual design process, a bit ad hoc?

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2:50:18mallesbixie Q: Is this your usual design process, a bit ad hoc?

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2:50:18mallesbixie Q: Is this your usual design process, a bit ad hoc?

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2:52:14Wrap it up

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2:52:14Wrap it up

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2:52:14Wrap it up

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