Adding an Ambient Occlusion Pass | Handmade Hero Episode Guide

0:01Recap and set the stage for the day

1:29Run the game to see the lighting diamonds

5:31handmade_render_group.cpp: Make LightingTest() correctly sum the Dest->FrontEmitC

5:55Run the game to see the correctly summed colours

6:08handmade_render_group.cpp: Make LightingTest() account for the DistanceFalloff

7:16Run the game with DistanceFalloff and summation, and consider our way forward

8:17handmade_render_group.cpp: Make LightingTest() set DiffuseInner to 1.0f

8:35Run the game to see the flickering

9:02Determine to introduce the ability to add light sources

12:27handmade_platform.h: Add Emission to the textured_vertex struct

14:11Run the game to see that nothing bad happens

14:30handmade_render_group.cpp: Make PushQuad() and LightingTest() set the emission

16:40Run the game to see everything unlit

16:47handmade_render_group.cpp: Introduce PushLight()

19:23handmade_world_mode.cpp: Make UpdateAndRenderWorld() call PushLight()

20:59Run the game and see a cube light that is not emitting any light

21:28handmade_render_group.cpp: Make PushQuad() take Emission

22:27Run the game to see our emitting light, with less flickering, but that the light itself is not lit up

24:55handmade_render_group.cpp: Add a BreakHere in LightingTest() for the light

25:58Step in to LightingTest() and inspect the values for the light

27:59handmade_render_group.cpp: Make LightingTest() correctly set the FrontEmit

28:35Run the game to see our lit light

29:18handmade_render_group.cpp: Make LightingTest() iterate three times

29:29Run the game to see our much brighter scene, now with flutter

30:03handmade_render_group.cpp: Revert LightingTest() to perform one iteration

30:10Run the game and consider building a wall

30:45handmade_world_mode.cpp: Make AddStandardRoom() add a wall

33:35Run the game to see our wall

35:56handmade_render_group.cpp: Enable LightingTest() to compute the colours differently in the debug and game view

39:24Run the game to see the beautiful game view

41:19handmade_render_group.cpp: Consider gathering the light from the cubes' corners rather than their faces

42:53handmade_config.h: Add Global_Renderer_Lighting_ShowReflectors and Global_Renderer_Lighting_IterationCount

45:08win32_handmade.cpp: Try to add keys in Win32ProcessPendingMessages() to control the reflectors and lighting iteration count

46:47handmade_opengl.cpp: Prevent OpenGLRenderCommands() from calling ComputeLightTransport()

47:12win32_handmade.cpp: Increase the resolution in WinMain()

47:34Run the game to see that it's totally usable for lighting

47:45handmade.cpp: Add lighting controls to the debug system

48:43Run the game and try out those lighting controls

49:53Determine to compute the lighting hierarchically

52:12Consult the multipass shadowing algorithm¹

55:07Run the game and consider the problem of shadowing

57:10Blackboard: Comparing reflectors, being an O(n³) problem

58:51Read 14.3 Indirect Lighting and Area Lights²

1:00:26Run the game and consider an iterative solution across multiple frames

1:01:56handmade_render_group.cpp: Start to enable LightingTest() to compute some shadowing

1:03:57Consult the disk-to-disk occlusion algorithm³

1:05:32handmade_render_group.cpp: Enable LightingTest() to compute the disk-to-disk occlusion⁴

1:08:24Blackboard: Shadow Approx.⁵

1:19:58A mini rant on papers giving partial solutions

1:22:06Consider what their saturate function is meant to be doing⁶

1:26:31Blackboard: Understanding their shadow approximation equation⁷

1:29:25handmade_render_group.cpp: Enable LightingTest() to compute this shadow approximation equation⁸

1:32:08handmade_intrinsics.h: Introduce ReciprocalSquareRoot()

1:32:47handmade_render_group.cpp: Continue to implement the shadow equation in LightingTest()⁹

1:41:28Blackboard: Occlusion from in front and behind

1:41:46handmade_render_group.cpp: Break out the shadow equation values in LightingTest()

1:45:22Correcting for occlusion by overlapping objects¹⁰

1:46:43handmade_render_group.cpp: Enable LightingTest() to iteratively occlude

1:50:07Run the game to see the shadowing looking kind of reasonable

1:51:21handmade_render_group.cpp: Make LightingTest() perform one shadowing iteration, and run the game to see that the wall's front face is not all black

1:52:20handmade_render_group.cpp: Move the Dest->Visibility setting one scope out in LightingTest()

1:52:39Run the game to see that the wall's front face is still black here

1:53:51handmade_render_group.cpp: Read carefully though the shadowing code in LightingTest()

1:56:01handmade_render_group.cpp: Add assertions in LightingTest() and compile in debug mode

1:56:43Run the game and fail to hit those assertions

1:58:44handmade_render_group.cpp: Assert in LightingTest() that the Visibility >= Dest->Visibility on the first iteration

1:59:33Run the game, hit that assertion and consider why

2:00:37handmade_render_group.cpp: Add a Shadow in LightingTest() to accumulate based on the Visibility

2:04:42Run the game to see our ambient occlusion solution

2:05:20Q&A

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2:05:20Q&A

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2:05:20Q&A

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2:06:43vkar2 square root (A/pi + r²) = square root (r² * ( A/(pi * r²) + 1) = r * square root (A/(pi * r²) + 1)

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2:06:43vkar2 square root (A/pi + r²) = square root (r² * ( A/(pi * r²) + 1) = r * square root (A/(pi * r²) + 1)

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2:06:43vkar2 square root (A/pi + r²) = square root (r² * ( A/(pi * r²) + 1) = r * square root (A/(pi * r²) + 1)

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2:07:31Blackboard: Pulling the r out of square root (A/π + r²)

2:10:36alexkelbo Thank you very much for 400 days of programming. Had I remembered I would've sent you a golden crown to wear today. You're awesome!

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2:10:36alexkelbo Thank you very much for 400 days of programming. Had I remembered I would've sent you a golden crown to wear today. You're awesome!

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2:10:36alexkelbo Thank you very much for 400 days of programming. Had I remembered I would've sent you a golden crown to wear today. You're awesome!

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2:10:43mtsmox What do extra iterations do for ambient occlusion? I understand it for bouncing light, but shadows?

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2:10:43mtsmox What do extra iterations do for ambient occlusion? I understand it for bouncing light, but shadows?

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2:10:43mtsmox What do extra iterations do for ambient occlusion? I understand it for bouncing light, but shadows?

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2:10:59Blackboard: Calculating ambient occlusion over multiple iterations

2:16:12mtsmox Should the accumulator for the light passes be reset to zero at the start of the next pass?

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2:16:12mtsmox Should the accumulator for the light passes be reset to zero at the start of the next pass?

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2:16:12mtsmox Should the accumulator for the light passes be reset to zero at the start of the next pass?

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2:16:40handmade_render_group.cpp: Make LightingTest() reset the accumulator

2:17:50Run the game to see the current lighting

2:18:14handmade_render_group.cpp: Make LightingTest() perform ambient occlusion

2:18:55Run the game to see how that looks with ambient occlusion

2:20:50handmade_config.h: Increase the Global_Renderer_Lighting_IterationCount and run the game to see how that looks

2:22:22thesizik It seems like the ground colors are off. Looks like it goes light green > gray > dark green

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2:22:22thesizik It seems like the ground colors are off. Looks like it goes light green > gray > dark green

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2:22:22thesizik It seems like the ground colors are off. Looks like it goes light green > gray > dark green

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2:24:24handmade_render_group.cpp: Make LightingTest() cast the Element->Visibility calculation to a V4 in the setting of FrontEmit

2:25:25Run the game to see how that looks

2:26:40Wind it down

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2:26:40Wind it down

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2:26:40Wind it down

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