Converting Depth Peel Data to Lighting Data — Handmade Hero — Episode Guide

0:08Recap and set the stage for the day

2:05Consider how to resolve the issue that we're only computing the lighting on the topmost of four depth peels

5:41Mention that multigrid lighting may not work out

9:29Run the game to see the current state of the lighting system

12:31handmade_opengl.cpp: Fix "Minor copy-paste error in handmade_opengl.cpp" issue¹

14:13handmade_opengl.cpp: Prevent ComputeLightTransport() from pulling the emit colour from the DepthPeelResolveBuffer

15:03Run the game to see the existing fake lighting

15:22handmade_opengl.cpp: Enable ComputeLightTransport() to bind lighting textures that come from the depth peel

20:00handmade_opengl.cpp: Introduce CompileDepthPeelToLighting() based on CompilePeelComposite()

29:16handmade_opengl.cpp: Make CompilePeelComposite() compute the FrontEmit, BackEmit, SurfaceColor and NP

32:50handmade_opengl.cpp: Change CompilePeelComposite() to use the layout(location) syntax and take an opengl_program_common

37:55Run the game and see bright white

38:12Research the OpenGL Layout qualifier²^,3

42:35handmade_opengl.cpp: Revert CompilePeelComposite() to not use the layout(location) syntax, and make all the programs explicit

45:20handmade_opengl.cpp: Make OpenGLCreateProgram() reset the SamplerCount, and introduce OpenGLLinkSamplers()

50:15Run the game to see what we had running before

50:31handmade_opengl.cpp: Make all the shader programs use OpenGLLinkSamplers(), as a partial way towards layout(location)

56:00handmade_opengl.cpp: Make UseProgramBegin() set up all of the samplers for the program

56:59Run the game to see that we're back to normal, view the beautiful depth buffer and investigate why we are seeing it

1:01:07handmade_opengl.cpp: Hard set CompileZBiasProgram() to write red into BlendUnitColor[0]

1:01:43Run the game to see that it isn't all red, and determine that some other phase must be wrong

1:03:13handmade_opengl.cpp: Make CompileResolveMultisample() pass the samplers to OpenGLLinkSamplers() in the correct order, and run the game to see that we're back to normal

1:03:35handmade_opengl.h and handmade_opengl.cpp: Remove peel_composite_program, final_stretch_program and multigrid_light_up_program, and their corresponding OpenGLProgramBegin() functions

1:06:09Run the game to see that we're still fine

1:06:15handmade_opengl.cpp: Try and force CompileResolveMultisample() to use layout(location = 8)

1:10:45handmade_opengl.cpp: Toggle back on the depth peel importing in ComputeLightTransport()

1:11:17Run the game to see that this does appear to have imported the lighting values

1:13:52Determine to bounce the light around

1:17:30Blackboard: Multigrid light transport

1:20:42Blackboard: The multigrid dream

1:27:54handmade_opengl.cpp: Consider what we can do in CompileMultiLightDown()

1:29:26Blackboard: Bouncing light

1:30:21Blackboard: Figuring out how aligned light sources are

1:31:02handmade_opengl.cpp: Make CompileMultiLightDown() compute the facing term, the distance between lights and the falloff⁴

1:34:45Note that we're not reconstructing the light positions

1:35:19"That's gonna be a whole bailiwick in and of itself"^α

1:36:08handmade_opengl.cpp: Make ReconstructPosition() in CompileMultiLightDown() use UV

1:36:52Run the game, crash in ExecuteBrain() and investigate why

1:39:02win32_handmade.cpp: Reduce the resolution in WinMain() and run the game to see that that looks better

1:41:06handmade_opengl.cpp: Make CompileZBiasProgram() create a white light and run the game to see what's happening

1:42:49handmade_opengl.cpp: Investigate why we are not seeing any colour contribution from textures

1:44:52handmade_opengl.cpp: Fix TransferLight() in CompileZBiasProgram() to use the Falloff, and run the game to see colour contributon

1:45:13handmade_opengl.cpp: Make TransferLight() in CompileZBiasProgram() transfer based on the facing direction and run the game to see that that is not working

1:47:43handmade_opengl.cpp: Investigate why the facing direction isn't producing the expected transfer

1:52:44handmade_opengl.cpp: Make CompileMultiGridDown() write the reconstructed normal into our second channel, and run the game to inspect that channel

1:55:27handmade_opengl.cpp: Make ReconstructNormal() in CompileMultiGridDown() overwrite the Z with 0 and run the game to see that upward facing components still contain green

1:57:02handmade_opengl.cpp: Make CompileDepthPeelToLighting() correctly compute the Nx and Ny and run the game to see better values

1:57:48handmade_opengl.cpp: Make ReconstructNormal() in CompileMultiGridDown() use the computed Z and run the game with more confidence that the normals are plausible

1:58:28handmade_opengl.cpp: Continue investigating why we're not getting any light transference

2:00:36handmade_opengl.cpp: Make CompileZBiasProgram() output the negative inner product of the surface normals

2:01:20Run the game to see that negative product

2:01:39handmade_opengl.cpp: Make CompileZBiasProgram() output the non-negative inner product of the surface normals

2:01:47Run the game to see this non-negative product

2:04:06Q&A

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2:04:06Q&A

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2:04:06Q&A

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2:04:50Miblo Could some of our lighting code end up being used by the audio system to figure out where and how obstructed / reflected sound sources are?

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2:04:50Miblo Could some of our lighting code end up being used by the audio system to figure out where and how obstructed / reflected sound sources are?

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2:04:50Miblo Could some of our lighting code end up being used by the audio system to figure out where and how obstructed / reflected sound sources are?

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2:06:01lorto6 Try 1 - clamp()!

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2:06:01lorto6 Try 1 - clamp()!

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2:06:01lorto6 Try 1 - clamp()!

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2:06:27Blackboard: Clamping normals

2:08:03asafgartner Should you add a fake ceiling for lighting (or a non-fake ceiling based on the floor above the current one)?

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2:08:03asafgartner Should you add a fake ceiling for lighting (or a non-fake ceiling based on the floor above the current one)?

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2:08:03asafgartner Should you add a fake ceiling for lighting (or a non-fake ceiling based on the floor above the current one)?

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2:08:48xyane Not entirely related to today's stream, but will you perhaps use something like a pipeline state object for binding resources? I personally find that I get a few annoying debug messages telling me about resource hazards and I'd like a better way than randomly throwing in null binds in the middle of my code and would like a better way to bind resources to minimize API calls, and would love to see a good PSO implementation

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2:08:48xyane Not entirely related to today's stream, but will you perhaps use something like a pipeline state object for binding resources? I personally find that I get a few annoying debug messages telling me about resource hazards and I'd like a better way than randomly throwing in null binds in the middle of my code and would like a better way to bind resources to minimize API calls, and would love to see a good PSO implementation

🗪

2:08:48xyane Not entirely related to today's stream, but will you perhaps use something like a pipeline state object for binding resources? I personally find that I get a few annoying debug messages telling me about resource hazards and I'd like a better way than randomly throwing in null binds in the middle of my code and would like a better way to bind resources to minimize API calls, and would love to see a good PSO implementation

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2:11:34We are done for today

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2:11:34We are done for today

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2:11:34We are done for today

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