Adding Distance-based Fog — Handmade Hero — Episode Guide

0:09Recap and set the stage for the day

2:51Run the game and show where we left off

3:18handmade_world_mode.cpp: Make PlayWorld() stack up 10 rooms and run the game to view them

4:57handmade_world_mode.cpp: Make AddStandardRoom() create holes on every floor

5:18Run the game to view the entities each floor comprises, and determine to reintroduce fog

11:57handmade_opengl.cpp: Try to introduce a GlobalFrameBufferDepth for OpenGLRenderCommands() to output a bitmap¹

14:51Run the game to find that glFramebufferTexture2D() failed, and undo our changes

17:47handmade_opengl.cpp: Begin to reintroduce fog

20:13Blackboard: "Fog" darkening based on distance

25:30handmade_opengl.cpp: Enable the VertexCode to linearly interpolate between the FragColor and FogColor, using GLSL's mix()²

36:16Run the game to see the blending between the two colours

36:53handmade_opengl.cpp: Investigate why the bitmaps are not getting fogged

41:42handmade_opengl.cpp: Enable the FragmentCode to perform the fogging lerp

44:09Run the game to see what we'd expect to see

44:33handmade_opengl.cpp: Enable the VertexCode to compute the FogAmount based on the distance from camera

49:14handmade_opengl.cpp: Introduce Clamp01MapToRange() in the shader

51:14handmade_opengl.cpp: Make the VertexCode call that Clamp01MapToRange()

52:32Run the game and assume that nothing is incorrect there

52:45handmade_opengl.cpp: Make OpenGLInit() and OpenGLRenderCommands() setup our fog data

56:18A few words on threading cables through conduits

58:18handmade_render_group.h: Consider removing render_entry_cliprect in favour of render_entry_textured_quads

1:01:03handmade_render_group.h: Remove render_entry_bitmap, render_entry_rectangle, render_entry_clear and render_entry_saturation

1:02:38Note that this simplification provides us with the ability to view the fog from a different direction

1:03:34handmade_render_group.h: Add fog data to render_entry_cliprect

1:03:54handmade_opengl.cpp: Make the render_entry_textured_quads case in OpenGLRenderCommands() set the fog data

1:05:08win32_handmade.cpp: Pull in glUniform1f, glUniform2fv, glUniform3fv and glUniform4fv from corearb.h³

1:08:06Run the game to determine that we are passing everything through correctly

1:08:16handmade_render_group.h: Add a render_entry_cliprect LastSetup to render_group and propagate that change

1:13:36handmade_render_group.cpp: Clean up how the render_entry_cliprect NewSetup gets used

1:19:58handmade_math.h: Introduce versions of RectMinMax() and RectMinDim() that return a rentangle2i

1:21:32handmade_render_group.cpp: Continue cleaning up the use of NewSetup

1:22:42Run the game to see nothing yet

1:23:01handmade_render_group.cpp: Make BeginRenderGroup() initialise the fog distances

1:23:45Run the game to see our game drawing correctly, and note why

1:24:47handmade_render_group.cpp: Enable SetCameraTransform() to compute the fog by its distance

1:26:36Run the game to see the fog taking effect through the hole

1:27:21handmade_opengl.cpp: Enable the FragmentCode to take a FogColor and blend part of it

1:30:19handmade_render_group.h: Add FogColor to render_entry_cliprect

1:30:28handmade_opengl.cpp: Make OpenGLRenderCommands() set that FogColor

1:31:40Run the game to see our programatically set fog colour

1:31:45handmade_render_group.cpp: Tweak the FogColor in BeginRenderGroup()

1:33:14handmade_render_group.cpp: Investigate how Clear() is working

1:35:57handmade_math.h: Introduce LinearTosRGB()

1:36:33handmade_render_group.cpp: Make BeginRenderGroup() Square the FogColor, and run the game to determine that the Clear does not go through sRGB

1:37:06handmade_platform.h: Label the ClearColor in game_render_commands as not in linear space, but in sRGB space

1:39:05handmade_render_group.cpp: Make Clear() set the FogColor

1:41:21Run the game and consider that to be quite good

1:42:30Consider handling alpha fading of levels nearer to the camera than the hero's current level

1:43:39handmade_world_mode.cpp: Enable AddStandardRoom() to generate stairs

1:49:23Run the game and hop down the stairs

1:51:25handmade_render_group.h: Rename render_entry_cliprect to render_setup for render_entry_textured_quads to contain, and propagate this change, simplifying PushSetup() and OpenGLRenderCommands()

2:13:17handmade_render.cpp: Remove LinearizeClipRects() and PrepForRender()

2:14:39Run the game to see that that worked just great, with a few words on how much cleaner the render commands are now

2:15:57Q&A

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2:15:57Q&A

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2:15:57Q&A

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2:16:50nyeecola Has the framerate tanked after implementing fog? Or was that a wrong impression of mine?

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2:16:50nyeecola Has the framerate tanked after implementing fog? Or was that a wrong impression of mine?

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2:16:50nyeecola Has the framerate tanked after implementing fog? Or was that a wrong impression of mine?

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2:17:02Compile and run with various optimisation settings

2:19:54Miblo Now that we're full 3D, may it be worth extending the debug visualisation rectangles into the third dimension?

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2:19:54Miblo Now that we're full 3D, may it be worth extending the debug visualisation rectangles into the third dimension?

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2:19:54Miblo Now that we're full 3D, may it be worth extending the debug visualisation rectangles into the third dimension?

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2:20:19nyeecola Why would you (in this case) compile without optimizations? I don't get how it changes your framerate that much (sorry if this is a dumb question)

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2:20:19nyeecola Why would you (in this case) compile without optimizations? I don't get how it changes your framerate that much (sorry if this is a dumb question)

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2:20:19nyeecola Why would you (in this case) compile without optimizations? I don't get how it changes your framerate that much (sorry if this is a dumb question)

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2:21:28handmade_sim_region.cpp: Make a KillSwitch to disable GetClosestTraversable()

2:23:42Run the game and compare the framerate with and without GetClosestTraversable() running

2:25:43Step in to GetClosestTraversable() and calculate how many operations it performs, and the number of cycles in which it must execute

2:30:12Look at the disassembly for GetClosestTraversable() when compiled with -Od

2:33:00Switch to -O2 and look at the disassembly for GetClosestTraversable() again

2:36:08Compiling with optimisations on inhibits our ability to debug the code effectively

2:39:55macielda How do you feel about Uniform Buffer Objects? Am I right to assume the Render Setup struct could be passed to the shader as an UBO instead of separate Uniforms?

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2:39:55macielda How do you feel about Uniform Buffer Objects? Am I right to assume the Render Setup struct could be passed to the shader as an UBO instead of separate Uniforms?

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2:39:55macielda How do you feel about Uniform Buffer Objects? Am I right to assume the Render Setup struct could be passed to the shader as an UBO instead of separate Uniforms?

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2:40:24macielda How does the hero know it should hop to the lower level instead of the upper level at the end of the stairs? Where is the code for that?

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2:40:24macielda How does the hero know it should hop to the lower level instead of the upper level at the end of the stairs? Where is the code for that?

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2:40:24macielda How does the hero know it should hop to the lower level instead of the upper level at the end of the stairs? Where is the code for that?

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2:41:10thesizik What does the software renderer look like at the moment?

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2:41:10thesizik What does the software renderer look like at the moment?

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2:41:10thesizik What does the software renderer look like at the moment?

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2:41:33chrysos42 I assume the problems you solve in Handmade Hero are fairly representative of problems you face as a game dev. Can you comment about any social aspects of being a game dev, e.g. how collaborative or supportive the community is, or what it's like sharing a codebase with a number of others?

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2:41:33chrysos42 I assume the problems you solve in Handmade Hero are fairly representative of problems you face as a game dev. Can you comment about any social aspects of being a game dev, e.g. how collaborative or supportive the community is, or what it's like sharing a codebase with a number of others?

🗪

2:41:33chrysos42 I assume the problems you solve in Handmade Hero are fairly representative of problems you face as a game dev. Can you comment about any social aspects of being a game dev, e.g. how collaborative or supportive the community is, or what it's like sharing a codebase with a number of others?

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2:44:18rocketbuny How many lines of code does Handmade Hero have?

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2:44:18rocketbuny How many lines of code does Handmade Hero have?

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2:44:18rocketbuny How many lines of code does Handmade Hero have?

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2:47:42Wind it on down with a glimpse into the future

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2:47:42Wind it on down with a glimpse into the future

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2:47:42Wind it on down with a glimpse into the future

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