Optimizing Render Target Blends and Clears — Handmade Hero — Episode Guide

0:40Run the game and set the stage for the day

1:55handmade_render.cpp: Accelerate BlendRenderTarget() with SIMD instructions

11:06Run the game and see that it's fine

11:40handmade_render.cpp: Introduce ClearRectangle() based on BlendRenderTarget(), and make RenderCommandsToBitmap() call it

18:21Run the game and see how that does

19:27build.bat and win32_handmade.cpp: Switch to -Od and disable threading in order that we can step in to the code

21:13Debugger: Step in to ClearRectangle() and inspect the Color values

22:10handmade_render.cpp: Make ClearRectangle() correctly compute those Color values

23:46Debugger: Step in to ClearRectangle() and inspect the Sr values

25:05Blackboard: Operating on reciprocal square-root of X in such a way that we end up with the square-root

26:38handmade_opengl.cpp: OpenGLRenderCommands() glClearColor()

27:51Internet: Consult the EXT_framebuffer_sRGB documentation¹

28:15handmade_render.cpp: Make ClearRectangle() operate in linear space, not gamma space

29:08Run the game and see that we're a little better

29:55handmade_render.cpp: Revert ClearRectangle() to operate in gamma space, and investigate why the clear color is not correct

31:59handmade_render.cpp: Make BlendRenderTarget() use the SourceColor in the blend

35:09Run the game and see that the alpha blending now works

35:41handmade_entity.cpp: Make UpdateAndRenderEntities() draw the traversables at their full size

36:42handmade_render.cpp: Investigate why the hero's body isn't being skewed correctly in the software renderer

37:43Run the game and demo the incorrect bending

38:44handmade_render.cpp: Trim out some superfluous stuff from DrawRectangleQuickly()

42:01Run the game and demo our bugs

42:58Debugger: Look through ClearRectangle() and consider what could be going wrong

47:10handmade_render.cpp: Make ClearRectangle() set the Color values in the 65534 space

47:23Run the game, see how close we are and wonder why we suddenly see pink upon switching back to the software renderer

48:17handmade_opengl.cpp: Prevent OpenGLDisplayBitmap() from doing the blending

49:03Run the game and see that we're good to go

50:37handmade_render.cpp: Investigate why DrawRectangleQuickly() is not bending the hero correctly

57:12handmade_render.cpp: Remove extraneous initialisations from DrawRectangleQuickly()^α

58:52Blackboard: Doing the dot-product on unit vectors vs vectors with length

1:00:54Blackboard: Doing that in a non-orthogonal coordinate space

1:02:08Q&A

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1:02:08Q&A

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1:02:08Q&A

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1:02:37krrsplat Earlier when that pink color showed up, that was the color you used long long ago when you were setting up the OpenGL renderer

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1:02:37krrsplat Earlier when that pink color showed up, that was the color you used long long ago when you were setting up the OpenGL renderer

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1:02:37krrsplat Earlier when that pink color showed up, that was the color you used long long ago when you were setting up the OpenGL renderer

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1:02:56Blackboard: Why we were seeing the pink

1:04:48thesizik Are the PynX and V calculations correct?

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1:04:48thesizik Are the PynX and V calculations correct?

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1:04:48thesizik Are the PynX and V calculations correct?

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1:05:16krrsplat As far as the vectors go for movement, can you just add U and V to get the new movement?

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1:05:16krrsplat As far as the vectors go for movement, can you just add U and V to get the new movement?

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1:05:16krrsplat As far as the vectors go for movement, can you just add U and V to get the new movement?

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1:05:34bryanwwag Could normal maps be render targets here with appropriate enums / branching to blend / light, or do they still belong outside of the current render targets array?

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1:05:34bryanwwag Could normal maps be render targets here with appropriate enums / branching to blend / light, or do they still belong outside of the current render targets array?

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1:05:34bryanwwag Could normal maps be render targets here with appropriate enums / branching to blend / light, or do they still belong outside of the current render targets array?

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1:06:14realist_01 Do you think you could transform this game into a network game that multiple players can have different kinds of character assets, and, if yes, will you consider doing it?

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1:06:14realist_01 Do you think you could transform this game into a network game that multiple players can have different kinds of character assets, and, if yes, will you consider doing it?

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1:06:14realist_01 Do you think you could transform this game into a network game that multiple players can have different kinds of character assets, and, if yes, will you consider doing it?

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1:06:41thesizik As in, it looked like there might be an X-Y swap in those two variables

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1:06:41thesizik As in, it looked like there might be an X-Y swap in those two variables

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1:06:41thesizik As in, it looked like there might be an X-Y swap in those two variables

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1:07:20bryanwwag Makes sense, I'm comparing it to deferred rendering, which I'm no expert on

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1:07:20bryanwwag Makes sense, I'm comparing it to deferred rendering, which I'm no expert on

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1:07:20bryanwwag Makes sense, I'm comparing it to deferred rendering, which I'm no expert on

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1:08:27realist_01 You should do networking. You could charge for extra items or levels, etc. continuously, thus making you a "reliable" stream of money

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1:08:27realist_01 You should do networking. You could charge for extra items or levels, etc. continuously, thus making you a "reliable" stream of money

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1:08:27realist_01 You should do networking. You could charge for extra items or levels, etc. continuously, thus making you a "reliable" stream of money

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1:08:37thesizik I mean you used an X variable when you meant a Y variable

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1:08:37thesizik I mean you used an X variable when you meant a Y variable

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1:08:37thesizik I mean you used an X variable when you meant a Y variable

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1:10:26Blackboard: Inverting the matrix to solve for UV coordinates

1:13:30vorpleblade What is the blackboard software you are using?

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1:13:30vorpleblade What is the blackboard software you are using?

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1:13:30vorpleblade What is the blackboard software you are using?

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1:13:41realist_01 Nub3sock asked if you would consider local multiplayer

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1:13:41realist_01 Nub3sock asked if you would consider local multiplayer

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1:13:41realist_01 Nub3sock asked if you would consider local multiplayer

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1:14:29Miblo Speaking of normal maps, could we have used those to help sort the sprites? I know they don't give you 3D data, but is there anything in there that we could leverage?

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1:14:29Miblo Speaking of normal maps, could we have used those to help sort the sprites? I know they don't give you 3D data, but is there anything in there that we could leverage?

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1:14:29Miblo Speaking of normal maps, could we have used those to help sort the sprites? I know they don't give you 3D data, but is there anything in there that we could leverage?

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1:16:45Wrap it up

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1:16:45Wrap it up

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1:16:45Wrap it up

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