[video member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Moving the Perspective Divide to OpenGL" vod_platform=youtube id=EDfb-13wgk0 annotator=Miblo]
[0:01][Recap and set the stage for the day]
[1:18][Run the game and demo our current situation with the sorting]
[2:02][Reacquaint ourselves with our work moving the perspective operations over to OpenGL]
[7:00][handmade_render.h: Remove WorldScale from the camera_params struct, and consider removing MetersToPixels and PixelsToMeters globally]
[12:26][handmade_render_group.h: Replace ScreenCenter in camera_transform with ScreenDim]
[13:28][handmade_render_group.h: Introduce SetCameraTransform() and simplify Orthographic() and Perspective()]
[13:50]["This would take a super set of the parameters"][quote 545]
[16:24][Run the game to see that we're at the wrong zoom level]
[16:45][handmade_world_mode.cpp: Make AddStandardRoom() set the camera height lower, and run the game]
[17:34][Determine to fix the debug visualisation rectangles]
[19:15][handmade_render_group.h: Remove MonitorHalfDimInMeters from the render_group struct]
[22:27][handmade_render_group.cpp: Remove UnprojectOld() and make GetCameraRectangleAtDistance() compute the correct rectangle]
[27:03][handmade_world_mode.cpp: Make UpdateAndRenderWorld() compute WorldCameraRect and ScreenBounds]
[29:25][Run the game pnd fail to see the debug rectangles]
[30:56][Step in to UpdateAndRenderWorld() and inspect the bounds]
[38:45][handmade_render_group.cpp: Make Unproject() correctly compute the UnprojectedXY]
[43:24][Step into UpdateAndRenderWorld() and inspect the WorldCameraRect]
[44:25][A few words on easing the process of changing your code]
[47:16][Run the game and determine to get the Z-sorting working by augmenting the ClipRect to be about transforms in general]
[52:54][handmade_opengl.cpp: Start to change OpenGLSetScreenSpace()]
[55:56][handmade_platform.h: #define NotImplemented()]
[1:00:58][Blackboard: Projection coordinates]
[1:04:48][handmade_opengl.cpp: Prevent OpenGLRenderCommands() from scaling the incoming dimensions]
[1:05:08][Run the game and consider the incoming dimensions]
[1:07:35][Blackboard: Z in the Projection Matrix and normalising by W]
[1:13:52][Blackboard: Divide by incoming Z]
[1:16:32][handmade_opengl.cpp: Write the Proj matrix in OpenGLRenderCommands() to enable the divide by Z]
[1:18:31][handmade_render_group.cpp: Make GetRenderEntityBasisP() compute the correct Scale and P]
[1:19:57][Run the game to see it unexpectedly working, and investigate why]
[1:25:18][Step in to OpenGLRenderCommands() and inspect the values]
[1:27:02][handmade_opengl.cpp: Make OpenGLRenderCommands() pass the Z for the bitmaps, and run the game]
[1:28:12][handmade_render_group.cpp: Remove Basis.Scale from all functions, and remove the entity_basis_p_result struct]
[1:30:49][handmade_render_group.cpp: Simplify GetRenderEntityBasisP()]
[1:33:20][Run the game to assess our current situation]
[1:35:15][handmade_render_group.h: Add FocalLength to the render_entry_cliprect struct and propagate it]
[1:40:18][Run the game and consider cleaning this up]
[1:40:56][handmade_render_group.h: Remove ScreenDim from the camera_transform struct and add CurrentClipRect_ to the render_group struct]
[1:46:44][Remove all of the sorting code]
[1:57:31][Q&A]
[1:59:16][@quartertron][Can you please go double-check your matrix math in your last drawing in Milton?]
[2:01:08][@quartertron][More scroll right-ish]
[2:01:37][@quartertron][No, I'm just blind]
[2:02:07][@deezbucks][Are you planning on making a video featuring everything you made?]
[2:03:25][@pepevel][What do you have in mind when it comes to shaders? You plan to use them to sort?]
[2:06:16][@jekasg][How long till ship?]
[2:06:56][@roam00010011][I'm running out of excuses to clean the garage, so... someone ask something long]
[2:07:11][@mvargasmoran][Could you expand on the topic of refactoring (sometimes all the code)? I use git, to move on but keep my old code. So I think I'm scared of changing things]
[2:19:02][@roam00010011][I keep missing the pre-stream, so at what time tomorrow will it start?]
[2:20:00][@dandymcgee][How often do you clean your garage? If you don't have a garage, where do you park your car? If you don't have a car, how do you get to Kansas?]
[2:22:44][@popcorn0x90][I wonder if Jon and Casey are in the same city]
[2:23:10][Close it down with a glimpse into the future]
[2:24:54][Plug Asaf's annotation searcher[ref
    site="GitHub"
    page="Handmade Hero Annotations Search"
    url="https://asafgartner.github.io/annotations_search/"]]
[2:27:36][@Miblo][Yeah, we will roll it into the new annotation system. Planning on working on the new system probably in a month from now, after HMN v1 is settled]
[2:28:16][Thank Asaf for building the annotation searcher]
[/video]