cinera_handmade.network/cmuratori/hero/code/code088.hmml

[video output=day088 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Push Buffer Rendering" vod_platform=youtube id=zbufcZ_JBbU annotator=Miblo annotator=dspecht annotator=ZedZull]
[0:37][Investigate possible bug in the collision detector]
[3:02][Pass TestP to SpeculativeCollide and also base MoverGroundPoint off TestP]
[3:27][Make a version of GetEntityGroundPoint that takes ForEntityP]
[4:36][Walk around in-game]
[5:00][Put the stairs back in and try colliding with them]
[5:59][Increase GroundBufferCount from 32 to 64]
[7:02][Think about sorting entities in a render list and scaling bitmaps]
[8:48][Look at the TODO list]
[9:31][Create handmade_render_group.h]
[9:53][Consider sorting and translating the coordinate systems]
[10:53][Take a look at how the buffering currently works]
[11:22][Pull out entity_visible_piece and entity_visible_piece_group into handmade_render_group.h]
[12:23][#include handmade_render_group.h and handmade_render_group.cpp in handmade.cpp]
[12:50][Expand the notion of the PieceGroup so that it tracks everything]
[14:31][Move the rendering outside]
[15:35][Now all the pieces are in one giant buffer, and we have no idea which one goes with which entity]
[16:07][Introduce render_basis]
[17:06][Enable setting the render_basis after moving the entities around]
[20:16][Set the DefaultBasis and point to it]
[21:48][View the results in-game]
[23:15][Move PieceGroup up and give it its own memory]
[24:40][Change all of the draw calls to operate off the PieceGroup]
[26:19][Check it out in-game]
[26:39][The inversion and scaling is all still happening erroneously]
[27:19][Look at what the Push functions are doing]
[28:05][Try and regularise how the rendering works]
[29:40][See how it looks in-game]
[30:16][Investigate why the Bitmaps aren't being drawn in the correct places]
[35:00][It's drawing the same Bitmap]
[35:21][Moment of realisation: Rather than sending the whole loaded_bitmap down, we were using one on the stack]
[36:32][Consider ways to pass the correct Bitmaps]
[37:13][Send the whole Bitmap to ground_buffer]
[38:55][See if that fixes our problem]
[39:40][Get rid of that other DrawRectangle call]
[40:31][Rename entity_visible_piece_group to render_group]
[41:17][Consider how we want to extend the notion of render_group so that you can have multiple things pushed onto this render stack]
[41:56][Consider linked list vs packed set]
[42:43][Add PushBufferBase, PushBufferSize and MaxPushBufferSize to render_group]
[43:52][Introduce AllocateRenderGroup in handmade_render_group.cpp]
[45:18][#define PushSize macro]
[45:40][Allocate MaxPushBufferSize and store it in PushBufferBase]
[45:55][Initialise all of the fields of the render_group]
[46:16][Call AllocateRenderGroup and set MaxPushBufferSize to 4MB]
[46:52][Make the DefaultBasis get allocated and initialise it]
[47:21][Store MetersToPixels rather than GameState and pass it to AllocateRenderGroup]
[48:06][Initialise MaxPushBufferSize and PushBufferSize]
[48:36][Now we've got a problem: When we do PushPiece we can't get one because we don't know where that piece is anymore]
[48:44][Attend to the other issues]
[50:11][Straighten out the PushBuffer situation]
[54:07][See if it works in-game]
[54:46][Blackboard: PieceGroup]
[56:23][Blackboard: Compression Oriented Programming]
[56:57][Blackboard: render_group]
[58:19][Q&A][:speech]
[59:16][@miblo][Will things like filters end up in the render_group?]
[1:00:55][@cezonezor][How long will the renderer take?]
[1:02:29][@poohshoes][Could you give us examples of what some of the simpler things will be in the render_group?]
[1:02:47][@gplwhite][Are there any static code analysis tools for C / Visual Studio that will help pick up bugs like unused variables, etc?]
[1:04:38][@d7samurai][So are you planning on abstracting away the renderer as a layer, similar to how we separated the platform from the game code, so that the various renderers will be operating on the same data structures?]
[1:05:48][@ezioauditorerevs][If you were going to write an algorithm to generate Sudoku puzzles, how would it work?]
[1:06:03][@mr4thdimention][Unused variables are a warning on my compiler. Did you turn that warning off? I use an allow local macro when I want it to ignore the variable]
[1:06:56][@jfcatalan][Would it make sense for the render_group to contain render groups itself?]
[1:07:44][@d7samurai][I meant whether you plan for the data describing what needs to be rendered to be in a format such that it's suitable for both software and hardware rendering]
[1:08:45][@boondoggle42][Will our hero always be taller than the treetops?]
[1:09:58][We've finished early... or have we?]
[1:10:19][@abnercoimbre][Are we keeping the 5PM schedule?]
[1:12:06][Wrap it up with a recap and closing remarks][:speech]
[/video]