50 lines
4.2 KiB
Plaintext
50 lines
4.2 KiB
Plaintext
[video output=day306 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Debugging Graph-based Sort" vod_platform=youtube id=bMjnXBR98UY annotator=Miblo]
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[0:11][Recap and set the stage for the day]
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[1:40][Run the game and see the current state]
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[3:51]["Let's use the word "evolucent""][quote 497]
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[4:06][handmade_render_group.cpp: Make PushRenderElement_() take and set the ScreenArea]
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[5:01][handmade_render_group.cpp: Make PushRect() set the ScreenArea]
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[6:54][handmade_render_group.cpp: Make PushBitmap() set a provisional ScreenArea for the sprite]
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[8:10][Blackboard: The ScreenArea for Regular vs Rotated Sprites]
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[11:51][handmade_render_group.h: Add ScreenArea to render_group and make Clear() take it]
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[17:03][handmade_render_group.cpp: Make Perspective() set the ScreenArea]
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[18:15][Debugger: Run the game, crash in BuildSpriteGraph() and inspect the ScreenArea values]
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[20:18][handmade_render_group.cpp: Look through GetRenderEntityBasisP() and note that NearClipPlane is set so that 0 is clipped out]
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[20:59][Debugger: Inspect the values of B]
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[21:48][handmade_render_group.cpp: Assert in PushRenderElement_() that GetArea(ScreenArea) < 2000 * 2000]
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[23:28][handmade_math.h: Introduce GetArea()]
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[24:36][Debugger: Run the game and hit that assertion, then step out and see who called that function]
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[26:13][handmade_render_group.cpp: Comment out that assertion, run the game and look at the actual bug]
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[26:28][handmade_render.cpp: Reenable the PushStuct() call in SortEntries()]
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[26:54][Run the game and see that we're running incredibly slowly]
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[27:27][handmade_render.cpp: Make BuildSpriteGraph() and WalkSpriteGraph() a TIMED_FUNCTION]
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[27:58][build.bat: Switch to -O2]
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[28:24][Run the game and realise that we can't see the debug display because it isn't sorted correctly]
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[29:06][build.bat: Switch back to -Od]
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[29:52][Run the game and see that we're getting some pretty non sequitur results]
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[30:46][handmade.cpp: Switch back to the title sequence in order to see how the sorting routine performs on these]
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[31:43][Note that the drop shadow of the text is being sorted incorrectly]
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[33:42][handmade_cutscene.cpp: Try and scramble the order of the first scene's layers]
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[34:22][Run the game and see that the scene is now incorrectly sorted]
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[35:25][Debugger: Break into BuildSpriteGraph() and inspect the values for A and B]
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[35:56][handmade_render.cpp: Prevent BuildSpriteGraph() from comparing NodeIndexA with itself]
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[36:51][Debugger: Break into BuildSpriteGraph() and see that A and B are now different]
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[38:50][Debugger: Step through BuildSpriteGraph() and see if it behaves as expected]
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[41:03][Debugger: Step through WalkSpriteGraph() and RecursiveFromToBack() and see if they behave as expected]
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[45:37][Debugger: Step through OpenGLRenderCommands() and inspect the SortedIndices array]
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[47:09][handmade_cutscene.cpp: Make RenderLayeredScene() DebugTag the cutscene layers]
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[50:34][Debugger: Run the game, step through BuildSpriteGraph() and RecursiveFromToBack() and watch the DebugTag values]
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[52:30][handmade_cutscene.cpp: Revert the cutscene layers to their original order]
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[52:55][Debugger: Step through RecursiveFromToBack(), watch the DebugTag values and confirm that the code is doing what we think it is doing]
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[54:27][handmade_render.cpp: Look through how the sort_sprite_bound flows through the functions]
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[56:50][handmade_cutscene.cpp: Note the reason why the cutscene was sorting as it was]
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[58:12][handmade_world_mode.cpp: Make UpdateAndRenderWorld() only generate one screen and disable the Monstar]
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[1:00:18][handmade_world_mode.cpp: Prevent AddStandardRoom() from calling BeginGroundedEntity()]
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[1:00:36][Run the game and hit the Assert in OpenGLRenderCommands() because ClipRectCount == 0]
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[1:01:39][Debugger: Investigate how we ended up with no ClipRects]
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[1:05:27][handmade_render_group.cpp: Make BeginRenderGroup() rather than Perspective() take the PixelWidth and PixelHeight in order to compute the ScreenArea, and call PushClipRect()]
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[1:09:26][handmade_world_mode.cpp: Make AddStandardRoom() create one tile]
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[1:09:57][Run the game and see that our sort appears to handle our Y-sprites just fine, but that our Z-sprites are all messed]
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[1:10:32][Defer questions until Monday and end it now][:speech]
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[/video]
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