83 lines
7.4 KiB
Plaintext
83 lines
7.4 KiB
Plaintext
[video output=day399 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Creating a CPU-side Lighting Testbed" vod_platform=youtube id=4LEFWEbrnPc annotator=Miblo]
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[0:09][Recap and set the stage for the day, with a few words on loadable shaders and heredoc indentation]
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[2:45][handmade_opengl.cpp: Try out @mmozeiko's idea to put a closing quote before the heredoc text]
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[3:41]["Unfortunately it looks like here 4coder is too smart for us"][quote 588]
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[4:27][Spec out a possible string opener for 4coder to understand]
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[5:31][@mmozeiko][Oh, that worked: __blablaFOO]
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[5:37][handmade_opengl.cpp: Play further with the heredoc stuff, before admitting defeat for now with thanks to @mmozeiko]
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[7:19][Run the game to see where we last left off, noting that we are perhaps taking an unproductive approach in developing the system for the GPU]
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[11:35][Switch our development of the lighting system to the CPU-side]
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[13:53][handmade_render_group.cpp and handmade_world_mode.cpp: Introduce LightingTest() in order to enable UpdateAndRenderWorld() to hijack the RenderGroup]
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[19:16][Run the game to see our sprites]
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[19:40][handmade_render_group.cpp: Enable LightingTest() to edit the vertices]
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[21:45][Run the game to see a completely whitewashed screen]
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[22:58][handmade_render_group.cpp: Introduce struct lighting_element]
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[26:12]["Don't scratch your eye"][quote 589]
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[26:35][handmade_render_group.cpp: Make LightingTest() initialise an array of lighting_element]
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[27:35][Blackboard: Extracting the vertex data of sprites]
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[28:44][handmade_render_group.cpp: Enable LightingTest() to copy that vertex data in to the Elements array]
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[33:13][Blackboard: Computing the radius]
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[33:34][handmade_render_group.cpp: Fix compile errors in LightingTest()]
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[34:57][Run the game and see no difference]
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[35:03][handmade_render_group.cpp: Enable LightingTest() to copy the lighting back out to the quads in a diamond shape]
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[40:35][Blackboard: Producing a full coordinate system from a vector for drawing out the lighting]
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[46:20][handmade_render_group.cpp: Enable LightingTest() to produce that coordinate system and draw out the diamond]
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[51:10][Run the game and see pure grey]
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[51:22][handmade_render_group.cpp: Investigate what LightingTest() is drawing]
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[54:08][handmade_render_group.cpp: Replace V0 and V2 with Vert0 and Vert2 in LightingTest()]
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[55:25][Run the game to determine that it's probably the pack that is incorrect]
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[56:07][handmade_render_group.cpp: Make LightingTest() multiply the RGBAUnpack4x8() and RGBAPack4x8() calls into the correct colour space]
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[58:28][Run the game to see that we're getting a little closer]
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[58:33][handmade_render_group.cpp: Continue to investigate the problem]
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[59:30][Step in to LightingTest() and inspect the Vert0 and Element->RefC]
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[1:00:52][handmade_render_group.cpp: Make LightingTest() work on Element when computing the lighting]
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[1:01:06][Run the game to see that we're good to go]
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[1:01:14][Step in to LightingTest() to inspect the positional values]
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[1:02:05][handmade_render_group.cpp: Make LightingTest() correctly set the Y]
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[1:02:18][Step in the LightingTest() and again inspect the positional values]
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[1:02:50][handmade_render_group.cpp: Make LightingTest() correctly set the base]
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[1:04:18][Step in to LightingTest() and inspect our expected positions]
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[1:04:29][Run the game to see how we're doing]
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[1:04:42][handmade_render_group.cpp: Make LightingTest() set the vertices in the same order as PushQuad()]
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[1:05:53][Run the game to see our diamond reflectors]
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[1:07:40][handmade_render_group.cpp: Toggle off the copying out of the lighting, and run the game to consider the pink and yellow debug rectangles]
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[1:08:42][handmade_render_group.cpp: Try to make LightingTest() more sanely set the span for long, thin rectangles]
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[1:12:07][Run the game to still see large pink rectangles]
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[1:13:52][handmade_render_group.cpp: Make LightingTest() use the correct winding when copying the lighting in]
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[1:14:24][Run the game to see that that fixes it, and consider this representation of the lighting]
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[1:16:31][handmade_render_group.cpp: Introduce a moveable light source in LightingTest()]
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[1:19:41][Run the game and move our light source]
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[1:20:03][handmade_render_group.cpp: Enable LightingTest() to propagate the light in an O(n²) fashion]
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[1:26:10][Run the game to see black, because the rendering is so slow]
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[1:28:00][handmade_world_mode.cpp: Toggle off the particles and only create one screen]
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[1:29:36][Run the game to see our room]
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[1:29:52][handmade_world_mode.cpp: Reduce the room size in AddStandardRoom()]
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[1:30:48][Run the game and move around our tiny room]
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[1:31:34][handmade_render_group.cpp: Reenable our O(n²) loop and run the game to see our lit room]
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[1:32:44][handmade_render_group.cpp: Change how LightingTest() sets the light colour]
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[1:33:05][Run the game to see the disco lighting]
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[1:33:28][handmade_render_group.cpp: Make LightingTest() clamp the emitters' colours]
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[1:34:31][Run the game to still see a little flickering]
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[1:34:47][handmade_render_group.cpp: Make LightingTest() sum into a separate colour accumulator]
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[1:36:50][Run the game to see that it's somewhat incorrect]
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[1:37:08][handmade_render_group.cpp: Make LightingTest() factor in the distance to the light]
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[1:39:33][Run the game to see that it's still a little bit wonky]
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[1:41:15][handmade_render_group.cpp: Make LightingTest() factor in the distance falloff]
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[1:41:58][Run the game and consider that we may have too much angular flickering]
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[1:43:19][handmade_render_group.cpp: Make LightingTest() propagate the light in three loops]
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[1:44:13][Run the game to see a lot of flickering, and consider the sanity of developing on the CPU]
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[1:45:01][handmade_render_group.cpp: Prevent LightingTest() from using the distance falloff, and only do one iteration]
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[1:45:32][Run the game and wonder why lateral movement causes so much flickering]
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[1:46:44][handmade_render_group.cpp: Consider where LightingTest() may be wrong]
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[1:48:06][Q&A][:speech]
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[1:49:07][@kim_jorgensen][Could you enable the overlay. Your head is in the way]
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[1:49:35][Consult Microsoft Spy++ for the currently open programs]
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[1:52:38][@mmozeiko][Sorry the trick didn't work, it works for editor I use. There is an option to try to use old non-raw string literals: char* shader = STRINGIFY( ... write multiline code here ... ); where STRINGIFY is macro with # preprocesor thing. Compiler will smush multi-line code into one-line string and you'll lose line numbers in error messages, but they don't seem to be used on stream anyway]
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[1:53:44][handmade_opengl.cpp: Try to #define SHADER_CODE in an effort to enable 4coder to indent our shader code]
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[1:58:28][@thecrypticmind][Hi! Not sure if this might be something for the forums, but I am on Day 60 and I just swapped to develop on my laptop and am noticing that I am missing the frame rate pretty frequently when Sleep is called: it misses with a few ms. My output log is not as smooth as yours with 33.33m/s every log message, but instead it fluctuates a bit over it. Is this something that gets addressed further down in the episodes?]
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[1:58:44][@Brian][Did the black overlay disapear during the stream, or during Q&A? From the code, if TargetActive, we fade in the CornerWindow. But if the countdown has finished and what not, then it is not active any more]
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[2:00:01][@mmozeiko][You can do char* shader = SHADER_CODE(n#include "shader.h"n); and then put code in new shader.h file, maybe then indentation will be fine afterwards]
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[2:00:38][@mmozeiko][No, it will work]
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[2:02:28][Close it down][:speech]
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[/video]
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