Crashing the Stream with a Fragment Shader | Handmade Hero Episode Guide

0:04Recap and set the stage for the day

1:17Determine to handle the "Unable to compile Z Bias program on GTX 1070" issue¹

4:17Run the game to see the current voxel-based lighting solution

5:00handmade_opengl.cpp: Change all the shaders to use GLSL version 3.30²

7:30Run the game to see everything working as before

8:10Close that issue

12:19Determine to fix the "Shader layout issue" issue³

13:22win32_handmade.cpp: Set GLSL version 3.30 in Win32OpenGLAttribs, run the game, and close that issue

14:26Close the "Not compiling under VS2015" issue⁴

16:28Run the game, describe the voxel lookup scheme and determine to transfer this lighting solution to the GPU

20:23handmade_world_mode.h: Consider how to specify the lighting_textures to the GPU

23:26handmade_render_group.h: Introduce render_entry_lighting_transfer

25:41handmade_render_group.cpp: Introduce PushLighting()

29:05handmade_render_group.cpp: Make OutputLighting() call PushLighting()

30:05Run the game and hit the InvalidDefaultCase in OpenGLRenderCommands()

30:33handmade_opengl.cpp: Add a case in OpenGLRenderCommands() for the lighting_transfer⁵^,6

40:17handmade_platform.h: Move in lighting_texel and lighting_textures from handmade_opengl.h

40:52win32_handmade.cpp: Pull in glTexImage3D() and glTexSubImage3D() from corearb.h⁷

43:37Run the game and hit an error, presumably because we haven't bound our lighting texture

44:43handmade_opengl.cpp: Make OpenGLChangeToSettings() bind and free the lighting textures⁸^,9

54:33Run the game without error

55:04handmade_render_group.cpp: Make OutputLightingTextures() call PushLighting()

56:44Run the game under the assumption that our lighting solution is now available on the GPU

57:07handmade_opengl.cpp: Remove the old lighting code from CompileZBiasProgram(), and enable it to lookup into our voxel-based lighting solution¹⁰

1:17:09handmade_opengl.cpp: Make CompileZBiasProgram() and its UseProgramBegin() set up the voxels and link the samplers

1:20:45handmade_render_group.cpp: Make PushLighting() take the voxel data

1:22:23Run the game and see black

1:22:53handmade_opengl.cpp: Make OpenGLRenderCommands() bind the lighting textures

1:25:13Run the game and see no obvious errors, but still black

1:26:00handmade_opengl.cpp: Investigate what CompileZBiasProgram() is drawing

1:28:57Run the game and see red

1:29:00handmade_opengl.cpp: Investigate why we are always getting an index value of 0

1:33:36Run the game, toggle to the lighting view and inspect the values produced by OutputLightingTextures()

1:37:28handmade_render_group.cpp: Temporarily add volatile global variables for DebugX, DebugY, DebugZ and DebugColor

1:39:46Run the game and inspect those debug lighting values

1:40:11handmade_opengl.cpp: Force CompileZBiasProgram() to lookup into those debug values

1:40:58Run the game, toggle to the lighting view and determine that we are not getting valid values from the texture

1:42:28handmade_opengl.cpp: Change CompileZBiasProgram() to use usampler3D rather than sampler3D for the lookup sampler¹¹

1:52:55handmade_opengl.cpp: Revert CompileZBiasProgram() to use sampler3D, and itself convert the incoming colour to the 0 to 65535 range

1:54:11Run the game and crash the stream, to be lost forever were it not for the magic of Mārtiņš Možeiko

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