cinera_handmade.network/cmuratori/hero/code/code244.hmml

[video output=day244 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Finishing Asynchronous Texture Downloads" vod_platform=youtube id=SWtV8B3rssw annotator=Miblo]
[0:55][Build and run the game and note that our textures don't get downloaded]
[1:32][Set the stage for the day with some thoughts on writing software from scratch and the occasional need to use systems which are black boxes]
[5:15][Debugger: Take a stroll through our new OpenGL code]
[9:08][win32_handmade.cpp: Make Win32InitOpenGL return an HGLRC]
[12:20][Debugger: Step into Win32InitOpenGL and consider creating the OpenGL context outside of the queue]
[13:46][win32_handmade.cpp: Claim the Window as a CS_OWNDC]
[14:25][Debugger: Step into Win32CreateOpenGLContextForWorkerThread]
[15:20][Explain what is happening in the debugger while two threads are initialising OpenGL]
[19:14][win32_handmade.cpp: Assert if wglMakeCurrent fails]
[19:52][Run the game and note that we never hit that assertion]
[20:33][Debugger: Step through Win32AllocateTexture]
[21:48][handmade_asset.cpp: Set FinalizeOperation to FinalizeAsset_Bitmap]
[22:32][win32_handmade.cpp: Put in the pointers to AllocateTexture and DeallocateTexture]
[23:05][Debugger: Step through Win32AllocateTexture and see the game correctly rendering in hardware]
[26:06]["I don't know how that ended up working"][quote 397]
[26:38][Mention the fact that there's no synchronisation between the texture downloading and the rendering, and describe our goal with regard to failure cases]
[33:16][handmade_opengl.cpp: Explain the importance of gamma correction]
[36:13][handmade_opengl.cpp: Explain why there are two separate enables for sRGB]
[38:20][Internet: Consult the OpenGL docs[ref
    site=OpenGL
    page="WGL_ARB_pixel_format"
    url=https://www.opengl.org/registry/specs/ARB/wgl_pixel_format.txt][ref
    site="OpenGL"
    page="ARB_framebuffer_sRGB"
    url="https://www.opengl.org/registry/specs/ARB/framebuffer_sRGB.txt"]]
[45:04][win32_handmade.cpp: typedef these WINAPI wgl_ functions and enable the extensions in Win32InitOpenGL]
[1:08:48][Q&A][:speech]
[1:09:10][@yoonfan][Don't you have a race condition according to the C11 and C++11 memory models when you set the texture handle from the worker thread and read it on the rendering thread without any synchronization? I think you need to use an atomic operation or the compiler could mess up the generated code]
[1:10:43][@cubercaleb][Why don't you render directly to the backbuffer at Molly?]
[1:14:20][@brokenopcode][FYI, no you can't change pixel format once it's been set. Need to create a temp window & context, get the wgl*arb function pointers, then destroy context & window and create new window and context with wgl*arb. Very annoying but that's how it works on windows as far as I know]
[1:15:09][@Zamar037][Will we be back to the debug code and finish it up after this, or have we finished it now?]
[1:15:23][@cubercaleb][Thanks for the in depth explanation. Will you be going over modern GL later?]
[1:17:15][@garryjohanson][Apparently in DirectX 12 you can select a separate context for different GPUs]
[1:18:10][@gasto5][Where did you upload the 4coder videos?]
[1:18:33][@d7samurai][Yes, D3D11, too]
[1:18:58][@cubercaleb][Couldn't you also use a PBO for streaming in textures?]
[1:20:35][Wrap it up][:speech]
[/video]
Cinera 0.7.0 Update Add output parameter to all of hero/code, hero/intro-to-c and hero/misc, preserving the current URLs while allowing different .hmml filenames, notably for hero/misc which now gets sorted chronologically. Update the cinera__*.css files 2020-05-09 20:59:36 +00:00			`[video output=day244 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Finishing Asynchronous Texture Downloads" vod_platform=youtube id=SWtV8B3rssw annotator=Miblo]`
Relocate riscy and add newly converted hero The idea here is to reduce the amount of superfluous stuff downloaded to each server running cinera 2017-12-06 22:26:13 +00:00			`[0:55][Build and run the game and note that our textures don't get downloaded]`
			`[1:32][Set the stage for the day with some thoughts on writing software from scratch and the occasional need to use systems which are black boxes]`
			`[5:15][Debugger: Take a stroll through our new OpenGL code]`
			`[9:08][win32_handmade.cpp: Make Win32InitOpenGL return an HGLRC]`
			`[12:20][Debugger: Step into Win32InitOpenGL and consider creating the OpenGL context outside of the queue]`
			`[13:46][win32_handmade.cpp: Claim the Window as a CS_OWNDC]`
			`[14:25][Debugger: Step into Win32CreateOpenGLContextForWorkerThread]`
			`[15:20][Explain what is happening in the debugger while two threads are initialising OpenGL]`
			`[19:14][win32_handmade.cpp: Assert if wglMakeCurrent fails]`
			`[19:52][Run the game and note that we never hit that assertion]`
			`[20:33][Debugger: Step through Win32AllocateTexture]`
			`[21:48][handmade_asset.cpp: Set FinalizeOperation to FinalizeAsset_Bitmap]`
			`[22:32][win32_handmade.cpp: Put in the pointers to AllocateTexture and DeallocateTexture]`
			`[23:05][Debugger: Step through Win32AllocateTexture and see the game correctly rendering in hardware]`
			`[26:06]["I don't know how that ended up working"][quote 397]`
			`[26:38][Mention the fact that there's no synchronisation between the texture downloading and the rendering, and describe our goal with regard to failure cases]`
			`[33:16][handmade_opengl.cpp: Explain the importance of gamma correction]`
			`[36:13][handmade_opengl.cpp: Explain why there are two separate enables for sRGB]`
			`[38:20][Internet: Consult the OpenGL docs[ref`
			`site=OpenGL`
			`page="WGL_ARB_pixel_format"`
			`url=https://www.opengl.org/registry/specs/ARB/wgl_pixel_format.txt][ref`
			`site="OpenGL"`
			`page="ARB_framebuffer_sRGB"`
			`url="https://www.opengl.org/registry/specs/ARB/framebuffer_sRGB.txt"]]`
			`[45:04][win32_handmade.cpp: typedef these WINAPI wgl_ functions and enable the extensions in Win32InitOpenGL]`
Fix some incorrectly converted annotations Also apply some :speech categorisation 2018-03-07 21:48:09 +00:00			`[1:08:48][Q&A][:speech]`
Relocate riscy and add newly converted hero The idea here is to reduce the amount of superfluous stuff downloaded to each server running cinera 2017-12-06 22:26:13 +00:00			`[1:09:10][@yoonfan][Don't you have a race condition according to the C11 and C++11 memory models when you set the texture handle from the worker thread and read it on the rendering thread without any synchronization? I think you need to use an atomic operation or the compiler could mess up the generated code]`
			`[1:10:43][@cubercaleb][Why don't you render directly to the backbuffer at Molly?]`
			`[1:14:20][@brokenopcode][FYI, no you can't change pixel format once it's been set. Need to create a temp window & context, get the wglarb function pointers, then destroy context & window and create new window and context with wglarb. Very annoying but that's how it works on windows as far as I know]`
			`[1:15:09][@Zamar037][Will we be back to the debug code and finish it up after this, or have we finished it now?]`
			`[1:15:23][@cubercaleb][Thanks for the in depth explanation. Will you be going over modern GL later?]`
			`[1:17:15][@garryjohanson][Apparently in DirectX 12 you can select a separate context for different GPUs]`
			`[1:18:10][@gasto5][Where did you upload the 4coder videos?]`
			`[1:18:33][@d7samurai][Yes, D3D11, too]`
			`[1:18:58][@cubercaleb][Couldn't you also use a PBO for streaming in textures?]`
Fix some incorrectly converted annotations Also apply some :speech categorisation 2018-03-07 21:48:09 +00:00			`[1:20:35][Wrap it up][:speech]`
Relocate riscy and add newly converted hero The idea here is to reduce the amount of superfluous stuff downloaded to each server running cinera 2017-12-06 22:26:13 +00:00			`[/video]`