58 lines
4.7 KiB
Plaintext
58 lines
4.7 KiB
Plaintext
[video output=day367 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Enabling OpenGL Multisampling" vod_platform=youtube id=imW4sX3vVwY annotator=Miblo]
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[0:03][Recap and set the stage for the day]
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[2:24][Run the game to demo the Z-fighting and fringing that we need to eliminate]
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[4:51][Consider switching to a different computer with a newer graphics card]
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[6:50][Determine to enable multisampled antialiasing]
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[7:54][handmade_opengl.cpp: Disable the cube texturing and colour the sides of the cubes in a gradient]
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[12:47][Run the game to see our visually parsable cubes]
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[19:04][Run the game to see our green cubes]
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[19:18][Blackboard: Fake Cube Lighting]
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[25:53][Run the game to illustrate areas requiring better lighting]
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[28:53][Blackboard: MSAA (Multisample Antialiasing) + ATC (Alpha to Coverage)]
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[30:04][Blackboard: Aliasing and Apparent Error in Discretizing]
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[34:25][Blackboard: Our current implementation of antialiasing]
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[37:30][Blackboard: Multisample antialiasing on graphics cards]
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[44:09][Blackboard: Typical MSAA pipeline in GPU APIs]
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[49:02][Blackboard: Alpha to Coverage]
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[50:43][Blackboard: Where are the samples?]
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[55:55][Blackboard: Alpha to Coverage continued]
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[57:20][Research OpenGL's specification alpha to coverage]
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[1:05:29][Research glSampleCoverage[ref
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site="Khronos"
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page="glSampleCoverage"
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url="https://www.khronos.org/registry/OpenGL-Refpages/es1.1/xhtml/glSampleCoverage.xml"]]
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[1:08:16][handmade_opengl.cpp: Make OpenGLRenderCommands() enable GL_SAMPLE_ALPHA_TO_COVERAGE, GL_SAMPLE_ALPHA_TO_ONE and GL_MULTISAMPLE]
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[1:10:32][Blackboard: Screen Door Transparency]
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[1:11:57][Research how to set up a buffer suitable for multisampling[ref
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site="docs.GL"
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page="glTexImage2DMultisample"
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url="http://docs.gl/gl3/glTexImage2DMultisample"]]
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[1:23:37][A few words on GPU programming]
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[1:26:41][handmade_opengl.cpp: Make OpenGLRenderCommands() call glTexImage2DMultisample()]
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[1:34:07][handmade_opengl.cpp: Set up for multisampling, based on glcorearb.h[ref
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site="Khronos"
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page="glcorearb.h"
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url="https://www.khronos.org/registry/OpenGL/api/GL/glcorearb.h"]]
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[1:42:20][Step in to OpenGLRenderCommands() to find that our graphics card may not support multisampling[ref
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site="Khronos Wiki"
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page="Multisampling"
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url="https://www.khronos.org/opengl/wiki/Multisampling"]]
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[1:50:46][handmade_opengl.cpp: Make OpenGLRenderCommands() pass MaxSampleCount - 1 to glTexImage2DMultisample(), and step in to find that we have 8x multisampling, but that it is not working properly]
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[2:01:34][handmade_opengl.cpp: Try passing MaxSampleCount to glTexImage2DMultisample(), and run the game to find that it works]
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[2:02:30][Q&A][:speech]
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[2:03:27][@sahfortv][Can you check if the status has changed after updating bind texture?]
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[2:03:53][@randdalf][Did you remember to prefix your glTexImageMultisample2D with a WINAPI) (aka __stdcall prefix)? That's usually the cause of access violations for me]
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[2:05:20][win32_handmade.cpp: Make Win32InitOpenGL call glTexImage2DMultisample()]
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[2:06:37][@macielda][Your glTexParameteri needs to use GL_TEXTURE_2D_MULTISAMPLE instead of GL_TEXTURE_2D]
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[2:08:36][@general1337][Is there a way to debug or have a visual example of the multisampling process?]
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[2:09:03][@mathk_][Maybe we should use glDebugMessageCallback and glEnable(GL_DEBUG_SYNCHRONOUS) sometime, then we can assert in the callback and are able to see just where we gl error in the debugger]
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[2:10:07][@snoringtortoise][You mentioned in a previous episode that one of the reasons for moving to 3D was due to performance concerns with the sorting. Would it have been a viable alternative to keep the sorting results in permanent storage and then each frame only re-sort the entities that have moved? Just considering that many entities like trees and traversables don't move]
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[2:12:29][@macielda][Casey, I have started working on Handmade Vulkan port earlier today, is that okay? I got it to initialize properly and have done some groundwork for outputting rects. My current plan is to work on it this week]
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[2:15:33][@macielda][So Alpha to Coverage does order-independent transparency just like that? Any serious limitations you can think of?]
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[2:17:50][@snoringtortoise][For those of us who are very interested in engine development, what are some of the more advanced platform features that you would recommend investigating?]
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[2:20:17]["The only reason that we ever did it is because Won insisted that we do it"][quote 552]
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[2:21:26][@snoringtortoise][On the platform side like any debugging features, you mentioned a while ago that 1935's engine was light years ahead in that it is far more advanced]
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[2:24:51][@thesizik]["Problem exists between Khronos and Casey"?]
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[2:25:19][Close everything down with a glimpse into the future][:speech]
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[/video]
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