WebGLRenderer: Defer blocking queries against WebGLPrograms after linking. #19745
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This was referenced Jun 29, 2020
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Review ping? |
Mugen87
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Mugen87
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Thanks for the feedback! Addressed all comments. |
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I've tested your branch locally and it seems the |
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I'll look into it, thanks! |
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Fixed. Explanation above. |
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Program linking can happen asynchronously, but is forced to block and wait for completion the first time information about that program is queried after linking. This includes calls to getAttribLocation/getUniformLocation/getUniform/getProgramParameter/getProgramLogInfo, etc. This change defers most of those calls until the first time until the first time that they're actually needed by the page, which can allow the program linker time to complete and thus reduce blocking, especially when used in conjuntion with renderer.compile(). It's worth noting that many materials are initialized the first time they are encountered by the render loop and then immediately used for rendering, which negates most of the benefit that this could otherwise provide, but it lays the groundwork for more efficient patterns in the future and can significantly help classes like PMREMGenerator that are already using renderer.compile() internally.
📦 Bundle sizeFull ESM build, minified and gzipped.
🌳 Bundle size after tree-shakingMinimal build including a renderer, camera, empty scene, and dependencies.
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Rebased to resolve merge conflicts after discussion kicked up on #19752 again. |
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Since I think Ricardo feels positive about this change and supporting |
Mugen87
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Thank you! |
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Program linking can happen asynchronously, but is forced to block and wait for completion the first time information about that program is queried after linking. This includes calls to
getAttribLocation/getUniformLocation/getUniform/getProgramParameter/getProgramLogInfo, etc.This change defers most of those calls until the first time until the first time that they're actually needed by the page, which can allow the browser time to complete linking asynchronously and thus reduce blocking, especially when used in conjunction with
renderer.compile().It's worth noting that many materials are initialized the first time they are encountered by the render loop and then immediately used for rendering, which negates most of the benefit that this could otherwise provide, but it lays the groundwork for more efficient patterns in the future and can significantly help classes like
PMREMGeneratorthat are already usingrenderer.compile()internally.The ideal endpoint is for Three to start taking advantage of KHR_parallel_shader_compile as proposed by #16321 and #16662. This is just a lower-impact stepping stone along the way.