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Same as the corresponding change in Corrade, this allows each function to explicitly specify its dependencies, making it no longer depending on what a particular Emscripten version decides to include by default, or forcing users to painstakingly fill the EXPORTED_FUNCTIONS array when linking the final executable. It also allows the code to eventually get conditionally included or not with preprocessor branches, for example to not include environment queries for code that won't ever access Node.js console.pull/168/head
Vladimír Vondruš
3 years ago
6 changed files with 277 additions and 165 deletions
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/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, |
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2020, 2021, 2022, 2023 Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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/* JavaScript called by C++ code in EmscriptenApplication and Sdl2Application. |
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Doing it this way instead of having it inline with EM_ASM(), because this |
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provides an actually usable way of expressing dependencies. With EM_ASM() |
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one would instead have to pass |
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-s EXPORTED_FUNCTIONS=[...] |
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to the linker, and OF COURSE there still isn't a way to combine multiple of |
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those together: https://github.com/emscripten-core/emscripten/issues/19058
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Which would mean shifting the burden of specifying all possible exported |
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functions to the end user, which has no way to know if the list is correct |
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until the actual code needing given function gets called! |
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Note: can't use let or const, as that breaks closure compiler: |
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ERROR - [JSC_LANGUAGE_FEATURE] This language feature is only supported for |
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ECMASCRIPT6 mode or better: const declaration. |
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Also, lengthBytesUTF8, stringToUTF8 and UTF8ToString are only made library |
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functions as of https://github.com/emscripten-core/emscripten/pull/19097
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(Emscripten 3.1.35), before that they cause an error if included in __deps. |
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There's (of course, what else to expect) no way to query Emscripten version |
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from within the JS library file, and there's also no useful change in the |
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predefined setting variables between 3.1.34 and 35 I could rely on. Well, |
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except for STRUCT_INFO, which got removed from settings_internal.js in 35, |
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but the dumb-as-a-rock preprocessor in src/parseTools.js doesn't even |
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recognize #ifndef, tells me to use #if if I attempt to use #ifdef, and then |
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while it does what's expected on 3.1.34, on 3.1.35 it fails on |
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ReferenceError: STRUCT_INFO is not defined |
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Ourageously stupid. All of this. So what I do instead is passing this file |
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through configure_file() and replacing MagnumPlatform_EMSCRIPTEN_3135_ONLY |
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with a // on older versions. */
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mergeInto(LibraryManager.library, { |
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/* Used by both EmscriptenApplication and Sdl2Application */ |
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magnumPlatformSetContainerCssClass__deps: [ |
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${MagnumPlatform_EMSCRIPTEN_3135_ONLY} '$UTF8ToString' |
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], |
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magnumPlatformSetContainerCssClass: function(string, size) { |
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/* Handle also the classic #container for backwards compatibility. We |
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also need to preserve the mn-container otherwise next time we'd have |
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no way to look for it anymore. |
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Using UTF8ToString() instead of AsciiToString() as it has an |
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explicit size parameter and thus doesn't need a null-terminated |
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input, which would potentially require yet another allocation. |
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UTF8ToString() is also used elsewhere while AsciiToString() isn't, |
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so even while AsciiToString() is significantly smaller it would |
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still cause the JS to get bigger compared to using UTF8ToString() |
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everywhere. */ |
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(Module['canvas'].closest('.mn-container') || |
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document.getElementById('container')).className = (['mn-container', UTF8ToString(string, size)]).join(' '); |
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}, |
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magnumPlatformSetCursor__deps: [ |
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${MagnumPlatform_EMSCRIPTEN_3135_ONLY} '$UTF8ToString' |
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], |
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magnumPlatformSetCursor: function(string, size) { |
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/* This could again use AsciiToString() but here we can pass explicit |
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size and avoid a length calculation */ |
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Module['canvas'].style.cursor = UTF8ToString(string, size); |
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}, |
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/* Used by EmscriptenApplication only */ |
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magnumPlatformCanvasId__deps: ['malloc', |
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${MagnumPlatform_EMSCRIPTEN_3135_ONLY} '$lengthBytesUTF8', '$stringToUTF8' |
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], |
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magnumPlatformCanvasId: function() { |
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var id = '#' + Module['canvas'].id; |
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var bytes = lengthBytesUTF8(id) + 1; |
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var memory = _malloc(bytes); |
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stringToUTF8(id, memory, bytes); |
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return memory; |
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}, |
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magnumPlatformSetWindowTitle__deps: [ |
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${MagnumPlatform_EMSCRIPTEN_3135_ONLY} '$UTF8ToString' |
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], |
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magnumPlatformSetWindowTitle: function(string, size) { |
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document.title = UTF8ToString(string, size); |
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}, |
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magnumPlatformKeyboardListeningElement__deps: ['malloc', |
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${MagnumPlatform_EMSCRIPTEN_3135_ONLY} '$lengthBytesUTF8', '$stringToUTF8' |
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], |
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magnumPlatformKeyboardListeningElement: function() { |
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var element = Module['keyboardListeningElement'] || document; |
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if(element === document) return 1; /* EMSCRIPTEN_EVENT_TARGET_DOCUMENT */ |
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if(element === window) return 2; /* EMSCRIPTEN_EVENT_TARGET_WINDOW */ |
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if('id' in element) { |
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var id = '#' + element.id; |
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/* This could theoretically also use just stringToAscii(), but |
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as stringToUTF8() is used elsewhere stringToAscii() would still |
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inflate the JS even though it's smaller. */ |
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var bytes = lengthBytesUTF8(id) + 1; |
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var memory = _malloc(bytes); |
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stringToUTF8(id, memory, bytes); |
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return memory; |
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} |
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return 0; |
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}, |
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magnumPlatformRequestAnimationFrame__deps: [ |
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${MagnumPlatform_EMSCRIPTEN_2010_ONLY} '$dynCall' |
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], |
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magnumPlatformRequestAnimationFrame: function(callback, state) { |
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var drawEvent = function() { |
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var id = window.requestAnimationFrame(drawEvent); |
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if(!dynCall('ii', callback, [state])) |
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window.cancelAnimationFrame(id); |
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}; |
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window.requestAnimationFrame(drawEvent); |
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}, |
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}); |
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// kate: hl javascript
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