CrossBridge

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| other_names = Project Alchemy

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| developer = Adobe Systems

| released = {{Start date and age|2008||df=yes/no}}

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CrossBridge is an open-source toolset developed by Adobe Systems, that cross-compiles C and C++ code to run in Adobe Flash Player or Adobe AIR.[https://adobe-flash.github.io/crossbridge/ CrossBridge by Adobe], at GitHub Projects compiled with CrossBridge run up to 10 times faster than ActionScript 3 projects.{{cite web |url=http://labs.adobe.com/wiki/index.php/Alchemy:FAQ |title=Alchemy:FAQ |accessdate=May 5, 2012 |url-status=dead |archiveurl=https://web.archive.org/web/20120505202706/http://labs.adobe.com/wiki/index.php/Alchemy%3AFAQ |archivedate=May 5, 2012 }}, Adobe Labs, "ASC performs few optimizations at this time"{{cite web |last=Zotov |first=Peter |url=http://whitequark.org/blog/2012/05/06/reaching-the-limits-of-adobe-stupidity/ |title=Reaching the Limits of Adobe Stupidity – whitespace |publisher=Whitequark.org |date=2012-05-06 |accessdate=2012-10-27 |archive-date=2012-10-15 |archive-url=https://web.archive.org/web/20121015232628/http://whitequark.org/blog/2012/05/06/reaching-the-limits-of-adobe-stupidity/ |url-status=dead }}[http://labs.adobe.com/wiki/index.php/Alchemy:FAQ Alchemy:FAQ] {{webarchive|url=https://web.archive.org/web/20120505202706/http://labs.adobe.com/wiki/index.php/Alchemy%3AFAQ |date=May 5, 2012 }}, Adobe Labs[http://llvm.org/devmtg/2009-10/Petersen_OptimizingActionScriptBytecode.pdf Optimizing ActionScript Bytecode using LLVM], Adobe[http://unitzeroone.com/blog/2008/11/28/adobe-alchemy-is-it-actionscript-heresy/ Adobe Alchemy, is it ActionScript heresy?] {{Webarchive|url=https://web.archive.org/web/20120819072030/http://unitzeroone.com/blog/2008/11/28/adobe-alchemy-is-it-actionscript-heresy/ |date=2012-08-19 }}, Unit Zero One CrossBridge was also known as "Alchemy" and the "Flash Runtime C++ Compiler", or "FlasCC".[http://blogs.adobe.com/labs/archives/2008/11/alchemy_release.html Alchemy Released on Labs], Adobe Blogs, November 17, 2008[http://blogs.adobe.com/labs/archives/2008/12/alchemy_updates.html Alchemy Updates Released on Labs], Adobe Blogs, December 11, 2008[http://blogs.adobe.com/labs/archives/2012/10/project-alchemy-is-now-the-flash-runtime-c-compiler-flascc.html Project “Alchemy” is now the Flash Runtime C++ Compiler (FlasCC)], Adobe Blogs, October 8, 2012

CrossBridge uses high-performance memory-access opcodes in the Flash Player (known as "Domain Memory") to work with in-memory data quickly.[http://gaming.adobe.com/technologies/flascc/ FlasCC for Flash Player], Adobe Gaming {{webarchive |url=https://web.archive.org/web/20130525005202/http://gaming.adobe.com/technologies/flascc/ |date=May 25, 2013 }} CrossBridge uses the LLVM and GCC as compiler backends, in order to compile C++ code, optimize it, and transform it to run within AVM2 (ActionScript Virtual Machine 2). Programs built with CrossBridge are up to 10 times faster than normal ActionScript code, but up to 2× to 10× slower than native C++ code.[http://labs.adobe.com/technologies/alchemy/ Alchemy] {{Webarchive|url=https://web.archive.org/web/20201004192135/https://labs.adobe.com/technologies/alchemy/ |date=2020-10-04 }}, Adobe Labs

CrossBridge can generate Flash Player movies (.swf files), or Flash Libraries (.swc files), which can then be used by larger projects written in ActionScript 3 and compiled using the free Apache Flex SDK (formerly the Adobe Flex SDK). CrossBridge also uses the GPU-based 3D rendering acceleration present in Flash Player 11 (known as Stage3D).[http://gaming.adobe.com/technologies/xc/ XC APIs], Adobe Gaming {{webarchive |url=https://web.archive.org/web/20130425014349/http://gaming.adobe.com/technologies/xc/ |date=April 25, 2013 }}

Using CrossBridge, Adobe ported OpenGL for use within Flash Player Stage3D and released it as an open-source project in 2012.[https://github.com/adobe/GLS3D OpenGL for Stage3D], GitHub project hosting The Lua programming language (version 5.1) was also ported to run in Flash Player using CrossBridge, and released on Google Code.[https://code.google.com/p/lua-alchemy/ lua-alchemy], Port of the Lua programming language for ActionScript using Alchemy, Google Code CrossBridge-compiled projects also enabled running client-side digital signal processing in real-time,[https://temptonik.com/en/news/Temptonik%20Manifesto,589824 Real-time pitch detection in AVM2], Temptonik, January 2015 including fast Fourier transform and Mexican hat wavelet transform.