The Power of WebGL - Hackeando sua GPU com JavaScript

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The Power of WebGL @raphamundi HACKING YOUR GPU WITH JAVASCRIPT

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RAPHAEL AMORIM raphamundi raphamorim raphamorim.com

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Shaders

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Graphic procedures e.g: surfacing and texturing, lighting and shadowing, texture and geometry generation.

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The "3D" Effect * A thanks Jaume Sanchez for the awesome resource!

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[ -1, -1, 0 ], [ 1, -1, 0 ], [ 1, 1, 0 ], [ -1, 1, 0 ]

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Vertex shader takes this data, and some other values (model-view and projection matrix, and others) and turns the 4 points into 4 projected points

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We need to specify how to draw it: points, wireframe or solid

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The solid projected square gets "discretised" base on the output display

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The system ﬁlls the space connecting these dots and calculates what pixels on your display need to be drawn

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The rest is up to the fragment shader It gets called for each of these small squares, and the correct output color is calculated.

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GPU Graphics Processing Unit

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GPU Run! Run! As fast as you can!

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WebGL Web Graphics Library

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WebGL Context Deﬁne the Geometry and Store it in the Buffer Objects Create and Compile the Shaders ( Vertex && Fragment )

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Atributes

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Atributes Uniforms

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Atributes Uniforms Varyings

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WebGL Water http://madebyevan.com/webgl-water/

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WebGL Blossom http://www.bongiovi.tw/experiments/ webgl/blossom/

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Google Maps Cube http://www.playmapscube.com/

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WebGL is very hot Damn God! “ ”

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~= 80ºC!!!

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~= 80ºC!!! WebGL makes your macbook hot. Yeah, literally.

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FPS Frame Per Second

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Where are the graphics costs?

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The ﬁrst rule of any optimization is to ﬁnd where the performance problem is.

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Strategies for optimizing for GPU vs. CPU are quite different.

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CPU optimization

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GPU: Optimizing Model Geometry

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GPU: Texture Compression and Mipmaps

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DrawCalls

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WebVR Bringing Virtual Reality to the Web

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Okay, we already tried a lot.

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till now:

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WebVR is an API http://mzl.la/1IK6pnf

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WebVR • Sechelt (http://mozvr.com/projects/sechelt/) • Quake III (http://media.tojicode.com/q3bsp/) • vizor.io (http://vizor.io/fthr/vr_cube/edit) • Primoseeditor (https://www.primroseeditor.com/#fullscreen) • Inspirit (http://inspirit.unboring.net/)

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MozVR mozvr.com

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bit.ly/1lDsdLR

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Thanks! :)

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References: • Shaders! What are they and what can they do for me? -   Jaume Sanchez (https://www.clicktorelease.com/talks/ scotlandjs-2015/) • Dive into 0.016 seconds of WebGL - @yomotsu (https:// speakerdeck.com/yomotsu/dive-into-0-dot-016-seconds-of-webgl) • Getting started with three.js and WebGL -   Jaume Sanchez (https://www.clicktorelease.com/talks/ jsconfbp-2015/)

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References: • The Road To WebVR • Replacing reality with JavaScript -   Jaume Sanchez (https://www.clicktorelease.com/talks/ fullstackfest-2015/slides/#0) • WebGL tutorial MDN (https://developer.mozilla.org/en-US/docs/ Web/API/WebGL_API/Tutorial) • The Rise and Fall and Rise of Virtual Reality (http:// www.theverge.com/a/virtual-reality/oral_history)

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References: • 6 Virtual Reality Devices From the Past (http:// www.cheatsheet.com/technology/a-trip-down-virtual-reality-road-6- systems-of-the-past.html )