Webgl Drawarrays



A vertex shader is called a user specified number of times by calling gl. tell WebGL how to pull that data out of your buffers and supply them to a vertex shader. * * * Self-documenting code. In this article, we will carry on where we left off, going further with the same example file and building up a simple shader. WebGL: drawArrays: attribs not setup correctly. js program working where I use two different shaders. Using WebGL®, you can create sophisticated interactive 3D graphics inside web browsers, without plug-ins. This year there will be six (6) sessions covering glTF, WebGL, OpenXR, Vulkan and OpenGL ES. For more details on WebGL context, visit this page. OpenGL, and hence WebGL, is a State Machine. computers will always amaze me, they get better and better and more and more powerful, when will it end. WebGL - Drawing Points. Although the WebGL specification only requires points of size 1, nearly all WebGL implementations allow a much wider range because textured points form the basis of many interesting effects. drawArrays() gl. Tutorial 2: Adding Colors In this post, we'll use the previous tutorial code of drawing a square and add colors to it. On Windows, the reporter's test case works fine, but the mochitest fails on all 3 versions (beta2, 11/03 aurora, 11/05 nightly) : Test passed: `aPosition` should be valid. 谈起WebGL可能有一些人比较陌生,实际上WebGL是一种3D绘图标准,这种绘图技术标准允许把JavaScript和OpenGL ES 2. A WebGL context contains all the WebGL enumerations (such as COLOR_BUFFER_BIT) and APIs (such as drawArrays()). WebGL Scaling in WebGL - WebGL Scaling in WebGL courses with reference manuals and examples pdf. As in, it's so bad I've stopped using Chrome for YouTube. The binding of the buffer to position and color are repeats of the previous code. webglは、osに依存することなくウェブブラウザ上での3dcg表示を可能にします。cpuではなくgpuにて処理を行うため、グラフィックスを高速に描画し. Step 1 − Preparation of the Canvas and Get the WebGL Rendering Context. Step 2 − We need to define the Geometry and Store it in the Buffer Objects. WebGL Pre-Tutorial, Part 2: Drawing a 2d Triangle This part of the pre-tutorial will show you how to write a very basic WebGL program that draws a 2d triangle on the screen. It does this when we call gl. drawArrays(gl. Search for packages, types, and functions. What I want to do is pretty simple, just capture a float value named type and use it for logic operates. tell WebGL how to pull that data out of your buffers and supply them to a vertex shader. After hearing the announcement at SIGGRAPH, I was asking around for someone to write a "basics of WebGL 2" article and Patrick got Shuai involved. WebGL drawArrays JavaScript performance comparison. The OpenGL programmable pipeline. From what I remember when I was doing this sort of thing, the color attachments that we pass have to be in sequence. Drawing a triangle with WebGL You should see a pink canvas above with a cyan triangle in it. Zhenyao Mo. WebGL - Mouse Events August 8, 2013 by admin I extended the Full Screen Quad example to handle mouse location with a little visual feedback when you click and drag. Additionally, you are able to download objects and textures. Professional WebGL Programming is the first book on the market to delve into this fascinating topic and it puts you on your way to mastering the possibilities that exist with WebGL. Canvas is matched to your browser window. WebGL drawArrays JavaScript performance comparison. WebGL – Mouse Events August 8, 2013 by admin I extended the Full Screen Quad example to handle mouse location with a little visual feedback when you click and drag. count − This option specifies the number of elements to be rendered. However, formatting rules can vary widely between applications and fields of interest or study. The time a drawArray call takes is pretty much independent of the number of primitives you're drawing, so calling it 1000 times for 1 point is 1000 times slower than calling it once for 1000 points. The graphics pipeline. 2 Million Swiss Addresses Vizualized” MIKE 2011/10/22 at 21:24. WebGL is a rasterization API that generally runs on your GPU giving you the ability to quickly draw 2D and 3D graphics. In this video, I explain the basics of how WebGL works, and guide you through writing the code to display a. We help tutors and students to connect together without any service charges. The below steps are required to create a WebGL application to scale a triangle. By Nicolas Belmonte Originally published October 17, 2012. There will also be an OpenXR table at VRDC where you can learn more about OpenXR, talk with OpenXR working group members, and learn how your company can implement or join in the development of this important industry standard. As in, it's so bad I've stopped using Chrome for YouTube. 0, exposed through the HTML5 Canvas element as Document Object Model interfaces…WebGL brings plugin-free 3D to the web, implemented right into the browser. WebGL API多数与GPU硬件相关,控制相关图形处理单元,比如说drawArrays不执行,GPU渲染管线的顶点、片元着色器是不会把顶点坐标转化为显示器上的像素显示出来。. drawArrays( gl. Step 2 − Define the Geometry and Store it in the Buffer Objects Since we are drawing three points, we define three vertices with 3D coordinates and store them in buffers. Internet Explorer announced its support with IE 11 with Windows 8. Revision 6 of this test case created by Andor Salga on 2012-4-5. For gcanvas is designed to follow WebGL API, find details of each API in. If I understood correctly, with drawElements I have to use multiple drawcalls if the index array exceeds ~65k elements because of the uInt16 limitation of the indexbuffer ( in webgl ). About the Author Andreas Anyuru is a Senior Member of Technical Staff at ST-Ericsson, specializing in Web Technologies. Note: Citations are based on reference standards. 0 by-sa 版权协议,转载请附上原文出处链接和本声明。. Unfortunately, even the simplest WebGL program is somewhat long and involved. when real A. Preparation code < html lang = "en" > < head. Note that v0, v1, v2 indicates the vertices specified in a buffer object. Control context creation based on system performance. You may have to register before you can post: click the register link above to proceed. If that's all WebGL could do, we'd be pretty boring. The WebGL 2 specification shows differences from the WebGL 1 specification. If you’re reading this any time after October 2016, see his. Because it's already there where WebGL is running, it's very fast and efficient. webglは、osに依存することなくウェブブラウザ上での3dcg表示を可能にします。cpuではなくgpuにて処理を行うため、グラフィックスを高速に描画し. TRIANGLE_FAN, 0, 4 );} 0 1 2 3. TRIANGLES, 0, numItems); The first argument of the drawArrays function specifies the drawing mode. tell WebGL how to pull that data out of your buffers and supply them to a vertex shader. The defaults for translation, rotation and scale are translation = 200, 150, rotation = 0, scale = 1,1 so that's really only translation. Search for packages, types, and functions. WebGL can handle up to 32 textures during any given call to drawing functions (like gl. WebGL Five steps Describe page (HTML file) request WebGL Canvas read in necessary files Define shaders (HTML file) could be done with a separate file (browser dependent) Compute or specify data (JS file) Send data to GPU (JS file) Render data (JS file). and u never know, if skynet 1 day may become reality. WebGL and GLSL •WebGL requires shaders and is based less on a state machine model than a data flow model •Most state variables, attributes and related pre 3. Zhenyao Mo. This guest blog post is by Shuai Shao, a Masters student at UPenn under Patrick Cozzi. js program working where I use two different shaders. TRIANGLE_FAN, vertices. 3D WebGL demonstration tutorial. OK, I Understand. GitHub Gist: instantly share code, notes, and snippets. WebGL is a rasterization API that generally runs on your GPU giving you the ability to quickly draw 2D and 3D graphics. (WebGLで三角形を描画するだけでも数十行コードを書く必要があります。 今回の記事は、上記のポリゴンレンダリングでも使われている、 描画メソッド[gl. If I understood correctly, with drawElements I have to use multiple drawcalls if the index array exceeds ~65k elements because of the uInt16 limitation of the indexbuffer ( in webgl ). webglは、osに依存することなくウェブブラウザ上での3dcg表示を可能にします。cpuではなくgpuにて処理を行うため、グラフィックスを高速に描画し. 4 and Windows 7 64bit on the same versions. Using GLSL we can specify vertex and fragment shaders to have low level control of graphics. and u never know, if skynet 1 day may become reality. computers will always amaze me, they get better and better and more and more powerful, when will it end. OpenGL is a low level library for drawing 2D graphics. N +- Tetrahedral sponge. This post was originally published at WebGL Off the Main Thread. drawElements. My training sessions are in French or in English and I can freely move around the Paris Area in France. Сайт англоязычного оригинала книги находится здесь. POINTS, 1, 1);. Play Underrun – A WebGL shooter in 13kb of JavaScript For this competition I set out to produce something with a dense atmosphere – which is inherently difficult to do with so little space. In this post, I'm going to create a mesh using the Blender 3D modelling tool and load it into my scene. The journey will not be easy, it will take patience and time. It feels something akin to the early days of the web. com/ 32x32 64x64 128x128 C++ 1. WebGL is pretty cool and powerful Three. Array of vertex data. net is your game development community. They are POINTS, LINES, LINE_LOOP, LINE_STRIP, TRIANGLES, TRIANGLE_STRIP, TRIANGLE_FAN. This is done with a WebGL fragment shader, which looks like:. drawArrays several times, the error is as follows:. Until now I had been using drawElements and now I am questioning which is the better choice. Updated data and calls to vertexAttribPointer(). • WebGL is a low-level, rendering API for use within browsers. Note: Citations are based on reference standards. 그러나 특수한 명령을 WebGL에 사용하여 대량으로 렌더링하는 방법입니다. Did you try using a float instead of vec2? By the way, using branches that depend on attributes inside your shader is a major performance hit, I always try to use a mathematical statement instead of branches. Error: WebGL: drawArrays: Drawing to a destination rect smaller than the viewport rect. Finally, you draw the triangle array on the screen. Click To Show Running WebGL. We're happy to announce WebGL in Web Workers in Firefox 44+! Using the new OffscreenCanvas API you can now create a WebGL context off of the main thread. Each piece of depth and color information is combined into a single point, and the collection of points (called a pointcloud) is then rendered into a picture or animation similar to the one shown below. You tell the drawing call drawArrays() from which vertex to start, and how many vertices to draw. In this lesson, we look at the different drawing modes you can use in gl. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. August 9, 2013 by admin. Step 2 − We need to define the Geometry and Store it in the Buffer Objects. Also verified on Mac OS X 10. js file contains functions every webgl program will need a version of one way or another. State Machine. OK, I Understand. There will also be an OpenXR table at VRDC where you can learn more about OpenXR, talk with OpenXR working group members, and learn how your company can implement or join in the development of this important industry standard. This tutorial describes the transform feedback path. WebGL only cares about 2 things. Chrome, Firefox, Internet Explorer, Opera, and Safari are all known to have good WebGL support on both desktop and mobile browsers. WebGL is a graphics API for web browsers. Making a Cone. 4 WebGL Performance Image from http://openglinsights. Revision 6 of this test case created by Andor Salga on 2012-4-5. WebGl 利用drawArrays、drawElements画三角形的更多相关文章. Geometry, colors, etc. 82 ms Chrome 18 27. bufferData() gl. Hi guys, Im trying to do color masking inside webgl and it seems that the way webgl gets composited with the html causes some issues. A: WebGL (Web Graphics Library) is a JavaScript API for rendering interactive 2D and 3D graphics within any compatible web browser without the use of plug-ins. canvas drawImage vs. Kouichi Matsuda, Rodger Lea. Found global-buffer-overflow on webgl drawArrays(). The following code is the content of HelloWorldWebGL. The defaults for translation, rotation and scale are translation = 200, 150, rotation = 0, scale = 1,1 so that's really only translation. So again, you will see only a single point, although this time it is the second vertex coordinates that are shown in the browser: 47 gl. Accepted mode values are: POINTS LINES LINE_LOOP LINE_STRIP TRIANGLES TRIANGLE_STRIP TRIANGLE_FAN void drawElements(ulongmode , count, ulong type , ulong offset ) Render primitives from array data. A vertex buffer is an array of vertices stored in memory on the GPU. At a base level WebGL is an engine that runs 2 user supplied functions on the GPU. It's drawn with WebGL. drawArrays(gl. WebGL is fully supported by Tizen platform. The WebGLRenderingContext. The cube that I've been playing with for the past few posts is going to disappear—as is all of the code that defines its vertices and calculates vertex normal vectors—and be replaced by a simple OBJ. 54 ms x slowdown 14. WebGL is a graphics API for web browsers. At a base level WebGL is an engine that runs 2 user supplied functions on the GPU. drawElements(). 0版本(OpenGL ES 2. WebGLと言えば3Dの高速・美麗な描画ですが、2Dでもその高速な描画は活きてきます。 ちなみに、WebGLでつくられた3Dがどんなものかということが分かる例は以下の記事を覗いてみるといいかもしれません。. numItems); • Now we want our vertices to be interpreted by our shader program as a the vertices of a triangle (gl. This is because you are telling WebGL that you want to start drawing from the second vertex and you only want to draw one vertex. 0 API is also applied to drawArraysInstanced in the WebGL 2. drawArrays () mode − In WebGL, models are drawn using primitive types. Hi, I'm relatively new at WebGL and I'm trying to make my own 2D WebGL framework. Set of video tutorials on programming using WebGL. If I understood correctly, with drawElements I have to use multiple drawcalls if the index array exceeds ~65k elements because of the uInt16 limitation of the indexbuffer ( in webgl ). Graphics programming is a rabbit hole that is infinitely deep. Here is an extension of our JavaScript that initializes WebGL and clears the WebGL canvas with a red color:. For example, this file contains functions for setting up a WebGL context and messages that should be displayed on getting a browser that supports/doesn't support WebGL. drawArrays or gl. Drawing a 3D Scene in JavaScript Using WebGL. This "hello world" takes around 25 lines, and involves lots of concepts like buffers and shaders. In this article, we describe how to use the WEBGL_draw_buffers extension to create a scene with a large number of dynamic lights using a technique called deferred shading. That state is used in the next draw command. 4 and Windows 7 64bit on the same versions. drawArrays(gl. we just have to add the color attributes to osgjs model file for every vertex. Official WebGL public wiki; Excellent lessons. State Machine. If all the names fail, we display an alert to let the user know that the browser does not have WebGL support. WebGL is a powerful tool for adding graphics to your client side web application. drawArrays() use gl. When I try to load the html the cube is not displayed. Before moving further, let us take a relook at the five steps. From what I remember when I was doing this sort of thing, the color attachments that we pass have to be in sequence. WebGL - Khronos is a graphics library for creating 3D visual elements in Web applications without separate plug-ins. Search for packages, types, and functions. As shown in Chapter 2, Rendering Geometry, the framebuffer is the final rendering destination in WebGL. js hosted with by GitHub. frontface() getBufferParameter() getRenderbufferParameter() 要获得这个接口的对象,可以通过在 canvas元素上调用 getContext() 函数,调用时传入 “webgl” 参数:. Post-processing with WebGL. Here you will find various tutorials and information on using the LWJGL library. If you’re interested in learning WebGL, these posts will take you from zero to a working 3D application, with an emphasis on how the various concepts work and why. drawElements, and gl. drawArrays(gl. uniformMatrix4fv is invoked again to load animationMatrix, the matrix dependant on the slider position, into the modelViewMatrix uniform. A: WebGL (Web Graphics Library) is a JavaScript API for rendering interactive 2D and 3D graphics within any compatible web browser without the use of plug-ins. Ive downloaded the first lesson from learningwebgl. University of Pennsylvania Output is “1WebGLtrue” * * Anonymous functions are also in C#, etc. com yesterday and was quite amused by the concept: Use 1024 bytes or less of javascript in a minimalistic shell page to create a cool demo. In this lesson, we look at the different drawing modes you can use in gl. drawElements vs drawArrays in webgl. This is done with a WebGL fragment shader, which looks like:. WebGL Programming Guide: Interactive 3D Graphics Programming with WebGL. Please take a look at the following code. The range checking specified for drawArrays in the WebGL 1. 4 and Windows 7 64bit on the same versions. POINTS, 0, 1) You received this message because you are subscribed to the Google Groups "WebGL Dev List" group. Everything you need to know about developing hardware-accelerated 3D graphics with WebGL!. We have explained the process in five steps. WebGL exposes the GPU so that complex 2D and 3D scenes can be rendered with high performance on most modern hardware. The WebGL method gl. WebGL is a cross-platform, royalty-free web standard for a low-level 3D graphics API based on OpenGL ES 2. While this feature works as expected in Chrome and Firefox, we are facing several issues in safari. WebGL drawArrays JavaScript performance comparison. LINES using WebGL, means multiple seperated line segments. JavaScript code sends commands and data to the GPU via WebGL gl. The below steps are required to create a WebGL application to scale a triangle. Because it's already there where WebGL is running, it's very fast and efficient. Error: WebGL: drawArrays: Drawing to a destination rect smaller than the viewport rect. A simple render It's time to finally start drawing something - and let's make it easy today. 0 that is exposed through a JavaScript API. By learning OpenGL, you've decided that you want to do all of the hard work yourself. js program working where I use two different shaders. It does this when we call gl. Consider everything that you need to set up to show any geometry in WebGL: You need to set up the shaders, compile the shaders, activate the shaders, define the verticies, push them into a buffer, bind the vertex buffer pointers, and finally draw the arrays. • WebGL is a low-level, rendering API for use within browsers. TRIANGLE_FAN, vertices. The output of getAttribLocation is meaningful, all of them are equal greater than 0. drawElements and. This tutorial describes the transform feedback path. Chrome, Firefox, Internet Explorer, Opera, and Safari are all known to have good WebGL support on both desktop and mobile browsers. drawElements()对比 2016年12月13日 08:25:17 黄飞鸿123456 阅读数 6926 版权声明:本文为博主原创文章,遵循 CC 4. drawArrays vs drawElements So I was checking out c3dl and they exclusively use drawArrays in their engine. It seems there's so much potential for creating the types of visualizations that were, until recently, only possible in monolithic C++ or Java applications. How to load an image in WebGL Above you should see a picture of me. bufferData() gl. It looks weird, not because I look weird but because the RGB channels are swapped. Found global-buffer-overflow on webgl drawArrays(). Here you will find various tutorials and information on using the LWJGL library. WebGL 2 is not entirely backwards compatible with WebGL 1. numItems); • Now we want our vertices to be interpreted by our shader program as a the vertices of a triangle (gl. Please see this makimenko/angular-template-for-threejs#9. For whatever reason, watching YouTube in Chrome sucks. WebGL is like OpenGL ES 2. drawArrays several times, the error is as follows:. もちろん、WebGL もこの canvas を利用することになるので ピーエムシー PMC スロットルワイヤ-セット(G02) FCR37φTX650/75 14-13755/1 HD店、WebGL を記述する前に canvas タグについて簡単に解説します。. This allows rendering to progress. WebGL API多数与GPU硬件相关,控制相关图形处理单元,比如说drawArrays不执行,GPU渲染管线的顶点、片元着色器是不会把顶点坐标转化为显示器上的像素显示出来。. 22mm 22mm 防爆シノ付キラチェットレンチ Ampco CR0022B CR0022B,【代引不可】ユタカメイク:オーダー簡易間仕切りカラーターポリン グリーン 厚み0. They are POINTS, LINES, LINE_LOOP, LINE_STRIP, TRIANGLES, TRIANGLE_STRIP, TRIANGLE_FAN. 0, and provides similar rendering functionality, but in an HTML context. WebGL and GLSL •WebGL requires shaders and is based less on a state machine model than a data flow model •Most state variables, attributes and related pre 3. WebGL brings hardware-accelerated 3D graphics to the web. You tell the drawing call drawArrays() from which vertex to start, and how many vertices to draw. 1 API and shader compatibility – to enable the easy development and execution of the latest OpenGL ES applications on desktop systems. Until now I had been using drawElements and now I am questioning which is the better choice. Getting Started with StageGL May 8, 2017 25 Comments Articles EaselJS , faq , getting started , StageGL , WebGL Recently, we announced a public preview of StageGL , which offers a new way to create blazingly fast experiences with EaselJS. Preparation code. drawElementsを使った手法 ・gl. The WebGL™ context is still being developed and has not been standardized. js Create a Canvas. Graphics programming is equal parts physics (how do I accurately model the physical phenomina that I am seeing) and computer science (how do I calculate all this math and still hit 16. WebGLの基礎を動画で学ぶ eggheadの動画講座では全10回・48分4秒でWebGLの基礎を学ぶことができます。早速やってみました. Error: WebGL: Exceeded 16 live WebGL contexts for this principal, losing the least recently used one. Clipspace coordinates in 2D and colors. A vertex shader is called a user specified number of times by calling gl. Let me explain. Error: WebGL: Requested size 1280x703 was too large, but resize to 640x351 succeeded. Today we continue HTML5 canvas examples. 2 Million Swiss Addresses Vizualized” MIKE 2011/10/22 at 21:24. WebGL brings hardware-accelerated 3D graphics to the web. First example, Hello Triangle! Prerequisites: Enabling WebGL on your browser. drawArrays(…) just reads the values as take come from the buffer. 00:14 We do that with vertex buffers. It is supported by majority of the desktop and mobile browsers. You need to repeat these steps every time you draw a new shape. We provide a vertex shader what outputs clip space coordinates and then, based on the first argument to gl. Недавно вышел перевод книги WebGL Programming Guide: Interactive 3D Graphics Programming with WebGL. もちろん、WebGL もこの canvas を利用することになるので ピーエムシー PMC スロットルワイヤ-セット(G02) FCR37φTX650/75 14-13755/1 HD店、WebGL を記述する前に canvas タグについて簡単に解説します。. The WebGLRenderingContext. Drawing a triangle with WebGL You should see a pink canvas above with a cyan triangle in it. The WebGL™ context is still being developed and has not been standardized. 1 Introduction to Computer Graphics with WebGL Ed Ange l Professor Emeritus of Computer Science Founding Director, Arts, Research, Technology and Science Laboratory. 0 API is also applied to drawArraysInstanced in the WebGL 2. uniformMatrix4fv is invoked again to load animationMatrix, the matrix dependant on the slider position, into the modelViewMatrix uniform. WebGL will automatically extract them and pack them into a variable of type vec2 that goes into the shader. If that's all WebGL could do, we'd be pretty boring. For each input vertex Try to find a similar ( = same for all attributes ) vertex between all those we already output If found : A similar vertex is already in the VBO, use it instead !. After hearing the announcement at SIGGRAPH, I was asking around for someone to write a “basics of WebGL 2” article and Patrick got Shuai involved. I'm not sure whether this is actually the security issue, but I'm reporting in as the security just in case (Yeah. Preparation code. If all the names fail, we display an alert to let the user know that the browser does not have WebGL support. Assuming that gl is our WebGL context, every call to gl. Setup geometry. Pure WebGL vs. The only kind of indexing expression allowed is one involving constants and loop indices. WebGL - Interleaved Vertex Buffer. Ive downloaded the first lesson from learningwebgl. However, formatting rules can vary widely between applications and fields of interest or study. The cube that I’ve been playing with for the past few posts is going to disappear—as is all of the code that defines its vertices and calculates vertex normal vectors—and be replaced by a simple OBJ loader. There will also be an OpenXR table at VRDC where you can learn more about OpenXR, talk with OpenXR working group members, and learn how your company can implement or join in the development of this important industry standard. 00:14 We do that with vertex buffers. Or the texture is Float or Half Float type with linear filtering while OES_float_linear or OES_half_float_linear extension is not enabled. The cube that I’ve been playing with for the past few posts is going to disappear—as is all of the code that defines its vertices and calculates vertex normal vectors—and be replaced by a simple OBJ. So again, you will see only a single point, although this time it is the second vertex coordinates that are shown in the browser: 47 gl. Updated data and calls to vertexAttribPointer(). OK, I Understand. If you enable all the attributes, but your program doesn't actually use an enabled attribute, WebGL doesn't care how big the array is that's associated with it (so you won't get any out-of-bounds errors). WebGL is fully supported by Tizen platform. 0, exposed through the HTML5 Canvas element as Document Object Model interfaces…WebGL brings plugin-free 3D to the web, implemented right into the browser. WebGL and GLSL Basics CS559 - Fall 2016 In JavaScript using WebGL… The beginning. 2 Million Swiss Addresses Vizualized" MIKE 2011/10/22 at 21:24. I am trying to get a three. Get a WebGL context. OK, I Understand. I was one of them who pre-ordered the 1. It has a long history. TRIANGLE_FAN, vertices. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. 谈起WebGL可能有一些人比较陌生,实际上WebGL是一种3D绘图标准,这种绘图技术标准允许把JavaScript和OpenGL ES 2. So, every time that the KinectWebGLHelper object receives a valid image frame from the KinectSensor object, it calls the ImageMetadata. WebGl 利用drawArrays、drawElements画三角形的更多相关文章. Set of video tutorials on programming using WebGL. This example was not made by me, but by doing a little modification it can show my problem. Revision 6 of this test case created by Andor Salga on 2012-4-5. Graphics programming is a rabbit hole that is infinitely deep. My last problem is when I try to use a texture (for example a PGraphics of PImage) to use it as parameters f…. This post was originally published at WebGL Off the Main Thread. TRIANGLE_FAN, offset, vertexCount); There's one more thing to note here: there's an order to the vertices. From what I remember when I was doing this sort of thing, the color attachments that we pass have to be in sequence. It is constant over the "drawArrays" call. WebGL is then initialized by retrieving a WebGL object on the basis of the canvas, which can then be used for further WebGL operations. drawElements()对比 2016年12月13日 08:25:17 黄飞鸿123456 阅读数 6926 版权声明:本文为博主原创文章,遵循 CC 4. Get a WebGL context. Readbacks kill performance.