Webgl Buffer

Once to render to the texture and again to render to the canvas. LINES, 16, gl. 0 基础学习 WebGL 该看的 3 本书 - 黑客与画家 - 知乎专栏 WebGL 是以 OpenGL ES 2. WebGL A Beginner's Guide to Coding Graphics Shaders: Part 3 Having mastered the basics of shaders, we take a hands-on approach to harnessing the power of the GPU to create realistic, dynamic lighting. 0a1 (2012-12-28) OSX Expected results: Validation should succeed regardless of attribute buffer size, since the index buffer uses only the first 3 elements. A shader program are written in GLSL (Graphics Library Shader Language). This year there will be six (6) sessions covering glTF, WebGL, OpenXR, Vulkan and OpenGL ES. Usually the depth buffer allows to reject enough “far” fragments, but here, you explicitly sorted them, so the depth buffer is actually useless. Because you are using a buffer object to pass multiple vertices to a vertex shader in initVertexBuffers(), you need to specify the number of vertices in the object as the third parameter of gl. We do that as follows. The WEBGL_draw_buffers extension is part of the WebGL API and enables a fragment shader to write to several textures, which is useful for deferred shading, for example. This leads to a potentially exploitable crash. A simple render It's time to finally start drawing something - and let's make it easy today. PIXEL_UNPACK_BUFFER. Enter the DEPTH BUFFER. IEWebGL plugin is developed to make possible for web developers to use same technologies and same project code base for all platforms. The following WebGL-specific behavioral changes apply: The sized internal format RGB16F is not color-renderable in this extension. bufferData copies data into the buffer. The essential tutorial. WebGL Graphics. is "OpenGL for the Web," enabling GPU-accelerated 3D graphics on web pages. When I click on it I get "success" sometimes and sometimes I get nothing. A bit more … https://developer. UNIFORM_BUFFER, gl. EXT_color_buffer_float is the WebGL 2 extension. OpenGL, OpenGL ES, and WebGL community experiences. I think it's a good time to actually do something physical on the screen. This extension exposes the EXT_color_buffer_float functionality to WebGL. Uniform Buffer Objects attempts to streamline this process by allowing you to store blocks of uniforms in buffers stored on the GPU (like vertex/index buffers). A buffer is a kind of array keeping data in the JS script. However, there might be some effects that require read access to the front buffer. WebGL as a State Machine: Buffer Manipulation When dealing with buffers for the getParameter , getBufferParameter , and isBuffer functions, new information about the state of the rendering pipeline becomes available to us. You do this by creating buffer objects and loading data into them. WebGL (Web Graphics Library) is a JavaScript API for rendering interactive 3D computer graphics and 2D graphics within any compatible web browser without the use of plug-ins. That would use 2 buffers. It reads in the three state textures (nearest filtering of course, wouldn't make sense otherwise) and performs a simulation step. bindBuffer() n Specify the target (i. A bit more … https://developer. arraycopy() to move the data around, and to keep. So, every time that the KinectWebGLHelper object receives a valid image frame from the KinectSensor object, it calls the ImageMetadata. I am currently looking into glTF to use as a transfer format for my WebGL project. GitHub Gist: instantly share code, notes, and snippets. Memory settings for WebGL content: Array Buffer Allocation Failed vs. 5 and were discussed briefly in Subsection 3. EDIT: This too seems to be just another browser's way of saying "Array buffer allocation failed", as evidenced by the fact that UnityLoader. Gopherjs binding to the webgl context. Frame buffer is a portion of graphics memory that hold the scene data. These samples attempt to draw as many 32x32 images as possible at 60 frames a second using various techniques. The game can write to these buffers using the push_quad() and push_light() functions. You do this by creating buffer objects and loading data into them. Then it writes the results back to the corresponding framebuffers, all at once thanks to the webgl_draw_buffers extension. This online community is the place to go if you have questions on how to use your Tizen device. I am able to access my browser but I get the above message. A lot of people also seem focused on. The uniform buffers bible can be found here: GL_ARB_uniform_buffer_object. resize(width, height) Resizes the drawing buffer of a WebGL rendering context. When we use raster as a source of 3D rendering, in accordance with the size of raster data, the length of the data can be stretched from tens of thousands to hundreds of thousands. This is a difference in functionality compared to the EXT_color_buffer_half_float extension. Currently, I have a position vertex buffer, a texture coordinate buffer, and a normals buffer. A frame buffer that contains a color buffer and a depth buffer is automatically created by WebGL when its context is created. Thankfully, this is a pretty trivial step and it will be explained in more detail further. Some of these program components may be embedded in one file, some of them may be in separate files. In this step, we obtain the WebGL Rendering context object using getContext(). WebGL_color_buffer_float is the WebGL 1 extension. We will also show how to override hitTest() so that the user will be able to interact with the features displayed by the custom view. A data buffer is a region of a memory used to temporarily store data while it is being moved from one place to another. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug. vertexAttribPointer()将缓冲区数据分配给GLSL中的变量. You can’t bind DOM events inside canvas. Help->About says Firefox is up to date but I get the banner notification: For a better experience on Facebook, update your browser. This object interacts with the WebGL drawing buffer and can call all the. The Z buffer doesn't work for transparent polygons. Frame buffer objects can be safely copied or transferred between worker threads, and can be either garbage collected or reused for another frame after output. Step 2 − Define the Geometry and Store it in Buffer Objects As we are drawing a triangle with indices, we requireto pass the three vertices of the triangle, along with the indices, and preserve them in the buffers. おやまだ あきひろ 小山田 晃浩 [email protected] 株式会社ピクセルグリッド Microsoft MVP for IESaturday, September 8, 12 3. Editor's Draft: Updated definition for WebGL 2. drawArrays() so that WebGL then knows to draw a shape using all the vertices in the buffer object. The bots are expected to generally stay green, so it should be easy to spot failures. Security researcher Aki Helin used the Address Sanitizer tool to find a buffer overflow write when rendering some WebGL content. Note: this is alpha software - if you find bugs, let me know (or better yet, fork and fix them!. This is because the shaders require the input variables to be set appropriately. WebGL has an edge over 2D canvas performance wise, however, since you are dealing with video then the question would be if there is any point using WebGL. I've read all unity answers threads I could find on the topic of WebGL Build memory size, but I have some questions. Over the last 2 or 3 days Firefox is suddenly plagued by the "Performing TLS Handshake" delay which makes it near impossible to use. Frame buffer is a portion of graphics memory that hold the scene data. WebGL bindings for node. If you are interested in WebGL 1. It takes a long time for a Web Scene to open in CityEngine Web Viewer. I've tried using a stencil buffer techique with glLineWidth and glPolygonMode. The WebGLRenderingContext. js and sending them to the to the server for rendering to video. Designed solely with the intention of testing packages that interact with WebGL buffers. 0 features like uniform buffers can save a lot of CPU usage. But since WebGL has to clear the content to zero anyway it's probably better to pre-allocate several buffers and do the rotation myself. •In GLSL for WebGL we must specify desired (gl. The WebGL extension WEBGL_color_buffer_float may be implemented (currently in draft status). It’s drawn with WebGL. I am able to access my browser but I get the above message. This is usually done at initialization time. WebGL is an offspring of OpenGL that executes in all modern web browsers, including web browsers on tablets and phones. Specifying the colors of the pyramid's sides The next low-level buffer that must be set up is referenced by colorBuffer. Step 3 − Create and Compile the Shader Programs. Tizen User Community We recently launched a new forum for you to share feedback and connect with other owners of Tizen devices. ARRAY_BUFFER, new Float32Array(arr),. org for more info Clicking on the…. Note: this is alpha software - if you find bugs, let me know (or better yet, fork and fix them!. Attaching Buffers to Shader Programs Once a buffer is loaded with data, it must be attached to the correct input in your shader program. The reason why you are getting a blank page is because the canvas drawing buffer is empty at the moment of the image capture. bindBuffer() n Specify the target (i. LINES using WebGL, means multiple seperated line segments. Diese müssen mit Hilfe dafür. The highlighted lines have. Finally, we call the WebGL drawArrays() method to draw the square. This book will teach you to exploit the full potential of WebGL in game development by rendering complex 3D objects. Specifying the colors of the pyramid's sides The next low-level buffer that must be set up is referenced by colorBuffer. WebGL Beginner's Guide - Chapter 8 Basic Picking You haven't selected anything yet. Since we are drawing a triangle, we have to pass three vertices of the triangle, and store them in buffers. WebGL require a shader program for the vertex and fragment manipulation sections of the graphics pipeline. 13] Data is transferred to WebGL using ArrayBuffer and views. It's probably not something you should be using in an actual app/demo, so approach with caution. -- ANGLE (NVIDIA GeForce GTX 1070 Direct3D11 vs_5_0 ps_5_0). Knowing this a typical WebGL program basically follows this structure. We provide simple and very small WebGLHelper. We do that as follows. The WEBGL_color_buffer_float extension is part of the WebGL API and adds the ability to render to 32-bit floating-point color buffers. 0 The definition of 'bindBuffer' in that specification. Still I was getting 60 FPS on Linux Chrome in a VM as well. In these buffer objects, we will be able to store data of the model that we want to draw, corresponding to the vertices, indices, color, etc. Chapter 3: Index Buffer Objects and Primitive Types. It has been quite a journey but OpenGL Insights is about to be available everywhere, just in time for Siggraph 2012 and the OpenGL 20th anniversary where copies of the book will be given away during the WebGL, the OpenGL ES and the OpenGL BOFs. Mozilla has a working implementation of this spec, and they have successfully been running Unity WebGL content with multithreading enabled. The game can write to these buffers using the push_quad() and push_light() functions. The layout of the buffer makes efficient use of the sparse triangle strip position by reusing data. These numbers can represent vertex positions, colors, or anything else that we need. You do this by creating buffer objects and loading data into them. 0 is now being supported by most browsers but requires a better GPU so may not run on older computers or on most cell phones and tablets. This extension exposes the EXT_color_buffer_float functionality to WebGL. Buffer geometry cubes worth a try to retain the look of the original. WebGL require a shader program for the vertex and fragment manipulation sections of the graphics pipeline. All bots on the GPU waterfall run the WebGL conformance suite under the step named, creatively enough, webgl_conformance_tests. 0 beta OSX Firefox nightly 20. WebGL supports floating-point textures as an extension Every texel can store one or more floating-point values Because GPU can operate on so much floating-point data at once, it is possible to perform advanced techniques in WebGL such as physical simulation. You call drawXXX once for each thing you want to draw each time you want to draw it. To assign the buffer object to the attribute variable, WebGL provides a method called vertexAttribPointer(). WebGL Dev List. Out of Memory Exception I am struggling with choosing the right memory size for my WebGL game Silly World Series. As a suggestion I'd recommend adding a 'null check' to the c++ code that the javascript is generated from (in the function getFileDataAsTypedArray). How to enable WebGL in Internet Explorer 11 Windows Blue , the first major upgrade for Windows 8 , will most likely pack the final version of Internet Explorer 11, the next important release of Microsoft's in-house browser that's reportedly under development right now. PIXEL_PACK_BUFFER, gl. This example shows how to use the precompose and postcompose rendering hooks to clip layers using WebGL. The stencil buffer is an optional extension of the depth buffer that gives you more control over the question of which fragments should be drawn and which shouldn't. WebGL simulates this behaviour using a depth buffer. This year there will be six (6) sessions covering glTF, WebGL, OpenXR, Vulkan and OpenGL ES. WebGL_color_buffer_float is the WebGL 1 extension. Create the WebGL context. In a nutshell, WEBGL_depth_texture gives you easy access to the depth buffer. html]-A slightly more complicated WebGL program - draw a square composed of 2 triangles. The draw call does not change either, you just have to set the right number of vertices that must be drawn :. After drawing or updating a buffer, you don't necessarily have to unbind it, though it might be a good idea to do so to avoid accidental writes to buffers that were left bound. com @pjcozzi. Tizen User Community We recently launched a new forum for you to share feedback and connect with other owners of Tizen devices. org/en-US/docs/Web/API/WebGL_API/Tutorial/Adding_2D_content_to_a_WebGL_context. js Sorry, these slides require a browser that supports WebGL Peter O'Shaughnessy, Future Technologies, Pearson. HTML preprocessors can make writing HTML more powerful or convenient. See Custom WebGL layer view for a discussion of this technique. drawElements(gl. The scene should include animation, lighting, textures, frame buffers and multiple objects. There are quite a few points to understand to manipulate the stencil buffer correctly, so let's take time to learn them. -A very simple WebGL program that does nothing but opens a canvas and clear it in yellow [code00. A WebGLBuffer storing data such as vertices or colors. Using WebGL®, you can create sophisticated interactive 3D graphics inside web browsers, without plug-ins. WebGL runs on the GPU on your computer. I've added two separate "ready" variables: one for when the image is ready, and one for the model. Each shader must be then bound to its respective array buffer gl. I do not use firefox to run WebGL (but my Web Player run normally on firefox) I already reduce WebGLMemorySize to 16MB (avoid fragment problem), but open game many time => Array buffer allocation failed My game work fine on 64bit system (with 8G ram) This issue occur on 32bit system (with 2G ram). IEWebGL plugin is developed to make possible for web developers to use same technologies and same project code base for all platforms. To use WebGL, the author must obtain a WebGL rendering context for a given HTMLCanvasElement. WebGL / sdk / tests / conformance2 / buffers / uniform-buffers. createBuffer creates a buffer. x value We prepare 2 buffers, create TransformFeedback object and call draw(). No Need to Swap Buffers in WebGL. 可见,这个过程和刚才WebGL调用的方式几乎一模一样,只是把所需要的参数都封装了一下,并将调用函数的返回值,作为属性保存在该Buffer对象中。 于是,一个过程式的函数调用封装成了一个Ojbect,即可以重用,也方便内部细节的管理。. Beware of the Node. The WebGLRenderingContext. The scene should include animation, lighting, textures, frame buffers and multiple objects. Setting shader program uniforms is a huge part of almost any WebGL/OpenGL draw loop. This means that if your shader uses 16 matrices, you will call WebGL API 16 times to update all matrices before using your shader. There's one small optimization to this. createBuffer() n This function returns an identifier for the buffer object n Step 2: Bind the buffer with a particular buffer type with gl. OpenGL ES 2 maps to WebGL 1, whereas OpenGL ES 3 maps to WebGL 2. For MRT we used the WEBGL_draw_buffers extension as a work-around to write g-buffers in a single pass. Because I don’t see any useful application for single buffering I would claim that double buffering is always enabled. Thisis the only introduction to computer graphics text for undergraduates that fully integrates WebGL and emphasizes application-based programming. The order of vertices affects the drawing of the shape. Out of Memory Exception Question I didn't find anything in the subreddit rules about this, but I hope it's okay if I paste the content of my Unity Answers post here. This is a difference in functionality compared to the EXT_color_buffer_half_float extension. I am quite new with OpenGL, but if I understand right, these extensions are quite old and even already included in the core functionality. WEBGL_draw_buffers isn’t showing up on that page and on the second tab it says × This browser does not support WebGL 2. Step 3 − Create and Compile the Shader Programs. As usual, X is right in the plane of the texture, Y is up (again in the plane of the texture), thus given the right hand rule Z point to the “outside” of the plane of the texture. wasm file in order to generate this webgl_water_tutorial. Department of Informatics, Athens University of Economics & Business. ANGLEs users WebGL Support Chrome, Firefox Shading Language Validation Chrome, Firefox, Safari Windows, MacOS, Linux, mobile Portability Qt, other projects. This book will teach you to exploit the full potential of WebGL in game development by rendering complex 3D objects. The OpenGL buffer is created, bound, filled and configured with the standard functions (glGenBuffers, glBindBuffer, glBufferData, glVertexAttribPointer) ; see Tutorial 2 for a quick reminder. In OpenGL, it is not required to do as it has a lot of features like geometry and shaders. Note that v0, v1, v2 indicates the vertices specified in a buffer object. WebGL state tracking code is getting confused into believing that there is an element array buffer bound (mBoundElementArrayBuffer is non-null) when there really isn’t. It is displayed in a window or fullscreen, depending on your platform. GitHub Gist: instantly share code, notes, and snippets. WebGL meshes are drawings based on points in 2d or 3d space, called vertices. WebGL Example. When it's bound, any call to a function will operate on this buffer and this is what happens when we invoke bufferData. These are a set of articles that teach WebGL from basic principles. bufferData函数包含三个参数, 第一个参数为webgl. I am exporting from Flash to WebGL, which is awesome, but it doesnt allow for the background (stage) color to be removed. To use WebGL, the author must obtain a WebGL rendering context for a given HTMLCanvasElement. In my last update, I discussed using Socket. Step 2 − Define the Geometry and Store it in the Buffer Objects. The depth buffer helps you know when something is behind or in front of something else. 2, but that's because shaders were only introduced in OpenGL 2. ARRAY_BUFFER, gl. This book will teach you to exploit the full potential of WebGL in game development by rendering complex 3D objects. js]-A modified code01. Showing 1-20 of 776 topics. OpenGL compute shaders are GLSL and similar to other shaders: you can read textures, images, and buffers and write images and buffers. Gopherjs binding to the webgl context. No Need to Swap Buffers in WebGL. 1 has also been extended to provide opaque multiview framebuffer support, with corresponding views / viewports. These samples attempt to draw as many 32x32 images as possible at 60 frames a second using various techniques. So if a cube needs positions, normals, and texture coords it would use 3 buffers. The bots are expected to generally stay green, so it should be easy to spot failures. Uniform Buffer Objects (or UBO in short) have been introduced with OpenGL 3. 13] Data is transferred to WebGL using ArrayBuffer and views. This is a Node. For example: [ // vertex buffer 0,0,0, 0,1,0, 1,0,0, 1,1,0, ] And to draw simple LINES:. •In GLSL for WebGL we must specify desired (gl. Place a call to glEnable (GL_DEPTH_TEST) in your program's initialization routine, after a context is created and made current. For example, the textures usually only have to be copied once at initialization, and modern OpenGL is designed to minimize the number of commands that have to be sent to the GPU. uniform____ calls. The WebGL extension WEBGL_color_buffer_float has been moved to community approved November 2014 and may be implemented. A frame buffer that contains a color buffer and a depth buffer is automatically created by WebGL when its context is created. The order of vertices affects the drawing of the shape. August 9, 2013 by admin. There are different types of buffers. resize(width, height) Resizes the drawing buffer of a WebGL rendering context. I just ran in a small issue with WebGL today, while doing a project on point set visualisation. Your code would only work reliably if the canvas webgl context was created with preserveDrawingBuffer flag. This means that if your shader uses 16 matrices, you will call WebGL API 16 times to update all matrices before using your shader. Like the depth buffer, a value is stored for every pixel, but this time you get to control when and how this value changes and when a fragment should be drawn depending on this value. The bindBuffer() call tells the WebGL state machine to use this specific memory as the current VBO (ARRAY_BUFFER) for all future operations, until told otherwise. Buffer Object Binding. Each frame buffer includes the frame's size, a crop rectangle, a display aspect ratio, and chroma subsampling format as well as the raw bytes. Each chapter starts with a summary of the learning goals for the chapter, followed by a detailed description of each topic. MeshLine library. I've tried it using it without glLineWidth and just use wireframe mode. The constructor for a GL buffer works as follows: var buffer = createBuffer(gl[, data, type, usage]) gl is a WebGL context; data is either an integer, an array, a typed array, an array buffer or an ndarray representing the data of the buffer. As usual, X is right in the plane of the texture, Y is up (again in the plane of the texture), thus given the right hand rule Z point to the "outside" of the plane of the texture. COPY_READ_BUFFER, gl. WebGL Урок №5 (ELEMENT_ARRAY_BUFFER) Getting started with three. One way of avoiding this is to unbind the pixel unpack buffer at the end of the function that binds it. This means that it's much faster. fbo_new_blend_equation. A WebGLBuffer storing data such as vertices or colors. Examples Creating a buffer. This extension exposes the EXT_color_buffer_float functionality to WebGL. How can I instruct bridge to call a function periodically in a loop? (render loop) this seems to not be covered anywhere, its the last piece I need :) A very. ARRAY_BUFFER and gl. Your code would only work reliably if the canvas webgl context was created with preserveDrawingBuffer flag. 0 functionality, and WebGL 2. Here are some WebGL examples and demos you should look at. WebGL provides two methods namely, drawArrays() and drawElements() to draw models. ) glEnable(GL_DEPTH_TEST); // Enable depth testing for z-culling. Over the last 2 or 3 days Firefox is suddenly plagued by the "Performing TLS Handshake" delay which makes it near impossible to use. getExtension() method. -A very simple WebGL program that does nothing but opens a canvas and clear it in yellow [code00. WebGL Workshop 1 Intro to GPU Programming with WebGL WebGL commands set up state on the GPU Array buffer has to be bound to an attribute in the vertex shader;. Join mailing list to get new posts right to your inbox. That doesn't sound terrible but in the real world that would probably be quite a bit more, and the fact is that in Javascript every call into native code (Like the WebGL API) carries a certain expense. Finally, we call the WebGL drawArrays() method to draw the square. In this episode of ProgrammingTIL WebGL, we'll look at a few concepts: * canvas object, check if webgl present * API: getContext, clearColor, clear, COLOR_BUFFER_BIT. 0 API enforcing the restrictions of that API and working around incompatibilities in drivers and platforms. js shim file and a new webgl_water_tutorial_bg. I’m going to start from fresh with the code: aside from the borrowed createProgram function (which is going to be essentially the same in every WebGL program that I write), everything else has been hand-written from a blank text file. WebGL extensions are available using the WebGLRenderingContext. Buffer object is a mechanism also provided by the WebGL which indicates a memory area allocated within the system. "SystemImpl. HTML preprocessors can make writing HTML more powerful or convenient. Trying to get my head around canvas, camera views and tile maps. When compiling, emscripten will map our code to the WebGL API. These lines tell where in the vertex buffer the data is i. Simple Transform Feedback WebGL 2 demo Next Vertex shader below just changes aPos. Sign in to like videos, comment, and subscribe. The drawing buffer is internal to WebGL. I call this function about 10 times per frame at 60fps and it takes 90-120min for the leak to get to about 1gb. toml enables features necessary to obtain and use a WebGL rendering context. js webgl - buffergeometry constructed from geometry by Callum Prentice webgl - buffergeometry constructed from geometry by Callum Prentice. Here is a simple WebGL example that shows WebGL in its simplest form. I have implemented fallback to WebGL 1 for other platforms than Windows, because there were bugs that I don't have the platforms to test on (I tested on Linux in VMWare, but only WebGL 1 as WebGL2 is blocked on VM), and that path is not very optimized. WebGL is integrated completely into all the web standards of the browser allowing GPU accelerated. It's probably not something you should be using in an actual app/demo, so approach with caution. WebGL / sdk / tests / conformance2 / buffers / uniform-buffers. Solution(s) mozilla-thunderbird-upgrade-38_6. Step 1 − Prepare the Canvas and Get the WebGL Rendering Context. Learning Objectives • Learn about WebGL —what it is, how it works, and some of the history • Discover the powers and capabilities of what WebGL can do • Take a tour through some of the best state-of-the-art WebGL content today. Therefore, when you learn WebGL, you are learning OpenGL for an environment that basically will execute on all modern computing devices. Polyfills; WebGLRenderer. createBuffer() call and bound to the ARRAY_BUFFER target at the OpenGL level with the glCtx. to do depth testing with the depth buffer. WebGL is integrated completely into all the web standards of the browser allowing GPU accelerated. WebGL Up and Running May 23, 2012 Deconstructing WebGL WebGL is an API Create one or more buffers. After drawing or updating a buffer, you don't necessarily have to unbind it, though it might be a good idea to do so to avoid accidental writes to buffers that were left bound. Vertex format. •In GLSL for WebGL we must specify desired (gl. Hi, Since this morning I am not able to generate 3D charts with plotly package. ← WebGL - Mouse Events. js, and the push for browser performance improvements, canvas and WebGL technologies are opening a world of possibilities. For information about how to install the most recent cumulative security update for Internet Explorer, read the instructions on Microsoft Update. Moves the Producer buffer into the Staging buffer 2. A simple render It's time to finally start drawing something - and let's make it easy today. We do that as follows. WebGL Dev List. Examples Creating a buffer. OpenGL ES 2 maps to WebGL 1, whereas OpenGL ES 3 maps to WebGL 2. This is usually done at initialization time. The draw call does not change either, you just have to set the right number of vertices that must be drawn :. WebGL doesn't run well enough because Unity doesn't support S3TC and ETC2 compression in WebGL which leads to too much texture memory use for WebGL mobile, which isn't a problem since Unity WebGL isn't suppoted on mobiles, because it doesn't run well enough on mobiles. WEBGL draw buffers. You call drawXXX once for each thing you want to draw each time you want to draw it. I am quite new with OpenGL, but if I understand right, these extensions are quite old and even already included in the core functionality. LINES, 16, gl. The WebGLBuffer interface is part of the WebGL API and represents an opaque buffer object storing data such as vertices or colors. An object is only rendered if its depth at a position is closer to the camera than the depth that was written to the depth buffer before. As expressed before, buffers are the preferred way of communication with the program. My guess is that we're doing something with invalidation incorrectly. Click To Show Running WebGL. 6), and various previous posts on depth and stencil.