---
title: WebGLRenderingContext
slug: Web/API/WebGLRenderingContext
tags:
- WebGL
- WebGLRenderingContext
translation_of: Web/API/WebGLRenderingContext
---
{{APIRef("WebGL")}}
A interface de WebGLRenderingContext
fornece o contexto de renderização de OpenGL ES 2.0 para a superfície de desenho de um elemento {{HTMLElement("canvas")}} de HTML.
Para obter um objeto desta interface, call {{domxref("HTMLCanvasElement.getContext()", "getContext()")}} num elemento de <canvas>
, fornecendo "webgl" como um argumento:
var canvas = document.getElementById('myCanvas');
var gl = canvas.getContext('webgl');
Once you have the WebGL rendering context for a canvas, you can render within it.
The WebGL tutorial has more information, examples, and resources on how to get started with WebGL.
Constantes
See the WebGL constants page.
O contexto de WebGL
The following properties and methods provide general information and functionality to deal with the WebGL context:
{{domxref("WebGLRenderingContext.canvas")}}
A read-only back-reference to the {{domxref("HTMLCanvasElement")}}. Might be {{jsxref("null")}} if it is not associated with a {{HTMLElement("canvas")}} element.
{{domxref("WebGLRenderingContext.commit()")}} {{experimental_inline}}
Pushes frames back to the original {{domxref("HTMLCanvasElement")}}, if the context is not directly fixed to a specific canvas.
{{domxref("WebGLRenderingContext.drawingBufferWidth")}}
The read-only width of the current drawing buffer. Should match the width of the canvas element associated with this context.
{{domxref("WebGLRenderingContext.drawingBufferHeight")}}
The read-only height of the current drawing buffer. Should match the height of the canvas element associated with this context.
{{domxref("WebGLRenderingContext.getContextAttributes()")}}
Returns a WebGLContextAttributes
object that contains the actual context parameters. Might return {{jsxref("null")}}, if the context is lost.
{{domxref("WebGLRenderingContext.isContextLost()")}}
Returns true
if the context is lost, otherwise returns false
.
Visualização e recorte
{{domxref("WebGLRenderingContext.scissor()")}}
Defines the scissor box.
{{domxref("WebGLRenderingContext.viewport()")}}
Sets the viewport.
{{domxref("WebGLRenderingContext.activeTexture()")}}
Selects the active texture unit.
{{domxref("WebGLRenderingContext.blendColor()")}}
Sets the source and destination blending factors.
{{domxref("WebGLRenderingContext.blendEquation()")}}
Sets both the RGB blend equation and alpha blend equation to a single equation.
{{domxref("WebGLRenderingContext.blendEquationSeparate()")}}
Sets the RGB blend equation and alpha blend equation separately.
{{domxref("WebGLRenderingContext.blendFunc()")}}
Defines which function is used for blending pixel arithmetic.
{{domxref("WebGLRenderingContext.blendFuncSeparate()")}}
Defines which function is used for blending pixel arithmetic for RGB and alpha components separately.
{{domxref("WebGLRenderingContext.clearColor()")}}
Specifies the color values used when clearing color buffers.
{{domxref("WebGLRenderingContext.clearDepth()")}}
Specifies the depth value used when clearing the depth buffer.
{{domxref("WebGLRenderingContext.clearStencil()")}}
Specifies the stencil value used when clearing the stencil buffer.
{{domxref("WebGLRenderingContext.colorMask()")}}
Sets which color components to enable or to disable when drawing or rendering to a {{domxref("WebGLFramebuffer")}}.
{{domxref("WebGLRenderingContext.cullFace()")}}
Specifies whether or not front- and/or back-facing polygons can be culled.
{{domxref("WebGLRenderingContext.depthFunc()")}}
Specifies a function that compares incoming pixel depth to the current depth buffer value.
{{domxref("WebGLRenderingContext.depthMask()")}}
Sets whether writing into the depth buffer is enabled or disabled.
{{domxref("WebGLRenderingContext.depthRange()")}}
Specifies the depth range mapping from normalized device coordinates to window or viewport coordinates.
{{domxref("WebGLRenderingContext.disable()")}}
Disables specific WebGL capabilities for this context.
{{domxref("WebGLRenderingContext.enable()")}}
Enables specific WebGL capabilities for this context.
{{domxref("WebGLRenderingContext.frontFace()")}}
Specifies whether polygons are front- or back-facing by setting a winding orientation.
{{domxref("WebGLRenderingContext.getParameter()")}}
Returns a value for the passed parameter name.
{{domxref("WebGLRenderingContext.getError()")}}
Returns error information.
{{domxref("WebGLRenderingContext.hint()")}}
Specifies hints for certain behaviors. The interpretation of these hints depend on the implementation.
{{domxref("WebGLRenderingContext.isEnabled()")}}
Tests whether a specific WebGL capability is enabled or not for this context.
{{domxref("WebGLRenderingContext.lineWidth()")}}
Sets the line width of rasterized lines.
{{domxref("WebGLRenderingContext.pixelStorei()")}}
Specifies the pixel storage modes
{{domxref("WebGLRenderingContext.polygonOffset()")}}
Specifies the scale factors and units to calculate depth values.
{{domxref("WebGLRenderingContext.sampleCoverage()")}}
Specifies multi-sample coverage parameters for anti-aliasing effects.
{{domxref("WebGLRenderingContext.stencilFunc()")}}
Sets the both front and back function and reference value for stencil testing.
{{domxref("WebGLRenderingContext.stencilFuncSeparate()")}}
Sets the front and/or back function and reference value for stencil testing.
{{domxref("WebGLRenderingContext.stencilMask()")}}
Controls enabling and disabling of both the front and back writing of individual bits in the stencil planes.
{{domxref("WebGLRenderingContext.stencilMaskSeparate()")}}
Controls enabling and disabling of front and/or back writing of individual bits in the stencil planes.
{{domxref("WebGLRenderingContext.stencilOp()")}}
Sets both the front and back-facing stencil test actions.
{{domxref("WebGLRenderingContext.stencilOpSeparate()")}}
Sets the front and/or back-facing stencil test actions.
Buffers
{{domxref("WebGLRenderingContext.bindBuffer()")}}
Binds a WebGLBuffer
object to a given target.
{{domxref("WebGLRenderingContext.bufferData()")}}
Updates buffer data.
{{domxref("WebGLRenderingContext.bufferSubData()")}}
Updates buffer data starting at a passed offset.
{{domxref("WebGLRenderingContext.createBuffer()")}}
Creates a WebGLBuffer
object.
{{domxref("WebGLRenderingContext.deleteBuffer()")}}
Deletes a WebGLBuffer
object.
{{domxref("WebGLRenderingContext.getBufferParameter()")}}
Returns information about the buffer.
{{domxref("WebGLRenderingContext.isBuffer()")}}
Returns a Boolean indicating if the passed buffer is valid.
Framebuffers
{{domxref("WebGLRenderingContext.bindFramebuffer()")}}
Binds a WebGLFrameBuffer
object to a given target.
{{domxref("WebGLRenderingContext.checkFramebufferStatus()")}}
Returns the status of the framebuffer.
{{domxref("WebGLRenderingContext.createFramebuffer()")}}
Creates a WebGLFrameBuffer
object.
{{domxref("WebGLRenderingContext.deleteFramebuffer()")}}
Deletes a WebGLFrameBuffer
object.
{{domxref("WebGLRenderingContext.framebufferRenderbuffer()")}}
Attaches a WebGLRenderingBuffer
object to a WebGLFrameBuffer
object.
{{domxref("WebGLRenderingContext.framebufferTexture2D()")}}
Attaches a textures image to a WebGLFrameBuffer
object.
{{domxref("WebGLRenderingContext.getFramebufferAttachmentParameter()")}}
Returns information about the framebuffer.
{{domxref("WebGLRenderingContext.isFramebuffer()")}}
Returns a Boolean indicating if the passed WebGLFrameBuffer
object is valid.
{{domxref("WebGLRenderingContext.readPixels()")}}
Reads a block of pixels from the WebGLFrameBuffer
.
Renderbuffers
{{domxref("WebGLRenderingContext.bindRenderbuffer()")}}
Binds a WebGLRenderBuffer
object to a given target.
{{domxref("WebGLRenderingContext.createRenderbuffer()")}}
Creates a WebGLRenderBuffer
object.
{{domxref("WebGLRenderingContext.deleteRenderbuffer()")}}
Deletes a WebGLRenderBuffer
object.
{{domxref("WebGLRenderingContext.getRenderbufferParameter()")}}
Returns information about the renderbuffer.
{{domxref("WebGLRenderingContext.isRenderbuffer()")}}
Returns a Boolean indicating if the passed WebGLRenderingBuffer
is valid.
{{domxref("WebGLRenderingContext.renderbufferStorage()")}}
Creates a renderbuffer data store.
Texturas
{{domxref("WebGLRenderingContext.bindTexture()")}}
Binds a WebGLTexture
object to a given target.
{{domxref("WebGLRenderingContext.compressedTexImage2D()")}}
Specifies a 2D texture image in a compressed format.
{{domxref("WebGLRenderingContext.compressedTexSubImage2D()")}}
Specifies a 2D texture sub-image in a compressed format.
{{domxref("WebGLRenderingContext.copyTexImage2D()")}}
Copies a 2D texture image.
{{domxref("WebGLRenderingContext.copyTexSubImage2D()")}}
Copies a 2D texture sub-image.
{{domxref("WebGLRenderingContext.createTexture()")}}
Creates a WebGLTexture
object.
{{domxref("WebGLRenderingContext.deleteTexture()")}}
Deletes a WebGLTexture
object.
{{domxref("WebGLRenderingContext.generateMipmap()")}}
Generates a set of mipmaps for a WebGLTexture
object.
{{domxref("WebGLRenderingContext.getTexParameter()")}}
Returns information about the texture.
{{domxref("WebGLRenderingContext.isTexture()")}}
Returns a Boolean indicating if the passed WebGLTexture
is valid.
{{domxref("WebGLRenderingContext.texImage2D()")}}
Specifies a 2D texture image.
{{domxref("WebGLRenderingContext.texSubImage2D()")}}
Updates a sub-rectangle of the current WebGLTexture
.
{{domxref("WebGLRenderingContext.texParameter", "WebGLRenderingContext.texParameterf()")}}
Sets texture parameters.
{{domxref("WebGLRenderingContext.texParameter", "WebGLRenderingContext.texParameteri()")}}
Sets texture parameters.
Programas e shaders
{{domxref("WebGLRenderingContext.attachShader()")}}
Attaches a WebGLShader
to a WebGLProgram
.
{{domxref("WebGLRenderingContext.bindAttribLocation()")}}
Binds a generic vertex index to a named attribute variable.
{{domxref("WebGLRenderingContext.compileShader()")}}
Compiles a WebGLShader
.
{{domxref("WebGLRenderingContext.createProgram()")}}
Creates a WebGLProgram
.
{{domxref("WebGLRenderingContext.createShader()")}}
Creates a WebGLShader
.
{{domxref("WebGLRenderingContext.deleteProgram()")}}
Deletes a WebGLProgram
.
{{domxref("WebGLRenderingContext.deleteShader()")}}
Deletes a WebGLShader
.
{{domxref("WebGLRenderingContext.detachShader()")}}
Detaches a WebGLShader
.
{{domxref("WebGLRenderingContext.getAttachedShaders()")}}
Returns a list of WebGLShader
objects attached to a WebGLProgram
.
{{domxref("WebGLRenderingContext.getProgramParameter()")}}
Returns information about the program.
{{domxref("WebGLRenderingContext.getProgramInfoLog()")}}
Returns the information log for a WebGLProgram
object.
{{domxref("WebGLRenderingContext.getShaderParameter()")}}
Returns information about the shader.
{{domxref("WebGLRenderingContext.getShaderPrecisionFormat()")}}
Returns a WebGLShaderPrecisionFormat
object describing the precision for the numeric format of the shader.
{{domxref("WebGLRenderingContext.getShaderInfoLog()")}}
Returns the information log for a WebGLShader
object.
{{domxref("WebGLRenderingContext.getShaderSource()")}}
Returns the source code of a WebGLShader
as a string.
{{domxref("WebGLRenderingContext.isProgram()")}}
Returns a Boolean indicating if the passed WebGLProgram
is valid.
{{domxref("WebGLRenderingContext.isShader()")}}
Returns a Boolean indicating if the passed WebGLShader
is valid.
{{domxref("WebGLRenderingContext.linkProgram()")}}
Links the passed WebGLProgram
object.
{{domxref("WebGLRenderingContext.shaderSource()")}}
Sets the source code in a WebGLShader
.
{{domxref("WebGLRenderingContext.useProgram()")}}
Uses the specified WebGLProgram
as part the current rendering state.
{{domxref("WebGLRenderingContext.validateProgram()")}}
Validates a WebGLProgram
.
{{domxref("WebGLRenderingContext.disableVertexAttribArray()")}}
Disables a vertex attribute array at a given position.
{{domxref("WebGLRenderingContext.enableVertexAttribArray()")}}
Enables a vertex attribute array at a given position.
{{domxref("WebGLRenderingContext.getActiveAttrib()")}}
Returns information about an active attribute variable.
{{domxref("WebGLRenderingContext.getActiveUniform()")}}
Returns information about an active uniform variable.
{{domxref("WebGLRenderingContext.getAttribLocation()")}}
Returns the location of an attribute variable.
{{domxref("WebGLRenderingContext.getUniform()")}}
Returns the value of a uniform variable at a given location.
{{domxref("WebGLRenderingContext.getUniformLocation()")}}
Returns the location of a uniform variable.
{{domxref("WebGLRenderingContext.getVertexAttrib()")}}
Returns information about a vertex attribute at a given position.
{{domxref("WebGLRenderingContext.getVertexAttribOffset()")}}
Returns the address of a given vertex attribute.
{{domxref("WebGLRenderingContext.uniform()", "WebGLRenderingContext.uniform[1234][fi][v]()")}}
Specifies a value for a uniform variable.
{{domxref("WebGLRenderingContext.uniformMatrix()", "WebGLRenderingContext.uniformMatrix[234]fv()")}}
Specifies a matrix value for a uniform variable.
{{domxref("WebGLRenderingContext.vertexAttrib()", "WebGLRenderingContext.vertexAttrib[1234]f[v]()")}}
Specifies a value for a generic vertex attribute.
{{domxref("WebGLRenderingContext.vertexAttribPointer()")}}
Specifies the data formats and locations of vertex attributes in a vertex attributes array.
Drawing buffers
{{domxref("WebGLRenderingContext.clear()")}}
Clears specified buffers to preset values.
{{domxref("WebGLRenderingContext.drawArrays()")}}
Renders primitives from array data.
{{domxref("WebGLRenderingContext.drawElements()")}}
Renders primitives from element array data.
{{domxref("WebGLRenderingContext.finish()")}}
Blocks execution until all previously called commands are finished.
{{domxref("WebGLRenderingContext.flush()")}}
Empties different buffer commands, causing all commands to be executed as quickly as possible.
Trabalhar com extensões
These methods manage WebGL extensions:
{{domxref("WebGLRenderingContext.getSupportedExtensions()")}}
Returns an {{jsxref("Array")}} of {{domxref("DOMString")}} elements with all the supported WebGL extensions.
{{domxref("WebGLRenderingContext.getExtension()")}}
Returns an extension object.
Exemplos
WebGL context feature detection
{{page("/en-US/Learn/WebGL/By_example/Detect_WebGL", "summary")}}
{{page("/en-US/Learn/WebGL/By_example/Detect_WebGL", "detect-webgl-source")}}
{{EmbedLiveSample("detect-webgl-source", 660,150 ,"" , "Learn/WebGL/By_example/Detect_WebGL")}}
Effect of canvas size on rendering with WebGL
{{page("/en-US/Learn/WebGL/By_example/Canvas_size_and_WebGL", "canvas-size-and-webgl-intro")}}
{{page("/en-US/Learn/WebGL/By_example/Canvas_size_and_WebGL", "canvas-size-and-webgl-source")}}
{{EmbedLiveSample("canvas-size-and-webgl-source", 660,180 ,"" , "Learn/WebGL/By_example/Canvas_size_and_WebGL")}}
Especificações
Specification
Status
Comment
{{SpecName('WebGL', "#5.14", "WebGLRenderingContext")}}
{{Spec2('WebGL')}}
Initial definition
Compatibilidade de navegador
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
{{Compat("api.WebGLRenderingContext")}}
Consulte também
{{domxref("HTMLCanvasElement")}}
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