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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/pixelStorei below:

WebGLRenderingContext: pixelStorei() method - Web APIs

WebGLRenderingContext: pixelStorei() method

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The WebGLRenderingContext.pixelStorei() method of the WebGL API specifies the pixel storage modes.

Syntax 
pixelStorei(pname, param)
Parameters
pname

A GLenum specifying which parameter to set. See below for possible values.

param

A GLint specifying a value to set the pname parameter to. See below for possible values.

Return value

None (undefined).

Pixel storage parameters Parameter name (for pname) Description Type Default value Allowed values (for param) Specified in gl.PACK_ALIGNMENT Packing of pixel data into memory GLint 4 1, 2, 4, 8 OpenGL ES 2.0 gl.UNPACK_ALIGNMENT Unpacking of pixel data from memory. GLint 4 1, 2, 4, 8 OpenGL ES 2.0 gl.UNPACK_FLIP_Y_WEBGL Flips the source data along its vertical axis if true. GLboolean false true, false WebGL gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL Multiplies the alpha channel into the other color channels GLboolean false true, false WebGL gl.UNPACK_COLORSPACE_CONVERSION_WEBGL Default color space conversion or no color space conversion. GLenum gl.BROWSER_DEFAULT_WEBGL gl.BROWSER_DEFAULT_WEBGL, gl.NONE WebGL

When using a WebGL 2 context, the following values are available additionally:

Constant Description Type Default value Allowed values (for param) Specified in gl.PACK_ROW_LENGTH Number of pixels in a row. GLint 0 0 to Infinity OpenGL ES 3.0 gl.PACK_SKIP_PIXELS Number of pixel locations skipped before the first pixel is written into memory. GLint 0 0 to Infinity OpenGL ES 3.0 gl.PACK_SKIP_ROWS Number of rows of pixel locations skipped before the first pixel is written into memory GLint 0 0 to Infinity OpenGL ES 3.0 gl.UNPACK_ROW_LENGTH Number of pixels in a row. GLint 0 0 to Infinity OpenGL ES 3.0 gl.UNPACK_IMAGE_HEIGHT Image height used for reading pixel data from memory GLint 0 0 to Infinity OpenGL ES 3.0 gl.UNPACK_SKIP_PIXELS Number of pixel images skipped before the first pixel is read from memory GLint 0 0 to Infinity OpenGL ES 3.0 gl.UNPACK_SKIP_ROWS Number of rows of pixel locations skipped before the first pixel is read from memory GLint 0 0 to Infinity OpenGL ES 3.0 gl.UNPACK_SKIP_IMAGES Number of pixel images skipped before the first pixel is read from memory GLint 0 0 to Infinity OpenGL ES 3.0 Examples

Setting the pixel storage mode affects the WebGLRenderingContext.readPixels() operations, as well as unpacking of textures with the WebGLRenderingContext.texImage2D() and WebGLRenderingContext.texSubImage2D() methods.

const tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.pixelStorei(gl.PACK_ALIGNMENT, 4);

To check the values for packing and unpacking of pixel data, you can query the same pixel storage parameters with WebGLRenderingContext.getParameter().

gl.getParameter(gl.PACK_ALIGNMENT);
gl.getParameter(gl.UNPACK_ALIGNMENT);
Specifications Browser compatibility See also

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