glGenerateMipmap - non-power-of-2

Question

Environment Ubuntu 17.04, Chrome 60.

Runs this example local without warnings/errors : https://github.com/mdn/webgl-examples/tree/gh-pages/tutorial/sample6

Then replace cubetexture.png with an non-power-of-2 image here : https://github.com/mdn/webgl-examples/blob/gh-pages/tutorial/sample6/webgl-demo.js#L220

Got as expected warnings/errors :

[.Offscreen-For-WebGL-0x13d050ba2c00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.

[.Offscreen-For-WebGL-0x13d050ba2c00]GL ERROR :GL_INVALID_OPERATION : glGenerateMipmap: Can not generate mips

Next add parameters :

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

Then runs ok without warnings, but still unexpected got the error :

[.Offscreen-For-WebGL-0x13d050fb4000]GL ERROR :GL_INVALID_OPERATION : glGenerateMipmap: Can not generate mips

Apart from the error message the non-power-of-2 image is render ok, at the cube. Same behavior in Firefox 54. Any tips of what is going on here?

glGenerateMipmap - non-power-of-2

2 Answers