Textures with dimensions non power of two get downscaled to power of two dimensions

Textures with dimensions non power of two get always downscaled to power of two dimensions. Previous algorithm was performing a “round” to aproximate power of two dimensions rather than floor.
Example :
r89: THREE.WebGLRenderer: image is not power of two (1638×2166). Resized to 1024×2048
r80: THREE.WebGLRenderer: image is not power of two (1638×2166). Resized to 2048×2048

Code in WebGLTextures.js r89:

function makePowerOfTwo( image ) {
...
canvas.width = _Math.floorPowerOfTwo( image.width );
canvas.height = _Math.floorPowerOfTwo( image.height ); 
...
}

Code in WebGLTextures.js r80:

function makePowerOfTwo( image ) {
...
canvas.width = _Math.nearestPowerOfTwo( image.width );
canvas.height = _Math.nearestPowerOfTwo( image.height ); 
...
}

Note: nearestPowerOfTwo is now deprecated and replaced with floorPowerOfTwo.

Three.js version

• [x ] Dev
• [x ] r89
• …

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