Articles tagged #asm
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Next power of two
Feb 22, 2013
13 min
While looking to write a pure ooc version of ftgl, I was reading the source of ftgl-gl3 and I stumbled upon this piece of code:
static inline GLuint NextPowerOf2(GLuint in)
{
in -= 1;
in |= in >> 16;
in |= in >> 8;
in |= in >> 4;
in |= in >> 2;
in |= in >> 1;
return in + 1;
}
This is needed because dealing with power-of-two textures (32x32, 64x64, 128x128, etc.) is more efficient with OpenGL (some implementations don’t even support non-power-of-two textures!).
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