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Technically this change shouldn't make a difference since we are calling glReadPixels with GL_RGBA GL_UNSIGNED_BYTE which is a 4 byte format and it should always result in the same value according to how OpenGL calculates the location of sequential rows. i.e. k = a/s * ceil(snl/a) where: a = alignment s = component size (1) n = number of components per pixel (4) l = number of pixels in a row gives: k = 4/1 * ceil(4l/4) and k = 1/1 * ceil(4l/1) which are equivalent I'm changing it because I've seen i915 driver code that bails out of hardware accelerated paths if the alignment isn't 1, and because conceptually we have no alignment constraints here so even if the current value has no effect, when we start reading back other formats it may upset things. |
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