Transfers accumulation buffer values to the color buffer or buffers
currently selected for writing. Each
R,
G,
B, and
A component is multiplied by the value given to
accum,
then multiplied by 2^
n-1, clamped to the range [0,
2^
n-1], and stored in the corresponding display buffer cell.
The only fragment operations that are applied to this transfer are
pixel ownership, scissor, dithering, and color writemasks.