Changes

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Using previous source in the first TEV stage returns the primary color, while previous buffer returns zero.

Using Previous (15) as a source in the first TEV stage returns the value of source 3. If source 3 has Previous it returns zero. Previous buffer (13) always returns zero.

=== GPUREG_TEXENV''i''_OPERAND ===

=== GPUREG_TEXENV''i''_OPERAND ===