ref(gl1): don't clear the texture_write slot every time
ref(gl1): don't clear the texture_write slot every time

stardazed/stardazed,stardazed/stardazed-tx,zenmumbler/libzm,stardazed/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/libzm,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,zenmumbler/libzm,stardazed/stardazed,stardazed/stardazed-tx