unsigned unknownA : 4;
- /* Each offset field is either an immediate (range 0-7) or, in the case of X, a
- * register full / select / upper triplet to select the offset vector
- * register in register mode. In register mode, Y=2 and Z=1 for some
- * reason. The range in register mode is [-8, 7].
+ /* In immediate mode, each offset field is an immediate range [0, 7].
*
- * In immediate mode, for texel fethces the range is the full [-8, 7],
+ * In register mode, offset_x becomes a register full / select / upper
+ * triplet and a vec3 swizzle is splattered across offset_y/offset_z in
+ * a genuinely bizarre way.
+ *
+ * For texel fetches in immediate mode, the range is the full [-8, 7],
* but for normal texturing the top bit must be zero and a register
- * used instead. It's not clear where this limitated is from. */
+ * used instead. It's not clear where this limitation is from. */
signed offset_x : 4;
signed offset_y : 4;