I just botched this when writing the original code. From the ARB_vertex_program specification: "The RSQ instruction approximates the reciprocal of the square root of the absolute value of the scalar operand and replicates it to all four components of the result vector."
Fixes a Glean vertProg1 subtest: RSQ test 2 (reciprocal square root of negative value) Cc: [email protected] Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90547 Signed-off-by: Kenneth Graunke <[email protected]> --- src/mesa/program/prog_to_nir.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/mesa/program/prog_to_nir.c b/src/mesa/program/prog_to_nir.c index e986e51..d3e3f15 100644 --- a/src/mesa/program/prog_to_nir.c +++ b/src/mesa/program/prog_to_nir.c @@ -764,7 +764,8 @@ ptn_emit_instruction(struct ptn_compile *c, struct prog_instruction *prog_inst) switch (op) { case OPCODE_RSQ: - ptn_move_dest(b, dest, nir_frsq(b, ptn_channel(b, src[0], X))); + ptn_move_dest(b, dest, + nir_frsq(b, nir_fabs(b, ptn_channel(b, src[0], X)))); break; case OPCODE_RCP: -- 2.4.2 _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
