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i965/fs: Fix handling of sampler messages with header but zero offset

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Gather unconditionally uses a header, but in some cases the
texture_offset value will be zero.

V2: Don't introduce a bogus conversion.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Forbes 2013-10-13 12:20:03 +13:00
parent f1e605f1ad
commit b38af01ccf
1 changed files with 11 additions and 3 deletions
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14
src/mesa/drivers/dri/i965/brw_fs_generator.cpp
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@ -539,9 +539,17 @@ fs_generator::generate_tex(fs_inst *inst, struct brw_reg dst, struct brw_reg src
brw_imm_ud(inst->texture_offset));
brw_pop_insn_state(p);
} else if (inst->header_present) {
assert(brw->gen < 7);
/* Set up an implied move from g0 to the MRF. */
src = retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW);
if (brw->gen >= 7) {
/* Explicitly set up the message header by copying g0 to the MRF. */
brw_push_insn_state(p);
brw_set_mask_control(p, BRW_MASK_DISABLE);
brw_set_compression_control(p, BRW_COMPRESSION_NONE);
brw_MOV(p, src, brw_vec8_grf(0, 0));
brw_pop_insn_state(p);
} else {
/* Set up an implied move from g0 to the MRF. */
src = retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UW);
}
}
uint32_t surface_index = (inst->opcode == SHADER_OPCODE_TG4