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i965/fs: Support arbitrarily large sampler indices on Broadwell+. 

I added support for these on Haswell, but forgot to update the Broadwell
code before landing it.  Partially fixes Piglit's max-samplers test.

v2: Use get_element_ud() consistently, rather than using it for the
    source but using brw_vec1_grf for the destination..

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2014-01-23 10:58:25 -08:00
parent 0e21ba07f2
commit b371734331
1 changed files with 18 additions and 1 deletions
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19
src/mesa/drivers/dri/i965/gen8_fs_generator.cpp
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@ -252,6 +252,23 @@ gen8_fs_generator::generate_tex(fs_inst *ir,
brw_imm_ud(ir->texture_offset));
}
if (ir->sampler >= 16) {
/* The "Sampler Index" field can only store values between 0 and 15.
* However, we can add an offset to the "Sampler State Pointer"
* field, effectively selecting a different set of 16 samplers.
*
* The "Sampler State Pointer" needs to be aligned to a 32-byte
* offset, and each sampler state is only 16-bytes, so we can't
* exclusively use the offset - we have to use both.
*/
gen8_instruction *add =
ADD(get_element_ud(src, 3),
get_element_ud(brw_vec8_grf(0, 0), 3),
brw_imm_ud(16 * (ir->sampler / 16) *
sizeof(gen7_sampler_state)));
gen8_set_mask_control(add, BRW_MASK_DISABLE);
}
default_state.exec_size = save_exec_size;
}
@ -263,7 +280,7 @@ gen8_fs_generator::generate_tex(fs_inst *ir,
gen8_set_src0(brw, inst, src);
gen8_set_sampler_message(brw, inst,
surf_index,
ir->sampler,
ir->sampler % 16,
msg_type,
rlen,
ir->mlen,