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ac/nir: clamp shadow texture comparison value on VI 

Needed for TC-compatible HTILE in radeonsi for test cases like
piglit spec/arb_texture_rg/execution/fs-shadow2d-red-01.shader_test

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Nicolai Hähnle 2017-06-25 15:45:09 +02:00
parent ac2ab5acad
commit 0f9e32519b
1 changed files with 13 additions and 1 deletions
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14
src/amd/common/ac_nir_to_llvm.c
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@ -4483,7 +4483,19 @@ static void visit_tex(struct ac_nir_context *ctx, nir_tex_instr *instr)
/* Pack depth comparison value */
if (instr->is_shadow && comparator) {
address[count++] = llvm_extract_elem(&ctx->ac, comparator, 0);
LLVMValueRef z = llvm_extract_elem(&ctx->ac, comparator, 0);
/* TC-compatible HTILE promotes Z16 and Z24 to Z32_FLOAT,
* so the depth comparison value isn't clamped for Z16 and
* Z24 anymore. Do it manually here.
*
* It's unnecessary if the original texture format was
* Z32_FLOAT, but we don't know that here.
*/
if (ctx->abi->chip_class == VI)
z = ac_build_clamp(&ctx->ac, z);
address[count++] = z;
}
/* pack derivatives */