diff options
Diffstat (limited to 'src/amd/common')
| -rw-r--r-- | src/amd/common/ac_nir_to_llvm.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c index 4b5f043d3af..ad32e15ba12 100644 --- a/src/amd/common/ac_nir_to_llvm.c +++ b/src/amd/common/ac_nir_to_llvm.c @@ -3092,7 +3092,8 @@ static void tex_fetch_ptrs(struct nir_to_llvm_context *ctx, else *samp_ptr = get_sampler_desc(ctx, instr->texture, DESC_SAMPLER); } - if (fmask_ptr && !instr->sampler && instr->op == nir_texop_txf_ms) + if (fmask_ptr && !instr->sampler && (instr->op == nir_texop_txf_ms || + instr->op == nir_texop_samples_identical)) *fmask_ptr = get_sampler_desc(ctx, instr->texture, DESC_FMASK); } @@ -3405,14 +3406,27 @@ static void visit_tex(struct nir_to_llvm_context *ctx, nir_tex_instr *instr) txf_address[3] = ctx->i32zero; set_tex_fetch_args(ctx, &txf_info, instr, nir_texop_txf, - res_ptr, samp_ptr, + fmask_ptr, NULL, txf_address, txf_count, 0xf); result = build_tex_intrinsic(ctx, instr, &txf_info); goto write_result; } - /* TODO sample FMASK magic */ + /* Adjust the sample index according to FMASK. + * + * For uncompressed MSAA surfaces, FMASK should return 0x76543210, + * which is the identity mapping. Each nibble says which physical sample + * should be fetched to get that sample. + * + * For example, 0x11111100 means there are only 2 samples stored and + * the second sample covers 3/4 of the pixel. When reading samples 0 + * and 1, return physical sample 0 (determined by the first two 0s + * in FMASK), otherwise return physical sample 1. + * + * The sample index should be adjusted as follows: + * sample_index = (fmask >> (sample_index * 4)) & 0xF; + */ if (instr->sampler_dim == GLSL_SAMPLER_DIM_MS) { LLVMValueRef txf_address[4]; struct ac_tex_info txf_info = { 0 }; @@ -3424,7 +3438,7 @@ static void visit_tex(struct nir_to_llvm_context *ctx, nir_tex_instr *instr) txf_address[3] = ctx->i32zero; set_tex_fetch_args(ctx, &txf_info, instr, nir_texop_txf, - res_ptr, samp_ptr, + fmask_ptr, NULL, txf_address, txf_count, 0xf); result = build_tex_intrinsic(ctx, instr, &txf_info); |