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ac/nir: Use vertex count minus 1 to determine max index in mesh shaders. 

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15199>
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Timur Kristóf 2022-02-27 17:58:46 +01:00 committed by Marge Bot
parent 16b417b8d6
commit 74f1e7965e
1 changed files with 2 additions and 1 deletions
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3
src/amd/common/ac_nir_lower_ngg.c
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@ -2451,10 +2451,11 @@ emit_ms_finale(nir_shader *shader, lower_ngg_ms_state *s)
nir_ssa_def *prim_idx_addr = nir_imul_imm(b, invocation_index, s->vertices_per_prim);
nir_ssa_def *indices_loaded = nir_load_shared(b, s->vertices_per_prim, 8, prim_idx_addr, .base = s->prim_vtx_indices_addr);
nir_ssa_def *indices[3];
nir_ssa_def *max_vtx_idx = nir_iadd_imm(b, num_vtx, -1u);
for (unsigned i = 0; i < s->vertices_per_prim; ++i) {
indices[i] = nir_u2u32(b, nir_channel(b, indices_loaded, i));
indices[i] = nir_umin(b, indices[i], nir_imm_int(b, shader->info.mesh.max_vertices_out - 1));
indices[i] = nir_umin(b, indices[i], max_vtx_idx);
}
nir_ssa_def *prim_exp_arg = emit_pack_ngg_prim_exp_arg(b, s->vertices_per_prim, indices, NULL, false);