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nir: add nir_clear_mediump_io_flag

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Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35315>
This commit is contained in:
Marek Olšák 2025-06-01 17:54:12 -04:00 • committed by Marge Bot
parent 13005d5e4e
commit b636e5ca66
2 changed files with 31 additions and 0 deletions
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1
src/compiler/nir/nir.h
View file

@ -5844,6 +5844,7 @@ bool nir_recompute_io_bases(nir_shader *nir, nir_variable_mode modes);
bool nir_lower_mediump_vars(nir_shader *nir, nir_variable_mode modes);
bool nir_lower_mediump_io(nir_shader *nir, nir_variable_mode modes,
uint64_t varying_mask, bool use_16bit_slots);
bool nir_clear_mediump_io_flag(nir_shader *nir);
bool nir_force_mediump_io(nir_shader *nir, nir_variable_mode modes,
nir_alu_type types);
bool nir_unpack_16bit_varying_slots(nir_shader *nir, nir_variable_mode modes);

30
src/compiler/nir/nir_lower_mediump.c
View file

@ -284,6 +284,36 @@ nir_lower_mediump_io(nir_shader *nir, nir_variable_mode modes,
return nir_progress(changed, impl, nir_metadata_control_flow);
}
static bool
clear_mediump_io_flag(struct nir_builder *b, nir_intrinsic_instr *intr, void *data)
{
/* The mediump flag must be preserved for XFB, but other IO
* doesn't need it.
*/
if (nir_intrinsic_has_io_semantics(intr) &&
!nir_instr_xfb_write_mask(intr)) {
nir_io_semantics sem = nir_intrinsic_io_semantics(intr);
if (sem.medium_precision) {
sem.medium_precision = 0;
nir_intrinsic_set_io_semantics(intr, sem);
return true;
}
}
return false;
}
/* Set nir_io_semantics.medium_precision to 0 if it has no effect.
*
* This is recommended after nir_lower_mediump_io and before
* nir_opt_varyings / nir_opt_vectorize_io.
*/
bool
nir_clear_mediump_io_flag(nir_shader *nir)
{
return nir_shader_intrinsics_pass(nir, clear_mediump_io_flag, nir_metadata_all, NULL);
}
/**
* Set the mediump precision bit for those shader inputs and outputs that are
* set in the "modes" mask. Non-generic varyings (that GLES3 doesn't have)