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nir: fix lower_mediump_outputs to not require variables

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If IO is lowered, NIR doesn't have to contain any IO variables
(and in fact radeonsi removes them and other drivers should too).

This makes the pass work without variables.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6621>
This commit is contained in:
Marek Olšák 2020-09-06 00:25:05 -04:00 • committed by Marge Bot
parent c2ae39e0ce
commit 40f7afc1e9
1 changed files with 24 additions and 34 deletions
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58
src/compiler/nir/nir_lower_mediump_outputs.c
View file

@ -47,42 +47,32 @@ nir_lower_mediump_outputs(nir_shader *nir)
if (intr->intrinsic != nir_intrinsic_store_output)
continue;
nir_foreach_shader_out_variable(var, nir) {
if (var->data.driver_location != nir_intrinsic_base(intr))
continue; /* not found yet */
if (!nir_intrinsic_io_semantics(intr).medium_precision)
break; /* can't lower */
if (var->data.precision != GLSL_PRECISION_MEDIUM &&
var->data.precision != GLSL_PRECISION_LOW)
break; /* can't lower */
switch (glsl_get_base_type(var->type)) {
case GLSL_TYPE_FLOAT:
var->type = glsl_float16_type(var->type);
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_f2f16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_float16);
break;
case GLSL_TYPE_INT:
var->type = glsl_int16_type(var->type);
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_i2i16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_int16);
break;
case GLSL_TYPE_UINT:
var->type = glsl_uint16_type(var->type);
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_u2u16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_uint16);
break;
default:;
}
switch (nir_intrinsic_type(intr)) {
case nir_type_float32:
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_f2f16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_float16);
break;
case nir_type_int32:
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_i2i16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_int16);
break;
case nir_type_uint32:
b.cursor = nir_before_instr(&intr->instr);
nir_instr_rewrite_src(&intr->instr, &intr->src[0],
nir_src_for_ssa(nir_u2u16(&b, intr->src[0].ssa)));
nir_intrinsic_set_type(intr, nir_type_uint16);
break;
default:;
}
}
}