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intel: Handle firstvertex in an identical way to BaseVertex

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Until we set gl_BaseVertex to zero for non-indexed draw calls
both have an identical value.

The Vertex Elements are kept like that:
* VE 1: <BaseVertex/firstvertex, BaseInstance, VertexID, InstanceID>
* VE 2: <Draw ID, 0, 0, 0>

v2 (idr): Mark nir_intrinsic_load_first_vertex as "unreachable" in
emit_system_values_block and fs_visitor::nir_emit_vs_intrinsic.
This commit is contained in:
Antia Puentes
2018-01-25 19:15:40 +01:00
committed by Ian Romanick
parent 0c8395e15d
commit c32e1035cb
7 changed files with 35 additions and 13 deletions
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3
src/intel/compiler/brw_nir.c
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@@ -239,6 +239,7 @@ brw_nir_lower_vs_inputs(nir_shader *nir,
const bool has_sgvs =
nir->info.system_values_read &
(BITFIELD64_BIT(SYSTEM_VALUE_BASE_VERTEX) |
BITFIELD64_BIT(SYSTEM_VALUE_FIRST_VERTEX) |
BITFIELD64_BIT(SYSTEM_VALUE_BASE_INSTANCE) |
BITFIELD64_BIT(SYSTEM_VALUE_VERTEX_ID_ZERO_BASE) |
BITFIELD64_BIT(SYSTEM_VALUE_INSTANCE_ID));
@@ -261,6 +262,7 @@ brw_nir_lower_vs_inputs(nir_shader *nir,
switch (intrin->intrinsic) {
case nir_intrinsic_load_base_vertex:
case nir_intrinsic_load_first_vertex:
case nir_intrinsic_load_base_instance:
case nir_intrinsic_load_vertex_id_zero_base:
case nir_intrinsic_load_instance_id:
@@ -278,6 +280,7 @@ brw_nir_lower_vs_inputs(nir_shader *nir,
nir_intrinsic_set_base(load, num_inputs);
switch (intrin->intrinsic) {
case nir_intrinsic_load_base_vertex:
case nir_intrinsic_load_first_vertex:
nir_intrinsic_set_component(load, 0);
break;
case nir_intrinsic_load_base_instance: