Timur Kristóf
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/*
|
|
* Copyright © 2016 Red Hat.
|
|
* Copyright © 2016 Bas Nieuwenhuizen
|
|
* Copyright © 2023 Valve Corporation
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*/
|
|
|
|
#include "nir.h"
|
|
#include "nir_builder.h"
|
|
#include "radv_nir.h"
|
|
|
|
/**
|
|
* We use layered rendering to implement multiview, which means we need to map
|
|
* view_index to gl_Layer. The code generates a load from the layer_id sysval,
|
|
* but since we don't have a way to get at this information from the fragment
|
|
* shader, we also need to lower this to the gl_Layer varying. This pass
|
|
* lowers both to a varying load from the LAYER slot, before lowering io, so
|
|
* that nir_assign_var_locations() will give the LAYER varying the correct
|
|
* driver_location.
|
|
*/
|
|
bool
|
|
radv_nir_lower_view_index(nir_shader *nir)
|
|
{
|
|
bool progress = false;
|
|
nir_function_impl *entry = nir_shader_get_entrypoint(nir);
|
|
nir_builder b = nir_builder_create(entry);
|
|
|
|
nir_foreach_block (block, entry) {
|
|
nir_foreach_instr_safe (instr, block) {
|
|
if (instr->type != nir_instr_type_intrinsic)
|
|
continue;
|
|
|
|
nir_intrinsic_instr *load = nir_instr_as_intrinsic(instr);
|
|
if (load->intrinsic != nir_intrinsic_load_view_index)
|
|
continue;
|
|
|
|
b.cursor = nir_before_instr(instr);
|
|
nir_def *def = nir_load_layer_id(&b);
|
|
nir_def_rewrite_uses(&load->def, def);
|
|
|
|
nir_instr_remove(instr);
|
|
progress = true;
|
|
}
|
|
}
|
|
|
|
if (progress)
|
|
nir_metadata_preserve(entry, nir_metadata_control_flow);
|
|
else
|
|
nir_metadata_preserve(entry, nir_metadata_all);
|
|
|
|
return progress;
|
|
}
|