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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Connor Abbott (cwabbott0@gmail.com)
*
*/
#include "nir.h"
#include "main/mtypes.h"
static void
convert_instr(nir_intrinsic_instr *instr)
{
if (instr->intrinsic != nir_intrinsic_load_var)
return;
nir_variable *var = instr->variables[0]->var;
if (var->data.mode != nir_var_system_value)
return;
void *mem_ctx = ralloc_parent(instr);
nir_intrinsic_op op;
switch (var->data.location) {
case SYSTEM_VALUE_FRONT_FACE:
op = nir_intrinsic_load_front_face;
break;
case SYSTEM_VALUE_VERTEX_ID:
op = nir_intrinsic_load_vertex_id;
break;
case SYSTEM_VALUE_VERTEX_ID_ZERO_BASE:
op = nir_intrinsic_load_vertex_id_zero_base;
break;
case SYSTEM_VALUE_BASE_VERTEX:
op = nir_intrinsic_load_base_vertex;
break;
case SYSTEM_VALUE_INSTANCE_ID:
op = nir_intrinsic_load_instance_id;
break;
case SYSTEM_VALUE_SAMPLE_ID:
op = nir_intrinsic_load_sample_id;
break;
case SYSTEM_VALUE_SAMPLE_POS:
op = nir_intrinsic_load_sample_pos;
break;
case SYSTEM_VALUE_SAMPLE_MASK_IN:
op = nir_intrinsic_load_sample_mask_in;
break;
case SYSTEM_VALUE_INVOCATION_ID:
op = nir_intrinsic_load_invocation_id;
break;
default:
unreachable("not reached");
}
nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op);
if (instr->dest.is_ssa) {
nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,
instr->dest.ssa.num_components, NULL);
nir_ssa_def_rewrite_uses(&instr->dest.ssa,
nir_src_for_ssa(&new_instr->dest.ssa),
mem_ctx);
} else {
nir_dest_copy(&new_instr->dest, &instr->dest, mem_ctx);
}
nir_instr_insert_before(&instr->instr, &new_instr->instr);
nir_instr_remove(&instr->instr);
}
static bool
convert_block(nir_block *block, void *state)
{
(void) state;
nir_foreach_instr_safe(block, instr) {
if (instr->type == nir_instr_type_intrinsic)
convert_instr(nir_instr_as_intrinsic(instr));
}
return true;
}
static void
convert_impl(nir_function_impl *impl)
{
nir_foreach_block(impl, convert_block, NULL);
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
}
void
nir_lower_system_values(nir_shader *shader)
{
nir_foreach_overload(shader, overload) {
if (overload->impl)
convert_impl(overload->impl);
}
exec_list_make_empty(&shader->system_values);
}
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