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/*
* Copyright © 2015 Red Hat
*
* 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.
*/
#include "nir.h"
#include "nir_builder.h"
static void
lower_impl(nir_function_impl *impl)
{
nir_shader *shader = impl->function->shader;
nir_builder b = nir_builder_at(nir_before_impl(impl));
/* The edge flag is the last input in st/mesa. This code is also called by
* i965 which calls it before any input locations are assigned.
*/
assert(shader->num_inputs == 0 ||
shader->num_inputs == util_bitcount64(shader->info.inputs_read));
assert(shader->num_outputs ==
util_bitcount64(shader->info.outputs_written));
/* Load an edge flag. */
nir_def *load = nir_load_input(&b, 1, 32, nir_imm_int(&b, 0),
.base = shader->num_inputs++,
.io_semantics.location = VERT_ATTRIB_EDGEFLAG);
/* Store an edge flag. */
nir_store_output(&b, load, nir_imm_int(&b, 0),
.base = shader->num_outputs++,
.io_semantics.location = VARYING_SLOT_EDGE);
nir_progress(true, impl, nir_metadata_control_flow);
}
bool
nir_lower_passthrough_edgeflags(nir_shader *shader)
{
assert(shader->info.stage == MESA_SHADER_VERTEX);
assert(shader->info.io_lowered);
shader->info.vs.needs_edge_flag = true;
lower_impl(nir_shader_get_entrypoint(shader));
return true;
}
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