73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
|
|
* Copyright © 2021 Collabora Ltd.
|
|
*
|
|
* 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"
|
|
|
|
/*
|
|
* spirv_to_nir() creates system values for some builtin inputs, but
|
|
* backends might want to have those inputs exposed as varyings. This
|
|
* lowering pass allows backends to convert system values to input
|
|
* varyings and should be called just after spirv_to_nir() when needed.
|
|
*/
|
|
|
|
bool
|
|
nir_lower_sysvals_to_varyings(nir_shader *shader,
|
|
const struct nir_lower_sysvals_to_varyings_options *options)
|
|
{
|
|
bool progress = false;
|
|
|
|
nir_foreach_variable_with_modes(var, shader, nir_var_system_value) {
|
|
switch (var->data.location) {
|
|
#define SYSVAL_TO_VARYING(opt, sysval, varying) \
|
|
case SYSTEM_VALUE_ ## sysval: \
|
|
if (options->opt) { \
|
|
var->data.mode = nir_var_shader_in; \
|
|
var->data.location = VARYING_SLOT_ ## varying; \
|
|
progress = true; \
|
|
} \
|
|
break
|
|
|
|
SYSVAL_TO_VARYING(frag_coord, FRAG_COORD, POS);
|
|
SYSVAL_TO_VARYING(point_coord, POINT_COORD, PNTC);
|
|
SYSVAL_TO_VARYING(front_face, FRONT_FACE, FACE);
|
|
|
|
#undef SYSVAL_TO_VARYING
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (progress)
|
|
nir_fixup_deref_modes(shader);
|
|
|
|
/* Nothing this does actually changes anything tracked by metadata.
|
|
* If we ever made this pass more complicated, we might need to care
|
|
* more about metadata.
|
|
*/
|
|
nir_shader_preserve_all_metadata(shader);
|
|
|
|
return progress;
|
|
}
|