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82280a7e86
Since this is a downgrade path for drivers, it's useful to support both forms of these common sysvals. Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38562>
115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*
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* Copyright © 2021 Collabora Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/*
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* spirv_to_nir() creates system values for some builtin inputs, but
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* backends might want to have those inputs exposed as varyings. This
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* lowering pass allows backends to convert system values to input
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* varyings and should be called just after spirv_to_nir() when needed.
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*/
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static bool
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lower_sysvals_intrin(nir_builder *b, nir_intrinsic_instr *intrin, void * data)
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{
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const struct nir_lower_sysvals_to_varyings_options *options = data;
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gl_varying_slot slot;
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const struct glsl_type *type;
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switch (intrin->intrinsic) {
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#define SYSVAL_TO_VARYING(sysval, varying, typ) \
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case nir_intrinsic_load_##sysval: \
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if (!options->sysval) \
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return false; \
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slot = VARYING_SLOT_##varying; \
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type = glsl_##typ##_type(); \
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break;
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SYSVAL_TO_VARYING(frag_coord, POS, vec4);
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SYSVAL_TO_VARYING(point_coord, PNTC, vec2);
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SYSVAL_TO_VARYING(front_face, FACE, bool);
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SYSVAL_TO_VARYING(layer_id, LAYER, uint);
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SYSVAL_TO_VARYING(view_index, VIEW_INDEX, uint);
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#undef SYSVAL_TO_VARYING
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default:
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return false;
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}
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nir_variable *var =
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nir_get_variable_with_location(b->shader, nir_var_shader_in,
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slot, type);
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if (b->shader->info.stage == MESA_SHADER_FRAGMENT &&
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glsl_type_is_integer(type))
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var->data.interpolation = INTERP_MODE_FLAT;
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b->cursor = nir_before_instr(&intrin->instr);
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nir_def *val = nir_load_var(b, var);
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nir_def_replace(&intrin->def, val);
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return true;
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}
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bool
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nir_lower_sysvals_to_varyings(nir_shader *shader,
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const struct nir_lower_sysvals_to_varyings_options *options)
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{
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bool progress = false;
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nir_foreach_variable_with_modes(var, shader, nir_var_system_value) {
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switch (var->data.location) {
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#define SYSVAL_TO_VARYING(opt, sysval, varying) \
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case SYSTEM_VALUE_##sysval: \
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if (options->opt) { \
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var->data.mode = nir_var_shader_in; \
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var->data.location = VARYING_SLOT_##varying; \
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progress = true; \
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} \
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break
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SYSVAL_TO_VARYING(frag_coord, FRAG_COORD, POS);
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SYSVAL_TO_VARYING(point_coord, POINT_COORD, PNTC);
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SYSVAL_TO_VARYING(front_face, FRONT_FACE, FACE);
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SYSVAL_TO_VARYING(layer_id, LAYER_ID, LAYER);
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SYSVAL_TO_VARYING(view_index, VIEW_INDEX, VIEW_INDEX);
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#undef SYSVAL_TO_VARYING
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default:
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break;
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}
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}
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if (progress)
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nir_fixup_deref_modes(shader);
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progress |= nir_shader_intrinsics_pass(shader, lower_sysvals_intrin,
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nir_metadata_control_flow |
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nir_metadata_loop_analysis,
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(void *)options);
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return progress;
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}
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