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  1. /*
  2.  * Copyright © 2014 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Connor Abbott (cwabbott0@gmail.com)
  25.  *
  26.  */
  27.  
  28. #include "nir.h"
  29. #include "main/mtypes.h"
  30.  
  31. static void
  32. convert_instr(nir_intrinsic_instr *instr)
  33. {
  34.    if (instr->intrinsic != nir_intrinsic_load_var)
  35.       return;
  36.  
  37.    nir_variable *var = instr->variables[0]->var;
  38.    if (var->data.mode != nir_var_system_value)
  39.       return;
  40.  
  41.    void *mem_ctx = ralloc_parent(instr);
  42.  
  43.    nir_intrinsic_op op;
  44.  
  45.    switch (var->data.location) {
  46.    case SYSTEM_VALUE_FRONT_FACE:
  47.       op = nir_intrinsic_load_front_face;
  48.       break;
  49.    case SYSTEM_VALUE_VERTEX_ID:
  50.       op = nir_intrinsic_load_vertex_id;
  51.       break;
  52.    case SYSTEM_VALUE_VERTEX_ID_ZERO_BASE:
  53.       op = nir_intrinsic_load_vertex_id_zero_base;
  54.       break;
  55.    case SYSTEM_VALUE_BASE_VERTEX:
  56.       op = nir_intrinsic_load_base_vertex;
  57.       break;
  58.    case SYSTEM_VALUE_INSTANCE_ID:
  59.       op = nir_intrinsic_load_instance_id;
  60.       break;
  61.    case SYSTEM_VALUE_SAMPLE_ID:
  62.       op = nir_intrinsic_load_sample_id;
  63.       break;
  64.    case SYSTEM_VALUE_SAMPLE_POS:
  65.       op = nir_intrinsic_load_sample_pos;
  66.       break;
  67.    case SYSTEM_VALUE_SAMPLE_MASK_IN:
  68.       op = nir_intrinsic_load_sample_mask_in;
  69.       break;
  70.    case SYSTEM_VALUE_INVOCATION_ID:
  71.       op = nir_intrinsic_load_invocation_id;
  72.       break;
  73.    default:
  74.       unreachable("not reached");
  75.    }
  76.  
  77.    nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op);
  78.  
  79.    if (instr->dest.is_ssa) {
  80.       nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,
  81.                         instr->dest.ssa.num_components, NULL);
  82.       nir_ssa_def_rewrite_uses(&instr->dest.ssa,
  83.                                nir_src_for_ssa(&new_instr->dest.ssa),
  84.                                mem_ctx);
  85.    } else {
  86.       nir_dest_copy(&new_instr->dest, &instr->dest, mem_ctx);
  87.    }
  88.  
  89.    nir_instr_insert_before(&instr->instr, &new_instr->instr);
  90.    nir_instr_remove(&instr->instr);
  91. }
  92.  
  93. static bool
  94. convert_block(nir_block *block, void *state)
  95. {
  96.    (void) state;
  97.  
  98.    nir_foreach_instr_safe(block, instr) {
  99.       if (instr->type == nir_instr_type_intrinsic)
  100.          convert_instr(nir_instr_as_intrinsic(instr));
  101.    }
  102.  
  103.    return true;
  104. }
  105.  
  106. static void
  107. convert_impl(nir_function_impl *impl)
  108. {
  109.    nir_foreach_block(impl, convert_block, NULL);
  110.    nir_metadata_preserve(impl, nir_metadata_block_index |
  111.                                nir_metadata_dominance);
  112. }
  113.  
  114. void
  115. nir_lower_system_values(nir_shader *shader)
  116. {
  117.    nir_foreach_overload(shader, overload) {
  118.       if (overload->impl)
  119.          convert_impl(overload->impl);
  120.    }
  121.  
  122.    exec_list_make_empty(&shader->system_values);
  123. }
  124.