src/glsl/nir/nir_gather_info.c

   1 /*
   2  * Copyright © 2015 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
  24 #include "nir.h"
  25
  26 static void
  27 gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader)
  28 {
  29    switch (instr->intrinsic) {
  30    case nir_intrinsic_discard:
  31       assert(shader->stage == MESA_SHADER_FRAGMENT);
  32       shader->info.fs.uses_discard = true;
  33       break;
  34
  35    case nir_intrinsic_load_front_face:
  36    case nir_intrinsic_load_vertex_id:
  37    case nir_intrinsic_load_vertex_id_zero_base:
  38    case nir_intrinsic_load_base_vertex:
  39    case nir_intrinsic_load_instance_id:
  40    case nir_intrinsic_load_sample_id:
  41    case nir_intrinsic_load_sample_pos:
  42    case nir_intrinsic_load_sample_mask_in:
  43    case nir_intrinsic_load_primitive_id:
  44    case nir_intrinsic_load_invocation_id:
  45    case nir_intrinsic_load_local_invocation_id:
  46    case nir_intrinsic_load_work_group_id:
  47    case nir_intrinsic_load_num_work_groups:
  48       shader->info.system_values_read |=
  49          (1 << nir_system_value_from_intrinsic(instr->intrinsic));
  50       break;
  51
  52    case nir_intrinsic_end_primitive:
  53       assert(shader->stage == MESA_SHADER_GEOMETRY);
  54       shader->info.gs.uses_end_primitive = 1;
  55       break;
  56
  57    default:
  58       break;
  59    }
  60 }
  61
  62 static void
  63 gather_tex_info(nir_tex_instr *instr, nir_shader *shader)
  64 {
  65    if (instr->op == nir_texop_tg4)
  66       shader->info.uses_texture_gather = true;
  67 }
  68
  69 static bool
  70 gather_info_block(nir_block *block, void *shader)
  71 {
  72    nir_foreach_instr(block, instr) {
  73       switch (instr->type) {
  74       case nir_instr_type_intrinsic:
  75          gather_intrinsic_info(nir_instr_as_intrinsic(instr), shader);
  76          break;
  77       case nir_instr_type_tex:
  78          gather_tex_info(nir_instr_as_tex(instr), shader);
  79          break;
  80       case nir_instr_type_call:
  81          assert(!"nir_shader_gather_info only works if functions are inlined");
  82          break;
  83       default:
  84          break;
  85       }
  86    }
  87
  88    return true;
  89 }
  90
  91 void
  92 nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
  93 {
  94    shader->info.inputs_read = 0;
  95    foreach_list_typed(nir_variable, var, node, &shader->inputs)
  96       shader->info.inputs_read |= (1ull << var->data.location);
  97
  98    /* TODO: Some day we may need to add stream support to NIR */
  99    shader->info.outputs_written = 0;
 100    foreach_list_typed(nir_variable, var, node, &shader->outputs)
 101       shader->info.outputs_written |= (1ull << var->data.location);
 102
 103    shader->info.system_values_read = 0;
 104    foreach_list_typed(nir_variable, var, node, &shader->system_values)
 105       shader->info.system_values_read |= (1ull << var->data.location);
 106
 107    nir_foreach_block(entrypoint, gather_info_block, shader);
 108 }