src/intel/vulkan/anv_nir_lower_push_constants.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 "anv_nir.h"
  25
  26 struct lower_push_constants_state {
  27    nir_shader *shader;
  28    bool is_scalar;
  29 };
  30
  31 static bool
  32 lower_push_constants_block(nir_block *block, void *void_state)
  33 {
  34    struct lower_push_constants_state *state = void_state;
  35
  36    nir_foreach_instr(block, instr) {
  37       if (instr->type != nir_instr_type_intrinsic)
  38          continue;
  39
  40       nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
  41
  42       /* TODO: Handle indirect push constants */
  43       if (intrin->intrinsic != nir_intrinsic_load_push_constant)
  44          continue;
  45
  46       /* This wont work for vec4 stages. */
  47       assert(state->is_scalar);
  48
  49       assert(intrin->const_index[0] % 4 == 0);
  50       assert(intrin->const_index[1] == 128);
  51
  52       /* We just turn them into uniform loads with the appropreate offset */
  53       intrin->intrinsic = nir_intrinsic_load_uniform;
  54    }
  55
  56    return true;
  57 }
  58
  59 void
  60 anv_nir_lower_push_constants(nir_shader *shader, bool is_scalar)
  61 {
  62    struct lower_push_constants_state state = {
  63       .shader = shader,
  64       .is_scalar = is_scalar,
  65    };
  66
  67    nir_foreach_function(shader, function) {
  68       if (function->impl)
  69          nir_foreach_block(function->impl, lower_push_constants_block, &state);
  70    }
  71
  72    assert(shader->num_uniforms % 4 == 0);
  73    if (is_scalar)
  74       shader->num_uniforms /= 4;
  75    else
  76       shader->num_uniforms = DIV_ROUND_UP(shader->num_uniforms, 16);
  77 }