src/compiler/glsl/gl_nir_lower_images.c

   1 /*
   2  * Copyright © 2019 Red Hat Inc.
   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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file
  26  *
  27  * Lower image operations by turning the image_deref_* into a image_* on an
  28  * index number or bindless_image_* intrinsic on a load_deref of the previous
  29  * deref source. All applicable indicies are also set so that fetching the
  30  * variable in the backend wouldn't be needed anymore.
  31  */
  32
  33 #include "compiler/nir/nir.h"
  34 #include "compiler/nir/nir_builder.h"
  35 #include "compiler/nir/nir_deref.h"
  36
  37 #include "compiler/glsl/gl_nir.h"
  38
  39 static void
  40 type_size_align_1(const struct glsl_type *type, unsigned *size, unsigned *align)
  41 {
  42    *size = 1;
  43    *align = 1;
  44 }
  45
  46 static bool
  47 lower_impl(nir_builder *b, nir_instr *instr, bool bindless_only)
  48 {
  49    if (instr->type != nir_instr_type_intrinsic)
  50       return false;
  51
  52    nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr);
  53
  54    nir_deref_instr *deref;
  55    nir_variable *var;
  56
  57    switch (intrinsic->intrinsic) {
  58    case nir_intrinsic_image_deref_atomic_add:
  59    case nir_intrinsic_image_deref_atomic_imin:
  60    case nir_intrinsic_image_deref_atomic_umin:
  61    case nir_intrinsic_image_deref_atomic_imax:
  62    case nir_intrinsic_image_deref_atomic_umax:
  63    case nir_intrinsic_image_deref_atomic_and:
  64    case nir_intrinsic_image_deref_atomic_or:
  65    case nir_intrinsic_image_deref_atomic_xor:
  66    case nir_intrinsic_image_deref_atomic_exchange:
  67    case nir_intrinsic_image_deref_atomic_comp_swap:
  68    case nir_intrinsic_image_deref_atomic_fadd:
  69    case nir_intrinsic_image_deref_load:
  70    case nir_intrinsic_image_deref_samples:
  71    case nir_intrinsic_image_deref_size:
  72    case nir_intrinsic_image_deref_store: {
  73       deref = nir_src_as_deref(intrinsic->src[0]);
  74       var = nir_deref_instr_get_variable(deref);
  75       break;
  76    }
  77    default:
  78       return false;
  79    }
  80
  81    bool bindless = deref->mode != nir_var_uniform || var->data.bindless;
  82    if (bindless_only && !bindless)
  83       return false;
  84
  85    b->cursor = nir_before_instr(instr);
  86
  87    nir_ssa_def *src;
  88    if (bindless) {
  89       src = nir_load_deref(b, deref);
  90    } else {
  91       src = nir_iadd_imm(b,
  92                          nir_build_deref_offset(b, deref, type_size_align_1),
  93                          var->data.driver_location);
  94    }
  95    nir_rewrite_image_intrinsic(intrinsic, src, bindless);
  96
  97    return true;
  98 }
  99
 100 bool
 101 gl_nir_lower_images(nir_shader *shader, bool bindless_only)
 102 {
 103    bool progress = false;
 104
 105    nir_foreach_function(function, shader) {
 106       if (function->impl) {
 107          nir_builder b;
 108          nir_builder_init(&b, function->impl);
 109
 110          bool impl_progress = false;
 111          nir_foreach_block(block, function->impl)
 112             nir_foreach_instr(instr, block)
 113                impl_progress |= lower_impl(&b, instr, bindless_only);
 114
 115          if (impl_progress) {
 116             nir_metadata_preserve(function->impl,
 117                                   nir_metadata_block_index |
 118                                   nir_metadata_dominance);
 119             progress = true;
 120          } else {
 121             nir_metadata_preserve(function->impl, nir_metadata_all);
 122          }
 123       }
 124    }
 125
 126    return progress;
 127 }