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Member "mesa-20.1.8/src/compiler/nir/nir_lower_uniforms_to_ubo.c" (16 Sep 2020, 4250 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:


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    1 /*
    2  * Copyright 2017 Advanced Micro Devices, 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  * on the rights to use, copy, modify, merge, publish, distribute, sub
    8  * license, and/or sell copies of the Software, and to permit persons to whom
    9  * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
   18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
   19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
   21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
   22  */
   23 
   24 /*
   25  * Remap load_uniform intrinsics to UBO accesses of UBO binding point 0.
   26  * Simultaneously, remap existing UBO accesses by increasing their binding
   27  * point by 1.
   28  *
   29  * Both the base and the offset are interpreted as 16-byte units.
   30  *
   31  * Note that locations can be set in different units, and the multiplier
   32  * argument caters to supporting these different units.
   33  * For example:
   34  * - st_glsl_to_nir uses dwords (4 bytes) so the multiplier should be 4
   35  * - tgsi_to_nir uses bytes, so the multiplier should be 16
   36  */
   37 
   38 #include "nir.h"
   39 #include "nir_builder.h"
   40 
   41 static bool
   42 lower_instr(nir_intrinsic_instr *instr, nir_builder *b, int multiplier)
   43 {
   44    b->cursor = nir_before_instr(&instr->instr);
   45 
   46    /* Increase all UBO binding points by 1. */
   47    if (instr->intrinsic == nir_intrinsic_load_ubo &&
   48        !b->shader->info.first_ubo_is_default_ubo) {
   49       nir_ssa_def *old_idx = nir_ssa_for_src(b, instr->src[0], 1);
   50       nir_ssa_def *new_idx = nir_iadd(b, old_idx, nir_imm_int(b, 1));
   51       nir_instr_rewrite_src(&instr->instr, &instr->src[0],
   52                             nir_src_for_ssa(new_idx));
   53       return true;
   54    }
   55 
   56    if (instr->intrinsic == nir_intrinsic_load_uniform) {
   57       nir_ssa_def *ubo_idx = nir_imm_int(b, 0);
   58       nir_ssa_def *ubo_offset =
   59          nir_iadd(b, nir_imm_int(b, multiplier * nir_intrinsic_base(instr)),
   60                   nir_imul(b, nir_imm_int(b, multiplier),
   61                            nir_ssa_for_src(b, instr->src[0], 1)));
   62 
   63       nir_intrinsic_instr *load =
   64          nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_ubo);
   65       load->num_components = instr->num_components;
   66       load->src[0] = nir_src_for_ssa(ubo_idx);
   67       load->src[1] = nir_src_for_ssa(ubo_offset);
   68       assert(instr->dest.ssa.bit_size >= 8);
   69       nir_intrinsic_set_align(load, instr->dest.ssa.bit_size / 8, 0);
   70       nir_ssa_dest_init(&load->instr, &load->dest,
   71                         load->num_components, instr->dest.ssa.bit_size,
   72                         instr->dest.ssa.name);
   73       nir_builder_instr_insert(b, &load->instr);
   74       nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(&load->dest.ssa));
   75 
   76       nir_instr_remove(&instr->instr);
   77       return true;
   78    }
   79 
   80    return false;
   81 }
   82 
   83 bool
   84 nir_lower_uniforms_to_ubo(nir_shader *shader, int multiplier)
   85 {
   86    bool progress = false;
   87 
   88    nir_foreach_function(function, shader) {
   89       if (function->impl) {
   90          nir_builder builder;
   91          nir_builder_init(&builder, function->impl);
   92          nir_foreach_block(block, function->impl) {
   93             nir_foreach_instr_safe(instr, block) {
   94                if (instr->type == nir_instr_type_intrinsic)
   95                   progress |= lower_instr(nir_instr_as_intrinsic(instr),
   96                                           &builder,
   97                                           multiplier);
   98             }
   99          }
  100 
  101          nir_metadata_preserve(function->impl, nir_metadata_block_index |
  102                                                nir_metadata_dominance);
  103       }
  104    }
  105 
  106    shader->info.first_ubo_is_default_ubo = true;
  107    return progress;
  108 }
  109 
  110