src/intel/vulkan/anv_nir_apply_dynamic_offsets.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 #include "nir/nir_builder.h"
  26
  27 struct apply_dynamic_offsets_state {
  28    nir_shader *shader;
  29    nir_builder builder;
  30
  31    const struct anv_pipeline_layout *layout;
  32
  33    uint32_t indices_start;
  34 };
  35
  36 static bool
  37 apply_dynamic_offsets_block(nir_block *block, void *void_state)
  38 {
  39    struct apply_dynamic_offsets_state *state = void_state;
  40    struct anv_descriptor_set_layout *set_layout;
  41
  42    nir_builder *b = &state->builder;
  43
  44    nir_foreach_instr_safe(block, instr) {
  45       if (instr->type != nir_instr_type_intrinsic)
  46          continue;
  47
  48       nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
  49
  50       unsigned block_idx_src;
  51       switch (intrin->intrinsic) {
  52       case nir_intrinsic_load_ubo:
  53       case nir_intrinsic_load_ssbo:
  54          block_idx_src = 0;
  55          break;
  56       case nir_intrinsic_store_ssbo:
  57          block_idx_src = 1;
  58          break;
  59       default:
  60          continue; /* the loop */
  61       }
  62
  63       nir_instr *res_instr = intrin->src[block_idx_src].ssa->parent_instr;
  64       assert(res_instr->type == nir_instr_type_intrinsic);
  65       nir_intrinsic_instr *res_intrin = nir_instr_as_intrinsic(res_instr);
  66       assert(res_intrin->intrinsic == nir_intrinsic_vulkan_resource_index);
  67
  68       unsigned set = res_intrin->const_index[0];
  69       unsigned binding = res_intrin->const_index[1];
  70
  71       set_layout = state->layout->set[set].layout;
  72       if (set_layout->binding[binding].dynamic_offset_index < 0)
  73          continue;
  74
  75       b->cursor = nir_before_instr(&intrin->instr);
  76
  77       /* First, we need to generate the uniform load for the buffer offset */
  78       uint32_t index = state->layout->set[set].dynamic_offset_start +
  79                        set_layout->binding[binding].dynamic_offset_index;
  80
  81       nir_intrinsic_instr *offset_load =
  82          nir_intrinsic_instr_create(state->shader, nir_intrinsic_load_uniform);
  83       offset_load->num_components = 2;
  84       offset_load->const_index[0] = state->indices_start + index * 8;
  85       offset_load->src[0] = nir_src_for_ssa(nir_imul(b, res_intrin->src[0].ssa,
  86                                                      nir_imm_int(b, 8)));
  87
  88       nir_ssa_dest_init(&offset_load->instr, &offset_load->dest, 2, 32, NULL);
  89       nir_builder_instr_insert(b, &offset_load->instr);
  90
  91       nir_src *offset_src = nir_get_io_offset_src(intrin);
  92       nir_ssa_def *new_offset = nir_iadd(b, offset_src->ssa,
  93                                          &offset_load->dest.ssa);
  94
  95       /* In order to avoid out-of-bounds access, we predicate */
  96       nir_ssa_def *pred = nir_uge(b, nir_channel(b, &offset_load->dest.ssa, 1),
  97                                   offset_src->ssa);
  98       nir_if *if_stmt = nir_if_create(b->shader);
  99       if_stmt->condition = nir_src_for_ssa(pred);
 100       nir_cf_node_insert(b->cursor, &if_stmt->cf_node);
 101
 102       nir_instr_remove(&intrin->instr);
 103       *offset_src = nir_src_for_ssa(new_offset);
 104       nir_instr_insert_after_cf_list(&if_stmt->then_list, &intrin->instr);
 105
 106       if (intrin->intrinsic != nir_intrinsic_store_ssbo) {
 107          /* It's a load, we need a phi node */
 108          nir_phi_instr *phi = nir_phi_instr_create(b->shader);
 109          nir_ssa_dest_init(&phi->instr, &phi->dest,
 110                            intrin->num_components,
 111                            intrin->dest.ssa.bit_size, NULL);
 112
 113          nir_phi_src *src1 = ralloc(phi, nir_phi_src);
 114          struct exec_node *tnode = exec_list_get_tail(&if_stmt->then_list);
 115          src1->pred = exec_node_data(nir_block, tnode, cf_node.node);
 116          src1->src = nir_src_for_ssa(&intrin->dest.ssa);
 117          exec_list_push_tail(&phi->srcs, &src1->node);
 118
 119          b->cursor = nir_after_cf_list(&if_stmt->else_list);
 120          nir_ssa_def *zero = nir_build_imm(b, intrin->num_components,
 121             (nir_const_value) { .u32 = { 0, 0, 0, 0 } });
 122
 123          nir_phi_src *src2 = ralloc(phi, nir_phi_src);
 124          struct exec_node *enode = exec_list_get_tail(&if_stmt->else_list);
 125          src2->pred = exec_node_data(nir_block, enode, cf_node.node);
 126          src2->src = nir_src_for_ssa(zero);
 127          exec_list_push_tail(&phi->srcs, &src2->node);
 128
 129          assert(intrin->dest.is_ssa);
 130          nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
 131                                   nir_src_for_ssa(&phi->dest.ssa));
 132
 133          nir_instr_insert_after_cf(&if_stmt->cf_node, &phi->instr);
 134       }
 135    }
 136
 137    return true;
 138 }
 139
 140 void
 141 anv_nir_apply_dynamic_offsets(struct anv_pipeline *pipeline,
 142                               nir_shader *shader,
 143                               struct brw_stage_prog_data *prog_data)
 144 {
 145    struct apply_dynamic_offsets_state state = {
 146       .shader = shader,
 147       .layout = pipeline->layout,
 148       .indices_start = shader->num_uniforms,
 149    };
 150
 151    if (!state.layout || !state.layout->stage[shader->stage].has_dynamic_offsets)
 152       return;
 153
 154    nir_foreach_function(shader, function) {
 155       if (function->impl) {
 156          nir_builder_init(&state.builder, function->impl);
 157          nir_foreach_block(function->impl, apply_dynamic_offsets_block, &state);
 158          nir_metadata_preserve(function->impl, nir_metadata_block_index |
 159                                                nir_metadata_dominance);
 160       }
 161    }
 162
 163    struct anv_push_constants *null_data = NULL;
 164    for (unsigned i = 0; i < MAX_DYNAMIC_BUFFERS; i++) {
 165       prog_data->param[i * 2 + shader->num_uniforms / 4] =
 166          (const union gl_constant_value *)&null_data->dynamic[i].offset;
 167       prog_data->param[i * 2 + 1 + shader->num_uniforms / 4] =
 168          (const union gl_constant_value *)&null_data->dynamic[i].range;
 169    }
 170
 171    shader->num_uniforms += MAX_DYNAMIC_BUFFERS * 8;
 172 }