1 /* 2 * Copyright 2014 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 * Authors: 24 * Connor Abbott (cwabbott0 (at) gmail.com) 25 * 26 */ 27 28 #include "nir.h" 29 #include "nir_builder.h" 30 31 static bool 32 convert_block(nir_block *block, nir_builder *b) 33 { 34 bool progress = false; 35 36 nir_foreach_instr_safe(instr, block) { 37 if (instr->type != nir_instr_type_intrinsic) 38 continue; 39 40 nir_intrinsic_instr *load_var = nir_instr_as_intrinsic(instr); 41 42 if (load_var->intrinsic != nir_intrinsic_load_var) 43 continue; 44 45 nir_variable *var = load_var->variables[0]->var; 46 if (var->data.mode != nir_var_system_value) 47 continue; 48 49 b->cursor = nir_after_instr(&load_var->instr); 50 51 nir_ssa_def *sysval = NULL; 52 switch (var->data.location) { 53 case SYSTEM_VALUE_GLOBAL_INVOCATION_ID: { 54 /* From the GLSL man page for gl_GlobalInvocationID: 55 * 56 * "The value of gl_GlobalInvocationID is equal to 57 * gl_WorkGroupID * gl_WorkGroupSize + gl_LocalInvocationID" 58 */ 59 60 nir_const_value local_size; 61 local_size.u32[0] = b->shader->info->cs.local_size[0]; 62 local_size.u32[1] = b->shader->info->cs.local_size[1]; 63 local_size.u32[2] = b->shader->info->cs.local_size[2]; 64 65 nir_ssa_def *group_id = nir_load_work_group_id(b); 66 nir_ssa_def *local_id = nir_load_local_invocation_id(b); 67 68 sysval = nir_iadd(b, nir_imul(b, group_id, 69 nir_build_imm(b, 3, 32, local_size)), 70 local_id); 71 break; 72 } 73 74 case SYSTEM_VALUE_LOCAL_INVOCATION_INDEX: { 75 /* If lower_cs_local_index_from_id is true, then we derive the local 76 * index from the local id. 77 */ 78 if (!b->shader->options->lower_cs_local_index_from_id) 79 break; 80 81 /* From the GLSL man page for gl_LocalInvocationIndex: 82 * 83 * "The value of gl_LocalInvocationIndex is equal to 84 * gl_LocalInvocationID.z * gl_WorkGroupSize.x * 85 * gl_WorkGroupSize.y + gl_LocalInvocationID.y * 86 * gl_WorkGroupSize.x + gl_LocalInvocationID.x" 87 */ 88 nir_ssa_def *local_id = nir_load_local_invocation_id(b); 89 90 nir_ssa_def *size_x = 91 nir_imm_int(b, b->shader->info->cs.local_size[0]); 92 nir_ssa_def *size_y = 93 nir_imm_int(b, b->shader->info->cs.local_size[1]); 94 95 sysval = nir_imul(b, nir_channel(b, local_id, 2), 96 nir_imul(b, size_x, size_y)); 97 sysval = nir_iadd(b, sysval, 98 nir_imul(b, nir_channel(b, local_id, 1), size_x)); 99 sysval = nir_iadd(b, sysval, nir_channel(b, local_id, 0)); 100 break; 101 } 102 103 case SYSTEM_VALUE_VERTEX_ID: 104 if (b->shader->options->vertex_id_zero_based) { 105 sysval = nir_iadd(b, 106 nir_load_vertex_id_zero_base(b), 107 nir_load_base_vertex(b)); 108 } else { 109 sysval = nir_load_vertex_id(b); 110 } 111 break; 112 113 case SYSTEM_VALUE_INSTANCE_INDEX: 114 sysval = nir_iadd(b, 115 nir_load_instance_id(b), 116 nir_load_base_instance(b)); 117 break; 118 119 default: 120 break; 121 } 122 123 if (sysval == NULL) { 124 nir_intrinsic_op sysval_op = 125 nir_intrinsic_from_system_value(var->data.location); 126 sysval = nir_load_system_value(b, sysval_op, 0); 127 } 128 129 nir_ssa_def_rewrite_uses(&load_var->dest.ssa, nir_src_for_ssa(sysval)); 130 nir_instr_remove(&load_var->instr); 131 132 progress = true; 133 } 134 135 return progress; 136 } 137 138 static bool 139 convert_impl(nir_function_impl *impl) 140 { 141 bool progress = false; 142 nir_builder builder; 143 nir_builder_init(&builder, impl); 144 145 nir_foreach_block(block, impl) { 146 progress |= convert_block(block, &builder); 147 } 148 149 nir_metadata_preserve(impl, nir_metadata_block_index | 150 nir_metadata_dominance); 151 return progress; 152 } 153 154 bool 155 nir_lower_system_values(nir_shader *shader) 156 { 157 bool progress = false; 158 159 nir_foreach_function(function, shader) { 160 if (function->impl) 161 progress = convert_impl(function->impl) || progress; 162 } 163 164 exec_list_make_empty(&shader->system_values); 165 166 return progress; 167 } 168
