Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2012 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 |
| 21 | * DEALINGS IN THE SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * \file lower_ubo_reference.cpp |
| 26 | * |
| 27 | * IR lower pass to replace dereferences of variables in a uniform |
| 28 | * buffer object with usage of ir_binop_ubo_load expressions, each of |
| 29 | * which can read data up to the size of a vec4. |
| 30 | * |
| 31 | * This relieves drivers of the responsibility to deal with tricky UBO |
| 32 | * layout issues like std140 structures and row_major matrices on |
| 33 | * their own. |
| 34 | */ |
| 35 | |
| 36 | #include "ir.h" |
| 37 | #include "ir_builder.h" |
| 38 | #include "ir_rvalue_visitor.h" |
| 39 | #include "main/macros.h" |
| 40 | |
| 41 | using namespace ir_builder; |
| 42 | |
| 43 | namespace { |
| 44 | class lower_ubo_reference_visitor : public ir_rvalue_enter_visitor { |
| 45 | public: |
| 46 | lower_ubo_reference_visitor(struct gl_shader *shader) |
| 47 | : shader(shader) |
| 48 | { |
| 49 | } |
| 50 | |
| 51 | void handle_rvalue(ir_rvalue **rvalue); |
| 52 | void emit_ubo_loads(ir_dereference *deref, ir_variable *base_offset, |
| 53 | unsigned int deref_offset); |
| 54 | ir_expression *ubo_load(const struct glsl_type *type, |
| 55 | ir_rvalue *offset); |
| 56 | |
| 57 | void *mem_ctx; |
| 58 | struct gl_shader *shader; |
| 59 | struct gl_uniform_buffer_variable *ubo_var; |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 60 | ir_rvalue *uniform_block; |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 61 | bool progress; |
| 62 | }; |
| 63 | |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 64 | /** |
| 65 | * Determine the name of the interface block field |
| 66 | * |
| 67 | * This is the name of the specific member as it would appear in the |
| 68 | * \c gl_uniform_buffer_variable::Name field in the shader's |
| 69 | * \c UniformBlocks array. |
| 70 | */ |
| 71 | static const char * |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 72 | interface_field_name(void *mem_ctx, char *base_name, ir_dereference *d, |
| 73 | ir_rvalue **nonconst_block_index) |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 74 | { |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 75 | ir_rvalue *previous_index = NULL; |
| 76 | *nonconst_block_index = NULL; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 77 | |
| 78 | while (d != NULL) { |
| 79 | switch (d->ir_type) { |
| 80 | case ir_type_dereference_variable: { |
| 81 | ir_dereference_variable *v = (ir_dereference_variable *) d; |
| 82 | if (previous_index |
| 83 | && v->var->is_interface_instance() |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 84 | && v->var->type->is_array()) { |
| 85 | |
| 86 | ir_constant *const_index = previous_index->as_constant(); |
| 87 | if (!const_index) { |
| 88 | *nonconst_block_index = previous_index; |
| 89 | return ralloc_asprintf(mem_ctx, "%s[0]", base_name); |
| 90 | } else { |
| 91 | return ralloc_asprintf(mem_ctx, |
| 92 | "%s[%d]", |
| 93 | base_name, |
| 94 | const_index->get_uint_component(0)); |
| 95 | } |
| 96 | } else { |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 97 | return base_name; |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 98 | } |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 99 | |
| 100 | break; |
| 101 | } |
| 102 | |
| 103 | case ir_type_dereference_record: { |
| 104 | ir_dereference_record *r = (ir_dereference_record *) d; |
| 105 | |
| 106 | d = r->record->as_dereference(); |
| 107 | break; |
| 108 | } |
| 109 | |
| 110 | case ir_type_dereference_array: { |
| 111 | ir_dereference_array *a = (ir_dereference_array *) d; |
| 112 | |
| 113 | d = a->array->as_dereference(); |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 114 | previous_index = a->array_index; |
| 115 | |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 116 | break; |
| 117 | } |
| 118 | |
| 119 | default: |
| 120 | assert(!"Should not get here."); |
| 121 | break; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | assert(!"Should not get here."); |
| 126 | return NULL; |
| 127 | } |
| 128 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 129 | void |
| 130 | lower_ubo_reference_visitor::handle_rvalue(ir_rvalue **rvalue) |
| 131 | { |
| 132 | if (!*rvalue) |
| 133 | return; |
| 134 | |
| 135 | ir_dereference *deref = (*rvalue)->as_dereference(); |
| 136 | if (!deref) |
| 137 | return; |
| 138 | |
| 139 | ir_variable *var = deref->variable_referenced(); |
Ian Romanick | 13be1f4 | 2012-12-14 12:00:14 -0800 | [diff] [blame] | 140 | if (!var || !var->is_in_uniform_block()) |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 141 | return; |
| 142 | |
| 143 | mem_ctx = ralloc_parent(*rvalue); |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 144 | |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 145 | ir_rvalue *nonconst_block_index; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 146 | const char *const field_name = |
Paul Berry | 22d3ef2 | 2013-09-24 14:30:29 -0700 | [diff] [blame] | 147 | interface_field_name(mem_ctx, (char *) var->get_interface_type()->name, |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 148 | deref, &nonconst_block_index); |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 149 | |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 150 | this->uniform_block = NULL; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 151 | for (unsigned i = 0; i < shader->NumUniformBlocks; i++) { |
| 152 | if (strcmp(field_name, shader->UniformBlocks[i].Name) == 0) { |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 153 | |
| 154 | ir_constant *index = new(mem_ctx) ir_constant(i); |
| 155 | |
| 156 | if (nonconst_block_index) { |
| 157 | if (nonconst_block_index->type != glsl_type::uint_type) |
| 158 | nonconst_block_index = i2u(nonconst_block_index); |
| 159 | this->uniform_block = add(nonconst_block_index, index); |
| 160 | } else { |
| 161 | this->uniform_block = index; |
| 162 | } |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 163 | |
| 164 | struct gl_uniform_block *block = &shader->UniformBlocks[i]; |
| 165 | |
| 166 | this->ubo_var = var->is_interface_instance() |
Tapani Pälli | 447bb90 | 2013-12-12 15:08:59 +0200 | [diff] [blame] | 167 | ? &block->Uniforms[0] : &block->Uniforms[var->data.location]; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 168 | |
| 169 | break; |
| 170 | } |
| 171 | } |
| 172 | |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 173 | assert(this->uniform_block); |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 174 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 175 | ir_rvalue *offset = new(mem_ctx) ir_constant(0u); |
| 176 | unsigned const_offset = 0; |
| 177 | bool row_major = ubo_var->RowMajor; |
| 178 | |
| 179 | /* Calculate the offset to the start of the region of the UBO |
| 180 | * dereferenced by *rvalue. This may be a variable offset if an |
| 181 | * array dereference has a variable index. |
| 182 | */ |
| 183 | while (deref) { |
| 184 | switch (deref->ir_type) { |
| 185 | case ir_type_dereference_variable: { |
| 186 | const_offset += ubo_var->Offset; |
| 187 | deref = NULL; |
| 188 | break; |
| 189 | } |
| 190 | |
| 191 | case ir_type_dereference_array: { |
| 192 | ir_dereference_array *deref_array = (ir_dereference_array *)deref; |
| 193 | unsigned array_stride; |
| 194 | if (deref_array->array->type->is_matrix() && row_major) { |
| 195 | /* When loading a vector out of a row major matrix, the |
| 196 | * step between the columns (vectors) is the size of a |
| 197 | * float, while the step between the rows (elements of a |
| 198 | * vector) is handled below in emit_ubo_loads. |
| 199 | */ |
| 200 | array_stride = 4; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 201 | } else if (deref_array->type->is_interface()) { |
| 202 | /* We're processing an array dereference of an interface instance |
| 203 | * array. The thing being dereferenced *must* be a variable |
| 204 | * dereference because intefaces cannot be embedded an other |
| 205 | * types. In terms of calculating the offsets for the lowering |
| 206 | * pass, we don't care about the array index. All elements of an |
| 207 | * interface instance array will have the same offsets relative to |
| 208 | * the base of the block that backs them. |
| 209 | */ |
| 210 | assert(deref_array->array->as_dereference_variable()); |
| 211 | deref = deref_array->array->as_dereference(); |
| 212 | break; |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 213 | } else { |
| 214 | array_stride = deref_array->type->std140_size(row_major); |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 215 | array_stride = glsl_align(array_stride, 16); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Kenneth Graunke | e14b933 | 2014-04-06 22:41:34 -0700 | [diff] [blame] | 218 | ir_rvalue *array_index = deref_array->array_index; |
| 219 | if (array_index->type->base_type == GLSL_TYPE_INT) |
| 220 | array_index = i2u(array_index); |
| 221 | |
Ian Romanick | 146be3d | 2014-07-18 16:10:16 -0700 | [diff] [blame] | 222 | ir_constant *const_index = |
| 223 | array_index->constant_expression_value(NULL); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 224 | if (const_index) { |
Kenneth Graunke | e14b933 | 2014-04-06 22:41:34 -0700 | [diff] [blame] | 225 | const_offset += array_stride * const_index->value.u[0]; |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 226 | } else { |
| 227 | offset = add(offset, |
Kenneth Graunke | e14b933 | 2014-04-06 22:41:34 -0700 | [diff] [blame] | 228 | mul(array_index, |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 229 | new(mem_ctx) ir_constant(array_stride))); |
| 230 | } |
| 231 | deref = deref_array->array->as_dereference(); |
| 232 | break; |
| 233 | } |
| 234 | |
| 235 | case ir_type_dereference_record: { |
| 236 | ir_dereference_record *deref_record = (ir_dereference_record *)deref; |
| 237 | const glsl_type *struct_type = deref_record->record->type; |
| 238 | unsigned intra_struct_offset = 0; |
| 239 | |
| 240 | unsigned max_field_align = 16; |
| 241 | for (unsigned int i = 0; i < struct_type->length; i++) { |
| 242 | const glsl_type *type = struct_type->fields.structure[i].type; |
| 243 | unsigned field_align = type->std140_base_alignment(row_major); |
| 244 | max_field_align = MAX2(field_align, max_field_align); |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 245 | intra_struct_offset = glsl_align(intra_struct_offset, field_align); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 246 | |
| 247 | if (strcmp(struct_type->fields.structure[i].name, |
| 248 | deref_record->field) == 0) |
| 249 | break; |
| 250 | intra_struct_offset += type->std140_size(row_major); |
| 251 | } |
| 252 | |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 253 | const_offset = glsl_align(const_offset, max_field_align); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 254 | const_offset += intra_struct_offset; |
| 255 | |
| 256 | deref = deref_record->record->as_dereference(); |
| 257 | break; |
| 258 | } |
| 259 | default: |
| 260 | assert(!"not reached"); |
| 261 | deref = NULL; |
| 262 | break; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /* Now that we've calculated the offset to the start of the |
| 267 | * dereference, walk over the type and emit loads into a temporary. |
| 268 | */ |
| 269 | const glsl_type *type = (*rvalue)->type; |
| 270 | ir_variable *load_var = new(mem_ctx) ir_variable(type, |
| 271 | "ubo_load_temp", |
| 272 | ir_var_temporary); |
| 273 | base_ir->insert_before(load_var); |
| 274 | |
| 275 | ir_variable *load_offset = new(mem_ctx) ir_variable(glsl_type::uint_type, |
| 276 | "ubo_load_temp_offset", |
| 277 | ir_var_temporary); |
| 278 | base_ir->insert_before(load_offset); |
| 279 | base_ir->insert_before(assign(load_offset, offset)); |
| 280 | |
| 281 | deref = new(mem_ctx) ir_dereference_variable(load_var); |
| 282 | emit_ubo_loads(deref, load_offset, const_offset); |
| 283 | *rvalue = deref; |
| 284 | |
| 285 | progress = true; |
| 286 | } |
| 287 | |
| 288 | ir_expression * |
| 289 | lower_ubo_reference_visitor::ubo_load(const glsl_type *type, |
| 290 | ir_rvalue *offset) |
| 291 | { |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 292 | ir_rvalue *block_ref = this->uniform_block->clone(mem_ctx, NULL); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 293 | return new(mem_ctx) |
| 294 | ir_expression(ir_binop_ubo_load, |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 295 | type, |
| 296 | block_ref, |
| 297 | offset); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 298 | |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * Takes LHS and emits a series of assignments into its components |
| 303 | * from the UBO variable at variable_offset + deref_offset. |
| 304 | * |
| 305 | * Recursively calls itself to break the deref down to the point that |
| 306 | * the ir_binop_ubo_load expressions generated are contiguous scalars |
| 307 | * or vectors. |
| 308 | */ |
| 309 | void |
| 310 | lower_ubo_reference_visitor::emit_ubo_loads(ir_dereference *deref, |
| 311 | ir_variable *base_offset, |
| 312 | unsigned int deref_offset) |
| 313 | { |
| 314 | if (deref->type->is_record()) { |
| 315 | unsigned int field_offset = 0; |
| 316 | |
| 317 | for (unsigned i = 0; i < deref->type->length; i++) { |
| 318 | const struct glsl_struct_field *field = |
| 319 | &deref->type->fields.structure[i]; |
| 320 | ir_dereference *field_deref = |
| 321 | new(mem_ctx) ir_dereference_record(deref->clone(mem_ctx, NULL), |
| 322 | field->name); |
| 323 | |
| 324 | field_offset = |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 325 | glsl_align(field_offset, |
| 326 | field->type->std140_base_alignment(ubo_var->RowMajor)); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 327 | |
| 328 | emit_ubo_loads(field_deref, base_offset, deref_offset + field_offset); |
| 329 | |
| 330 | field_offset += field->type->std140_size(ubo_var->RowMajor); |
| 331 | } |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | if (deref->type->is_array()) { |
| 336 | unsigned array_stride = |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 337 | glsl_align(deref->type->fields.array->std140_size(ubo_var->RowMajor), |
| 338 | 16); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 339 | |
| 340 | for (unsigned i = 0; i < deref->type->length; i++) { |
| 341 | ir_constant *element = new(mem_ctx) ir_constant(i); |
| 342 | ir_dereference *element_deref = |
| 343 | new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL), |
| 344 | element); |
| 345 | emit_ubo_loads(element_deref, base_offset, |
| 346 | deref_offset + i * array_stride); |
| 347 | } |
| 348 | return; |
| 349 | } |
| 350 | |
| 351 | if (deref->type->is_matrix()) { |
| 352 | for (unsigned i = 0; i < deref->type->matrix_columns; i++) { |
| 353 | ir_constant *col = new(mem_ctx) ir_constant(i); |
| 354 | ir_dereference *col_deref = |
| 355 | new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL), |
| 356 | col); |
| 357 | |
Ian Romanick | ab7098c | 2014-07-15 19:59:18 -0700 | [diff] [blame^] | 358 | if (ubo_var->RowMajor) { |
| 359 | /* For a row-major matrix, the next column starts at the next |
| 360 | * element. |
| 361 | */ |
| 362 | emit_ubo_loads(col_deref, base_offset, deref_offset + i * 4); |
| 363 | } else { |
| 364 | /* std140 always rounds the stride of arrays (and matrices) to a |
| 365 | * vec4, so matrices are always 16 between columns/rows. |
| 366 | */ |
| 367 | emit_ubo_loads(col_deref, base_offset, deref_offset + i * 16); |
| 368 | } |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 369 | } |
| 370 | return; |
| 371 | } |
| 372 | |
| 373 | assert(deref->type->is_scalar() || |
| 374 | deref->type->is_vector()); |
| 375 | |
| 376 | if (!ubo_var->RowMajor) { |
| 377 | ir_rvalue *offset = add(base_offset, |
| 378 | new(mem_ctx) ir_constant(deref_offset)); |
| 379 | base_ir->insert_before(assign(deref->clone(mem_ctx, NULL), |
| 380 | ubo_load(deref->type, offset))); |
| 381 | } else { |
| 382 | /* We're dereffing a column out of a row-major matrix, so we |
| 383 | * gather the vector from each stored row. |
| 384 | */ |
| 385 | assert(deref->type->base_type == GLSL_TYPE_FLOAT); |
| 386 | /* Matrices, row_major or not, are stored as if they were |
| 387 | * arrays of vectors of the appropriate size in std140. |
| 388 | * Arrays have their strides rounded up to a vec4, so the |
| 389 | * matrix stride is always 16. |
| 390 | */ |
| 391 | unsigned matrix_stride = 16; |
| 392 | |
| 393 | for (unsigned i = 0; i < deref->type->vector_elements; i++) { |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 394 | ir_rvalue *chan_offset = |
| 395 | add(base_offset, |
| 396 | new(mem_ctx) ir_constant(deref_offset + i * matrix_stride)); |
| 397 | |
Ian Romanick | e013119 | 2013-03-22 18:55:49 -0700 | [diff] [blame] | 398 | base_ir->insert_before(assign(deref->clone(mem_ctx, NULL), |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 399 | ubo_load(glsl_type::float_type, |
Ian Romanick | e013119 | 2013-03-22 18:55:49 -0700 | [diff] [blame] | 400 | chan_offset), |
| 401 | (1U << i))); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 402 | } |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | } /* unnamed namespace */ |
| 407 | |
| 408 | void |
| 409 | lower_ubo_reference(struct gl_shader *shader, exec_list *instructions) |
| 410 | { |
| 411 | lower_ubo_reference_visitor v(shader); |
| 412 | |
| 413 | /* Loop over the instructions lowering references, because we take |
| 414 | * a deref of a UBO array using a UBO dereference as the index will |
| 415 | * produce a collection of instructions all of which have cloned |
| 416 | * UBO dereferences for that array index. |
| 417 | */ |
| 418 | do { |
| 419 | v.progress = false; |
| 420 | visit_list_elements(&v, instructions); |
| 421 | } while (v.progress); |
| 422 | } |