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 | |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 43 | /** |
| 44 | * Determine if a thing being dereferenced is row-major |
| 45 | * |
| 46 | * There is some trickery here. |
| 47 | * |
| 48 | * If the thing being dereferenced is a member of uniform block \b without an |
| 49 | * instance name, then the name of the \c ir_variable is the field name of an |
| 50 | * interface type. If this field is row-major, then the thing referenced is |
| 51 | * row-major. |
| 52 | * |
| 53 | * If the thing being dereferenced is a member of uniform block \b with an |
| 54 | * instance name, then the last dereference in the tree will be an |
| 55 | * \c ir_dereference_record. If that record field is row-major, then the |
| 56 | * thing referenced is row-major. |
| 57 | */ |
| 58 | static bool |
| 59 | is_dereferenced_thing_row_major(const ir_dereference *deref) |
| 60 | { |
| 61 | bool matrix = false; |
| 62 | const ir_rvalue *ir = deref; |
| 63 | |
| 64 | while (true) { |
| 65 | matrix = matrix || ir->type->without_array()->is_matrix(); |
| 66 | |
| 67 | switch (ir->ir_type) { |
| 68 | case ir_type_dereference_array: { |
| 69 | const ir_dereference_array *const array_deref = |
| 70 | (const ir_dereference_array *) ir; |
| 71 | |
| 72 | ir = array_deref->array; |
| 73 | break; |
| 74 | } |
| 75 | |
| 76 | case ir_type_dereference_record: { |
| 77 | const ir_dereference_record *const record_deref = |
| 78 | (const ir_dereference_record *) ir; |
| 79 | |
| 80 | ir = record_deref->record; |
| 81 | |
| 82 | const int idx = ir->type->field_index(record_deref->field); |
| 83 | assert(idx >= 0); |
| 84 | |
| 85 | const enum glsl_matrix_layout matrix_layout = |
| 86 | glsl_matrix_layout(ir->type->fields.structure[idx].matrix_layout); |
| 87 | |
| 88 | switch (matrix_layout) { |
| 89 | case GLSL_MATRIX_LAYOUT_INHERITED: |
| 90 | break; |
| 91 | case GLSL_MATRIX_LAYOUT_COLUMN_MAJOR: |
| 92 | return false; |
| 93 | case GLSL_MATRIX_LAYOUT_ROW_MAJOR: |
| 94 | return matrix || deref->type->without_array()->is_record(); |
| 95 | } |
| 96 | |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | case ir_type_dereference_variable: { |
| 101 | const ir_dereference_variable *const var_deref = |
| 102 | (const ir_dereference_variable *) ir; |
| 103 | |
| 104 | const enum glsl_matrix_layout matrix_layout = |
| 105 | glsl_matrix_layout(var_deref->var->data.matrix_layout); |
| 106 | |
| 107 | switch (matrix_layout) { |
| 108 | case GLSL_MATRIX_LAYOUT_INHERITED: |
| 109 | assert(!matrix); |
| 110 | return false; |
| 111 | case GLSL_MATRIX_LAYOUT_COLUMN_MAJOR: |
| 112 | return false; |
| 113 | case GLSL_MATRIX_LAYOUT_ROW_MAJOR: |
Ian Romanick | c3f17bb | 2014-09-10 15:19:43 -0700 | [diff] [blame] | 114 | return matrix || deref->type->without_array()->is_record(); |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | unreachable("invalid matrix layout"); |
| 118 | break; |
| 119 | } |
| 120 | |
| 121 | default: |
| 122 | return false; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /* The tree must have ended with a dereference that wasn't an |
| 127 | * ir_dereference_variable. That is invalid, and it should be impossible. |
| 128 | */ |
| 129 | unreachable("invalid dereference tree"); |
| 130 | return false; |
| 131 | } |
| 132 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 133 | namespace { |
| 134 | class lower_ubo_reference_visitor : public ir_rvalue_enter_visitor { |
| 135 | public: |
| 136 | lower_ubo_reference_visitor(struct gl_shader *shader) |
| 137 | : shader(shader) |
| 138 | { |
| 139 | } |
| 140 | |
| 141 | void handle_rvalue(ir_rvalue **rvalue); |
| 142 | void emit_ubo_loads(ir_dereference *deref, ir_variable *base_offset, |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 143 | unsigned int deref_offset, bool row_major); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 144 | ir_expression *ubo_load(const struct glsl_type *type, |
| 145 | ir_rvalue *offset); |
| 146 | |
| 147 | void *mem_ctx; |
| 148 | struct gl_shader *shader; |
| 149 | struct gl_uniform_buffer_variable *ubo_var; |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 150 | ir_rvalue *uniform_block; |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 151 | bool progress; |
| 152 | }; |
| 153 | |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 154 | /** |
| 155 | * Determine the name of the interface block field |
| 156 | * |
| 157 | * This is the name of the specific member as it would appear in the |
| 158 | * \c gl_uniform_buffer_variable::Name field in the shader's |
| 159 | * \c UniformBlocks array. |
| 160 | */ |
| 161 | static const char * |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 162 | interface_field_name(void *mem_ctx, char *base_name, ir_dereference *d, |
| 163 | ir_rvalue **nonconst_block_index) |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 164 | { |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 165 | ir_rvalue *previous_index = NULL; |
| 166 | *nonconst_block_index = NULL; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 167 | |
| 168 | while (d != NULL) { |
| 169 | switch (d->ir_type) { |
| 170 | case ir_type_dereference_variable: { |
| 171 | ir_dereference_variable *v = (ir_dereference_variable *) d; |
| 172 | if (previous_index |
| 173 | && v->var->is_interface_instance() |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 174 | && v->var->type->is_array()) { |
| 175 | |
| 176 | ir_constant *const_index = previous_index->as_constant(); |
| 177 | if (!const_index) { |
| 178 | *nonconst_block_index = previous_index; |
| 179 | return ralloc_asprintf(mem_ctx, "%s[0]", base_name); |
| 180 | } else { |
| 181 | return ralloc_asprintf(mem_ctx, |
| 182 | "%s[%d]", |
| 183 | base_name, |
| 184 | const_index->get_uint_component(0)); |
| 185 | } |
| 186 | } else { |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 187 | return base_name; |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 188 | } |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 189 | |
| 190 | break; |
| 191 | } |
| 192 | |
| 193 | case ir_type_dereference_record: { |
| 194 | ir_dereference_record *r = (ir_dereference_record *) d; |
| 195 | |
| 196 | d = r->record->as_dereference(); |
| 197 | break; |
| 198 | } |
| 199 | |
| 200 | case ir_type_dereference_array: { |
| 201 | ir_dereference_array *a = (ir_dereference_array *) d; |
| 202 | |
| 203 | d = a->array->as_dereference(); |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 204 | previous_index = a->array_index; |
| 205 | |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 206 | break; |
| 207 | } |
| 208 | |
| 209 | default: |
| 210 | assert(!"Should not get here."); |
| 211 | break; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | assert(!"Should not get here."); |
| 216 | return NULL; |
| 217 | } |
| 218 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 219 | void |
| 220 | lower_ubo_reference_visitor::handle_rvalue(ir_rvalue **rvalue) |
| 221 | { |
| 222 | if (!*rvalue) |
| 223 | return; |
| 224 | |
| 225 | ir_dereference *deref = (*rvalue)->as_dereference(); |
| 226 | if (!deref) |
| 227 | return; |
| 228 | |
| 229 | ir_variable *var = deref->variable_referenced(); |
Ian Romanick | 13be1f4 | 2012-12-14 12:00:14 -0800 | [diff] [blame] | 230 | if (!var || !var->is_in_uniform_block()) |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 231 | return; |
| 232 | |
| 233 | mem_ctx = ralloc_parent(*rvalue); |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 234 | |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 235 | ir_rvalue *nonconst_block_index; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 236 | const char *const field_name = |
Paul Berry | 22d3ef2 | 2013-09-24 14:30:29 -0700 | [diff] [blame] | 237 | interface_field_name(mem_ctx, (char *) var->get_interface_type()->name, |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 238 | deref, &nonconst_block_index); |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 239 | |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 240 | this->uniform_block = NULL; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 241 | for (unsigned i = 0; i < shader->NumUniformBlocks; i++) { |
| 242 | if (strcmp(field_name, shader->UniformBlocks[i].Name) == 0) { |
Chris Forbes | be237a6 | 2014-05-16 22:07:24 +1200 | [diff] [blame] | 243 | |
| 244 | ir_constant *index = new(mem_ctx) ir_constant(i); |
| 245 | |
| 246 | if (nonconst_block_index) { |
| 247 | if (nonconst_block_index->type != glsl_type::uint_type) |
| 248 | nonconst_block_index = i2u(nonconst_block_index); |
| 249 | this->uniform_block = add(nonconst_block_index, index); |
| 250 | } else { |
| 251 | this->uniform_block = index; |
| 252 | } |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 253 | |
| 254 | struct gl_uniform_block *block = &shader->UniformBlocks[i]; |
| 255 | |
| 256 | this->ubo_var = var->is_interface_instance() |
Tapani Pälli | 447bb90 | 2013-12-12 15:08:59 +0200 | [diff] [blame] | 257 | ? &block->Uniforms[0] : &block->Uniforms[var->data.location]; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 258 | |
| 259 | break; |
| 260 | } |
| 261 | } |
| 262 | |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 263 | assert(this->uniform_block); |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 264 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 265 | ir_rvalue *offset = new(mem_ctx) ir_constant(0u); |
| 266 | unsigned const_offset = 0; |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 267 | bool row_major = is_dereferenced_thing_row_major(deref); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 268 | |
| 269 | /* Calculate the offset to the start of the region of the UBO |
| 270 | * dereferenced by *rvalue. This may be a variable offset if an |
| 271 | * array dereference has a variable index. |
| 272 | */ |
| 273 | while (deref) { |
| 274 | switch (deref->ir_type) { |
| 275 | case ir_type_dereference_variable: { |
| 276 | const_offset += ubo_var->Offset; |
| 277 | deref = NULL; |
| 278 | break; |
| 279 | } |
| 280 | |
| 281 | case ir_type_dereference_array: { |
| 282 | ir_dereference_array *deref_array = (ir_dereference_array *)deref; |
| 283 | unsigned array_stride; |
| 284 | if (deref_array->array->type->is_matrix() && row_major) { |
| 285 | /* When loading a vector out of a row major matrix, the |
| 286 | * step between the columns (vectors) is the size of a |
| 287 | * float, while the step between the rows (elements of a |
| 288 | * vector) is handled below in emit_ubo_loads. |
| 289 | */ |
| 290 | array_stride = 4; |
Ian Romanick | d1b4960 | 2013-01-22 00:44:58 -0500 | [diff] [blame] | 291 | } else if (deref_array->type->is_interface()) { |
| 292 | /* We're processing an array dereference of an interface instance |
| 293 | * array. The thing being dereferenced *must* be a variable |
| 294 | * dereference because intefaces cannot be embedded an other |
| 295 | * types. In terms of calculating the offsets for the lowering |
| 296 | * pass, we don't care about the array index. All elements of an |
| 297 | * interface instance array will have the same offsets relative to |
| 298 | * the base of the block that backs them. |
| 299 | */ |
| 300 | assert(deref_array->array->as_dereference_variable()); |
| 301 | deref = deref_array->array->as_dereference(); |
| 302 | break; |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 303 | } else { |
Ian Romanick | 5c75270 | 2014-09-08 18:25:15 -0700 | [diff] [blame] | 304 | /* Whether or not the field is row-major (because it might be a |
| 305 | * bvec2 or something) does not affect the array itself. We need |
| 306 | * to know whether an array element in its entirety is row-major. |
| 307 | */ |
| 308 | const bool array_row_major = |
| 309 | is_dereferenced_thing_row_major(deref_array); |
| 310 | |
| 311 | array_stride = deref_array->type->std140_size(array_row_major); |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 312 | array_stride = glsl_align(array_stride, 16); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 313 | } |
| 314 | |
Kenneth Graunke | e14b933 | 2014-04-06 22:41:34 -0700 | [diff] [blame] | 315 | ir_rvalue *array_index = deref_array->array_index; |
| 316 | if (array_index->type->base_type == GLSL_TYPE_INT) |
| 317 | array_index = i2u(array_index); |
| 318 | |
Ian Romanick | 146be3d | 2014-07-18 16:10:16 -0700 | [diff] [blame] | 319 | ir_constant *const_index = |
| 320 | array_index->constant_expression_value(NULL); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 321 | if (const_index) { |
Kenneth Graunke | e14b933 | 2014-04-06 22:41:34 -0700 | [diff] [blame] | 322 | const_offset += array_stride * const_index->value.u[0]; |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 323 | } else { |
| 324 | offset = add(offset, |
Kenneth Graunke | e14b933 | 2014-04-06 22:41:34 -0700 | [diff] [blame] | 325 | mul(array_index, |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 326 | new(mem_ctx) ir_constant(array_stride))); |
| 327 | } |
| 328 | deref = deref_array->array->as_dereference(); |
| 329 | break; |
| 330 | } |
| 331 | |
| 332 | case ir_type_dereference_record: { |
| 333 | ir_dereference_record *deref_record = (ir_dereference_record *)deref; |
| 334 | const glsl_type *struct_type = deref_record->record->type; |
| 335 | unsigned intra_struct_offset = 0; |
| 336 | |
Ian Romanick | 8e01c66 | 2014-09-08 12:23:39 -0700 | [diff] [blame] | 337 | /* glsl_type::std140_base_alignment doesn't grok interfaces. Use |
| 338 | * 16-bytes for the alignment because that is the general minimum of |
| 339 | * std140. |
| 340 | */ |
| 341 | const unsigned struct_alignment = struct_type->is_interface() |
| 342 | ? 16 |
| 343 | : struct_type->std140_base_alignment(row_major); |
| 344 | |
| 345 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 346 | for (unsigned int i = 0; i < struct_type->length; i++) { |
| 347 | const glsl_type *type = struct_type->fields.structure[i].type; |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 348 | |
| 349 | ir_dereference_record *field_deref = |
| 350 | new(mem_ctx) ir_dereference_record(deref_record->record, |
| 351 | struct_type->fields.structure[i].name); |
| 352 | const bool field_row_major = |
| 353 | is_dereferenced_thing_row_major(field_deref); |
| 354 | |
| 355 | ralloc_free(field_deref); |
| 356 | |
| 357 | unsigned field_align = type->std140_base_alignment(field_row_major); |
| 358 | |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 359 | intra_struct_offset = glsl_align(intra_struct_offset, field_align); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 360 | |
| 361 | if (strcmp(struct_type->fields.structure[i].name, |
| 362 | deref_record->field) == 0) |
| 363 | break; |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 364 | intra_struct_offset += type->std140_size(field_row_major); |
Ian Romanick | 8e01c66 | 2014-09-08 12:23:39 -0700 | [diff] [blame] | 365 | |
| 366 | /* If the field just examined was itself a structure, apply rule |
| 367 | * #9: |
| 368 | * |
| 369 | * "The structure may have padding at the end; the base offset |
| 370 | * of the member following the sub-structure is rounded up to |
| 371 | * the next multiple of the base alignment of the structure." |
| 372 | */ |
| 373 | if (type->without_array()->is_record()) { |
| 374 | intra_struct_offset = glsl_align(intra_struct_offset, |
| 375 | struct_alignment); |
| 376 | |
| 377 | } |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 380 | const_offset += intra_struct_offset; |
| 381 | |
| 382 | deref = deref_record->record->as_dereference(); |
| 383 | break; |
| 384 | } |
| 385 | default: |
| 386 | assert(!"not reached"); |
| 387 | deref = NULL; |
| 388 | break; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | /* Now that we've calculated the offset to the start of the |
| 393 | * dereference, walk over the type and emit loads into a temporary. |
| 394 | */ |
| 395 | const glsl_type *type = (*rvalue)->type; |
| 396 | ir_variable *load_var = new(mem_ctx) ir_variable(type, |
| 397 | "ubo_load_temp", |
| 398 | ir_var_temporary); |
| 399 | base_ir->insert_before(load_var); |
| 400 | |
| 401 | ir_variable *load_offset = new(mem_ctx) ir_variable(glsl_type::uint_type, |
| 402 | "ubo_load_temp_offset", |
| 403 | ir_var_temporary); |
| 404 | base_ir->insert_before(load_offset); |
| 405 | base_ir->insert_before(assign(load_offset, offset)); |
| 406 | |
| 407 | deref = new(mem_ctx) ir_dereference_variable(load_var); |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 408 | emit_ubo_loads(deref, load_offset, const_offset, row_major); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 409 | *rvalue = deref; |
| 410 | |
| 411 | progress = true; |
| 412 | } |
| 413 | |
| 414 | ir_expression * |
| 415 | lower_ubo_reference_visitor::ubo_load(const glsl_type *type, |
| 416 | ir_rvalue *offset) |
| 417 | { |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 418 | ir_rvalue *block_ref = this->uniform_block->clone(mem_ctx, NULL); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 419 | return new(mem_ctx) |
| 420 | ir_expression(ir_binop_ubo_load, |
Chris Forbes | c59802d | 2014-05-18 12:03:54 +1200 | [diff] [blame] | 421 | type, |
| 422 | block_ref, |
| 423 | offset); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 424 | |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Takes LHS and emits a series of assignments into its components |
| 429 | * from the UBO variable at variable_offset + deref_offset. |
| 430 | * |
| 431 | * Recursively calls itself to break the deref down to the point that |
| 432 | * the ir_binop_ubo_load expressions generated are contiguous scalars |
| 433 | * or vectors. |
| 434 | */ |
| 435 | void |
| 436 | lower_ubo_reference_visitor::emit_ubo_loads(ir_dereference *deref, |
| 437 | ir_variable *base_offset, |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 438 | unsigned int deref_offset, |
| 439 | bool row_major) |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 440 | { |
| 441 | if (deref->type->is_record()) { |
| 442 | unsigned int field_offset = 0; |
| 443 | |
| 444 | for (unsigned i = 0; i < deref->type->length; i++) { |
| 445 | const struct glsl_struct_field *field = |
| 446 | &deref->type->fields.structure[i]; |
| 447 | ir_dereference *field_deref = |
| 448 | new(mem_ctx) ir_dereference_record(deref->clone(mem_ctx, NULL), |
| 449 | field->name); |
| 450 | |
| 451 | field_offset = |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 452 | glsl_align(field_offset, |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 453 | field->type->std140_base_alignment(row_major)); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 454 | |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 455 | emit_ubo_loads(field_deref, base_offset, deref_offset + field_offset, |
| 456 | row_major); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 457 | |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 458 | field_offset += field->type->std140_size(row_major); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 459 | } |
| 460 | return; |
| 461 | } |
| 462 | |
| 463 | if (deref->type->is_array()) { |
| 464 | unsigned array_stride = |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 465 | glsl_align(deref->type->fields.array->std140_size(row_major), |
Ian Romanick | 11d42de | 2013-01-22 00:06:10 -0500 | [diff] [blame] | 466 | 16); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 467 | |
| 468 | for (unsigned i = 0; i < deref->type->length; i++) { |
| 469 | ir_constant *element = new(mem_ctx) ir_constant(i); |
| 470 | ir_dereference *element_deref = |
| 471 | new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL), |
| 472 | element); |
| 473 | emit_ubo_loads(element_deref, base_offset, |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 474 | deref_offset + i * array_stride, |
| 475 | row_major); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 476 | } |
| 477 | return; |
| 478 | } |
| 479 | |
| 480 | if (deref->type->is_matrix()) { |
| 481 | for (unsigned i = 0; i < deref->type->matrix_columns; i++) { |
| 482 | ir_constant *col = new(mem_ctx) ir_constant(i); |
| 483 | ir_dereference *col_deref = |
| 484 | new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL), |
| 485 | col); |
| 486 | |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 487 | if (row_major) { |
Ian Romanick | ab7098c | 2014-07-15 19:59:18 -0700 | [diff] [blame] | 488 | /* For a row-major matrix, the next column starts at the next |
| 489 | * element. |
| 490 | */ |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 491 | emit_ubo_loads(col_deref, base_offset, deref_offset + i * 4, |
| 492 | row_major); |
Ian Romanick | ab7098c | 2014-07-15 19:59:18 -0700 | [diff] [blame] | 493 | } else { |
| 494 | /* std140 always rounds the stride of arrays (and matrices) to a |
| 495 | * vec4, so matrices are always 16 between columns/rows. |
| 496 | */ |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 497 | emit_ubo_loads(col_deref, base_offset, deref_offset + i * 16, |
| 498 | row_major); |
Ian Romanick | ab7098c | 2014-07-15 19:59:18 -0700 | [diff] [blame] | 499 | } |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 500 | } |
| 501 | return; |
| 502 | } |
| 503 | |
| 504 | assert(deref->type->is_scalar() || |
| 505 | deref->type->is_vector()); |
| 506 | |
Ian Romanick | b17a4d5 | 2014-06-30 10:05:27 -0700 | [diff] [blame] | 507 | if (!row_major) { |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 508 | ir_rvalue *offset = add(base_offset, |
| 509 | new(mem_ctx) ir_constant(deref_offset)); |
| 510 | base_ir->insert_before(assign(deref->clone(mem_ctx, NULL), |
| 511 | ubo_load(deref->type, offset))); |
| 512 | } else { |
| 513 | /* We're dereffing a column out of a row-major matrix, so we |
| 514 | * gather the vector from each stored row. |
| 515 | */ |
| 516 | assert(deref->type->base_type == GLSL_TYPE_FLOAT); |
| 517 | /* Matrices, row_major or not, are stored as if they were |
| 518 | * arrays of vectors of the appropriate size in std140. |
| 519 | * Arrays have their strides rounded up to a vec4, so the |
| 520 | * matrix stride is always 16. |
| 521 | */ |
| 522 | unsigned matrix_stride = 16; |
| 523 | |
| 524 | for (unsigned i = 0; i < deref->type->vector_elements; i++) { |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 525 | ir_rvalue *chan_offset = |
| 526 | add(base_offset, |
| 527 | new(mem_ctx) ir_constant(deref_offset + i * matrix_stride)); |
| 528 | |
Ian Romanick | e013119 | 2013-03-22 18:55:49 -0700 | [diff] [blame] | 529 | base_ir->insert_before(assign(deref->clone(mem_ctx, NULL), |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 530 | ubo_load(glsl_type::float_type, |
Ian Romanick | e013119 | 2013-03-22 18:55:49 -0700 | [diff] [blame] | 531 | chan_offset), |
| 532 | (1U << i))); |
Eric Anholt | a75f268 | 2012-07-11 08:26:31 -0700 | [diff] [blame] | 533 | } |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | } /* unnamed namespace */ |
| 538 | |
| 539 | void |
| 540 | lower_ubo_reference(struct gl_shader *shader, exec_list *instructions) |
| 541 | { |
| 542 | lower_ubo_reference_visitor v(shader); |
| 543 | |
| 544 | /* Loop over the instructions lowering references, because we take |
| 545 | * a deref of a UBO array using a UBO dereference as the index will |
| 546 | * produce a collection of instructions all of which have cloned |
| 547 | * UBO dereferences for that array index. |
| 548 | */ |
| 549 | do { |
| 550 | v.progress = false; |
| 551 | visit_list_elements(&v, instructions); |
| 552 | } while (v.progress); |
| 553 | } |