2 * Copyright © 2010 Intel Corporation
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:
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
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.
24 #include "ir_reader.h"
25 #include "glsl_parser_extras.h"
26 #include "glsl_types.h"
27 #include "s_expression.h"
29 const static bool debug = false;
33 ir_reader(_mesa_glsl_parse_state *);
35 void read(exec_list *instructions, const char *src, bool scan_for_protos);
39 _mesa_glsl_parse_state *state;
41 void ir_read_error(s_expression *, const char *fmt, ...);
43 const glsl_type *read_type(s_expression *);
45 void scan_for_prototypes(exec_list *, s_expression *);
46 ir_function *read_function(s_expression *, bool skip_body);
47 void read_function_sig(ir_function *, s_expression *, bool skip_body);
49 void read_instructions(exec_list *, s_expression *, ir_loop *);
50 ir_instruction *read_instruction(s_expression *, ir_loop *);
51 ir_variable *read_declaration(s_expression *);
52 ir_if *read_if(s_expression *, ir_loop *);
53 ir_loop *read_loop(s_expression *);
54 ir_return *read_return(s_expression *);
55 ir_rvalue *read_rvalue(s_expression *);
56 ir_assignment *read_assignment(s_expression *);
57 ir_expression *read_expression(s_expression *);
58 ir_call *read_call(s_expression *);
59 ir_swizzle *read_swizzle(s_expression *);
60 ir_constant *read_constant(s_expression *);
61 ir_texture *read_texture(s_expression *);
63 ir_dereference *read_dereference(s_expression *);
66 ir_reader::ir_reader(_mesa_glsl_parse_state *state) : state(state)
68 this->mem_ctx = state;
72 _mesa_glsl_read_ir(_mesa_glsl_parse_state *state, exec_list *instructions,
73 const char *src, bool scan_for_protos)
76 r.read(instructions, src, scan_for_protos);
80 ir_reader::read(exec_list *instructions, const char *src, bool scan_for_protos)
82 s_expression *expr = s_expression::read_expression(mem_ctx, src);
84 ir_read_error(NULL, "couldn't parse S-Expression.");
88 if (scan_for_protos) {
89 scan_for_prototypes(instructions, expr);
94 read_instructions(instructions, expr, NULL);
98 validate_ir_tree(instructions);
102 ir_reader::ir_read_error(s_expression *expr, const char *fmt, ...)
108 if (state->current_function != NULL)
109 ralloc_asprintf_append(&state->info_log, "In function %s:\n",
110 state->current_function->function_name());
111 ralloc_strcat(&state->info_log, "error: ");
114 ralloc_vasprintf_append(&state->info_log, fmt, ap);
116 ralloc_strcat(&state->info_log, "\n");
119 ralloc_strcat(&state->info_log, "...in this context:\n ");
121 ralloc_strcat(&state->info_log, "\n\n");
126 ir_reader::read_type(s_expression *expr)
128 s_expression *s_base_type;
131 s_pattern pat[] = { "array", s_base_type, s_size };
132 if (MATCH(expr, pat)) {
133 const glsl_type *base_type = read_type(s_base_type);
134 if (base_type == NULL) {
135 ir_read_error(NULL, "when reading base type of array type");
139 return glsl_type::get_array_instance(base_type, s_size->value());
142 s_symbol *type_sym = SX_AS_SYMBOL(expr);
143 if (type_sym == NULL) {
144 ir_read_error(expr, "expected <type>");
148 const glsl_type *type = state->symbols->get_type(type_sym->value());
150 ir_read_error(expr, "invalid type: %s", type_sym->value());
157 ir_reader::scan_for_prototypes(exec_list *instructions, s_expression *expr)
159 s_list *list = SX_AS_LIST(expr);
161 ir_read_error(expr, "Expected (<instruction> ...); found an atom.");
165 foreach_iter(exec_list_iterator, it, list->subexpressions) {
166 s_list *sub = SX_AS_LIST(it.get());
168 continue; // not a (function ...); ignore it.
170 s_symbol *tag = SX_AS_SYMBOL(sub->subexpressions.get_head());
171 if (tag == NULL || strcmp(tag->value(), "function") != 0)
172 continue; // not a (function ...); ignore it.
174 ir_function *f = read_function(sub, true);
177 instructions->push_tail(f);
182 ir_reader::read_function(s_expression *expr, bool skip_body)
187 s_pattern pat[] = { "function", name };
188 if (!PARTIAL_MATCH(expr, pat)) {
189 ir_read_error(expr, "Expected (function <name> (signature ...) ...)");
193 ir_function *f = state->symbols->get_function(name->value());
195 f = new(mem_ctx) ir_function(name->value());
196 added = state->symbols->add_function(f);
200 exec_list_iterator it = ((s_list *) expr)->subexpressions.iterator();
201 it.next(); // skip "function" tag
202 it.next(); // skip function name
203 for (/* nothing */; it.has_next(); it.next()) {
204 s_expression *s_sig = (s_expression *) it.get();
205 read_function_sig(f, s_sig, skip_body);
207 return added ? f : NULL;
211 ir_reader::read_function_sig(ir_function *f, s_expression *expr, bool skip_body)
213 s_expression *type_expr;
217 s_pattern pat[] = { "signature", type_expr, paramlist, body_list };
218 if (!MATCH(expr, pat)) {
219 ir_read_error(expr, "Expected (signature <type> (parameters ...) "
220 "(<instruction> ...))");
224 const glsl_type *return_type = read_type(type_expr);
225 if (return_type == NULL)
228 s_symbol *paramtag = SX_AS_SYMBOL(paramlist->subexpressions.get_head());
229 if (paramtag == NULL || strcmp(paramtag->value(), "parameters") != 0) {
230 ir_read_error(paramlist, "Expected (parameters ...)");
234 // Read the parameters list into a temporary place.
235 exec_list hir_parameters;
236 state->symbols->push_scope();
238 exec_list_iterator it = paramlist->subexpressions.iterator();
239 for (it.next() /* skip "parameters" */; it.has_next(); it.next()) {
240 ir_variable *var = read_declaration((s_expression *) it.get());
244 hir_parameters.push_tail(var);
247 ir_function_signature *sig = f->exact_matching_signature(&hir_parameters);
248 if (sig == NULL && skip_body) {
249 /* If scanning for prototypes, generate a new signature. */
250 sig = new(mem_ctx) ir_function_signature(return_type);
251 sig->is_builtin = true;
252 f->add_signature(sig);
253 } else if (sig != NULL) {
254 const char *badvar = sig->qualifiers_match(&hir_parameters);
255 if (badvar != NULL) {
256 ir_read_error(expr, "function `%s' parameter `%s' qualifiers "
257 "don't match prototype", f->name, badvar);
261 if (sig->return_type != return_type) {
262 ir_read_error(expr, "function `%s' return type doesn't "
263 "match prototype", f->name);
267 /* No prototype for this body exists - skip it. */
268 state->symbols->pop_scope();
273 sig->replace_parameters(&hir_parameters);
275 if (!skip_body && !body_list->subexpressions.is_empty()) {
276 if (sig->is_defined) {
277 ir_read_error(expr, "function %s redefined", f->name);
280 state->current_function = sig;
281 read_instructions(&sig->body, body_list, NULL);
282 state->current_function = NULL;
283 sig->is_defined = true;
286 state->symbols->pop_scope();
290 ir_reader::read_instructions(exec_list *instructions, s_expression *expr,
293 // Read in a list of instructions
294 s_list *list = SX_AS_LIST(expr);
296 ir_read_error(expr, "Expected (<instruction> ...); found an atom.");
300 foreach_iter(exec_list_iterator, it, list->subexpressions) {
301 s_expression *sub = (s_expression*) it.get();
302 ir_instruction *ir = read_instruction(sub, loop_ctx);
304 /* Global variable declarations should be moved to the top, before
305 * any functions that might use them. Functions are added to the
306 * instruction stream when scanning for prototypes, so without this
307 * hack, they always appear before variable declarations.
309 if (state->current_function == NULL && ir->as_variable() != NULL)
310 instructions->push_head(ir);
312 instructions->push_tail(ir);
319 ir_reader::read_instruction(s_expression *expr, ir_loop *loop_ctx)
321 s_symbol *symbol = SX_AS_SYMBOL(expr);
322 if (symbol != NULL) {
323 if (strcmp(symbol->value(), "break") == 0 && loop_ctx != NULL)
324 return new(mem_ctx) ir_loop_jump(ir_loop_jump::jump_break);
325 if (strcmp(symbol->value(), "continue") == 0 && loop_ctx != NULL)
326 return new(mem_ctx) ir_loop_jump(ir_loop_jump::jump_continue);
329 s_list *list = SX_AS_LIST(expr);
330 if (list == NULL || list->subexpressions.is_empty()) {
331 ir_read_error(expr, "Invalid instruction.\n");
335 s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head());
337 ir_read_error(expr, "expected instruction tag");
341 ir_instruction *inst = NULL;
342 if (strcmp(tag->value(), "declare") == 0) {
343 inst = read_declaration(list);
344 } else if (strcmp(tag->value(), "assign") == 0) {
345 inst = read_assignment(list);
346 } else if (strcmp(tag->value(), "if") == 0) {
347 inst = read_if(list, loop_ctx);
348 } else if (strcmp(tag->value(), "loop") == 0) {
349 inst = read_loop(list);
350 } else if (strcmp(tag->value(), "return") == 0) {
351 inst = read_return(list);
352 } else if (strcmp(tag->value(), "function") == 0) {
353 inst = read_function(list, false);
355 inst = read_rvalue(list);
357 ir_read_error(NULL, "when reading instruction");
363 ir_reader::read_declaration(s_expression *expr)
366 s_expression *s_type;
369 s_pattern pat[] = { "declare", s_quals, s_type, s_name };
370 if (!MATCH(expr, pat)) {
371 ir_read_error(expr, "expected (declare (<qualifiers>) <type> <name>)");
375 const glsl_type *type = read_type(s_type);
379 ir_variable *var = new(mem_ctx) ir_variable(type, s_name->value(),
382 foreach_iter(exec_list_iterator, it, s_quals->subexpressions) {
383 s_symbol *qualifier = SX_AS_SYMBOL(it.get());
384 if (qualifier == NULL) {
385 ir_read_error(expr, "qualifier list must contain only symbols");
389 // FINISHME: Check for duplicate/conflicting qualifiers.
390 if (strcmp(qualifier->value(), "centroid") == 0) {
392 } else if (strcmp(qualifier->value(), "invariant") == 0) {
394 } else if (strcmp(qualifier->value(), "uniform") == 0) {
395 var->mode = ir_var_uniform;
396 } else if (strcmp(qualifier->value(), "auto") == 0) {
397 var->mode = ir_var_auto;
398 } else if (strcmp(qualifier->value(), "in") == 0) {
399 var->mode = ir_var_in;
400 } else if (strcmp(qualifier->value(), "out") == 0) {
401 var->mode = ir_var_out;
402 } else if (strcmp(qualifier->value(), "inout") == 0) {
403 var->mode = ir_var_inout;
404 } else if (strcmp(qualifier->value(), "smooth") == 0) {
405 var->interpolation = ir_var_smooth;
406 } else if (strcmp(qualifier->value(), "flat") == 0) {
407 var->interpolation = ir_var_flat;
408 } else if (strcmp(qualifier->value(), "noperspective") == 0) {
409 var->interpolation = ir_var_noperspective;
411 ir_read_error(expr, "unknown qualifier: %s", qualifier->value());
416 // Add the variable to the symbol table
417 state->symbols->add_variable(var);
424 ir_reader::read_if(s_expression *expr, ir_loop *loop_ctx)
426 s_expression *s_cond;
427 s_expression *s_then;
428 s_expression *s_else;
430 s_pattern pat[] = { "if", s_cond, s_then, s_else };
431 if (!MATCH(expr, pat)) {
432 ir_read_error(expr, "expected (if <condition> (<then>...) (<else>...))");
436 ir_rvalue *condition = read_rvalue(s_cond);
437 if (condition == NULL) {
438 ir_read_error(NULL, "when reading condition of (if ...)");
442 ir_if *iff = new(mem_ctx) ir_if(condition);
444 read_instructions(&iff->then_instructions, s_then, loop_ctx);
445 read_instructions(&iff->else_instructions, s_else, loop_ctx);
455 ir_reader::read_loop(s_expression *expr)
457 s_expression *s_counter, *s_from, *s_to, *s_inc, *s_body;
459 s_pattern pat[] = { "loop", s_counter, s_from, s_to, s_inc, s_body };
460 if (!MATCH(expr, pat)) {
461 ir_read_error(expr, "expected (loop <counter> <from> <to> "
462 "<increment> <body>)");
466 // FINISHME: actually read the count/from/to fields.
468 ir_loop *loop = new(mem_ctx) ir_loop;
469 read_instructions(&loop->body_instructions, s_body, loop);
479 ir_reader::read_return(s_expression *expr)
481 s_expression *s_retval;
483 s_pattern pat[] = { "return", s_retval};
484 if (!MATCH(expr, pat)) {
485 ir_read_error(expr, "expected (return <rvalue>)");
489 ir_rvalue *retval = read_rvalue(s_retval);
490 if (retval == NULL) {
491 ir_read_error(NULL, "when reading return value");
495 return new(mem_ctx) ir_return(retval);
500 ir_reader::read_rvalue(s_expression *expr)
502 s_list *list = SX_AS_LIST(expr);
503 if (list == NULL || list->subexpressions.is_empty())
506 s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head());
508 ir_read_error(expr, "expected rvalue tag");
512 ir_rvalue *rvalue = read_dereference(list);
513 if (rvalue != NULL || state->error)
515 else if (strcmp(tag->value(), "swiz") == 0) {
516 rvalue = read_swizzle(list);
517 } else if (strcmp(tag->value(), "expression") == 0) {
518 rvalue = read_expression(list);
519 } else if (strcmp(tag->value(), "call") == 0) {
520 rvalue = read_call(list);
521 } else if (strcmp(tag->value(), "constant") == 0) {
522 rvalue = read_constant(list);
524 rvalue = read_texture(list);
525 if (rvalue == NULL && !state->error)
526 ir_read_error(expr, "unrecognized rvalue tag: %s", tag->value());
533 ir_reader::read_assignment(s_expression *expr)
535 s_expression *cond_expr = NULL;
536 s_expression *lhs_expr, *rhs_expr;
539 s_pattern pat4[] = { "assign", mask_list, lhs_expr, rhs_expr };
540 s_pattern pat5[] = { "assign", cond_expr, mask_list, lhs_expr, rhs_expr };
541 if (!MATCH(expr, pat4) && !MATCH(expr, pat5)) {
542 ir_read_error(expr, "expected (assign [<condition>] (<write mask>) "
547 ir_rvalue *condition = NULL;
548 if (cond_expr != NULL) {
549 condition = read_rvalue(cond_expr);
550 if (condition == NULL) {
551 ir_read_error(NULL, "when reading condition of assignment");
558 s_symbol *mask_symbol;
559 s_pattern mask_pat[] = { mask_symbol };
560 if (MATCH(mask_list, mask_pat)) {
561 const char *mask_str = mask_symbol->value();
562 unsigned mask_length = strlen(mask_str);
563 if (mask_length > 4) {
564 ir_read_error(expr, "invalid write mask: %s", mask_str);
568 const unsigned idx_map[] = { 3, 0, 1, 2 }; /* w=bit 3, x=0, y=1, z=2 */
570 for (unsigned i = 0; i < mask_length; i++) {
571 if (mask_str[i] < 'w' || mask_str[i] > 'z') {
572 ir_read_error(expr, "write mask contains invalid character: %c",
576 mask |= 1 << idx_map[mask_str[i] - 'w'];
578 } else if (!mask_list->subexpressions.is_empty()) {
579 ir_read_error(mask_list, "expected () or (<write mask>)");
583 ir_dereference *lhs = read_dereference(lhs_expr);
585 ir_read_error(NULL, "when reading left-hand side of assignment");
589 ir_rvalue *rhs = read_rvalue(rhs_expr);
591 ir_read_error(NULL, "when reading right-hand side of assignment");
595 if (mask == 0 && (lhs->type->is_vector() || lhs->type->is_scalar())) {
596 ir_read_error(expr, "non-zero write mask required.");
600 return new(mem_ctx) ir_assignment(lhs, rhs, condition, mask);
604 ir_reader::read_call(s_expression *expr)
609 s_pattern pat[] = { "call", name, params };
610 if (!MATCH(expr, pat)) {
611 ir_read_error(expr, "expected (call <name> (<param> ...))");
615 exec_list parameters;
617 foreach_iter(exec_list_iterator, it, params->subexpressions) {
618 s_expression *expr = (s_expression*) it.get();
619 ir_rvalue *param = read_rvalue(expr);
621 ir_read_error(expr, "when reading parameter to function call");
624 parameters.push_tail(param);
627 ir_function *f = state->symbols->get_function(name->value());
629 ir_read_error(expr, "found call to undefined function %s",
634 ir_function_signature *callee = f->matching_signature(¶meters);
635 if (callee == NULL) {
636 ir_read_error(expr, "couldn't find matching signature for function "
637 "%s", name->value());
641 return new(mem_ctx) ir_call(callee, ¶meters);
645 ir_reader::read_expression(s_expression *expr)
647 s_expression *s_type;
649 s_expression *s_arg1;
651 s_pattern pat[] = { "expression", s_type, s_op, s_arg1 };
652 if (!PARTIAL_MATCH(expr, pat)) {
653 ir_read_error(expr, "expected (expression <type> <operator> "
654 "<operand> [<operand>])");
657 s_expression *s_arg2 = (s_expression *) s_arg1->next; // may be tail sentinel
659 const glsl_type *type = read_type(s_type);
663 /* Read the operator */
664 ir_expression_operation op = ir_expression::get_operator(s_op->value());
665 if (op == (ir_expression_operation) -1) {
666 ir_read_error(expr, "invalid operator: %s", s_op->value());
670 unsigned num_operands = ir_expression::get_num_operands(op);
671 if (num_operands == 1 && !s_arg1->next->is_tail_sentinel()) {
672 ir_read_error(expr, "expected (expression <type> %s <operand>)",
677 ir_rvalue *arg1 = read_rvalue(s_arg1);
678 ir_rvalue *arg2 = NULL;
680 ir_read_error(NULL, "when reading first operand of %s", s_op->value());
684 if (num_operands == 2) {
685 if (s_arg2->is_tail_sentinel() || !s_arg2->next->is_tail_sentinel()) {
686 ir_read_error(expr, "expected (expression <type> %s <operand> "
687 "<operand>)", s_op->value());
690 arg2 = read_rvalue(s_arg2);
692 ir_read_error(NULL, "when reading second operand of %s",
698 return new(mem_ctx) ir_expression(op, type, arg1, arg2);
702 ir_reader::read_swizzle(s_expression *expr)
707 s_pattern pat[] = { "swiz", swiz, sub };
708 if (!MATCH(expr, pat)) {
709 ir_read_error(expr, "expected (swiz <swizzle> <rvalue>)");
713 if (strlen(swiz->value()) > 4) {
714 ir_read_error(expr, "expected a valid swizzle; found %s", swiz->value());
718 ir_rvalue *rvalue = read_rvalue(sub);
722 ir_swizzle *ir = ir_swizzle::create(rvalue, swiz->value(),
723 rvalue->type->vector_elements);
725 ir_read_error(expr, "invalid swizzle");
731 ir_reader::read_constant(s_expression *expr)
733 s_expression *type_expr;
736 s_pattern pat[] = { "constant", type_expr, values };
737 if (!MATCH(expr, pat)) {
738 ir_read_error(expr, "expected (constant <type> (...))");
742 const glsl_type *type = read_type(type_expr);
746 if (values == NULL) {
747 ir_read_error(expr, "expected (constant <type> (...))");
751 if (type->is_array()) {
752 unsigned elements_supplied = 0;
754 foreach_iter(exec_list_iterator, it, values->subexpressions) {
755 s_expression *elt = (s_expression *) it.get();
756 ir_constant *ir_elt = read_constant(elt);
759 elements.push_tail(ir_elt);
763 if (elements_supplied != type->length) {
764 ir_read_error(values, "expected exactly %u array elements, "
765 "given %u", type->length, elements_supplied);
768 return new(mem_ctx) ir_constant(type, &elements);
771 const glsl_type *const base_type = type->get_base_type();
773 ir_constant_data data = { { 0 } };
775 // Read in list of values (at most 16).
777 foreach_iter(exec_list_iterator, it, values->subexpressions) {
779 ir_read_error(values, "expected at most 16 numbers");
783 s_expression *expr = (s_expression*) it.get();
785 if (base_type->base_type == GLSL_TYPE_FLOAT) {
786 s_number *value = SX_AS_NUMBER(expr);
788 ir_read_error(values, "expected numbers");
791 data.f[k] = value->fvalue();
793 s_int *value = SX_AS_INT(expr);
795 ir_read_error(values, "expected integers");
799 switch (base_type->base_type) {
800 case GLSL_TYPE_UINT: {
801 data.u[k] = value->value();
804 case GLSL_TYPE_INT: {
805 data.i[k] = value->value();
808 case GLSL_TYPE_BOOL: {
809 data.b[k] = value->value();
813 ir_read_error(values, "unsupported constant type");
820 return new(mem_ctx) ir_constant(type, &data);
824 ir_reader::read_dereference(s_expression *expr)
827 s_expression *s_subject;
828 s_expression *s_index;
831 s_pattern var_pat[] = { "var_ref", s_var };
832 s_pattern array_pat[] = { "array_ref", s_subject, s_index };
833 s_pattern record_pat[] = { "record_ref", s_subject, s_field };
835 if (MATCH(expr, var_pat)) {
836 ir_variable *var = state->symbols->get_variable(s_var->value());
838 ir_read_error(expr, "undeclared variable: %s", s_var->value());
841 return new(mem_ctx) ir_dereference_variable(var);
842 } else if (MATCH(expr, array_pat)) {
843 ir_rvalue *subject = read_rvalue(s_subject);
844 if (subject == NULL) {
845 ir_read_error(NULL, "when reading the subject of an array_ref");
849 ir_rvalue *idx = read_rvalue(s_index);
850 if (subject == NULL) {
851 ir_read_error(NULL, "when reading the index of an array_ref");
854 return new(mem_ctx) ir_dereference_array(subject, idx);
855 } else if (MATCH(expr, record_pat)) {
856 ir_rvalue *subject = read_rvalue(s_subject);
857 if (subject == NULL) {
858 ir_read_error(NULL, "when reading the subject of a record_ref");
861 return new(mem_ctx) ir_dereference_record(subject, s_field->value());
867 ir_reader::read_texture(s_expression *expr)
869 s_symbol *tag = NULL;
870 s_expression *s_sampler = NULL;
871 s_expression *s_coord = NULL;
872 s_expression *s_offset = NULL;
873 s_expression *s_proj = NULL;
874 s_list *s_shadow = NULL;
875 s_expression *s_lod = NULL;
877 ir_texture_opcode op = ir_tex; /* silence warning */
879 s_pattern tex_pattern[] =
880 { "tex", s_sampler, s_coord, s_offset, s_proj, s_shadow };
881 s_pattern txf_pattern[] =
882 { "txf", s_sampler, s_coord, s_offset, s_lod };
883 s_pattern other_pattern[] =
884 { tag, s_sampler, s_coord, s_offset, s_proj, s_shadow, s_lod };
886 if (MATCH(expr, tex_pattern)) {
888 } else if (MATCH(expr, txf_pattern)) {
890 } else if (MATCH(expr, other_pattern)) {
891 op = ir_texture::get_opcode(tag->value());
895 ir_read_error(NULL, "unexpected texture pattern");
899 ir_texture *tex = new(mem_ctx) ir_texture(op);
901 // Read sampler (must be a deref)
902 ir_dereference *sampler = read_dereference(s_sampler);
903 if (sampler == NULL) {
904 ir_read_error(NULL, "when reading sampler in (%s ...)",
905 tex->opcode_string());
908 tex->set_sampler(sampler);
910 // Read coordinate (any rvalue)
911 tex->coordinate = read_rvalue(s_coord);
912 if (tex->coordinate == NULL) {
913 ir_read_error(NULL, "when reading coordinate in (%s ...)",
914 tex->opcode_string());
918 // Read texel offset - either 0 or an rvalue.
919 s_int *si_offset = SX_AS_INT(s_offset);
920 if (si_offset == NULL || si_offset->value() != 0) {
921 tex->offset = read_rvalue(s_offset);
922 if (tex->offset == NULL) {
923 ir_read_error(s_offset, "expected 0 or an expression");
929 s_int *proj_as_int = SX_AS_INT(s_proj);
930 if (proj_as_int && proj_as_int->value() == 1) {
931 tex->projector = NULL;
933 tex->projector = read_rvalue(s_proj);
934 if (tex->projector == NULL) {
935 ir_read_error(NULL, "when reading projective divide in (%s ..)",
936 tex->opcode_string());
941 if (s_shadow->subexpressions.is_empty()) {
942 tex->shadow_comparitor = NULL;
944 tex->shadow_comparitor = read_rvalue(s_shadow);
945 if (tex->shadow_comparitor == NULL) {
946 ir_read_error(NULL, "when reading shadow comparitor in (%s ..)",
947 tex->opcode_string());
955 tex->lod_info.bias = read_rvalue(s_lod);
956 if (tex->lod_info.bias == NULL) {
957 ir_read_error(NULL, "when reading LOD bias in (txb ...)");
963 tex->lod_info.lod = read_rvalue(s_lod);
964 if (tex->lod_info.lod == NULL) {
965 ir_read_error(NULL, "when reading LOD in (%s ...)",
966 tex->opcode_string());
971 s_expression *s_dx, *s_dy;
972 s_pattern dxdy_pat[] = { s_dx, s_dy };
973 if (!MATCH(s_lod, dxdy_pat)) {
974 ir_read_error(s_lod, "expected (dPdx dPdy) in (txd ...)");
977 tex->lod_info.grad.dPdx = read_rvalue(s_dx);
978 if (tex->lod_info.grad.dPdx == NULL) {
979 ir_read_error(NULL, "when reading dPdx in (txd ...)");
982 tex->lod_info.grad.dPdy = read_rvalue(s_dy);
983 if (tex->lod_info.grad.dPdy == NULL) {
984 ir_read_error(NULL, "when reading dPdy in (txd ...)");
990 // tex doesn't have any extra parameters.