1 /* 2 * Copyright 2010 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 #include "ir.h" 25 #include "program/symbol_table.h" 26 #include "glsl_parser_extras.h" 27 #include "ast.h" 28 #include "glsl_types.h" 29 30 ir_rvalue * 31 _mesa_ast_field_selection_to_hir(const ast_expression *expr, 32 exec_list *instructions, 33 struct _mesa_glsl_parse_state *state) 34 { 35 void *ctx = state; 36 ir_rvalue *result = NULL; 37 ir_rvalue *op; 38 39 op = expr->subexpressions[0]->hir(instructions, state); 40 41 /* There are two kinds of field selection. There is the selection of a 42 * specific field from a structure, and there is the selection of a 43 * swizzle / mask from a vector. Which is which is determined entirely 44 * by the base type of the thing to which the field selection operator is 45 * being applied. 46 */ 47 YYLTYPE loc = expr->get_location(); 48 if (op->type->is_error()) { 49 /* silently propagate the error */ 50 } else if (op->type->is_vector()) { 51 ir_swizzle *swiz = ir_swizzle::create(op, 52 expr->primary_expression.identifier, 53 op->type->vector_elements); 54 if (swiz != NULL) { 55 result = swiz; 56 } else { 57 /* FINISHME: Logging of error messages should be moved into 58 * FINISHME: ir_swizzle::create. This allows the generation of more 59 * FINISHME: specific error messages. 60 */ 61 _mesa_glsl_error(& loc, state, "Invalid swizzle / mask `%s'", 62 expr->primary_expression.identifier); 63 } 64 } else if (op->type->base_type == GLSL_TYPE_STRUCT) { 65 result = new(ctx) ir_dereference_record(op, 66 expr->primary_expression.identifier); 67 68 if (result->type->is_error()) { 69 _mesa_glsl_error(& loc, state, "Cannot access field `%s' of " 70 "structure", 71 expr->primary_expression.identifier); 72 } 73 } else if (expr->subexpressions[1] != NULL) { 74 /* Handle "method calls" in GLSL 1.20 - namely, array.length() */ 75 if (state->language_version < 120) 76 _mesa_glsl_error(&loc, state, "Methods not supported in GLSL 1.10."); 77 78 ast_expression *call = expr->subexpressions[1]; 79 assert(call->oper == ast_function_call); 80 81 const char *method; 82 method = call->subexpressions[0]->primary_expression.identifier; 83 84 if (op->type->is_array() && strcmp(method, "length") == 0) { 85 if (!call->expressions.is_empty()) 86 _mesa_glsl_error(&loc, state, "length method takes no arguments."); 87 88 if (op->type->array_size() == 0) 89 _mesa_glsl_error(&loc, state, "length called on unsized array."); 90 91 result = new(ctx) ir_constant(op->type->array_size()); 92 } else { 93 _mesa_glsl_error(&loc, state, "Unknown method: `%s'.", method); 94 } 95 } else { 96 _mesa_glsl_error(& loc, state, "Cannot access field `%s' of " 97 "non-structure / non-vector.", 98 expr->primary_expression.identifier); 99 } 100 101 return result ? result : ir_rvalue::error_value(ctx); 102 } 103
