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 "glsl_parser_extras.h" 26 #include "ast.h" 27 #include "compiler/glsl_types.h" 28 29 ir_rvalue * 30 _mesa_ast_field_selection_to_hir(const ast_expression *expr, 31 exec_list *instructions, 32 struct _mesa_glsl_parse_state *state) 33 { 34 void *ctx = state; 35 ir_rvalue *result = NULL; 36 ir_rvalue *op; 37 38 op = expr->subexpressions[0]->hir(instructions, state); 39 40 /* There are two kinds of field selection. There is the selection of a 41 * specific field from a structure, and there is the selection of a 42 * swizzle / mask from a vector. Which is which is determined entirely 43 * by the base type of the thing to which the field selection operator is 44 * being applied. 45 */ 46 YYLTYPE loc = expr->get_location(); 47 if (op->type->is_error()) { 48 /* silently propagate the error */ 49 } else if (op->type->base_type == GLSL_TYPE_STRUCT 50 || op->type->base_type == GLSL_TYPE_INTERFACE) { 51 result = new(ctx) ir_dereference_record(op, 52 expr->primary_expression.identifier); 53 54 if (result->type->is_error()) { 55 _mesa_glsl_error(& loc, state, "cannot access field `%s' of " 56 "structure", 57 expr->primary_expression.identifier); 58 } 59 } else if (op->type->is_vector() || 60 (state->has_420pack() && op->type->is_scalar())) { 61 ir_swizzle *swiz = ir_swizzle::create(op, 62 expr->primary_expression.identifier, 63 op->type->vector_elements); 64 if (swiz != NULL) { 65 result = swiz; 66 } else { 67 /* FINISHME: Logging of error messages should be moved into 68 * FINISHME: ir_swizzle::create. This allows the generation of more 69 * FINISHME: specific error messages. 70 */ 71 _mesa_glsl_error(& loc, state, "invalid swizzle / mask `%s'", 72 expr->primary_expression.identifier); 73 } 74 } else { 75 _mesa_glsl_error(& loc, state, "cannot access field `%s' of " 76 "non-structure / non-vector", 77 expr->primary_expression.identifier); 78 } 79 80 return result ? result : ir_rvalue::error_value(ctx); 81 } 82