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  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->base_type == GLSL_TYPE_STRUCT
  51.               || op->type->base_type == GLSL_TYPE_INTERFACE) {
  52.       result = new(ctx) ir_dereference_record(op,
  53.                                               expr->primary_expression.identifier);
  54.  
  55.       if (result->type->is_error()) {
  56.          _mesa_glsl_error(& loc, state, "Cannot access field `%s' of "
  57.                           "structure",
  58.                           expr->primary_expression.identifier);
  59.       }
  60.    } else if (expr->subexpressions[1] != NULL) {
  61.       /* Handle "method calls" in GLSL 1.20 - namely, array.length() */
  62.       state->check_version(120, 300, &loc, "Methods not supported");
  63.  
  64.       ast_expression *call = expr->subexpressions[1];
  65.       assert(call->oper == ast_function_call);
  66.  
  67.       const char *method;
  68.       method = call->subexpressions[0]->primary_expression.identifier;
  69.  
  70.       if (strcmp(method, "length") == 0) {
  71.          if (!call->expressions.is_empty())
  72.             _mesa_glsl_error(&loc, state, "length method takes no arguments.");
  73.  
  74.          if (op->type->is_array()) {
  75.             if (op->type->array_size() == 0)
  76.                _mesa_glsl_error(&loc, state, "length called on unsized array.");
  77.  
  78.             result = new(ctx) ir_constant(op->type->array_size());
  79.          } else if (op->type->is_vector()) {
  80.             if (state->ARB_shading_language_420pack_enable) {
  81.                /* .length() returns int. */
  82.                result = new(ctx) ir_constant((int) op->type->vector_elements);
  83.             } else {
  84.                _mesa_glsl_error(&loc, state, "length method on matrix only available"
  85.                                              "with ARB_shading_language_420pack.");
  86.             }
  87.          } else if (op->type->is_matrix()) {
  88.             if (state->ARB_shading_language_420pack_enable) {
  89.                /* .length() returns int. */
  90.                result = new(ctx) ir_constant((int) op->type->matrix_columns);
  91.             } else {
  92.                _mesa_glsl_error(&loc, state, "length method on matrix only available"
  93.                                              "with ARB_shading_language_420pack.");
  94.             }
  95.          }
  96.       } else {
  97.          _mesa_glsl_error(&loc, state, "Unknown method: `%s'.", method);
  98.       }
  99.    } else if (op->type->is_vector() ||
  100.               (state->ARB_shading_language_420pack_enable &&
  101.                op->type->is_scalar())) {
  102.       ir_swizzle *swiz = ir_swizzle::create(op,
  103.                                             expr->primary_expression.identifier,
  104.                                             op->type->vector_elements);
  105.       if (swiz != NULL) {
  106.          result = swiz;
  107.       } else {
  108.          /* FINISHME: Logging of error messages should be moved into
  109.           * FINISHME: ir_swizzle::create.  This allows the generation of more
  110.           * FINISHME: specific error messages.
  111.           */
  112.          _mesa_glsl_error(& loc, state, "Invalid swizzle / mask `%s'",
  113.                           expr->primary_expression.identifier);
  114.       }
  115.    } else {
  116.       _mesa_glsl_error(& loc, state, "Cannot access field `%s' of "
  117.                        "non-structure / non-vector.",
  118.                        expr->primary_expression.identifier);
  119.    }
  120.  
  121.    return result ? result : ir_rvalue::error_value(ctx);
  122. }
  123.