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