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/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "ir.h"
#include "program/symbol_table.h"
#include "glsl_parser_extras.h"
#include "ast.h"
#include "glsl_types.h"
ir_rvalue *
_mesa_ast_field_selection_to_hir(const ast_expression *expr,
exec_list *instructions,
struct _mesa_glsl_parse_state *state)
{
void *ctx = state;
ir_rvalue *result = NULL;
ir_rvalue *op;
op = expr->subexpressions[0]->hir(instructions, state);
/* There are two kinds of field selection. There is the selection of a
* specific field from a structure, and there is the selection of a
* swizzle / mask from a vector. Which is which is determined entirely
* by the base type of the thing to which the field selection operator is
* being applied.
*/
YYLTYPE loc = expr->get_location();
if (op->type->is_error()) {
/* silently propagate the error */
} else if (op->type->base_type == GLSL_TYPE_STRUCT
|| op->type->base_type == GLSL_TYPE_INTERFACE) {
result = new(ctx) ir_dereference_record(op,
expr->primary_expression.identifier);
if (result->type->is_error()) {
_mesa_glsl_error(& loc, state, "cannot access field `%s' of "
"structure",
expr->primary_expression.identifier);
}
} else if (expr->subexpressions[1] != NULL) {
/* Handle "method calls" in GLSL 1.20 - namely, array.length() */
state->check_version(120, 300, &loc, "methods not supported");
ast_expression *call = expr->subexpressions[1];
assert(call->oper == ast_function_call);
const char *method;
method = call->subexpressions[0]->primary_expression.identifier;
if (strcmp(method, "length") == 0) {
if (!call->expressions.is_empty())
_mesa_glsl_error(&loc, state, "length method takes no arguments");
if (op->type->is_array()) {
if (op->type->is_unsized_array())
_mesa_glsl_error(&loc, state, "length called on unsized array");
result = new(ctx) ir_constant(op->type->array_size());
} else if (op->type->is_vector()) {
if (state->ARB_shading_language_420pack_enable) {
/* .length() returns int. */
result = new(ctx) ir_constant((int) op->type->vector_elements);
} else {
_mesa_glsl_error(&loc, state, "length method on matrix only available"
"with ARB_shading_language_420pack");
}
} else if (op->type->is_matrix()) {
if (state->ARB_shading_language_420pack_enable) {
/* .length() returns int. */
result = new(ctx) ir_constant((int) op->type->matrix_columns);
} else {
_mesa_glsl_error(&loc, state, "length method on matrix only available"
"with ARB_shading_language_420pack");
}
}
} else {
_mesa_glsl_error(&loc, state, "unknown method: `%s'", method);
}
} else if (op->type->is_vector() ||
(state->ARB_shading_language_420pack_enable &&
op->type->is_scalar())) {
ir_swizzle *swiz = ir_swizzle::create(op,
expr->primary_expression.identifier,
op->type->vector_elements);
if (swiz != NULL) {
result = swiz;
} else {
/* FINISHME: Logging of error messages should be moved into
* FINISHME: ir_swizzle::create. This allows the generation of more
* FINISHME: specific error messages.
*/
_mesa_glsl_error(& loc, state, "invalid swizzle / mask `%s'",
expr->primary_expression.identifier);
}
} else {
_mesa_glsl_error(& loc, state, "cannot access field `%s' of "
"non-structure / non-vector",
expr->primary_expression.identifier);
}
return result ? result : ir_rvalue::error_value(ctx);
}
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