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glsl: Add a constant_referenced method to ir_dereference*

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The method is used to get a reference to an ir_constant * within the
context of evaluating an assignment when calculating a
constant_expression_value.

Signed-off-by: Olivier Galibert <galibert@pobox.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net> [v1]
This commit is contained in:
Olivier Galibert
2012-05-02 23:11:39 +02:00
committed by Kenneth Graunke
parent 6e4852a3a5
commit a270e86d38
2 changed files with 128 additions and 0 deletions
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92
src/glsl/ir_constant_expression.cpp
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@@ -923,6 +923,19 @@ ir_swizzle::constant_expression_value(struct hash_table *variable_context)
}
void
ir_dereference_variable::constant_referenced(struct hash_table *variable_context,
ir_constant *&store, int &offset) const
{
if (variable_context) {
store = (ir_constant *)hash_table_find(variable_context, var);
offset = 0;
} else {
store = NULL;
offset = 0;
}
}
ir_constant *
ir_dereference_variable::constant_expression_value(struct hash_table *variable_context)
{
@@ -950,6 +963,60 @@ ir_dereference_variable::constant_expression_value(struct hash_table *variable_c
}
void
ir_dereference_array::constant_referenced(struct hash_table *variable_context,
ir_constant *&store, int &offset) const
{
ir_constant *index_c = array_index->constant_expression_value(variable_context);
if (!index_c || !index_c->type->is_scalar() || !index_c->type->is_integer()) {
store = 0;
offset = 0;
return;
}
int index = index_c->type->base_type == GLSL_TYPE_INT ?
index_c->get_int_component(0) :
index_c->get_uint_component(0);
ir_constant *substore;
int suboffset;
const ir_dereference *deref = array->as_dereference();
if (!deref) {
store = 0;
offset = 0;
return;
}
deref->constant_referenced(variable_context, substore, suboffset);
if (!substore) {
store = 0;
offset = 0;
return;
}
const glsl_type *vt = substore->type;
if (vt->is_array()) {
store = substore->get_array_element(index);
offset = 0;
return;
}
if (vt->is_matrix()) {
store = substore;
offset = index * vt->vector_elements;
return;
}
if (vt->is_vector()) {
store = substore;
offset = suboffset + index;
return;
}
store = 0;
offset = 0;
}
ir_constant *
ir_dereference_array::constant_expression_value(struct hash_table *variable_context)
{
@@ -1005,6 +1072,31 @@ ir_dereference_array::constant_expression_value(struct hash_table *variable_cont
}
void
ir_dereference_record::constant_referenced(struct hash_table *variable_context,
ir_constant *&store, int &offset) const
{
ir_constant *substore;
int suboffset;
const ir_dereference *deref = record->as_dereference();
if (!deref) {
store = 0;
offset = 0;
return;
}
deref->constant_referenced(variable_context, substore, suboffset);
if (!substore) {
store = 0;
offset = 0;
return;
}
store = substore->get_record_field(field);
offset = 0;
}
ir_constant *
ir_dereference_record::constant_expression_value(struct hash_table *variable_context)
{