diff options
Diffstat (limited to 'src/glsl')
| -rw-r--r-- | src/glsl/ast_function.cpp | 76 |
1 files changed, 71 insertions, 5 deletions
diff --git a/src/glsl/ast_function.cpp b/src/glsl/ast_function.cpp index 5b6ed3bc8f5..c49a33d0486 100644 --- a/src/glsl/ast_function.cpp +++ b/src/glsl/ast_function.cpp @@ -134,6 +134,8 @@ match_function_by_name(exec_list *instructions, const char *name, } } + exec_list post_call_conversions; + if (sig != NULL) { /* Verify that 'out' and 'inout' actual parameters are lvalues. This * isn't done in ir_function::matching_signature because that function @@ -141,6 +143,12 @@ match_function_by_name(exec_list *instructions, const char *name, * * Also, validate that 'const_in' formal parameters (an extension of our * IR) correspond to ir_constant actual parameters. + * + * Also, perform implicit conversion of arguments. Note: to implicitly + * convert out parameters, we need to place them in a temporary + * variable, and do the conversion after the call takes place. Since we + * haven't emitted the call yet, we'll place the post-call conversions + * in a temporary exec_list, and emit them later. */ exec_list_iterator actual_iter = actual_parameters->iterator(); exec_list_iterator formal_iter = sig->parameters.iterator(); @@ -185,8 +193,63 @@ match_function_by_name(exec_list *instructions, const char *name, } if (formal->type->is_numeric() || formal->type->is_boolean()) { - ir_rvalue *converted = convert_component(actual, formal->type); - actual->replace_with(converted); + switch (formal->mode) { + case ir_var_in: { + ir_rvalue *converted + = convert_component(actual, formal->type); + actual->replace_with(converted); + break; + } + case ir_var_out: + if (actual->type != formal->type) { + /* To convert an out parameter, we need to create a + * temporary variable to hold the value before conversion, + * and then perform the conversion after the function call + * returns. + * + * This has the effect of transforming code like this: + * + * void f(out int x); + * float value; + * f(value); + * + * Into IR that's equivalent to this: + * + * void f(out int x); + * float value; + * int out_parameter_conversion; + * f(out_parameter_conversion); + * value = float(out_parameter_conversion); + */ + ir_variable *tmp = + new(ctx) ir_variable(formal->type, + "out_parameter_conversion", + ir_var_temporary); + instructions->push_tail(tmp); + ir_dereference_variable *deref_tmp_1 + = new(ctx) ir_dereference_variable(tmp); + ir_dereference_variable *deref_tmp_2 + = new(ctx) ir_dereference_variable(tmp); + ir_rvalue *converted_tmp + = convert_component(deref_tmp_1, actual->type); + ir_assignment *assignment + = new(ctx) ir_assignment(actual, converted_tmp); + post_call_conversions.push_tail(assignment); + actual->replace_with(deref_tmp_2); + } + break; + case ir_var_inout: + /* Inout parameters should never require conversion, since that + * would require an implicit conversion to exist both to and + * from the formal parameter type, and there are no + * bidirectional implicit conversions. + */ + assert (actual->type == formal->type); + break; + default: + assert (!"Illegal formal parameter mode"); + break; + } } actual_iter.next(); @@ -196,8 +259,11 @@ match_function_by_name(exec_list *instructions, const char *name, /* Always insert the call in the instruction stream, and return a deref * of its return val if it returns a value, since we don't know if * the rvalue is going to be assigned to anything or not. + * + * Also insert any out parameter conversions after the call. */ ir_call *call = new(ctx) ir_call(sig, actual_parameters); + ir_dereference_variable *deref; if (!sig->return_type->is_void()) { /* If the function call is a constant expression, don't * generate the instructions to call it; just generate an @@ -214,7 +280,6 @@ match_function_by_name(exec_list *instructions, const char *name, } ir_variable *var; - ir_dereference_variable *deref; var = new(ctx) ir_variable(sig->return_type, ralloc_asprintf(ctx, "%s_retval", @@ -227,11 +292,12 @@ match_function_by_name(exec_list *instructions, const char *name, instructions->push_tail(assign); deref = new(ctx) ir_dereference_variable(var); - return deref; } else { instructions->push_tail(call); - return NULL; + deref = NULL; } + instructions->append_list(&post_call_conversions); + return deref; } else { char *str = prototype_string(NULL, name, actual_parameters); |