From 42a29d89fd85c86387f0d119950e243b6de76d79 Mon Sep 17 00:00:00 2001 From: Paul Berry Date: Fri, 11 Jan 2013 14:39:32 -0800 Subject: glsl: Eliminate ambiguity between function ins/outs and shader ins/outs This patch replaces the three ir_variable_mode enums: - ir_var_in - ir_var_out - ir_var_inout with the following five: - ir_var_shader_in - ir_var_shader_out - ir_var_function_in - ir_var_function_out - ir_var_function_inout This eliminates a frustrating ambiguity: it used to be impossible to tell whether an ir_var_{in,out} variable was a shader in/out or a function in/out without seeing where the variable was declared in the IR. This complicated some optimization and lowering passes, and would have become a problem for implementing varying structs. In the lisp-style serialization of GLSL IR to strings performed by ir_print_visitor.cpp and ir_reader.cpp, I've retained the names "in", "out", and "inout" for function parameters, to avoid introducing code churn to the src/glsl/builtins/ir/ directory. Note: a couple of comments in the code seemed to indicate that we were planning for a possible future in which geometry shaders could have shader-scope inout variables. Our GLSL grammar rejects shader-scope inout variables, and I've been unable to find any evidence in the GLSL standards documents (or extensions) that this will ever be allowed, so I've eliminated these comments. Reviewed-by: Carl Worth Reviewed-by: Jordan Justen Reviewed-by: Eric Anholt --- src/glsl/opt_copy_propagation.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'src/glsl/opt_copy_propagation.cpp') diff --git a/src/glsl/opt_copy_propagation.cpp b/src/glsl/opt_copy_propagation.cpp index 2952ce594f7..7282b611ebc 100644 --- a/src/glsl/opt_copy_propagation.cpp +++ b/src/glsl/opt_copy_propagation.cpp @@ -189,7 +189,8 @@ ir_copy_propagation_visitor::visit_enter(ir_call *ir) foreach_iter(exec_list_iterator, iter, ir->actual_parameters) { ir_variable *sig_param = (ir_variable *)sig_param_iter.get(); ir_instruction *ir = (ir_instruction *)iter.get(); - if (sig_param->mode != ir_var_out && sig_param->mode != ir_var_inout) { + if (sig_param->mode != ir_var_function_out + && sig_param->mode != ir_var_function_inout) { ir->accept(this); } sig_param_iter.next(); -- cgit v1.2.3