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[glsl-out] Simplify code for writing named expression

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This commit is contained in:
Igor Shaposhnik
2021-06-08 20:21:13 +03:00
committed by Dzmitry Malyshau
parent 575304a50c
commit 4af035edb7
1 changed files with 12 additions and 11 deletions
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23
src/back/glsl/mod.rs
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@@ -1195,22 +1195,23 @@ impl<'a, W: Write> Writer<'a, W> {
// This is where we can generate intermediate constants for some expression types.
Statement::Emit(ref range) => {
for handle in range.clone() {
if let Some(name) = ctx.named_expressions.get(&handle) {
write!(self.out, "{}", INDENT.repeat(indent))?;
let expr_name = if let Some(name) = ctx.named_expressions.get(&handle) {
// Front end provides names for all variables at the start of writing.
// But we write them to step by step. We need to recache them inside `write_named_expr`
// But we write them to step by step. We need to recache them
// Otherwise, we could accidentally write variable name instead of full expression.
// Also, we use sanitized names! It defense backend from generating variable with name from reserved keywords.
let sanitized_name = self.namer.call_unique(name);
self.write_named_expr(handle, sanitized_name, ctx)?;
continue;
}
Some(self.namer.call_unique(name))
} else {
let min_ref_count = ctx.expressions[handle].bake_ref_count();
if min_ref_count <= ctx.info[handle].ref_count {
Some(format!("_expr{}", handle.index()))
} else {
None
}
};
let min_ref_count = ctx.expressions[handle].bake_ref_count();
if min_ref_count <= ctx.info[handle].ref_count {
if let Some(name) = expr_name {
write!(self.out, "{}", INDENT.repeat(indent))?;
let name = format!("_expr{}", handle.index());
self.write_named_expr(handle, name, ctx)?;
}
}