From 08550849c7f293f3c49abb0ba5c47c65b68bee0d Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Sat, 4 Jul 2026 01:50:59 +0400
Subject: chore: clarify planning acceptance semantics

---
 crates/fparkan-render/src/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'crates/fparkan-render/src/lib.rs')

diff --git a/crates/fparkan-render/src/lib.rs b/crates/fparkan-render/src/lib.rs
index fa8d3c3..79e5ae5 100644
--- a/crates/fparkan-render/src/lib.rs
+++ b/crates/fparkan-render/src/lib.rs
@@ -389,6 +389,11 @@ pub trait RenderBackend {
     fn execute(&mut self, commands: &RenderCommandList) -> Result<FrameOutput, RenderError>;
 }
 
+/// Marker trait for backends that execute draws against a live GPU.
+///
+/// Planning and capture-only backends must not implement this trait.
+pub trait GpuRenderBackend: RenderBackend {}
+
 /// Backend that validates commands and intentionally produces no pixels.
 #[derive(Clone, Debug, Default)]
 pub struct NullBackend;
-- 
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