Fix #30246: rendering multiple render layers with CUDA still not working,

should really be fixed now.

intern/cycles/render/session.cpp

@@ -57,6 +57,7 @@ Session::Session(const SessionParams& params_)
 	gpu_draw_ready = false;
 	gpu_need_tonemap = false;
 	pause = false;
+	kernels_loaded = false;
 }
 
 Session::~Session()
@@ -414,6 +415,7 @@ void Session::run_cpu()
 void Session::run()
 {
 	/* load kernels */
+	if(!kernels_loaded) {
 		progress.set_status("Loading render kernels (may take a few minutes the first time)");
 
 		if(!device->load_kernels(params.experimental)) {
@@ -426,6 +428,9 @@ void Session::run()
 			return;
 		}
 
+		kernels_loaded = true;
+	}
+
 	/* session thread loop */
 	progress.set_status("Waiting for render to start");
 

intern/cycles/render/session.h

@@ -156,6 +156,8 @@ protected:
 	thread_condition_variable pause_cond;
 	thread_mutex pause_mutex;
 
+	bool kernels_loaded;
+
 	double start_time;
 	double reset_time;
 	double preview_time;