Fix/workaround #31987: sample as lamp for environment textures not working

with multi GPU when resolution > 128.

1 files changed, 7 insertions, 1 deletions

diff --git a/intern/cycles/render/light.cpp b/intern/cycles/render/light.cpp
index 6445c04257f..5c1737bd60a 100644
--- a/intern/cycles/render/light.cpp
+++ b/intern/cycles/render/light.cpp
@@ -67,13 +67,19 @@ static void dump_background_pixels(Device *device, DeviceScene *dscene, int res,
 	main_task.shader_x = 0;
 	main_task.shader_w = width*height;
 
+	/* disabled splitting for now, there's an issue with multi-GPU mem_copy_from */
+#if 0
 	list<DeviceTask> split_tasks;
-	main_task.split_max_size(split_tasks, 128*128);
+	main_task.split_max_size(split_tasks, 128*128); 
 
 	foreach(DeviceTask& task, split_tasks) {
 		device->task_add(task);
 		device->task_wait();
 	}
+#else
+	device->task_add(main_task);
+	device->task_wait();
+#endif
 
 	device->mem_copy_from(d_output, 0, 1, d_output.size(), sizeof(float4));
 	device->mem_free(d_input);