Fix buffer updates going to the wrong cmd buffer if barriers were 0

From what I could see only SSAO & SSIL were affected when they both
call:

int zero[1] = { 0 };
RD::get_singleton()->buffer_update(ssao.importance_map_load_counter, 0,
sizeof(uint32_t), &zero, 0);

int zero[1] = { 0 };
RD::get_singleton()->buffer_update(ssil.importance_map_load_counter, 0,
sizeof(uint32_t), &zero, 0);

Also documented what setup_command_buffer & draw_command_buffer are for.

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/vulkan/rendering_device_vulkan.cpp b/drivers/vulkan/rendering_device_vulkan.cpp
index a9f77c9072..a54e5a8059 100644
--- a/drivers/vulkan/rendering_device_vulkan.cpp
+++ b/drivers/vulkan/rendering_device_vulkan.cpp
@@ -5995,7 +5995,7 @@ Error RenderingDeviceVulkan::buffer_update(RID p_buffer, uint32_t p_offset, uint
 	// No barrier should be needed here.
 	// _buffer_memory_barrier(buffer->buffer, p_offset, p_size, dst_stage_mask, VK_PIPELINE_STAGE_TRANSFER_BIT, dst_access, VK_ACCESS_TRANSFER_WRITE_BIT, true);
 
-	Error err = _buffer_update(buffer, p_offset, (uint8_t *)p_data, p_size, p_post_barrier);
+	Error err = _buffer_update(buffer, p_offset, (uint8_t *)p_data, p_size, true);
 	if (err) {
 		return err;
 	}