check errors in Canvas:send/recv, disable with fail_silently

2 files changed, 10 insertions, 6 deletions

diff --git a/README.md b/README.md
index 9ab89ea..48139d3 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,6 @@ This wraps the OpenGL C API of [texture-share-vk](https://github.com/DigitOtter/
 - `Client:loadSharedCanvas(name)`: loads a `SharedCanvas` object from another publisher.
 - `Canvas.name`: the name passed in the SharedCanvas constructor
 - `Canvas.canvas`: the love2d `Canvas` object
-- `Canvas:send()`: Sends the current contents of the Canvas to subscribers, call this after drawing to the Canvas.
-- `Canvas:load()`: Loads updated contents from the publisher, call this before drawing the Canvas.
+- `Canvas:send([fail_silently])`: Sends the current contents of the Canvas to subscribers, call this after drawing to the Canvas.
+- `Canvas:load([fail_silently])`: Loads updated contents from the publisher, call this before drawing the Canvas.
 - `Canvas:any_other_method()`: delegated to the love2d `Canvas` object
diff --git a/texture-share-vk.lua b/texture-share-vk.lua
index f8f9c4c..3ec1250 100644
--- a/texture-share-vk.lua
+++ b/texture-share-vk.lua
@@ -209,8 +209,8 @@ function Client:__gc()
   tvs.gl_client_destroy(self)
 end
 
-function Canvas:send()
-  return tvs.gl_client_send_image(
+function Canvas:send(fail_silently)
+  local status = tvs.gl_client_send_image(
     self.client.client,
     self.name,
     self.texture_id,
@@ -219,10 +219,12 @@ function Canvas:send()
     0,
     nil
   )
+  assert(status >= 0, "error sending image")
+  assert(fail_silently or (status == 1), "send: image not found")
 end
 
-function Canvas:recv()
-  return tvs.gl_client_recv_image(
+function Canvas:recv(fail_silently)
+  local status = tvs.gl_client_recv_image(
     self.client.client,
     self.name,
     self.texture_id,
@@ -231,6 +233,8 @@ function Canvas:recv()
     0,
     nil
   )
+  assert(status >= 0, "error receiving image")
+  assert(fail_silently or (status == 1), "recv: image not found")
 end
 
 function Canvas:__index(key)