provided options are now checked against the available options

rendernode.py

@@ -148,7 +148,9 @@ class RenderNode(object):
             pool = FakePool()
             pool_initializer(self)
         else:
+            pool_initializer(self)
             pool = multiprocessing.Pool(processes=procs,initializer=pool_initializer,initargs=(self,))
+            
             #warm up the pool so it reports all the worker id's
             if logging.getLogger().level >= 10:
                 pool.map(bool,xrange(multiprocessing.cpu_count()),1)

src/iterate.c

@@ -26,11 +26,10 @@ static PyObject *transparent_blocks = NULL;
 
 PyObject *init_chunk_render(PyObject *self, PyObject *args) {
    
-    /* this function only needs to be called once, anything more is an
-     * error... */
+    /* this function only needs to be called once, anything more should be
+     * ignored */
     if (blockmap) {
-        PyErr_SetString(PyExc_RuntimeError, "init_chunk_render should only be called once per process.");
-        return NULL;
+        Py_RETURN_NONE;
     }
 
     textures = PyImport_ImportModule("textures");

src/rendermodes.c

@@ -301,14 +301,56 @@ PyObject *get_render_mode_options(PyObject *self, PyObject *args)
     return options;
 }
 
+/* helper to decide if a rendermode supports a given option */
+static inline int
+render_mode_supports_option(RenderModeInterface *iface, const char *name) {
+    unsigned int i;
+    
+    if (iface->options != NULL) {
+        for (i = 0; iface->options[i].name != NULL; i++) {
+            if (strcmp(iface->options[i].name, name) == 0) {
+                return 1;
+            }
+        }
+    }
+    
+    if (iface->parent != NULL)
+        return render_mode_supports_option(iface->parent, name);
+    
+    return 0;
+}
+
 /* python rendermode options bindings */
 PyObject *set_render_mode_options(PyObject *self, PyObject *args) {
     const char *rendermode;
-    PyObject *opts;
+    PyObject *opts, *key, *value;
+    Py_ssize_t pos = 0;
+    RenderModeInterface *iface = NULL;
+    unsigned int i;
     if (!PyArg_ParseTuple(args, "sO!", &rendermode, &PyDict_Type, &opts))
         return NULL;
     
-    /* check options here */
+    for (i = 0; render_modes[i] != NULL; i++) {
+        if (strcmp(render_modes[i]->name, rendermode) == 0) {
+            iface = render_modes[i];
+            break;
+        }
+    }
+    
+    if (iface == NULL) {
+        return PyErr_Format(PyExc_ValueError, "'%s' is not a valid rendermode name", rendermode);
+    }
+    
+    /* check options to make sure they're available */
+    while (PyDict_Next(opts, &pos, &key, &value)) {
+        const char *name = PyString_AsString(key);
+        if (name == NULL)
+            return NULL;
+        
+        if (!render_mode_supports_option(iface, name)) {
+            return PyErr_Format(PyExc_ValueError, "'%s' is not a valid option for rendermode '%s'", name, rendermode);
+        }
+    }
     
     if (render_mode_options == NULL)
         render_mode_options = PyDict_New();