Fix a handful of issues:

1. Return RMT_ERROR_NONE instead of NULL from rmt_BindVulkan if Vulkan is not enabled
2. Explicitly cast function pointers to void* in README since this is potentially required by some compilers
3. Use rmtMakeError in rmt_BindVulkan to describe what parameter/function pointer is missing

lib/Remotery.c

@@ -10410,26 +10410,26 @@ RMT_API rmtError _rmt_BindVulkan(void* instance, void* physical_device, void* de
         return RMT_ERROR_REMOTERY_NOT_CREATED;
 
     if (instance == NULL)
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing instance");
 
     if (physical_device == NULL)
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing physical_device");
 
     if (device == NULL)
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing device");
 
     if (queue == NULL)
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing queue");
 
     if (funcs == NULL)
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing funcs");
 
     if (out_bind == NULL)
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing out_bind");
 
  #define CHECK_VK_FUNC(fn)                                               \
     if (funcs->fn == NULL)                                               \
-        return RMT_ERROR_INVALID_INPUT;
+        return rmtMakeError(RMT_ERROR_INVALID_INPUT, "Missing " #fn)
 
     CHECK_VK_FUNC(vkGetPhysicalDeviceProperties);
     CHECK_VK_FUNC(vkQueueSubmit);

lib/Remotery.h

@@ -665,7 +665,7 @@ typedef struct rmtVulkanBind
 
 // Create a Vulkan binding for the given device/queue pair
 #define rmt_BindVulkan(instance, physical_device, device, queue, funcs, out_bind)         \
-    RMT_OPTIONAL_RET(RMT_USE_VULKAN, _rmt_BindVulkan(instance, physical_device, device, queue, funcs, out_bind), NULL)
+    RMT_OPTIONAL_RET(RMT_USE_VULKAN, _rmt_BindVulkan(instance, physical_device, device, queue, funcs, out_bind), RMT_ERROR_NONE)
 
 #define rmt_UnbindVulkan(bind)                                              \
     RMT_OPTIONAL(RMT_USE_VULKAN, _rmt_UnbindVulkan(bind))

readme.md

@@ -227,8 +227,8 @@ must be submitted to the same queue as the samples are issued to. Multiple queue
 Vulkan bind objects.
 
     rmtVulkanFunctions vulkan_funcs;
-    vulkan_funcs.vkGetPhysicalDeviceProperties = my_vulkan_instance_table->vkGetPhysicalDeviceProperties;
-    vulkan_funcs.vkQueueSubmit = my_vulkan_device_table->vkQueueSubmit;
+    vulkan_funcs.vkGetPhysicalDeviceProperties = (void*)my_vulkan_instance_table->vkGetPhysicalDeviceProperties;
+    vulkan_funcs.vkQueueSubmit = (void*)my_vulkan_device_table->vkQueueSubmit;
     // ... All other function pointers
 
     // Parameters are VkInstance, VkPhysicalDevice, VkDevice, VkQueue, rmtVulkanFunctions*, rmtVulkanBind**