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Fix parameter naming mismatch and add the filtered debugCallback example #480

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Fix parameter naming mismatch and add the filtered debugCallback example #480

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22 changes: 21 additions & 1 deletion en/03_Drawing_a_triangle/00_Setup/02_Validation_layers.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -285,11 +285,31 @@ some level of severity, for example:

[,c++]
----
if (messageSeverity >= vk::DebugUtilsMessageSeverityFlagBitsEXT::eWarning) {
if (severity >= vk::DebugUtilsMessageSeverityFlagBitsEXT::eWarning) {
// Message is important enough to show
}
----

Applying that to our `debugCallback`, we can filter out anything less severe
than a warning so that verbose and informational messages don't clutter the
output:

[,c++]
----
static VKAPI_ATTR vk::Bool32 VKAPI_CALL debugCallback(vk::DebugUtilsMessageSeverityFlagBitsEXT severity,
vk::DebugUtilsMessageTypeFlagsEXT type,
const vk::DebugUtilsMessengerCallbackDataEXT * pCallbackData,
void * pUserData)
{
if (severity == vk::DebugUtilsMessageSeverityFlagBitsEXT::eWarning ||
severity == vk::DebugUtilsMessageSeverityFlagBitsEXT::eError) {
std::cerr << "validation layer: type " << to_string(type) << " msg: " << pCallbackData->pMessage << std::endl;
}

return vk::False;
}
----

The `messageType` parameter can have the following values:

* `vk::DebugUtilsMessageTypeFlagBitsEXT::eGeneral` : Some event has happened that is unrelated to the specification or performance
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