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debug.rs
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debug.rs
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/*!
*/
use backend::Facade;
use context::Context;
use ContextExt;
use version::Api;
use version::Version;
use gl;
use std::rc::Rc;
use std::mem;
pub use context::DebugCallbackBehavior;
/// Represents a callback that can be used for the debug output feature of OpenGL.
///
/// The first three parameters are self-explanatory. The fourth parameter is an identifier for this
/// message whose meaning is implementation-defined. The fifth parameter indicates whether glium
/// is already handling any possible error condition, so you don't need to print an error. The last
/// parameter is a message generated by the OpenGL implementation.
pub type DebugCallback = Box<FnMut(Source, MessageType, Severity, u32, bool, &str)>;
/// Severity of a debug message.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
#[repr(u32)]
pub enum Severity {
/// Anything that isn't an error or performance issue.
Notification = gl::DEBUG_SEVERITY_NOTIFICATION,
/// Redundant state-change performance warning, or unimportant undefined behavior.
Low = gl::DEBUG_SEVERITY_LOW,
/// Major performance warnings, shader compilation/linking warnings,
/// or the use of deprecated functionality.
Medium = gl::DEBUG_SEVERITY_MEDIUM,
/// All OpenGL Errors, shader compilation/linking errors,
/// or highly-dangerous undefined behavior.
High = gl::DEBUG_SEVERITY_HIGH,
}
/// Source of a debug message.
#[derive(Clone, Copy, Debug)]
#[repr(u32)]
pub enum Source {
/// Calls to the OpenGL API.
Api = gl::DEBUG_SOURCE_API,
/// Calls to a window-system API.
WindowSystem = gl::DEBUG_SOURCE_WINDOW_SYSTEM,
/// A compiler for a shading language.
ShaderCompiler = gl::DEBUG_SOURCE_SHADER_COMPILER,
/// An application associated with Openctxt.gl.
ThirdParty = gl::DEBUG_SOURCE_THIRD_PARTY,
/// Explicitly generated by Glium or the application.
///
/// This should never happen, but is included here for completeness.
Application = gl::DEBUG_SOURCE_APPLICATION,
///
OtherSource = gl::DEBUG_SOURCE_OTHER,
}
/// Type of a debug message.
#[derive(Clone, Copy, Debug)]
#[repr(u32)]
pub enum MessageType {
/// An error, typically from the API
Error = gl::DEBUG_TYPE_ERROR,
/// Some behavior marked deprecated has been used
DeprecatedBehavior = gl::DEBUG_TYPE_DEPRECATED_BEHAVIOR,
/// Something has invoked undefined behavior
UndefinedBehavior = gl::DEBUG_TYPE_UNDEFINED_BEHAVIOR,
/// Some functionality the user relies upon is not portable
Portability = gl::DEBUG_TYPE_PORTABILITY,
/// Code has triggered possible performance issues
Performance = gl::DEBUG_TYPE_PERFORMANCE,
/// Command stream annotation
Marker = gl::DEBUG_TYPE_MARKER,
/// Entering a debug group
PushGroup = gl::DEBUG_TYPE_PUSH_GROUP,
/// Leaving a debug group
PopGroup = gl::DEBUG_TYPE_POP_GROUP,
/// Any other event
Other = gl::DEBUG_TYPE_OTHER,
}
/// Allows you to obtain the timestamp inside the OpenGL commands queue.
///
/// When you call functions in glium, they are not instantly executed. Instead they are
/// added in a commands queue that the backend executes asynchronously.
///
/// When you call `TimestampQuery::new`, a command is added to this list asking the
/// backend to send us the current timestamp. Thanks to this, you can know how much time
/// it takes to execute commands.
///
/// ## Example
///
/// ```no_run
/// # let display: glium::Display = unsafe { std::mem::uninitialized() };
/// let before = glium::debug::TimestampQuery::new(&display);
/// // do some stuff here
/// let after = glium::debug::TimestampQuery::new(&display);
///
/// match (after, before) {
/// (Some(after), Some(before)) => {
/// let elapsed = after.get() - before.get();
/// println!("Time it took to do stuff: {}", elapsed);
/// },
/// _ => ()
/// }
/// ```
///
pub struct TimestampQuery {
context: Rc<Context>,
id: gl::types::GLuint,
}
impl TimestampQuery {
/// Creates a new `TimestampQuery`. Returns `None` if the backend doesn't support it.
pub fn new<F: ?Sized>(facade: &F) -> Option<TimestampQuery> where F: Facade {
let ctxt = facade.get_context().make_current();
let id = if ctxt.version >= &Version(Api::Gl, 3, 2) { // TODO: extension
unsafe {
let mut id = mem::uninitialized();
ctxt.gl.GenQueries(1, &mut id);
ctxt.gl.QueryCounter(id, gl::TIMESTAMP);
Some(id)
}
} else if ctxt.extensions.gl_ext_disjoint_timer_query {
unsafe {
let mut id = mem::uninitialized();
ctxt.gl.GenQueriesEXT(1, &mut id);
ctxt.gl.QueryCounterEXT(id, gl::TIMESTAMP);
Some(id)
}
} else {
None
};
id.map(|q| TimestampQuery {
context: facade.get_context().clone(),
id: q
})
}
/// Queries the counter to see if the timestamp is already available.
///
/// It takes some time to retreive the value, during which you can execute other
/// functions.
pub fn is_ready(&self) -> bool {
use std::mem;
let ctxt = self.context.make_current();
if ctxt.version >= &Version(Api::Gl, 3, 2) { // TODO: extension
unsafe {
let mut value = mem::uninitialized();
ctxt.gl.GetQueryObjectiv(self.id, gl::QUERY_RESULT_AVAILABLE, &mut value);
value != 0
}
} else if ctxt.extensions.gl_ext_disjoint_timer_query {
unsafe {
let mut value = mem::uninitialized();
ctxt.gl.GetQueryObjectivEXT(self.id, gl::QUERY_RESULT_AVAILABLE_EXT, &mut value);
value != 0
}
} else {
unreachable!();
}
}
/// Returns the value of the timestamp. Blocks until it is available.
///
/// This function doesn't block if `is_ready` returns true.
pub fn get(self) -> u64 {
use std::mem;
let ctxt = self.context.make_current();
if ctxt.version >= &Version(Api::Gl, 3, 2) { // TODO: extension
unsafe {
let mut value = mem::uninitialized();
ctxt.gl.GetQueryObjectui64v(self.id, gl::QUERY_RESULT, &mut value);
ctxt.gl.DeleteQueries(1, [self.id].as_ptr());
value
}
} else if ctxt.extensions.gl_ext_disjoint_timer_query {
unsafe {
let mut value = mem::uninitialized();
ctxt.gl.GetQueryObjectui64vEXT(self.id, gl::QUERY_RESULT_EXT, &mut value);
ctxt.gl.DeleteQueriesEXT(1, [self.id].as_ptr());
value
}
} else {
unreachable!();
}
}
}