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use Api;
use BuilderAttribs;
use CreationError;
use gl_common;
use libc;
use winimpl;
/// Object that allows you to build headless contexts.
pub struct HeadlessRendererBuilder {
attribs: BuilderAttribs<'static>,
}
impl HeadlessRendererBuilder {
/// Initializes a new `HeadlessRendererBuilder` with default values.
pub fn new(width: u32, height: u32) -> HeadlessRendererBuilder {
HeadlessRendererBuilder {
attribs: BuilderAttribs {
headless: true,
dimensions: Some((width, height)),
.. BuilderAttribs::new()
},
}
}
/// Requests to use a specific OpenGL version.
///
/// Version is a (major, minor) pair. For example to request OpenGL 3.3
/// you would pass `(3, 3)`.
pub fn with_gl_version(mut self, version: (u32, u32)) -> HeadlessRendererBuilder {
self.attribs.gl_version = Some(version);
self
}
/// Sets the *debug* flag for the OpenGL context.
///
/// The default value for this flag is `cfg!(ndebug)`, which means that it's enabled
/// when you run `cargo build` and disabled when you run `cargo build --release`.
pub fn with_gl_debug_flag(mut self, flag: bool) -> HeadlessRendererBuilder {
self.attribs.gl_debug = flag;
self
}
/// Builds the headless context.
///
/// Error should be very rare and only occur in case of permission denied, incompatible system,
/// out of memory, etc.
pub fn build(self) -> Result<HeadlessContext, CreationError> {
winimpl::HeadlessContext::new(self.attribs).map(|w| HeadlessContext { context: w })
}
/// Builds the headless context.
///
/// The context is build in a *strict* way. That means that if the backend couldn't give
/// you what you requested, an `Err` will be returned.
pub fn build_strict(mut self) -> Result<HeadlessContext, CreationError> {
self.attribs.strict = true;
self.build()
}
}
/// Represents a headless OpenGL context.
pub struct HeadlessContext {
context: winimpl::HeadlessContext,
}
impl HeadlessContext {
/// Creates a new OpenGL context
/// Sets the context as the current context.
#[inline]
pub unsafe fn make_current(&self) {
self.context.make_current()
}
/// Returns the address of an OpenGL function.
///
/// Contrary to `wglGetProcAddress`, all available OpenGL functions return an address.
#[inline]
pub fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
self.context.get_proc_address(addr) as *const libc::c_void
}
/// Returns the API that is currently provided by this window.
///
/// See `Window::get_api` for more infos.
pub fn get_api(&self) -> Api {
self.context.get_api()
}
pub fn set_window_resize_callback(&mut self, _: Option<fn(u32, u32)>) {
}
}
impl gl_common::GlFunctionsSource for HeadlessContext {
fn get_proc_addr(&self, addr: &str) -> *const libc::c_void {
self.get_proc_address(addr)
}
}
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