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use Api;
use ContextError;
use CreationError;
use GlAttributes;
use GlRequest;
use GlContext;
use PixelFormat;
use PixelFormatRequirements;
use Robustness;
use WindowAttributes;
use gl_common;
use libc;
use platform;
/// Object that allows you to build headless contexts.
pub struct HeadlessRendererBuilder<'a> {
dimensions: (u32, u32),
pf_reqs: PixelFormatRequirements,
opengl: GlAttributes<&'a platform::HeadlessContext>,
}
impl<'a> HeadlessRendererBuilder<'a> {
/// Initializes a new `HeadlessRendererBuilder` with default values.
pub fn new(width: u32, height: u32) -> HeadlessRendererBuilder<'a> {
HeadlessRendererBuilder {
dimensions: (width, height),
pf_reqs: Default::default(),
opengl: Default::default(),
}
}
/// Sets how the backend should choose the OpenGL API and version.
pub fn with_gl(mut self, request: GlRequest) -> HeadlessRendererBuilder<'a> {
self.opengl.version = request;
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<'a> {
self.opengl.debug = flag;
self
}
/// Sets the robustness of the OpenGL context. See the docs of `Robustness`.
pub fn with_gl_robustness(mut self, robustness: Robustness) -> HeadlessRendererBuilder<'a> {
self.opengl.robustness = robustness;
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> {
platform::HeadlessContext::new(self.dimensions, &self.pf_reqs, &self.opengl)
.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(self) -> Result<HeadlessContext, CreationError> {
self.build()
}
}
/// Represents a headless OpenGL context.
pub struct HeadlessContext {
context: platform::HeadlessContext,
}
impl HeadlessContext {
/// Creates a new OpenGL context
/// Sets the context as the current context.
#[inline]
pub unsafe fn make_current(&self) -> Result<(), ContextError> {
self.context.make_current()
}
/// Returns true if this context is the current one in this thread.
#[inline]
pub fn is_current(&self) -> bool {
self.context.is_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)
}
}
impl GlContext for HeadlessContext {
unsafe fn make_current(&self) -> Result<(), ContextError> {
self.context.make_current()
}
fn is_current(&self) -> bool {
self.context.is_current()
}
fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
self.context.get_proc_address(addr)
}
fn swap_buffers(&self) -> Result<(), ContextError> {
self.context.swap_buffers()
}
fn get_api(&self) -> Api {
self.context.get_api()
}
fn get_pixel_format(&self) -> PixelFormat {
self.context.get_pixel_format()
}
}
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