97 lines
2.8 KiB
Rust
97 lines
2.8 KiB
Rust
//! Glium compatibility module
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use backend::graphics::egl::{EGLGraphicsBackend, SwapBuffersError};
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use glium::Frame;
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use glium::SwapBuffersError as GliumSwapBuffersError;
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use glium::backend::{Backend, Context};
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use glium::debug::DebugCallbackBehavior;
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use std::ops::Deref;
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use std::os::raw::c_void;
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use std::rc::Rc;
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impl From<SwapBuffersError> for GliumSwapBuffersError {
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fn from(error: SwapBuffersError) -> Self {
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match error {
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SwapBuffersError::ContextLost => GliumSwapBuffersError::ContextLost,
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SwapBuffersError::AlreadySwapped => GliumSwapBuffersError::AlreadySwapped,
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}
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}
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}
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/// Wrapper to expose `glium` compatibility
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pub struct GliumGraphicsBackend<T: EGLGraphicsBackend> {
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context: Rc<Context>,
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backend: Rc<InternalBackend<T>>,
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}
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struct InternalBackend<T: EGLGraphicsBackend>(T);
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impl<T: EGLGraphicsBackend + 'static> GliumGraphicsBackend<T> {
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fn new(backend: T) -> GliumGraphicsBackend<T> {
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let internal = Rc::new(InternalBackend(backend));
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GliumGraphicsBackend {
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// cannot fail
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context: unsafe {
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Context::new::<_, ()>(internal.clone(), false, DebugCallbackBehavior::default()).unwrap()
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},
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backend: internal,
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}
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}
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/// Start drawing on the backbuffer.
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///
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/// This function returns a `Frame`, which can be used to draw on it. When the `Frame` is
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/// destroyed, the buffers are swapped.
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///
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/// Note that destroying a `Frame` is immediate, even if vsync is enabled.
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#[inline]
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pub fn draw(&self) -> Frame {
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Frame::new(self.context.clone(),
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self.backend.get_framebuffer_dimensions())
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}
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}
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impl<T: EGLGraphicsBackend> Deref for GliumGraphicsBackend<T> {
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type Target = Context;
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fn deref(&self) -> &Context {
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&self.context
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}
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}
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/// Converter trait to expose `glium` compatibility for all `EGLGraphicsBackend`s
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pub trait IntoGlium: EGLGraphicsBackend + Sized {
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/// Wrap the given `EGLGraphicsBackend` to a `GliumGraphicBackend`
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fn into_glium(self) -> GliumGraphicsBackend<Self>;
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}
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impl<T: EGLGraphicsBackend + 'static> IntoGlium for T {
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fn into_glium(self) -> GliumGraphicsBackend<Self> {
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GliumGraphicsBackend::new(self)
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}
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}
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unsafe impl<T: EGLGraphicsBackend> Backend for InternalBackend<T> {
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fn swap_buffers(&self) -> Result<(), GliumSwapBuffersError> {
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self.0.swap_buffers().map_err(Into::into)
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}
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unsafe fn get_proc_address(&self, symbol: &str) -> *const c_void {
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self.0.get_proc_address(symbol) as *const c_void
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}
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fn get_framebuffer_dimensions(&self) -> (u32, u32) {
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self.0.get_framebuffer_dimensions()
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}
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fn is_current(&self) -> bool {
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self.0.is_current()
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}
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unsafe fn make_current(&self) {
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self.0.make_current().expect("Context was lost")
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}
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}
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