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use crate::Viewport;
/// The rendering target of a window.
///
/// It represents a series of virtual framebuffers with a scale factor.
#[derive(Debug)]
pub struct SwapChain {
raw: wgpu::SwapChain,
viewport: Viewport,
}
impl SwapChain {}
impl SwapChain {
/// Creates a new [`SwapChain`] for the given surface.
///
/// [`SwapChain`]: struct.SwapChain.html
pub fn new(
device: &wgpu::Device,
surface: &wgpu::Surface,
format: wgpu::TextureFormat,
width: u32,
height: u32,
) -> SwapChain {
SwapChain {
raw: new_swap_chain(surface, format, width, height, device),
viewport: Viewport::new(width, height),
}
}
/// Returns the next frame of the [`SwapChain`] alongside its [`Viewport`].
///
/// [`SwapChain`]: struct.SwapChain.html
/// [`Viewport`]: ../struct.Viewport.html
pub fn next_frame(
&mut self,
) -> Result<(wgpu::SwapChainOutput, &Viewport), wgpu::TimeOut> {
let viewport = &self.viewport;
self.raw.get_next_texture().map(|output| (output, viewport))
}
}
fn new_swap_chain(
surface: &wgpu::Surface,
format: wgpu::TextureFormat,
width: u32,
height: u32,
device: &wgpu::Device,
) -> wgpu::SwapChain {
device.create_swap_chain(
&surface,
&wgpu::SwapChainDescriptor {
usage: wgpu::TextureUsage::OUTPUT_ATTACHMENT,
format,
width,
height,
present_mode: wgpu::PresentMode::Mailbox,
},
)
}
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