Allow iced_wgpu to render to any TextureView

wgpu/src/window/swap_chain.rs

@@ -0,0 +1,49 @@
+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 {
+    pub fn new(
+        device: &wgpu::Device,
+        surface: &wgpu::Surface,
+        width: u32,
+        height: u32,
+        scale_factor: f64,
+    ) -> SwapChain {
+        SwapChain {
+            raw: new_swap_chain(surface, width, height, device),
+            viewport: Viewport::new(width, height, scale_factor),
+        }
+    }
+
+    pub fn next_frame(&mut self) -> (wgpu::SwapChainOutput<'_>, &Viewport) {
+        (self.raw.get_next_texture(), &self.viewport)
+    }
+}
+
+fn new_swap_chain(
+    surface: &wgpu::Surface,
+    width: u32,
+    height: u32,
+    device: &wgpu::Device,
+) -> wgpu::SwapChain {
+    device.create_swap_chain(
+        &surface,
+        &wgpu::SwapChainDescriptor {
+            usage: wgpu::TextureUsage::OUTPUT_ATTACHMENT,
+            format: wgpu::TextureFormat::Bgra8UnormSrgb,
+            width,
+            height,
+            present_mode: wgpu::PresentMode::Vsync,
+        },
+    )
+}