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use super::WgpuRenderer;
use crate::{FrameResources, RenderResources, RendererResult};
impl WgpuRenderer {
/// Called every frame to prepare for rendering
///
/// This corresponds to ImGui_ImplWGPU_NewFrame in the C++ implementation
pub fn new_frame(&mut self) -> RendererResult<()> {
let needs_recreation = if let Some(backend_data) = &self.backend_data {
backend_data.pipeline_state.is_none()
} else {
false
};
if needs_recreation {
// Extract the backend data temporarily to avoid borrow checker issues
let mut backend_data = self.backend_data.take().unwrap();
self.create_device_objects(&mut backend_data)?;
self.backend_data = Some(backend_data);
}
Ok(())
}
/// Invalidate device objects
///
/// This corresponds to ImGui_ImplWGPU_InvalidateDeviceObjects in the C++ implementation
pub fn invalidate_device_objects(&mut self) -> RendererResult<()> {
if let Some(ref mut backend_data) = self.backend_data {
backend_data.pipeline_state = None;
backend_data.render_resources = RenderResources::new();
// Clear frame resources
for frame_resources in &mut backend_data.frame_resources {
*frame_resources = FrameResources::new();
}
}
// Clear texture manager
self.texture_manager.clear();
self.default_texture = None;
Ok(())
}
/// Shutdown the renderer
///
/// This corresponds to ImGui_ImplWGPU_Shutdown in the C++ implementation.
///
/// If multi-viewport support was enabled, this also makes renderer callbacks no-op for this
/// renderer. Call the matching multi-viewport shutdown helper when you also need to uninstall
/// callbacks from the ImGui context and destroy platform windows.
pub fn shutdown(&mut self) {
#[cfg(any(feature = "multi-viewport-winit", feature = "multi-viewport-sdl3"))]
self.clear_multi_viewport_renderer_state();
self.invalidate_device_objects().ok();
self.backend_data = None;
}
#[cfg(any(feature = "multi-viewport-winit", feature = "multi-viewport-sdl3"))]
pub(super) fn clear_multi_viewport_renderer_state(&mut self) {
// Make any installed multi-viewport callbacks become a no-op if the renderer is
// shut down or dropped without an explicit disable/shutdown call.
#[cfg(feature = "multi-viewport-winit")]
{
super::multi_viewport::clear_for_drop(self as *mut WgpuRenderer);
}
#[cfg(feature = "multi-viewport-sdl3")]
{
super::multi_viewport_sdl3::clear_for_drop(self as *mut WgpuRenderer);
}
}
}