dear-imgui-wgpu 0.21.0

WGPU renderer backend for dear-imgui-rs (native + WebAssembly)
Documentation 
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use super::resource::ManagedWgpuTexture;
use super::*;

#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub(crate) enum ManagedRequestOutcome {
    Uploaded(TextureId),
    Destroyed,
    Superseded,
}

impl WgpuTextureManager {
    pub(crate) fn handle_texture_requests(
        &mut self,
        requests: &[TextureRequest],
        request_epoch: u64,
        device: &Device,
        queue: &Queue,
        render_resources: &mut RenderResources,
    ) -> RendererResult<Vec<TextureFeedback>> {
        let mut feedback = Vec::with_capacity(requests.len());
        for request in requests {
            match self.apply_managed_request_at_epoch(
                request.texture(),
                request.operation(),
                request_epoch,
                device,
                queue,
                render_resources,
            )? {
                ManagedRequestOutcome::Uploaded(texture_id) => {
                    feedback.push(request.uploaded(texture_id)?);
                }
                ManagedRequestOutcome::Destroyed => feedback.push(request.destroyed()?),
                ManagedRequestOutcome::Superseded => feedback.push(request.superseded()),
            }
        }
        Ok(feedback)
    }

    pub(crate) fn apply_managed_request_at_epoch(
        &mut self,
        id: SnapshotTextureId,
        operation: &TextureOp,
        request_epoch: u64,
        device: &Device,
        queue: &Queue,
        render_resources: &mut RenderResources,
    ) -> RendererResult<ManagedRequestOutcome> {
        match operation {
            TextureOp::Create {
                format,
                width,
                height,
                row_pitch,
                pixels,
            } => {
                if self.destroyed_managed_textures.contains_key(&id) {
                    // A delayed create must not resurrect a resource after its destroy request.
                    return Ok(ManagedRequestOutcome::Superseded);
                }
                if let Some(existing) = self.managed_textures.get(&id)
                    && (existing.width != *width || existing.height != *height)
                {
                    return Err(RendererError::ManagedTextureLayoutMismatch {
                        texture: id,
                        expected: [existing.width, existing.height],
                        actual: [*width, *height],
                    });
                }
                let (resource, rgba_pixels) = Self::create_managed_texture_resource(
                    device, queue, *format, *width, *height, *row_pitch, pixels,
                )?;
                let texture_id = if let Some(existing) = self.managed_textures.get_mut(&id) {
                    existing.resource = resource;
                    existing.rgba_pixels = rgba_pixels;
                    existing.texture_id
                } else {
                    let texture_id = self.allocate_managed_texture_id()?;
                    self.managed_textures.insert(
                        id,
                        ManagedWgpuTexture {
                            texture_id,
                            width: *width,
                            height: *height,
                            resource,
                            rgba_pixels,
                        },
                    );
                    self.managed_by_texture_id.insert(texture_id, id);
                    texture_id
                };
                render_resources.remove_image_bind_group(texture_id);
                Ok(ManagedRequestOutcome::Uploaded(texture_id))
            }
            TextureOp::Update {
                format,
                width,
                height,
                rects,
            } => {
                if self.destroyed_managed_textures.contains_key(&id) {
                    return Ok(ManagedRequestOutcome::Superseded);
                }
                self.update_managed_texture(device, queue, id, *format, [*width, *height], rects)?;
                let texture_id = self
                    .managed_texture_id(id)
                    .ok_or(RendererError::ManagedTextureMissing(id))?;
                render_resources.remove_image_bind_group(texture_id);
                Ok(ManagedRequestOutcome::Uploaded(texture_id))
            }
            TextureOp::Destroy => {
                self.destroyed_managed_textures
                    .entry(id)
                    .and_modify(|destroy_epoch| {
                        *destroy_epoch = (*destroy_epoch).max(request_epoch);
                    })
                    .or_insert(request_epoch);
                if let Some(entry) = self.managed_textures.remove(&id) {
                    self.managed_by_texture_id.remove(&entry.texture_id);
                    render_resources.remove_image_bind_group(entry.texture_id);
                }
                // Repeated destroy requests are intentionally acknowledged even after the GPU
                // resource is gone. The Context may be retrying feedback from an abandoned epoch.
                Ok(ManagedRequestOutcome::Destroyed)
            }
        }
    }

    #[cfg(test)]
    pub(super) fn apply_managed_request(
        &mut self,
        id: SnapshotTextureId,
        operation: &TextureOp,
        device: &Device,
        queue: &Queue,
        render_resources: &mut RenderResources,
    ) -> RendererResult<ManagedRequestOutcome> {
        self.apply_managed_request_at_epoch(id, operation, 0, device, queue, render_resources)
    }
}