Method prepare_frame

src/plot_renderer/shader.rs:544–574

Prepare the renderer for a new frame given the viewport and current plot state. This sets format/viewport/scale, ensures pipelines and grid, and syncs buffers.

(
        &mut self,
        device: &Device,
        queue: &Queue,
        viewport: &Viewport,
        bounds: &Rectangle,
        state: &PlotState,
    )

        // Selection is rebuilt whenever it's active.
        self.rebuild_selection(device, queue, state);

        // Hover/pick highlight mask boxes are baked in clip space, so they must be rebuilt
        // whenever the camera or viewport changes (zoom/pan/resize), not only when the
        // highlighted points change.
        if state.highlight_version != self.versions.highlight || offset_changed {
            self.rebuild_highlight(device, queue, state);
            self.versions.highlight = state.highlight_version;
        }

        // Crosshairs are rebuilt every frame when enabled.
        self.rebuild_crosshairs(device, queue, state);
    }

    /// Prepare the renderer for a new frame given the viewport and current plot state.
    /// This sets format/viewport/scale, ensures pipelines and grid, and syncs buffers.
    pub(crate) fn prepare_frame(
        &mut self,
        device: &Device,
        queue: &Queue,
        viewport: &Viewport,
        bounds: &Rectangle,
        state: &PlotState,
    ) {
        self.bounds = *bounds;
        let scale_factor = viewport.scale_factor();
        let bounds_width = (bounds.width * scale_factor) as u32;
        let bounds_height = (bounds.height * scale_factor) as u32;
        let viewport_size = viewport.physical_size();

        self.set_bounds(bounds_width, bounds_height);
        self.set_scale_factor(scale_factor);
        // In-pass path (MSAA=1, Android) never runs `encode`, so the offscreen
        // MSAA/resolve textures would only waste memory; `encode` self-guards
        // by early-returning when `msaa_targets` is `None`.