Struct MotionVectorRenderer 

pub struct MotionVectorRenderer {
    pipeline: RenderPipeline,
    vertex_buffer: Buffer,
    vertex_count: u32,
}

GPU pass for the MD2 motion-vector grid.

Fields

pipeline: RenderPipeline

vertex_buffer: Buffer

vertex_count: u32

Logical vertex count after the most recent Self::update. Always segments * 2.

Implementations

impl MotionVectorRenderer

pub fn new(device: &Device, format: TextureFormat) -> Self

pub fn update( &mut self, queue: &Queue, params: MotionVectorParams, warp_field: Option<WarpField<'_>>, ) -> u32

Rebuild the per-frame segment stream from a MotionVectorParams snapshot and upload it. Returns the number of segments produced — 0 when the pass is a no-op (zero alpha, zero grid, etc).

warp_field (when Some) carries the per-vertex uv_warp array from the warp mesh; the segment at grid cell (i, j) then points along the local warp displacement (uv_warp - uv_orig) instead of a flat horizontal stub. Matches MD2’s “streaks” feel: the segments anticipate the trail the feedback loop will pull them into. Pass None to fall back to the horizontal-stub default.

pub fn render(&self, encoder: &mut CommandEncoder, view: &TextureView)

pub fn segment_count(&self) -> u32

Number of segments the next Self::render will issue (two vertices each). Exposed for tests.