Struct FinalBlendPipeline 

pub struct FinalBlendPipeline {
    pipeline: RenderPipeline,
    bind_group_layout: BindGroupLayout,
    sampler: Sampler,
    uniform_buffer: Buffer,
    bind_group: BindGroup,
    fallback_view: TextureView,
    display_texture: Texture,
    display_texture_view: TextureView,
}

Owns the blend pipeline, its bind group, the per-frame uniform buffer, and the display target it writes into. Created once at renderer init and never reallocated; only the bind group is rebuilt when a secondary chain is added or removed.

Fields

pipeline: RenderPipeline

bind_group_layout: BindGroupLayout

sampler: Sampler

uniform_buffer: Buffer

bind_group: BindGroup

fallback_view: TextureView

1×1 fallback bound into the secondary slot when no secondary chain is active. The shader skips it via has_secondary == 0 but wgpu still requires a valid view at every binding.

display_texture: Texture

Display target this pass writes into. The renderer exposes it via render_texture() so existing callers see the post-blend image.

display_texture_view: TextureView

Implementations

impl FinalBlendPipeline

pub fn new( device: &Arc<Device>, config: &RenderConfig, primary_view: &TextureView, ) -> Result<Self>

Build the blend pipeline. primary_view is the initial primary chain’s final_texture_view; the bind group is configured for passthrough (secondary = fallback, progress = 0) at construction.

pub fn display_texture_view(&self) -> &TextureView

The final display texture written by record_pass. Callers expose it as the renderer’s “presentable” output. Borrow the display texture view — needed by overlay passes (text, future HUD) that draw on top of the blended output.

pub fn display_texture(&self) -> &Texture

pub fn set_inputs( &mut self, device: &Arc<Device>, primary_view: &TextureView, secondary_view: Option<&TextureView>, )

Refresh the bind group with the current primary chain’s final_texture_view and, optionally, a secondary chain’s view. Call this whenever either chain’s textures get re-allocated (resize, transition start/end).

pub fn update_progress(&self, queue: &Queue, progress: f32, has_secondary: bool)

Update the eased progress (0 = full secondary, 1 = full primary) and the has_secondary flag in one upload.

pub fn resize(&mut self, device: &Arc<Device>, config: &RenderConfig)

Rebuild the display target at a new resolution. Must be followed by a set_inputs call to rebind the (also-resized) primary view.

pub fn record_pass(&self, encoder: &mut CommandEncoder)

Record the blend pass into the supplied encoder. Output goes to the display texture; caller is responsible for the submit.