Struct RunnerCaps 

pub struct RunnerCaps {
    pub per_sample_shading: bool,
    pub depth_readback: bool,
}

Adapter-derived capabilities the Runner adapts its pipelines to.

Defaults to everything supported — correct for native Vulkan/Metal/DX adapters. Hosts that can land on GL or browser adapters should derive the real values with RunnerCaps::from_adapter and build the runner via Runner::with_caps.

Fields

per_sample_shading: bool

Whether the adapter supports per-sample MSAA shading (DownlevelFlags::MULTISAMPLED_SHADING). When false, every pipeline (stock and later-registered custom) has @interpolate(perspective, sample) rewritten to @interpolate(perspective) before WGSL compilation. The shader then interpolates at pixel centre instead of per MSAA sample — MSAA coverage still works at sample_count > 1; only the per-sub-sample brightness pass is skipped, slightly thickening the AA band on curved SDF edges.

depth_readback: bool

Whether the backend can read a scene depth attachment back for Scene3D label occlusion. Must be false on GL backends (WebGL2): naga’s GLSL target can’t textureLoad depth textures (so building the resolve pipeline panics the device), and GLES 3.0 can’t create multisampled depth textures at all. When false, occlusion still works — the capture re-renders the scene’s meshes with a fragment stage that packs depth into an RGBA8 colour target instead of resolving the depth attachment. Costs one extra mesh-only pass per camera-pose change on those backends.

Implementations

impl RunnerCaps

pub fn from_adapter(adapter: &Adapter) -> Self

Derive the caps from the adapter the host actually got.

GL is treated as unsupported across the board regardless of the reported downlevel flags: Chrome’s SwiftShader WebGL2 fallback reports MULTISAMPLED_SHADING through wgpu, but the GLSL ES target still rejects the sample interpolation qualifier (and can never textureLoad a depth texture). WebGPU/native keep trusting the adapter flags.

Trait Implementations

impl Clone for RunnerCaps

fn clone(&self) -> RunnerCaps

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RunnerCaps

impl Debug for RunnerCaps

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RunnerCaps

fn default() -> Self

Returns the “default value” for a type.