Module gpu 

Real (non-stub) headless GPU rendering for OxiUI, built on wgpu.

This module implements oxiui_core::paint::RenderBackend on a GPU target that is created headlessly — there is no window or swap-chain surface. Draw commands are rasterised into an offscreen colour texture which can be read back to CPU memory for testing or off-screen export.

Sub-modules:

• device — headless Instance/adapter/device/queue + offscreen texture.
• pipeline — solid.wgsl, gradient.wgsl, textured.wgsl, blur.wgsl, and composite.wgsl compiled pipelines.
• buffer — #[repr(C)] Pod vertex / uniform layouts + quad emitters.
• tessellator — CPU path flattening and stroke/fill tessellation.
• texture — image upload utilities and TexturedDraw.
• shadow — ping-pong Gaussian blur + composite for BoxShadow.
• geometry — CPU geometry builder, visibility culling helpers, and draw-segment / gradient-draw data structures.
• exec — GPU pass execution helpers and FrameStats.
• renderer — WgpuBackend and the RenderBackend implementation.
• instance — instanced rectangle rendering pipeline and renderer.
• render_target — off-screen render targets for cached subtrees.
• layer_cache — GPU-backed render-layer cache with dirty tracking.
• ring_buffer — streaming vertex/index ring buffer.

Re-exports

pub use blend::blend_state_for_mode;

pub use blend::BlendPipelineSet;

pub use buffer::Globals;

pub use buffer::GradientVertex;

pub use buffer::TexVertex;

pub use buffer::Vertex;

pub use compute_blur::ComputeBlurPipeline;

pub use device::GpuContext;

pub use device::TARGET_FORMAT;

pub use exec::FrameStats;

pub use frame_pacing::FrameHistogram;

pub use frame_pacing::FrameTimer;

pub use frame_pacing::FrameTimerMode;

pub use frame_pacing::PresentModeRecommendation;

pub use hdr::select_surface_format;

pub use hdr::HdrGpuContext;

pub use hdr::SurfaceColorFormat;

pub use hdr::HDR_FORMAT;

pub use instance::InstanceRect;

pub use instance::InstancedRectPipeline;

pub use instance::InstancedRectRenderer;

pub use layer_cache::LayerCache;

pub use pipeline::BlurPipeline;

pub use pipeline::CompositePipeline;

pub use pipeline::GradientPipeline;

pub use pipeline::SolidPipeline;

pub use pipeline::TexturedPipeline;

pub use render_target::RenderTarget;

pub use renderer::WgpuBackend;

pub use ring_buffer::RingAllocation;

pub use ring_buffer::RingBuffer;

pub use ring_buffer::RingBufferStats;

pub use stencil::StencilClipState;

pub use stencil::StencilTarget;

pub use stencil::StencilWritePipeline;

pub use stencil::DEPTH_STENCIL_FORMAT;

Modules

blend

Blend mode pipeline variants and runtime blend-state selection.

buffer

Vertex / uniform data layouts for the headless solid-fill + gradient pipelines.

compute_blur

Compute-shader Gaussian blur pipeline.

device

Headless wgpu device acquisition and the offscreen colour target.

earcut

Ear-clipping triangulator for the fill tessellation pipeline.

exec

GPU pass execution helpers and per-frame statistics for WgpuBackend.

frame_pacing

GPU frame timing and adaptive present-mode selection.

geometry

CPU-side geometry building for WgpuBackend.

hdr

HDR and wide-gamut surface format selection for the wgpu backend.

instance

Instanced rendering for repeated UI primitives.

layer_cache

Render-layer cache for GPU-backed subtree caching.

pipeline

Render-pipeline construction for the solid-fill / SDF shader and the gradient pipeline.

render_target

Off-screen render targets for cached widget subtrees and compositing.

renderer

WgpuBackend: headless GPU RenderBackend implementing Tier 1 primitives and gradient fills.

ring_buffer

GPU upload ring buffer for streaming vertex/index data.

shadow

Shadow rendering: mask → 2-pass Gaussian blur → composite onto main target.

stencil

Stencil-buffer clipping for non-rectangular clip paths.

tessellator

CPU-side path tessellator for DrawCommand::FillPath and DrawCommand::StrokePath.

texture

Texture upload utilities for the textured pipeline.