bherbruckandClaude Opus 5.5
bd8e8c4809
Fixes #34 The surface-analysis curvature map took screen-space derivatives (dpdx/dpdy) inside a branch of fs_solid. naga accepts that, but browsers' WGSL compiler (Tint, WebGPU) requires derivatives in uniform control flow and rejects the whole `sc_viewport` shader module, so every viewport pipeline was invalid and the viewport stayed black as soon as a design was shown. The curvature is now worked out first thing in fs_solid and passed in, and the canvas image shader samples its texture before discarding. Regression test: every fragment entry point makes derivative and implicit-LOD sampling calls (directly or through helpers) before any branch or return. Checked in headless Chromium with WebGPU (SwiftShader): before, "dpdx must only be called from uniform control flow" and invalid pipelines on New Design; after, no shader or pipeline errors. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1044 lines
43 KiB
Rust
1044 lines
43 KiB
Rust
//! GPU viewport: shaded triangles and screen-space wide lines with a depth buffer, drawn in an
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//! `egui_wgpu` paint callback. Geometry is uploaded when the scene changes; each frame only the
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//! camera uniform changes.
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use std::sync::{Arc, Mutex};
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use egui_wgpu::wgpu;
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use egui_wgpu::wgpu::util::DeviceExt;
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/// Triangle vertex: position (3 × f32), normal (3 × f32), sRGB colour (4 × u8).
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pub const TRI_SIZE: usize = 28;
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/// Line instance: a, b (3 × f32 each), colour (4 × u8), width in pixels (f32).
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pub const LINE_SIZE: usize = 32;
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const UNIFORM_SIZE: u64 = 192;
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/// CPU-side geometry waiting to be uploaded. The model scene changes with the design; the
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/// highlight scene (hover, selection, the origin widget) changes often and is small.
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#[derive(Default, Clone)]
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pub struct GpuScene {
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/// Opaque triangles. A zero normal draws the colour flat (unlit).
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pub tris: Vec<u8>,
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/// Translucent triangles (alpha from the colour), drawn after the opaque ones without
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/// writing depth.
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pub trans: Vec<u8>,
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/// See-through bodies and faces (appearance opacity below 1), closed and outward-wound:
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/// their far sides are drawn first, then their near sides, so they read like glass.
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pub glass: Vec<u8>,
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/// Depth-tested lines.
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pub lines: Vec<u8>,
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/// Lines drawn only where the model hides them (hidden edges).
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pub hidden: Vec<u8>,
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/// Lines drawn over everything (active sketch, highlights).
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pub overlay: Vec<u8>,
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/// Translucent triangles pushed slightly back in depth, so they only show where nothing
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/// coincides with them (removed material in a preview).
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pub ghost: Vec<u8>,
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/// Translucent triangles drawn through everything (a cut's tool body).
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pub xray: Vec<u8>,
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/// Lines drawn first, under everything (the ground grid: the model hides it, it never
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/// hides the model).
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pub under: Vec<u8>,
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}
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impl GpuScene {
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pub fn tri(&mut self, p: [f32; 3], n: [f32; 3], c: [u8; 4]) {
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for v in p.iter().chain(&n) {
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self.tris.extend_from_slice(&v.to_le_bytes());
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}
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self.tris.extend_from_slice(&c);
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}
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pub fn trans_tri(&mut self, p: [f32; 3], n: [f32; 3], c: [u8; 4]) {
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for v in p.iter().chain(&n) {
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self.trans.extend_from_slice(&v.to_le_bytes());
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}
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self.trans.extend_from_slice(&c);
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}
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/// A line shown only where the model hides it.
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pub fn hidden_line(&mut self, a: [f32; 3], b: [f32; 3], c: [u8; 4], width: f32) {
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for v in a.iter().chain(&b) {
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self.hidden.extend_from_slice(&v.to_le_bytes());
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}
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self.hidden.extend_from_slice(&c);
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self.hidden.extend_from_slice(&width.to_le_bytes());
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}
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pub fn glass_tri(&mut self, p: [f32; 3], n: [f32; 3], c: [u8; 4]) {
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for v in p.iter().chain(&n) {
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self.glass.extend_from_slice(&v.to_le_bytes());
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}
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self.glass.extend_from_slice(&c);
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}
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pub fn ghost_tri(&mut self, p: [f32; 3], n: [f32; 3], c: [u8; 4]) {
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for v in p.iter().chain(&n) {
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self.ghost.extend_from_slice(&v.to_le_bytes());
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}
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self.ghost.extend_from_slice(&c);
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}
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pub fn xray_tri(&mut self, p: [f32; 3], n: [f32; 3], c: [u8; 4]) {
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for v in p.iter().chain(&n) {
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self.xray.extend_from_slice(&v.to_le_bytes());
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}
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self.xray.extend_from_slice(&c);
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}
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/// A line under everything (see [`GpuScene::under`]).
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pub fn under_line(&mut self, a: [f32; 3], b: [f32; 3], c: [u8; 4], width: f32) {
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for v in a.iter().chain(&b) {
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self.under.extend_from_slice(&v.to_le_bytes());
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}
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self.under.extend_from_slice(&c);
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self.under.extend_from_slice(&width.to_le_bytes());
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}
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pub fn line(&mut self, a: [f32; 3], b: [f32; 3], c: [u8; 4], width: f32, on_top: bool) {
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let out = if on_top { &mut self.overlay } else { &mut self.lines };
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for v in a.iter().chain(&b) {
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out.extend_from_slice(&v.to_le_bytes());
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}
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out.extend_from_slice(&c);
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out.extend_from_slice(&width.to_le_bytes());
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}
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}
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pub type SceneSlot = Arc<Mutex<Option<GpuScene>>>;
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/// A reference image (canvas or decal): a textured quad, depth-tested against the model.
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#[derive(Clone)]
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pub struct GpuImage {
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pub id: u64,
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/// Changes when the pixels change (the texture is re-uploaded).
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pub version: u64,
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pub size: [u32; 2],
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/// Straight RGBA8, `size[0] * size[1] * 4` bytes.
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pub rgba: Arc<Vec<u8>>,
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/// Bottom-left, bottom-right, top-right, top-left of the image.
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pub corners: [[f32; 3]; 4],
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pub opacity: f32,
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}
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/// Image vertex: position (3 × f32), uv (2 × f32), opacity (f32).
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const IMG_SIZE: usize = 24;
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/// Per-frame parameters.
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pub struct ViewportCallback {
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pub key: u64,
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pub slot: SceneSlot,
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/// The highlight scene and its key.
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pub hl_key: u64,
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pub hl_slot: SceneSlot,
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/// The live preview scene and its key.
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pub pv_key: u64,
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pub pv_slot: SceneSlot,
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/// Column-major view-projection.
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pub view_proj: [[f32; 4]; 4],
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/// Direction toward the eye (for lighting).
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pub back: [f32; 3],
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/// Viewport size in physical pixels.
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pub size_px: [f32; 2],
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/// Section cut: (normal, d); fragments with normal·p > d are hidden. A zero normal: none.
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pub clip: [f32; 4],
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/// Colour of the inside of cut bodies (straight sRGBA, 0..1).
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pub cap: [f32; 4],
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/// Canvases and decals.
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pub images: Vec<GpuImage>,
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/// Surface analysis: (mode: 0 none, 1 zebra, 2 draft, 3 curvature, 4 environment,
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/// 5 accessibility; parameter; scale; size) and the pull / access direction.
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pub analysis: [f32; 8],
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/// Accessibility: the depth map seen from the access direction.
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pub access: Option<AccessMap>,
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/// Draw silhouette outlines around the model (visual styles with edges).
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pub outline: bool,
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}
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/// Heights of the model seen from a direction (an orthographic depth map): a point is reachable
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/// from that direction when nothing lies above it.
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#[derive(Clone)]
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pub struct AccessMap {
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pub version: u64,
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pub size: u32,
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/// Row-major heights along the direction (−∞ where nothing is).
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pub depth: Arc<Vec<f32>>,
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/// Map axes: pixel = (p·u + u.w, p·v + v.w) × scale.
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pub u: [f32; 4],
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pub v: [f32; 4],
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pub scale: f32,
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}
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struct Batch {
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buffer: wgpu::Buffer,
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count: u32,
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}
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#[derive(Default)]
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struct Batches {
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key: Option<u64>,
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tris: Option<Batch>,
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trans: Option<Batch>,
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glass: Option<Batch>,
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lines: Option<Batch>,
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hidden: Option<Batch>,
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overlays: Option<Batch>,
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ghost: Option<Batch>,
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xray: Option<Batch>,
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under: Option<Batch>,
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}
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impl Batches {
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fn take(&mut self, device: &wgpu::Device, key: u64, slot: &SceneSlot) {
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if self.key == Some(key) {
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return;
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}
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if let Some(sc) = slot.lock().ok().and_then(|mut s| s.take()) {
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self.tris = upload(device, "sc_tris", &sc.tris, TRI_SIZE);
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self.trans = upload(device, "sc_trans", &sc.trans, TRI_SIZE);
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self.glass = upload(device, "sc_glass", &sc.glass, TRI_SIZE);
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self.lines = upload(device, "sc_lines", &sc.lines, LINE_SIZE);
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self.hidden = upload(device, "sc_hidden", &sc.hidden, LINE_SIZE);
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self.overlays = upload(device, "sc_overlay", &sc.overlay, LINE_SIZE);
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self.ghost = upload(device, "sc_ghost", &sc.ghost, TRI_SIZE);
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self.xray = upload(device, "sc_xray", &sc.xray, TRI_SIZE);
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self.under = upload(device, "sc_under", &sc.under, LINE_SIZE);
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self.key = Some(key);
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}
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}
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}
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struct Resources {
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tri: wgpu::RenderPipeline,
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/// Highlight triangles over the model (depth test ≤, no depth write).
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tri_hl: wgpu::RenderPipeline,
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trans: wgpu::RenderPipeline,
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/// Glass: far sides (front faces culled), then near sides (back faces culled).
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glass_far: wgpu::RenderPipeline,
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glass_near: wgpu::RenderPipeline,
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ghost: wgpu::RenderPipeline,
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xray: wgpu::RenderPipeline,
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line: wgpu::RenderPipeline,
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/// Lines behind the model (depth test >).
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line_hidden: wgpu::RenderPipeline,
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/// Silhouettes: back faces pushed out a little on screen, drawn dark behind the model.
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outline: wgpu::RenderPipeline,
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overlay: wgpu::RenderPipeline,
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uniform: wgpu::Buffer,
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bind: wgpu::BindGroup,
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linear_out: bool,
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model: Batches,
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highlight: Batches,
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preview: Batches,
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image: wgpu::RenderPipeline,
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image_bgl: wgpu::BindGroupLayout,
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sampler: wgpu::Sampler,
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/// Textures by image id: (version, bind group).
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textures: std::collections::HashMap<u64, (u64, wgpu::BindGroup)>,
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/// This frame's quads: (image id, vertices).
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quads: Vec<(u64, Batch)>,
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access_bgl: wgpu::BindGroupLayout,
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/// The accessibility depth map (a 1 × 1 stand-in when there is none) and its version.
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access_bind: wgpu::BindGroup,
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access_version: u64,
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}
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fn access_texture(device: &wgpu::Device, queue: Option<&wgpu::Queue>, bgl: &wgpu::BindGroupLayout, size: u32, depth: &[f32]) -> wgpu::BindGroup {
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let extent = wgpu::Extent3d { width: size.max(1), height: size.max(1), depth_or_array_layers: 1 };
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let tex = device.create_texture(&wgpu::TextureDescriptor {
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label: Some("sc_access"),
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size: extent,
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mip_level_count: 1,
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sample_count: 1,
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dimension: wgpu::TextureDimension::D2,
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format: wgpu::TextureFormat::R32Float,
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usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
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view_formats: &[],
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});
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if let Some(q) = queue
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&& depth.len() == (size as usize) * (size as usize)
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{
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let bytes: Vec<u8> = depth.iter().flat_map(|x| x.to_le_bytes()).collect();
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q.write_texture(
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wgpu::TexelCopyTextureInfo { texture: &tex, mip_level: 0, origin: wgpu::Origin3d::ZERO, aspect: wgpu::TextureAspect::All },
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&bytes,
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wgpu::TexelCopyBufferLayout { offset: 0, bytes_per_row: Some(4 * size), rows_per_image: Some(size) },
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extent,
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);
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}
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let view = tex.create_view(&Default::default());
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device.create_bind_group(&wgpu::BindGroupDescriptor {
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label: Some("sc_access"),
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layout: bgl,
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entries: &[wgpu::BindGroupEntry { binding: 2, resource: wgpu::BindingResource::TextureView(&view) }],
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})
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}
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const SHADER: &str = r#"
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struct U {
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vp: mat4x4<f32>,
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back: vec4<f32>, // xyz = toward the eye, w = 1 for linear output
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screen: vec4<f32>, // viewport width, height (px), depth bias
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clip: vec4<f32>, // section plane: normal, d (zero normal: no section)
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cap: vec4<f32>, // colour of the inside of cut bodies
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ana: vec4<f32>, // surface analysis: mode (1 zebra, 2 draft, 3 curvature), parameter
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pull: vec4<f32>, // draft pull direction
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acc_u: vec4<f32>, // accessibility map axes (xyz, offset)
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acc_v: vec4<f32>,
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};
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@group(1) @binding(2) var acc_t: texture_2d<f32>;
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fn clipped(p: vec3<f32>) -> bool {
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return length(u.clip.xyz) > 0.5 && dot(u.clip.xyz, p) > u.clip.w;
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}
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@group(0) @binding(0) var<uniform> u: U;
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fn to_linear(c: vec3<f32>) -> vec3<f32> {
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return select(c, pow((c + vec3<f32>(0.055)) / vec3<f32>(1.055), vec3<f32>(2.4)), c > vec3<f32>(0.04045));
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}
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fn out_color(c: vec4<f32>) -> vec4<f32> {
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if (u.back.w > 0.5) {
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return vec4<f32>(to_linear(c.rgb), c.a);
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}
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return c;
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}
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struct TOut {
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@builtin(position) pos: vec4<f32>,
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@location(0) n: vec3<f32>,
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@location(1) c: vec4<f32>,
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@location(2) wp: vec3<f32>,
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};
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@vertex
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fn vs_tri(@location(0) p: vec3<f32>, @location(1) n: vec3<f32>, @location(2) c: vec4<f32>) -> TOut {
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var o: TOut;
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o.pos = u.vp * vec4<f32>(p, 1.0);
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o.n = n;
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o.c = c;
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o.wp = p;
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return o;
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}
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/// Opaque model surfaces: cut by the section plane, the inside shows as a flat cap colour.
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@fragment
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fn fs_solid(i: TOut, @builtin(front_facing) front: bool) -> @location(0) vec4<f32> {
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// Derivatives first, in uniform control flow (browsers' WGSL compilers reject them after
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// a branch that returns; the whole shader module then fails and nothing is drawn).
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let k = curvature(i);
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if (clipped(i.wp)) { discard; }
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if (!front && length(u.clip.xyz) > 0.5) {
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return out_color(u.cap);
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}
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if (u.ana.x > 0.5 && length(i.n) > 0.5) {
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return analysis(i, k);
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}
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return shade(i);
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}
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/// How fast the normal turns across the pixel (per mm).
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fn curvature(i: TOut) -> f32 {
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let nn = normalize(i.n);
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let kx = length(dpdx(nn)) / max(length(dpdx(i.wp)), 1e-6);
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let ky = length(dpdy(nn)) / max(length(dpdy(i.wp)), 1e-6);
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return max(kx, ky);
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}
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/// Surface analysis colours: zebra stripes, draft angle bands, curvature map (`k`: the
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/// surface's curvature here, worked out by the caller).
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fn analysis(i: TOut, k: f32) -> vec4<f32> {
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let v = normalize(u.back.xyz);
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var n = normalize(i.n);
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if (dot(n, v) < 0.0) { n = -n; }
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let lit = 0.55 + 0.45 * max(dot(n, v), 0.0);
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if (u.ana.x < 1.5) {
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// Reflections of upright light bars standing around the viewer: the stripe follows
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// the reflected ray's sideways direction (horizontal on screen).
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let r = reflect(-v, n);
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var side = cross(v, vec3<f32>(0.0, 0.0, 1.0));
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if (length(side) < 1e-3) { side = vec3<f32>(1.0, 0.0, 0.0); }
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let s = sin(dot(r, normalize(side)) * u.ana.y * 3.14159265);
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let c = select(0.08, 0.95, s > 0.0);
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return out_color(vec4<f32>(vec3<f32>(c), 1.0));
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}
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if (u.ana.x > 4.5) {
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// Reachable from the access direction: facing it and nothing above.
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let d = normalize(u.pull.xyz);
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let size = i32(u.ana.w);
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let px = vec2<i32>(floor(vec2<f32>(dot(i.wp, u.acc_u.xyz) + u.acc_u.w, dot(i.wp, u.acc_v.xyz) + u.acc_v.w) * u.ana.z));
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var top = -1e30;
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if (px.x >= 0 && px.y >= 0 && px.x < size && px.y < size) {
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top = textureLoad(acc_t, px, 0).x;
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}
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let cn = dot(normalize(i.n), d);
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let facing = cn > 0.02;
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// Slack of a pixel and a half, more on slopes (the map holds the pixel's highest point).
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let slack = u.ana.y * (1.0 + sqrt(max(1.0 - cn * cn, 0.0)) / max(cn, 0.05));
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let clear = dot(i.wp, d) >= top - slack;
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var c = vec3<f32>(0.85, 0.22, 0.20);
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if (facing && clear) { c = vec3<f32>(0.20, 0.75, 0.30); }
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return out_color(vec4<f32>(c * lit, 1.0));
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}
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if (u.ana.x > 3.5) {
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// A studio around the model: sky above, a dark floor below, a bright horizon band and
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// two soft light panels, seen in a mirror.
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let r = reflect(-v, n);
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var c = mix(vec3<f32>(0.32, 0.34, 0.38), vec3<f32>(0.80, 0.86, 0.95), smoothstep(-0.05, 0.6, r.z));
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c = c + vec3<f32>(0.6) * exp(-abs(r.z) * 40.0);
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let side = atan2(r.y, r.x);
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c = c + vec3<f32>(0.9) * smoothstep(0.92, 0.98, cos(side * 2.0)) * smoothstep(0.1, 0.3, r.z) * smoothstep(0.8, 0.6, r.z);
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if (r.z < -0.02) {
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// The floor: lighter toward the horizon, with light-panel streaks along it.
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c = mix(vec3<f32>(0.55, 0.56, 0.60), vec3<f32>(0.20, 0.20, 0.22), clamp(-r.z * 1.6, 0.0, 1.0));
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c = c + vec3<f32>(0.35) * smoothstep(0.95, 0.99, cos(side * 3.0));
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}
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return out_color(vec4<f32>(min(c, vec3<f32>(1.0)), 1.0));
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||
}
|
||
if (u.ana.x < 2.5) {
|
||
let a = degrees(asin(clamp(dot(normalize(i.n), normalize(u.pull.xyz)), -1.0, 1.0)));
|
||
var c = vec3<f32>(0.95, 0.80, 0.15);
|
||
if (a >= u.ana.y) { c = vec3<f32>(0.20, 0.75, 0.30); }
|
||
if (a <= -u.ana.y) { c = vec3<f32>(0.85, 0.22, 0.20); }
|
||
return out_color(vec4<f32>(c * lit, 1.0));
|
||
}
|
||
// Curvature from how fast the normal turns across the pixel.
|
||
let t = clamp(k * u.ana.y, 0.0, 1.0);
|
||
let c = select(mix(vec3<f32>(0.10, 0.80, 0.25), vec3<f32>(0.90, 0.15, 0.10), t * 2.0 - 1.0),
|
||
mix(vec3<f32>(0.15, 0.35, 0.95), vec3<f32>(0.10, 0.80, 0.25), t * 2.0), t < 0.5);
|
||
return out_color(vec4<f32>(c * lit, 1.0));
|
||
}
|
||
|
||
@fragment
|
||
fn fs_tri(i: TOut) -> @location(0) vec4<f32> {
|
||
if (clipped(i.wp)) { discard; }
|
||
return shade(i);
|
||
}
|
||
|
||
fn shade(i: TOut) -> vec4<f32> {
|
||
// A zero normal marks flat colour (selection fills, translucent planes).
|
||
if (length(i.n) < 0.5) {
|
||
return out_color(i.c);
|
||
}
|
||
let v = normalize(u.back.xyz);
|
||
var n = normalize(i.n);
|
||
if (dot(n, v) < 0.0) { n = -n; }
|
||
let key = normalize(v * 0.8 + vec3<f32>(-0.3, 0.2, 0.6));
|
||
let diff = max(dot(n, key), 0.0);
|
||
let fill = max(dot(n, v), 0.0);
|
||
let h = normalize(key + v);
|
||
let spec = pow(max(dot(n, h), 0.0), 40.0) * 0.25;
|
||
let k = 0.42 + 0.38 * diff + 0.25 * fill;
|
||
return out_color(vec4<f32>(min(i.c.rgb * k + vec3<f32>(spec), vec3<f32>(1.0)), i.c.a));
|
||
}
|
||
|
||
@vertex
|
||
fn vs_ghost(@location(0) p: vec3<f32>, @location(1) n: vec3<f32>, @location(2) c: vec4<f32>) -> TOut {
|
||
var o: TOut;
|
||
o.pos = u.vp * vec4<f32>(p, 1.0);
|
||
o.pos.z = o.pos.z + u.screen.z * 4.0 * o.pos.w;
|
||
o.n = n;
|
||
o.c = c;
|
||
o.wp = p;
|
||
return o;
|
||
}
|
||
|
||
struct LOut {
|
||
@builtin(position) pos: vec4<f32>,
|
||
@location(0) c: vec4<f32>,
|
||
@location(1) wp: vec3<f32>,
|
||
};
|
||
|
||
@vertex
|
||
fn vs_line(@builtin(vertex_index) vi: u32, @location(0) a: vec3<f32>, @location(1) b: vec3<f32>, @location(2) c: vec4<f32>, @location(3) w: f32) -> LOut {
|
||
let ca = u.vp * vec4<f32>(a, 1.0);
|
||
let cb = u.vp * vec4<f32>(b, 1.0);
|
||
let half = u.screen.xy * 0.5;
|
||
let sa = ca.xy / max(ca.w, 1e-6) * half;
|
||
let sb = cb.xy / max(cb.w, 1e-6) * half;
|
||
var dir = sb - sa;
|
||
let len = length(dir);
|
||
if (len < 1e-6) { dir = vec2<f32>(1.0, 0.0); } else { dir = dir / len; }
|
||
let nrm = vec2<f32>(-dir.y, dir.x);
|
||
// Two triangles: corners (t, side).
|
||
var ts = array<f32, 6>(0.0, 1.0, 1.0, 0.0, 1.0, 0.0);
|
||
var ss = array<f32, 6>(-1.0, -1.0, 1.0, -1.0, 1.0, 1.0);
|
||
let t = ts[vi];
|
||
let s = ss[vi];
|
||
let base = select(ca, cb, t > 0.5);
|
||
let off = nrm * s * w * 0.5 + dir * (t * 2.0 - 1.0) * w * 0.5;
|
||
var o: LOut;
|
||
o.pos = vec4<f32>(base.xy + off / half * base.w, base.z - u.screen.z * base.w, base.w);
|
||
o.c = c;
|
||
o.wp = select(a, b, t > 0.5);
|
||
return o;
|
||
}
|
||
|
||
@fragment
|
||
fn fs_line(i: LOut) -> @location(0) vec4<f32> {
|
||
if (clipped(i.wp)) { discard; }
|
||
return out_color(i.c);
|
||
}
|
||
|
||
/// Silhouettes: back faces pushed out along their screen-space normal by about 1.5 px.
|
||
@vertex
|
||
fn vs_outline(@location(0) p: vec3<f32>, @location(1) n: vec3<f32>, @location(2) c: vec4<f32>) -> TOut {
|
||
var o: TOut;
|
||
o.pos = u.vp * vec4<f32>(p, 1.0);
|
||
let nc = (u.vp * vec4<f32>(n, 0.0)).xy * u.screen.xy;
|
||
if (length(nc) > 1e-6) {
|
||
let d = normalize(nc) * 1.5 * 2.0 / u.screen.xy;
|
||
o.pos = vec4<f32>(o.pos.xy + d * o.pos.w, o.pos.zw);
|
||
}
|
||
o.n = vec3<f32>(0.0);
|
||
o.c = c;
|
||
o.wp = p;
|
||
return o;
|
||
}
|
||
|
||
@fragment
|
||
fn fs_outline(i: TOut) -> @location(0) vec4<f32> {
|
||
if (clipped(i.wp)) { discard; }
|
||
return out_color(vec4<f32>(0.07, 0.08, 0.10, 1.0));
|
||
}
|
||
|
||
struct IOut {
|
||
@builtin(position) pos: vec4<f32>,
|
||
@location(0) uv: vec2<f32>,
|
||
@location(1) a: f32,
|
||
@location(2) wp: vec3<f32>,
|
||
};
|
||
|
||
@group(1) @binding(0) var img_t: texture_2d<f32>;
|
||
@group(1) @binding(1) var img_s: sampler;
|
||
|
||
@vertex
|
||
fn vs_img(@location(0) p: vec3<f32>, @location(1) uv: vec2<f32>, @location(2) a: f32) -> IOut {
|
||
var o: IOut;
|
||
o.pos = u.vp * vec4<f32>(p, 1.0);
|
||
// Pulled toward the eye like lines, so a decal on a face is not lost in it.
|
||
o.pos.z = o.pos.z - u.screen.z * o.pos.w;
|
||
o.uv = uv;
|
||
o.a = a;
|
||
o.wp = p;
|
||
return o;
|
||
}
|
||
|
||
@fragment
|
||
fn fs_img(i: IOut) -> @location(0) vec4<f32> {
|
||
let c = textureSample(img_t, img_s, i.uv);
|
||
if (clipped(i.wp)) { discard; }
|
||
return out_color(vec4<f32>(c.rgb, c.a * i.a));
|
||
}
|
||
|
||
/// Lines the section never cuts (the grid, highlights drawn on top).
|
||
@fragment
|
||
fn fs_line_all(i: LOut) -> @location(0) vec4<f32> {
|
||
return out_color(i.c);
|
||
}
|
||
"#;
|
||
|
||
fn tri_layout() -> wgpu::VertexBufferLayout<'static> {
|
||
const A: [wgpu::VertexAttribute; 3] = wgpu::vertex_attr_array![0 => Float32x3, 1 => Float32x3, 2 => Unorm8x4];
|
||
wgpu::VertexBufferLayout { array_stride: TRI_SIZE as u64, step_mode: wgpu::VertexStepMode::Vertex, attributes: &A }
|
||
}
|
||
|
||
fn line_layout() -> wgpu::VertexBufferLayout<'static> {
|
||
const A: [wgpu::VertexAttribute; 4] = wgpu::vertex_attr_array![0 => Float32x3, 1 => Float32x3, 2 => Unorm8x4, 3 => Float32];
|
||
wgpu::VertexBufferLayout { array_stride: LINE_SIZE as u64, step_mode: wgpu::VertexStepMode::Instance, attributes: &A }
|
||
}
|
||
|
||
/// The target configuration: colour format, depth format and MSAA sample count of the app.
|
||
#[derive(Clone, Copy, Debug)]
|
||
pub struct GpuTarget {
|
||
pub format: wgpu::TextureFormat,
|
||
pub depth: Option<wgpu::TextureFormat>,
|
||
pub samples: u32,
|
||
}
|
||
|
||
impl Resources {
|
||
fn new(device: &wgpu::Device, t: GpuTarget) -> Self {
|
||
let module =
|
||
device.create_shader_module(wgpu::ShaderModuleDescriptor { label: Some("sc_viewport"), source: wgpu::ShaderSource::Wgsl(SHADER.into()) });
|
||
let bgl = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
|
||
label: Some("sc_viewport"),
|
||
entries: &[wgpu::BindGroupLayoutEntry {
|
||
binding: 0,
|
||
visibility: wgpu::ShaderStages::VERTEX_FRAGMENT,
|
||
ty: wgpu::BindingType::Buffer { ty: wgpu::BufferBindingType::Uniform, has_dynamic_offset: false, min_binding_size: None },
|
||
count: None,
|
||
}],
|
||
});
|
||
let layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
||
label: Some("sc_viewport"),
|
||
bind_group_layouts: &[Some(&bgl)],
|
||
immediate_size: 0,
|
||
});
|
||
let uniform = device.create_buffer(&wgpu::BufferDescriptor {
|
||
label: Some("sc_viewport_u"),
|
||
size: UNIFORM_SIZE,
|
||
usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
|
||
mapped_at_creation: false,
|
||
});
|
||
let bind = device.create_bind_group(&wgpu::BindGroupDescriptor {
|
||
label: Some("sc_viewport"),
|
||
layout: &bgl,
|
||
entries: &[wgpu::BindGroupEntry { binding: 0, resource: uniform.as_entire_binding() }],
|
||
});
|
||
let depth = |compare: wgpu::CompareFunction, write: bool| -> Option<wgpu::DepthStencilState> {
|
||
t.depth.map(|format| wgpu::DepthStencilState {
|
||
format,
|
||
depth_write_enabled: Some(write),
|
||
depth_compare: Some(compare),
|
||
stencil: Default::default(),
|
||
bias: Default::default(),
|
||
})
|
||
};
|
||
let pipeline = |label: &str,
|
||
vs: &str,
|
||
fs: &str,
|
||
buf: wgpu::VertexBufferLayout<'static>,
|
||
ds: Option<wgpu::DepthStencilState>,
|
||
blend: Option<wgpu::BlendState>| {
|
||
device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
|
||
label: Some(label),
|
||
layout: Some(&layout),
|
||
vertex: wgpu::VertexState { module: &module, entry_point: Some(vs), buffers: &[Some(buf)], compilation_options: Default::default() },
|
||
primitive: wgpu::PrimitiveState { topology: wgpu::PrimitiveTopology::TriangleList, ..Default::default() },
|
||
depth_stencil: ds,
|
||
multisample: wgpu::MultisampleState { count: t.samples.max(1), mask: !0, alpha_to_coverage_enabled: false },
|
||
fragment: Some(wgpu::FragmentState {
|
||
module: &module,
|
||
entry_point: Some(fs),
|
||
targets: &[Some(wgpu::ColorTargetState { format: t.format, blend, write_mask: wgpu::ColorWrites::ALL })],
|
||
compilation_options: Default::default(),
|
||
}),
|
||
multiview_mask: None,
|
||
cache: None,
|
||
})
|
||
};
|
||
let alpha = Some(wgpu::BlendState::ALPHA_BLENDING);
|
||
let glass = |label: &str, cull: wgpu::Face| {
|
||
device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
|
||
label: Some(label),
|
||
layout: Some(&layout),
|
||
vertex: wgpu::VertexState {
|
||
module: &module,
|
||
entry_point: Some("vs_tri"),
|
||
buffers: &[Some(tri_layout())],
|
||
compilation_options: Default::default(),
|
||
},
|
||
primitive: wgpu::PrimitiveState { topology: wgpu::PrimitiveTopology::TriangleList, cull_mode: Some(cull), ..Default::default() },
|
||
depth_stencil: depth(wgpu::CompareFunction::LessEqual, false),
|
||
multisample: wgpu::MultisampleState { count: t.samples.max(1), mask: !0, alpha_to_coverage_enabled: false },
|
||
fragment: Some(wgpu::FragmentState {
|
||
module: &module,
|
||
entry_point: Some("fs_tri"),
|
||
targets: &[Some(wgpu::ColorTargetState { format: t.format, blend: alpha, write_mask: wgpu::ColorWrites::ALL })],
|
||
compilation_options: Default::default(),
|
||
}),
|
||
multiview_mask: None,
|
||
cache: None,
|
||
})
|
||
};
|
||
let image_bgl = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
|
||
label: Some("sc_image"),
|
||
entries: &[
|
||
wgpu::BindGroupLayoutEntry {
|
||
binding: 0,
|
||
visibility: wgpu::ShaderStages::FRAGMENT,
|
||
ty: wgpu::BindingType::Texture {
|
||
sample_type: wgpu::TextureSampleType::Float { filterable: true },
|
||
view_dimension: wgpu::TextureViewDimension::D2,
|
||
multisampled: false,
|
||
},
|
||
count: None,
|
||
},
|
||
wgpu::BindGroupLayoutEntry {
|
||
binding: 1,
|
||
visibility: wgpu::ShaderStages::FRAGMENT,
|
||
ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
|
||
count: None,
|
||
},
|
||
],
|
||
});
|
||
let image_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
||
label: Some("sc_image"),
|
||
bind_group_layouts: &[Some(&bgl), Some(&image_bgl)],
|
||
immediate_size: 0,
|
||
});
|
||
const IA: [wgpu::VertexAttribute; 3] = wgpu::vertex_attr_array![0 => Float32x3, 1 => Float32x2, 2 => Float32];
|
||
let image = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
|
||
label: Some("sc_image"),
|
||
layout: Some(&image_layout),
|
||
vertex: wgpu::VertexState {
|
||
module: &module,
|
||
entry_point: Some("vs_img"),
|
||
buffers: &[Some(wgpu::VertexBufferLayout {
|
||
array_stride: IMG_SIZE as u64,
|
||
step_mode: wgpu::VertexStepMode::Vertex,
|
||
attributes: &IA,
|
||
})],
|
||
compilation_options: Default::default(),
|
||
},
|
||
primitive: wgpu::PrimitiveState { topology: wgpu::PrimitiveTopology::TriangleList, ..Default::default() },
|
||
depth_stencil: depth(wgpu::CompareFunction::LessEqual, false),
|
||
multisample: wgpu::MultisampleState { count: t.samples.max(1), mask: !0, alpha_to_coverage_enabled: false },
|
||
fragment: Some(wgpu::FragmentState {
|
||
module: &module,
|
||
entry_point: Some("fs_img"),
|
||
targets: &[Some(wgpu::ColorTargetState { format: t.format, blend: alpha, write_mask: wgpu::ColorWrites::ALL })],
|
||
compilation_options: Default::default(),
|
||
}),
|
||
multiview_mask: None,
|
||
cache: None,
|
||
});
|
||
let access_bgl = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
|
||
label: Some("sc_access"),
|
||
entries: &[wgpu::BindGroupLayoutEntry {
|
||
binding: 2,
|
||
visibility: wgpu::ShaderStages::FRAGMENT,
|
||
ty: wgpu::BindingType::Texture {
|
||
sample_type: wgpu::TextureSampleType::Float { filterable: false },
|
||
view_dimension: wgpu::TextureViewDimension::D2,
|
||
multisampled: false,
|
||
},
|
||
count: None,
|
||
}],
|
||
});
|
||
let solid_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
|
||
label: Some("sc_solid"),
|
||
bind_group_layouts: &[Some(&bgl), Some(&access_bgl)],
|
||
immediate_size: 0,
|
||
});
|
||
let solid = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
|
||
label: Some("sc_tris"),
|
||
layout: Some(&solid_layout),
|
||
vertex: wgpu::VertexState {
|
||
module: &module,
|
||
entry_point: Some("vs_tri"),
|
||
buffers: &[Some(tri_layout())],
|
||
compilation_options: Default::default(),
|
||
},
|
||
primitive: wgpu::PrimitiveState { topology: wgpu::PrimitiveTopology::TriangleList, ..Default::default() },
|
||
depth_stencil: depth(wgpu::CompareFunction::Less, true),
|
||
multisample: wgpu::MultisampleState { count: t.samples.max(1), mask: !0, alpha_to_coverage_enabled: false },
|
||
fragment: Some(wgpu::FragmentState {
|
||
module: &module,
|
||
entry_point: Some("fs_solid"),
|
||
targets: &[Some(wgpu::ColorTargetState { format: t.format, blend: None, write_mask: wgpu::ColorWrites::ALL })],
|
||
compilation_options: Default::default(),
|
||
}),
|
||
multiview_mask: None,
|
||
cache: None,
|
||
});
|
||
let access_bind = access_texture(device, None, &access_bgl, 1, &[]);
|
||
let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
|
||
label: Some("sc_image"),
|
||
mag_filter: wgpu::FilterMode::Linear,
|
||
min_filter: wgpu::FilterMode::Linear,
|
||
..Default::default()
|
||
});
|
||
Resources {
|
||
image,
|
||
image_bgl,
|
||
sampler,
|
||
textures: Default::default(),
|
||
quads: Vec::new(),
|
||
tri: solid,
|
||
access_bgl,
|
||
access_bind,
|
||
access_version: 0,
|
||
tri_hl: pipeline("sc_tris_hl", "vs_tri", "fs_tri", tri_layout(), depth(wgpu::CompareFunction::LessEqual, false), alpha),
|
||
trans: pipeline("sc_trans", "vs_tri", "fs_tri", tri_layout(), depth(wgpu::CompareFunction::LessEqual, false), alpha),
|
||
glass_far: glass("sc_glass_far", wgpu::Face::Front),
|
||
glass_near: glass("sc_glass_near", wgpu::Face::Back),
|
||
ghost: pipeline("sc_ghost", "vs_ghost", "fs_tri", tri_layout(), depth(wgpu::CompareFunction::LessEqual, false), alpha),
|
||
xray: pipeline("sc_xray", "vs_tri", "fs_tri", tri_layout(), depth(wgpu::CompareFunction::Always, false), alpha),
|
||
line: pipeline("sc_lines", "vs_line", "fs_line", line_layout(), depth(wgpu::CompareFunction::LessEqual, false), alpha),
|
||
line_hidden: pipeline("sc_lines_hidden", "vs_line", "fs_line", line_layout(), depth(wgpu::CompareFunction::Greater, false), alpha),
|
||
outline: device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
|
||
label: Some("sc_outline"),
|
||
layout: Some(&layout),
|
||
vertex: wgpu::VertexState {
|
||
module: &module,
|
||
entry_point: Some("vs_outline"),
|
||
buffers: &[Some(tri_layout())],
|
||
compilation_options: Default::default(),
|
||
},
|
||
primitive: wgpu::PrimitiveState {
|
||
topology: wgpu::PrimitiveTopology::TriangleList,
|
||
cull_mode: Some(wgpu::Face::Front),
|
||
..Default::default()
|
||
},
|
||
depth_stencil: depth(wgpu::CompareFunction::Less, false),
|
||
multisample: wgpu::MultisampleState { count: t.samples.max(1), mask: !0, alpha_to_coverage_enabled: false },
|
||
fragment: Some(wgpu::FragmentState {
|
||
module: &module,
|
||
entry_point: Some("fs_outline"),
|
||
targets: &[Some(wgpu::ColorTargetState { format: t.format, blend: alpha, write_mask: wgpu::ColorWrites::ALL })],
|
||
compilation_options: Default::default(),
|
||
}),
|
||
multiview_mask: None,
|
||
cache: None,
|
||
}),
|
||
overlay: pipeline("sc_overlay", "vs_line", "fs_line_all", line_layout(), depth(wgpu::CompareFunction::Always, false), alpha),
|
||
uniform,
|
||
bind,
|
||
linear_out: t.format.is_srgb(),
|
||
model: Batches::default(),
|
||
highlight: Batches::default(),
|
||
preview: Batches::default(),
|
||
}
|
||
}
|
||
}
|
||
|
||
fn upload(device: &wgpu::Device, label: &str, bytes: &[u8], stride: usize) -> Option<Batch> {
|
||
if bytes.len() < stride {
|
||
return None;
|
||
}
|
||
Some(Batch {
|
||
buffer: device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
|
||
label: Some(label),
|
||
contents: bytes,
|
||
usage: wgpu::BufferUsages::VERTEX,
|
||
}),
|
||
count: u32::try_from(bytes.len() / stride).unwrap_or(0),
|
||
})
|
||
}
|
||
|
||
/// Create the pipelines. Call once with the app's render state and its depth/MSAA settings.
|
||
pub fn install(rs: &egui_wgpu::RenderState, depth_bits: u8, samples: u32) -> GpuTarget {
|
||
let t = GpuTarget { format: rs.target_format, depth: egui_wgpu::depth_format_from_bits(depth_bits, 0), samples };
|
||
let res = Resources::new(&rs.device, t);
|
||
rs.renderer.write().callback_resources.insert(res);
|
||
t
|
||
}
|
||
|
||
impl egui_wgpu::CallbackTrait for ViewportCallback {
|
||
fn prepare(
|
||
&self,
|
||
device: &wgpu::Device,
|
||
queue: &wgpu::Queue,
|
||
_screen: &egui_wgpu::ScreenDescriptor,
|
||
_encoder: &mut wgpu::CommandEncoder,
|
||
resources: &mut egui_wgpu::CallbackResources,
|
||
) -> Vec<wgpu::CommandBuffer> {
|
||
let Some(res) = resources.get_mut::<Resources>() else { return Vec::new() };
|
||
res.model.take(device, self.key, &self.slot);
|
||
res.highlight.take(device, self.hl_key, &self.hl_slot);
|
||
res.preview.take(device, self.pv_key, &self.pv_slot);
|
||
queue.write_buffer(&res.uniform, 0, &uniform_bytes(self, self.size_px[0], self.size_px[1], res.linear_out));
|
||
if let Some(a) = &self.access
|
||
&& a.version != res.access_version
|
||
{
|
||
res.access_bind = access_texture(device, Some(queue), &res.access_bgl, a.size, &a.depth);
|
||
res.access_version = a.version;
|
||
}
|
||
// Images: upload new or changed textures, drop removed ones, rebuild the quads.
|
||
res.textures.retain(|id, _| self.images.iter().any(|i| i.id == *id));
|
||
res.quads.clear();
|
||
for img in &self.images {
|
||
let [w, h] = img.size;
|
||
if w == 0 || h == 0 || img.rgba.len() != (w as usize) * (h as usize) * 4 {
|
||
continue;
|
||
}
|
||
if res.textures.get(&img.id).is_none_or(|t| t.0 != img.version) {
|
||
let size = wgpu::Extent3d { width: w, height: h, depth_or_array_layers: 1 };
|
||
let tex = device.create_texture(&wgpu::TextureDescriptor {
|
||
label: Some("sc_image"),
|
||
size,
|
||
mip_level_count: 1,
|
||
sample_count: 1,
|
||
dimension: wgpu::TextureDimension::D2,
|
||
format: wgpu::TextureFormat::Rgba8Unorm,
|
||
usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
|
||
view_formats: &[],
|
||
});
|
||
queue.write_texture(
|
||
wgpu::TexelCopyTextureInfo { texture: &tex, mip_level: 0, origin: wgpu::Origin3d::ZERO, aspect: wgpu::TextureAspect::All },
|
||
&img.rgba,
|
||
wgpu::TexelCopyBufferLayout { offset: 0, bytes_per_row: Some(4 * w), rows_per_image: Some(h) },
|
||
size,
|
||
);
|
||
let view = tex.create_view(&Default::default());
|
||
let bind = device.create_bind_group(&wgpu::BindGroupDescriptor {
|
||
label: Some("sc_image"),
|
||
layout: &res.image_bgl,
|
||
entries: &[
|
||
wgpu::BindGroupEntry { binding: 0, resource: wgpu::BindingResource::TextureView(&view) },
|
||
wgpu::BindGroupEntry { binding: 1, resource: wgpu::BindingResource::Sampler(&res.sampler) },
|
||
],
|
||
});
|
||
res.textures.insert(img.id, (img.version, bind));
|
||
}
|
||
let c = img.corners;
|
||
let uv = [[0.0_f32, 1.0], [1.0, 1.0], [1.0, 0.0], [0.0, 0.0]];
|
||
let mut bytes = Vec::with_capacity(6 * IMG_SIZE);
|
||
for k in [0, 1, 2, 0, 2, 3] {
|
||
for v in c[k].iter().chain(&uv[k]).chain(std::iter::once(&img.opacity)) {
|
||
bytes.extend_from_slice(&v.to_le_bytes());
|
||
}
|
||
}
|
||
if let Some(b) = upload(device, "sc_image_quad", &bytes, IMG_SIZE) {
|
||
res.quads.push((img.id, b));
|
||
}
|
||
}
|
||
Vec::new()
|
||
}
|
||
|
||
fn paint(&self, info: egui::PaintCallbackInfo, pass: &mut wgpu::RenderPass<'static>, resources: &egui_wgpu::CallbackResources) {
|
||
let Some(res) = resources.get::<Resources>() else { return };
|
||
let vp = info.viewport_in_pixels();
|
||
if vp.width_px <= 0 || vp.height_px <= 0 {
|
||
return;
|
||
}
|
||
pass.set_viewport(vp.left_px as f32, vp.top_px as f32, vp.width_px as f32, vp.height_px as f32, 0.0, 1.0);
|
||
pass.set_bind_group(0, &res.bind, &[]);
|
||
let tris = |pass: &mut wgpu::RenderPass<'static>, p: &wgpu::RenderPipeline, b: &Option<Batch>| {
|
||
if let Some(b) = b {
|
||
pass.set_pipeline(p);
|
||
pass.set_vertex_buffer(0, b.buffer.slice(..));
|
||
pass.draw(0..b.count, 0..1);
|
||
}
|
||
};
|
||
let lines = |pass: &mut wgpu::RenderPass<'static>, p: &wgpu::RenderPipeline, b: &Option<Batch>| {
|
||
if let Some(b) = b {
|
||
pass.set_pipeline(p);
|
||
pass.set_vertex_buffer(0, b.buffer.slice(..));
|
||
pass.draw(0..6, 0..b.count);
|
||
}
|
||
};
|
||
let (m, h, pv) = (&res.model, &res.highlight, &res.preview);
|
||
lines(pass, &res.overlay, &m.under);
|
||
pass.set_bind_group(1, &res.access_bind, &[]);
|
||
tris(pass, &res.tri, &m.tris);
|
||
tris(pass, &res.tri, &pv.tris);
|
||
tris(pass, &res.tri_hl, &h.tris);
|
||
if self.outline {
|
||
tris(pass, &res.outline, &m.tris);
|
||
}
|
||
lines(pass, &res.line, &m.lines);
|
||
lines(pass, &res.line_hidden, &m.hidden);
|
||
lines(pass, &res.line, &pv.lines);
|
||
lines(pass, &res.line, &h.lines);
|
||
for (id, q) in &res.quads {
|
||
if let Some((_, bind)) = res.textures.get(id) {
|
||
pass.set_pipeline(&res.image);
|
||
pass.set_bind_group(1, bind, &[]);
|
||
pass.set_vertex_buffer(0, q.buffer.slice(..));
|
||
pass.draw(0..q.count, 0..1);
|
||
}
|
||
}
|
||
tris(pass, &res.ghost, &pv.ghost);
|
||
tris(pass, &res.glass_far, &m.glass);
|
||
tris(pass, &res.glass_near, &m.glass);
|
||
tris(pass, &res.trans, &m.trans);
|
||
tris(pass, &res.trans, &h.trans);
|
||
tris(pass, &res.xray, &pv.xray);
|
||
lines(pass, &res.overlay, &m.overlays);
|
||
lines(pass, &res.overlay, &h.overlays);
|
||
}
|
||
}
|
||
|
||
/// Uniform bytes for a frame.
|
||
pub fn uniform_bytes(cb: &ViewportCallback, w: f32, h: f32, linear: bool) -> Vec<u8> {
|
||
let mut v: Vec<f32> = cb.view_proj.iter().flatten().copied().collect();
|
||
v.extend([cb.back[0], cb.back[1], cb.back[2], if linear { 1.0 } else { 0.0 }]);
|
||
v.extend([w.max(1.0), h.max(1.0), 2e-4, 0.0]);
|
||
v.extend(cb.clip);
|
||
v.extend(cb.cap);
|
||
v.extend(cb.analysis);
|
||
match &cb.access {
|
||
Some(a) => {
|
||
v.extend(a.u);
|
||
v.extend(a.v);
|
||
}
|
||
None => v.extend([0.0; 8]),
|
||
}
|
||
v.iter().flat_map(|x| x.to_le_bytes()).collect()
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use egui_wgpu::wgpu::naga;
|
||
|
||
/// The viewport shader parses and validates (a bad shader would only fail at run time).
|
||
#[test]
|
||
fn shader_is_valid() {
|
||
let module = naga::front::wgsl::parse_str(super::SHADER).unwrap_or_else(|e| panic!("{}", e.emit_to_string(super::SHADER)));
|
||
naga::valid::Validator::new(naga::valid::ValidationFlags::all(), naga::valid::Capabilities::empty()).validate(&module).unwrap();
|
||
}
|
||
|
||
/// Derivatives and implicit-lod sampling run only in uniform control flow: browsers' WGSL
|
||
/// compilers (Tint) reject them after a branch, and the whole viewport shader then fails,
|
||
/// a black screen on the web (naga accepts it). Every fragment entry point makes such calls
|
||
/// (directly or through a helper) before its first branch or return.
|
||
#[test]
|
||
fn derivatives_only_in_uniform_control_flow() {
|
||
// Without comments (their words are not code).
|
||
let src: String = super::SHADER.lines().map(|l| l.split("//").next().unwrap_or("")).collect::<Vec<_>>().join("\n");
|
||
let src = src.as_str();
|
||
let derivs = ["dpdx(", "dpdy(", "fwidth(", "textureSample("];
|
||
// Functions: name -> body.
|
||
let mut fns: Vec<(String, String, bool)> = Vec::new();
|
||
let mut rest = src;
|
||
let mut fragment = false;
|
||
while let Some(at) = rest.find("fn ") {
|
||
let before = &rest[..at];
|
||
if before.contains("@fragment") {
|
||
fragment = true;
|
||
}
|
||
let Some(open) = rest[at..].find('{') else { break };
|
||
let name = rest[at + 3..].split('(').next().unwrap_or("").trim().to_string();
|
||
let start = at + open;
|
||
let mut depth = 0;
|
||
let mut end = start;
|
||
for (k, ch) in rest[start..].char_indices() {
|
||
match ch {
|
||
'{' => depth += 1,
|
||
'}' => {
|
||
depth -= 1;
|
||
if depth == 0 {
|
||
end = start + k;
|
||
break;
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
fns.push((name, rest[start..=end].to_string(), fragment));
|
||
fragment = false;
|
||
rest = &rest[end + 1..];
|
||
}
|
||
// Helpers that take derivatives (directly or through another helper).
|
||
let mut uses: Vec<String> = Vec::new();
|
||
for _ in 0..8 {
|
||
for (n, body, _) in &fns {
|
||
if !uses.contains(n) && (derivs.iter().any(|d| body.contains(d)) || uses.iter().any(|u| body.contains(&format!("{u}(")))) {
|
||
uses.push(n.clone());
|
||
}
|
||
}
|
||
}
|
||
for (n, body, frag) in &fns {
|
||
let calls: Vec<usize> = derivs
|
||
.iter()
|
||
.map(|d| d.to_string())
|
||
.chain(uses.iter().map(|u| format!("{u}(")))
|
||
.flat_map(|c| body.match_indices(&c).map(|(i, _)| i).collect::<Vec<_>>())
|
||
.collect();
|
||
if calls.is_empty() {
|
||
continue;
|
||
}
|
||
if !*frag {
|
||
// A helper: its own derivatives must come before any branch or return in it.
|
||
let first = ["if (", "return", "discard"].iter().filter_map(|k| body.find(k)).min().unwrap_or(usize::MAX);
|
||
for d in derivs {
|
||
if let Some(i) = body.find(d) {
|
||
assert!(i < first, "{n}: {d} after a branch");
|
||
}
|
||
}
|
||
continue;
|
||
}
|
||
let first = ["if (", "return", "discard"].iter().filter_map(|k| body.find(k)).min().unwrap_or(usize::MAX);
|
||
for c in calls {
|
||
assert!(c < first, "fragment {n}: a derivative after a branch or return: {}", &body[c..(c + 40).min(body.len())]);
|
||
}
|
||
}
|
||
}
|
||
}
|