typegpu

name

typegpu

description

TypeGPU is type-safe WebGPU in TypeScript. Use whenever the user writes, debugs, or designs TypeGPU code: 'use gpu' shader functions, tgpu.fn, buffers, textures, bind groups, compute and render pipelines, vertex layouts, slots, accessors, and any TypeGPU API. Shader logic and CPU-side resources are tightly coupled - handle both sides here even if the user only mentions one (e.g. "how do I write a shader", "how do I create a buffer"). Trigger on any mention of typegpu, tgpu, "use gpu", TypedGPU, or WebGPU code written using TypeGPU's schema API (d.*, tgpu.*, std.*). Do NOT trigger for raw WebGPU (using GPUDevice/GPURenderPipeline directly without tgpu), WGSL-only questions, Three.js, Babylon.js, or WebGL.

TypeGPU

A single schema (d.*) defines a GPU type, CPU buffer layout, and TypeScript type at once - no manual alignment, type mapping, or casting. The build plugin unplugin-typegpu transforms 'use gpu'-marked TypeScript for runtime WGSL transpilation, enabling type inference and polymorphism across the CPU/GPU boundary.

This skill targets TypeGPU 0.11.2. If the user's project is on an older release, verify API availability before relying on examples or recommended patterns here.

---

When to read reference files

Read before writing virtually any shader or GPU function — these two cover the rules that trip people up most:

• references/types.md — abstract type resolution, exactly when d.f32() is required vs redundant, sampler/texture schemas for tgpu.fn signatures, CPU-side TgpuBuffer/TgpuTexture TypeScript types. If you skip this, you'll hit type errors.
• references/shaders.md — full std library listing, loops (std.range, tgpu.unroll), tgpu.comptime, outer-scope capture rules, complete builtin reference for all three shader stages, console.log. Read this for any non-trivial shader logic.

Read when the task specifically involves:

• references/pipelines.md — vertex buffers/layouts, attribs wiring, MRT, fullscreen triangle, depth/stencil, blend modes, fragDepth output, loading 3D models (@loaders.gl), resolve API
• references/matrices.md — wgpu-matrix integration, column-major layout, camera uniforms, common.writeSoA, fast-path CPU writes. Read for any 3D work (view/projection matrices, animated transforms, model loading)
• references/textures.md — texture creation, views, samplers, storage textures, mipmaps, multisampling
• references/noise.md — @typegpu/noise (random, distributions, Perlin 2D/3D)
• references/sdf.md — @typegpu/sdf (2D/3D primitives, operators, ray marching, AA masking)
• references/setup.md — install, unplugin-typegpu build plugin, tsover operator overloading
• references/advanced.md — buffer reinterpretation, indirect drawing/dispatch, custom encoders

---

Setup

import tgpu, { d, std, common } from 'typegpu';

const root = await tgpu.init();             // request a GPU device
const root = tgpu.initFromDevice(device);   // or wrap an existing GPUDevice

const context = root.configureContext({ canvas, alphaMode: 'premultiplied' });

Create one root at app startup. Resources from different roots cannot interact.

---

Data schemas (d.*)

A schema defines memory layout and infers TypeScript types; the same schema is used for buffers, shader signatures, and bind group entries.

Scalars

d.f32    d.i32    d.u32    d.f16
// d.bool is NOT host-shareable - use d.u32 in buffers

Vectors and matrices

d.vec2f  d.vec3f  d.vec4f     // f32
d.vec2i  d.vec3i  d.vec4i     // i32
d.vec2u  d.vec3u  d.vec4u     // u32
d.vec2h  d.vec3h  d.vec4h     // f16

d.mat2x2f   d.mat3x3f   d.mat4x4f

Instance types: d.vec3f() -> d.v3f, d.mat4x4f() -> d.m4x4f.

Vector constructors are richly overloaded - use them. They compose from any mix of scalars and smaller vectors that adds up to the right component count:

d.vec3f()              // zero-init: (0, 0, 0)
d.vec3f(1)             // broadcast:  (1, 1, 1)
d.vec3f(1, 2, 3)       // individual components
d.vec3f(someVec2, 1)   // vec2 + scalar
d.vec3f(1, someVec2)   // scalar + vec2

d.vec4f()              // zero-init: (0, 0, 0, 0)
d.vec4f(0.5)           // broadcast:  (0.5, 0.5, 0.5, 0.5)
d.vec4f(rgb, 1)        // vec3 + scalar (common: color + alpha)
d.vec4f(v2a, v2b)      // two vec2s
d.vec4f(1, uv, 0)      // scalar + vec2 + scalar

Swizzles (.xy, .zw, .rgb, .ba, etc.) return vector instances that work as constructor arguments: d.vec4f(pos.xy, vel.zw).

Prefer these overloads over manual component decomposition. Instead of d.vec3f(v.x, v.y, newZ), write d.vec3f(v.xy, newZ).

Compound types

const Particle = d.struct({
  position: d.vec2f,
  velocity: d.vec2f,
  color:    d.vec4f,
});

const ParticleArray = d.arrayOf(Particle, 1000); // fixed-size

Runtime-sized schemas. d.arrayOf(Element) without a count returns a function (n: number) => WgslArray<Element>. This dual nature is the key: pass the function itself (unsized) to bind group layouts, call it with a count (sized) for buffer creation.

// Plain array - arrayOf without count is already a factory:
const layout = tgpu.bindGroupLayout({
  data: { storage: d.arrayOf(d.f32), access: 'mutable' },  // unsized for layout
});
const buf = root.createBuffer(d.arrayOf(d.f32, 1024)).$usage('storage'); // sized for buffer

// Struct with a runtime-sized last field - wrap in a factory function:
const RuntimeStruct = (n: number) =>
  d.struct({
    counter: d.atomic(d.u32),
    items:   d.arrayOf(d.f32, n),  // last field gets the runtime size
  });

const layout2 = tgpu.bindGroupLayout({
  runtimeData: { storage: RuntimeStruct, access: 'mutable' }, // unsized (the function)
});
const buf2 = root.createBuffer(RuntimeStruct(1024)).$usage('storage'); // sized (called)

You cannot pass an unsized schema directly to createBuffer - size must be known on the CPU.

---

GPU functions

TypeGPU compiles TypeScript marked with 'use gpu' into WGSL.

Plain callback (polymorphic)

No explicit signature; best for helper math and flexible utilities.

const rotate = (v: d.v2f, angle: number) => {
  'use gpu';
  const c = std.cos(angle);
  const s = std.sin(angle);
  return d.vec2f(c * v.x - s * v.y, s * v.x + c * v.y);
};

number parameters and unions like d.v2f | d.v3f are polymorphic - TypeGPU generates one WGSL overload per unique call-site type combination. Values captured from outer scope are inlined as WGSL literals; use buffers/uniforms for anything that changes at runtime.

tgpu.fn (explicit types)

Pinned WGSL signature. Use for library code or when you need a fixed WGSL interface.

const rotate = tgpu.fn([d.vec2f, d.f32], d.vec2f)((v, angle) => {
  'use gpu';
  // ...
});

Shader entrypoints

// Compute
const myCompute = tgpu.computeFn({
  workgroupSize: [64],
  in: { gid: d.builtin.globalInvocationId },
})((input) => { 'use gpu'; /* input.gid: d.v3u */ });

// Vertex
const myVertex = tgpu.vertexFn({
  in:  { position: d.vec3f, uv: d.vec2f },
  out: { position: d.builtin.position, fragUv: d.vec2f },
})((input) => {
  'use gpu';
  return { position: d.vec4f(input.position, 1), fragUv: input.uv };
});

// Fragment
const myFragment = tgpu.fragmentFn({
  in: { fragUv: d.vec2f },
  out: d.vec4f,
})((input) => { 'use gpu'; return d.vec4f(input.fragUv, 0, 1); });

Vertex in may include builtins: d.builtin.vertexIndex, d.builtin.instanceIndex.

Full shader syntax, branch pruning, the std library, and type inference: see references/shaders.md.

---

Values vs references — the most common source of ResolutionError. See references/shaders.md.

Idiomatic patterns (vector ops, struct constructors, register pressure): see references/shaders.md.

---

Buffers

Creating

// Schema only:
const buf = root.createBuffer(d.arrayOf(Particle, 1000)).$usage('storage');

// With typed initial value (only when non-zero — all buffers are zero-initialized by default):
const uBuf = root.createBuffer(Config, { time: 1, scale: 2.0 }).$usage('uniform');

// With an initializer callback - buffer is still mapped (cheapest CPU path):
const buf = root.createBuffer(Schema, (mappedBuffer) => {
  mappedBuffer.write([10, 20], { startOffset: firstChunk.offset });
  mappedBuffer.write([30, 40], { startOffset: secondChunk.offset });
});

// Wrap an existing GPUBuffer (you own its lifecycle and flags):
const buf = root.createBuffer(d.u32, existingGPUBuffer);
buf.write(12);

Usage flags

Literal	Shader access
'uniform'	var<uniform>
'storage'	var<storage, read> (or read_write with access: 'mutable')
'vertex'	vertex input, paired with tgpu.vertexLayout
'index'	index buffer (d.u16 or d.u32 schema only)
'indirect'	indirect dispatch/draw

All buffers get COPY_SRC | COPY_DST automatically. $addFlags(GPUBufferUsage.X) adds any flag not covered by $usage.

Writing

.write(value) handles alignment. Four input forms (slowest → fastest):

Form	Example (vec3f)	Notes
Typed instance	d.vec3f(1, 2, 3)	Allocates a wrapper — fine for setup/prototypes
Plain JS array / tuple	[1, 2, 3]	No allocation, padding added automatically
TypedArray	new Float32Array([1, 2, 3])	Bytes copied verbatim — must include WGSL padding
ArrayBuffer	rawBytes	Maximum throughput, bytes copied verbatim

Cache plain arrays or Float32Array at setup and reuse. For the padding rules (vec3f = 16 bytes, mat3x3f per-column padding) and full fast-path guidance, see references/matrices.md.

Slice write - update a sub-region using d.memoryLayoutOf to get byte offsets:

const layout = d.memoryLayoutOf(schema, (a) => a[3]);
buffer.write([4, 5, 6], { startOffset: layout.offset });

.patch(data) - update specific struct fields or array indices without touching the rest:

planetBuffer.patch({
  mass: 123.1,
  colors: { 2: [1, 0, 0], 4: d.vec3f(0, 0, 1) },
});

common.writeSoA(buffer, { field: Float32Array, ... }) - scatter separate packed per-field arrays into the GPU's AoS layout with correct padding. The idiomatic path for particle systems, simulations, and model loading where CPU data is already field-separated. See references/matrices.md for examples and references/pipelines.md for the model-loading pattern.

GPU-side copy: destBuffer.copyFrom(srcBuffer) (schemas must match).

Reading

const data = await buffer.read(); // returns a typed JS value matching the schema

Shorthand "fixed" resources

Skip manual bind groups - the buffer is always bound when referenced in any shader:

const particlesMutable = root.createMutable(d.arrayOf(Particle, 1000));  // var<storage, read_write>
const configUniform    = root.createUniform(Config);                     // var<uniform>
const bufReadonly      = root.createReadonly(d.arrayOf(d.f32, N));       // var<storage, read>

Access inside shaders via particles.$, config.$. Prefer fixed resources by default; switch to manual bind groups when you need to swap resources per frame, manage @group indices, or share layouts across pipelines.

---

Bind group layouts (manual binding)

const layout = tgpu.bindGroupLayout({
  config:    { uniform: ConfigSchema },
  particles: { storage: d.arrayOf(Particle), access: 'mutable' },
  mySampler: { sampler: 'filtering' },   // 'filtering' | 'non-filtering' | 'comparison'
  myTexture: { texture: d.texture2d(d.f32) },
});

// Inside shaders: layout.$.config, layout.$.particles, ...

const bindGroup = root.createBindGroup(layout, {
  config:    configBuffer,
  particles: particleBuffer,
  mySampler: tgpuSampler,
  myTexture: textureOrView,
});

pipeline.with(bindGroup).dispatchWorkgroups(N);

Explicit @group index (only needed when integrating with raw WGSL that hardcodes group indices): layout.$idx(0).

---

Compute pipelines

// Standard - you control workgroup sizing
const pipeline = root.createComputePipeline({ compute: myComputeFn });
pipeline.with(bindGroup).dispatchWorkgroups(Math.ceil(N / 64));

// Guarded - TypeGPU handles workgroup sizing and bounds checking automatically.
// The callback's parameter count sets the dimensionality (0D to 3D):
const p0 = root.createGuardedComputePipeline(() => { 'use gpu'; /* runs once */ });
const p1 = root.createGuardedComputePipeline((x: number) => { 'use gpu'; });
const p2 = root.createGuardedComputePipeline((x: number, y: number) => { 'use gpu'; });
const p3 = root.createGuardedComputePipeline((x: number, y: number, z: number) => { 'use gpu'; });

// dispatchThreads matches the callback's arity - pass thread counts, not workgroup counts.
// TypeGPU picks workgroup sizes internally and injects a bounds guard so threads
// outside the requested range are no-ops.
p2.with(bindGroup).dispatchThreads(width, height);

// WGSL builtins like globalInvocationId are NOT available - use the callback parameters instead.

---

WebGPU coordinate conventions

WebGPU matches DirectX/Metal, not OpenGL/WebGL — porting tutorials verbatim causes subtle bugs:

• NDC z: [0, 1], not [-1, 1]. A copy-pasted gluPerspective clips the near plane. Use wgpu-matrix's mat4.perspective (already targets [0, 1]), or mat4.perspectiveReverseZ for better depth precision.
• Framebuffer (0, 0) is top-left, +y down — opposite of OpenGL. d.builtin.position.xy in a fragment shader is pixel-space with this origin.
• Texture UV (0, 0) is top-left. Do not pre-flip v — createImageBitmap already matches this.
• Matrices are column-major: d.mat4x4f(c0, c1, c2, c3) takes columns. Inside shaders use mat.columns[c][r]; plain mat[i] is rejected. Composition: projection * view * model * position. See references/matrices.md.

---

Render pipelines

const pipeline = root.createRenderPipeline({
  vertex:   myVertex,
  fragment: myFragment,
  targets:  { format: presentationFormat }, // single target - shorthand
  primitive?:    GPUPrimitiveState,
  depthStencil?: GPUDepthStencilState,
  multisample?:  GPUMultisampleState,
});

pipeline
  .with(bindGroup)
  .withColorAttachment({
    view: context,
    // loadOp/storeOp/clearValue have defaults
  })
  .withDepthStencilAttachment({ /* ... */ })
  .withIndexBuffer(indexBuffer)  // enables .drawIndexed()
  .draw(vertexCount, instanceCount /* optional */);

Shell-less inline vertex/fragment lambdas are also valid for simple cases.

Multiple render targets (MRT)

Use a named record for fragment out, pipeline targets, and withColorAttachment — TypeScript enforces matching keys. Keys become WGSL struct field names verbatim; no $-prefixes. Builtins (fragDepth) go in out but do not appear in targets or withColorAttachment.

Full MRT example, per-target blend/writeMask config, and the fragDepth footgun: see references/pipelines.md.

Cache bind groups and views

root.createBindGroup(...) and texture.createView(...) allocate fresh GPU objects each call. Fine for prototypes; for anything you care about, create them once at setup (near the resource they wrap), store handles in consts, and reuse. Per-frame allocation isn't slow per se, but it raises GC pressure and introduces stutters. When a view or bind group legitimately varies each frame, cache the small set you cycle through.

For vertex buffer layouts, the attribs spread trick, and the common.fullScreenTriangle helper: references/pipelines.md.

---

GPU-scoped variables

tgpu.workgroupVar(schema) — shared across all threads in a workgroup (compute only). tgpu.privateVar(schema) — thread-private. tgpu.const(schema, value) — compile-time constant embedded as a WGSL literal. Access all via .$. Full examples in references/shaders.md.

---

Slots

tgpu.slot<T>() is a typed placeholder; fill with .with(slot, value) at pipeline, root, or function scope. Any type fits: GPU values, functions, callbacks. Slots are the idiomatic way to build configurable/reusable shaders.

const distFnSlot = tgpu.slot<(pos: d.v3f) => number>();

const rayMarcher = tgpu.computeFn({
  workgroupSize: [64],
  in: { gid: d.builtin.globalInvocationId },
})(({ gid }) => {
  'use gpu';
  const dist = distFnSlot.$(d.vec3f(gid)); // call the injected function
});

root
  .with(distFnSlot, (pos) => {
    'use gpu';
    return std.length(pos - d.vec3f(0, 0, -5)) - 1.0; // sphere SDF
  })
  .createComputePipeline({ compute: rayMarcher });

Scalar/vector slot with a default:

const colorSlot = tgpu.slot(d.vec4f(1, 0, 0, 1));
pipeline.with(colorSlot, d.vec4f(0, 1, 0, 1)).draw(3);

---

Accessors

tgpu.accessor(schema, initial?) is schema-aware - the value can be a buffer binding, a constant, a literal, or a 'use gpu' function returning one. The shader is agnostic about how the value is sourced. If they can be cleanly used, they should be preferred over slots.

const colorAccess = tgpu.accessor(d.vec3f);

// Fill with a uniform buffer:
root.with(colorAccess, colorUniform).createComputePipeline(...)

// Fill with a literal (inlined):
root.with(colorAccess, d.vec3f(1, 0, 0)).createComputePipeline(...)

// Fill with a GPU function:
root.with(colorAccess, () => { 'use gpu'; return computeColor(); }).createComputePipeline(...)

Write access: tgpu.mutableAccessor(schema, initial?).

---

Type utilities

d.InferInput<typeof Schema> — CPU-side type accepted by .write(). d.InferGPU<typeof Schema> — type inside 'use gpu' functions. AnyData (from 'typegpu') — broadest schema constraint for generics. Full buffer/texture TypeScript types (TgpuBuffer, TgpuUniform, TgpuTexture, usage flags): references/types.md.

---

Common pitfalls

1. Numeric literals: 1.0 may strip -> abstractInt. Use d.f32(1). See types.md.
2. Outer-scope captures are constants: not runtime-mutable. Use createUniform/createMutable. See shaders.md.
3. TypedArray/ArrayBuffer alignment: bytes copied verbatim. vec3f elements are 16 bytes (12 + 4 padding). Plain arrays handle padding; typed arrays must include it.
4. Integer division: a / b on primitives is f32. Use d.i32()/d.u32() for integer semantics. See types.md.
5. Uninitialised variables: let x; is invalid - always initialise so the type can be inferred: let x = d.f32(0).
6. Ternary operators: runtime ternaries aren't supported. Use std.select(falseVal, trueVal, condition).
7. Fragment output is always d.vec4f, even for fewer-channel formats. A pipeline with targets: { format: 'r8unorm' } or 'rg16float' still requires out: d.vec4f and return d.vec4f(...). WebGPU drops the unused channels.

---

Companion packages

• @typegpu/noise - real PRNG (randf), distributions (uniform, normal, hemisphere, ...), and Perlin noise (perlin2d/perlin3d) with optional precomputed gradient caches (~10x speedups). Prefer over hand-rolled hashes. See references/noise.md.

• @typegpu/sdf - 2D/3D signed distance primitives (sdDisk, sdBox2d, sdRoundedBox2d, sdBezier, sdSphere, sdBox3d, sdCapsule, sdPlane, ...) and operators (opUnion, opSmoothUnion, opSmoothDifference, opExtrudeX/Y/Z). All tgpu.fn with pinned types, callable directly from 'use gpu'. For ray marching, UI masking, AA vector drawing. See references/sdf.md.

• wgpu-matrix - canonical math library for TypeGPU. TypeGPU vectors/matrices can be passed as dst to wgpu-matrix calls to avoid allocations. See references/matrices.md for full integration patterns.