Verification

On every push

The repository's CI runs these on every push and pull request, in the CI workflow:

1. The same module compiles to a CPU function that runs in f64 arithmetic. In its default mode only its equality tests round to f32 first, so they agree with the GPU; an f32 mode that rounds after every operation is opt-in. The test suite checks that function against known answers and against a second CPU backend, generated JavaScript, which must match it bit for bit. It says nothing about what rounding does on a driver, and no GPU output is compared against it in this repository. src/core/oracle.ts
2. The compile gate emits every registered example, hands each WGSL emit to Tint inside headless Chromium, and compiles and links both GLSL ES 3.00 stages of every renderable example on a real WebGL2 context. It also hands each compiler a shader that cannot compile: if either accepts that non-program, the gate fails and the verdicts on the examples do not count. scripts/compile-gate.ts
3. Golden files hold the emitted bytes of every example, so any change in a backend surfaces as a diff in review. emit-goldens.test.ts

The same pass on both backends

The gradient pass from the front page, drawn once by each backend. No pixel comparison between the two is committed yet.

const U = uniformStruct('Uniforms', { group: 0, binding: 0, as: 'U' }, {
  time: f32T, top: vec4fT, bottom: vec4fT,
})

const fsGradient = fn('fs_gradient', { vo: VsOut }, (p) => {
  const t = p.vo.uv.y.add(U.field.time.mul(0.05))
  return vec4(mix(U.field.bottom.rgb, U.field.colour.rgb, t), f32(1))
}, { stage: 'fragment', retAttr: '@location(0)' })

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