WebGL arithmetic

webgl.arithmetic

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Selected signal results for external comparison. Field statuses, controls and exact values are retained.

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// Test source pending.

Definition

Per-operation shader pixels, compile/link/readback controls and actual precision retain useful numeric differences.

Find it in the repository

Collector source: core/signals/webgl/arithmetic.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/webgl/arithmetic.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: webgl.arithmetic
Collector: webgl.arithmetic
API / surface: core/signals/webgl/arithmetic.ts
Timeout: 750 ms
Companion signals: None
Fixture inputs: Declared requests (listed below)

Exact request inputs

[
  {
    "key": "webgl.arithmetic.opaque-control",
    "inputs": {
      "opaque-control": {
        "dialect": "GLSL ES 1.00",
        "dimensions": [
          2,
          2
        ],
        "attributes": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "vertexSource": "attribute vec2 position; void main(){gl_Position=vec4(position,0.0,1.0);}",
        "fragmentSource": "precision highp float; uniform vec4 operands; void main(){gl_FragColor=vec4(vec3(17.0,34.0,51.0)/255.0,1.0);}",
        "operands": [
          17,
          20,
          2,
          10
        ],
        "expected": [
          17,
          34,
          51,
          255
        ],
        "encoding": "opaque RGBA8; red = value/255 (sqrt uses value*64/255)"
      }
    },
    "controls": {
      "opaque-control": [
        {
          "relationshipId": "glsl.opaque-control",
          "class": "required",
          "preconditions": [
            "compile/link/framebuffer/error controls passed",
            "opaque 8-bit RGB and alpha readback",
            "dither/blend disabled",
            "highp precision >=16",
            "prior encoding controls satisfied"
          ]
        }
      ]
    }
  },
  {
    "key": "webgl.arithmetic.encoding-control",
    "inputs": {
      "encoding-control": {
        "dialect": "GLSL ES 1.00",
        "dimensions": [
          2,
          2
        ],
        "attributes": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "vertexSource": "attribute vec2 position; void main(){gl_Position=vec4(position,0.0,1.0);}",
        "fragmentSource": "precision highp float; uniform vec4 operands; void main(){gl_FragColor=vec4(vec3(37.0/255.0,0.0,0.0),1.0);}",
        "operands": [
          17,
          20,
          2,
          10
        ],
        "expected": [
          37,
          0,
          0,
          255
        ],
        "encoding": "opaque RGBA8; red = value/255 (sqrt uses value*64/255)"
      }
    },
    "controls": {
      "encoding-control": [
        {
          "relationshipId": "glsl.encoding-control",
          "class": "required",
          "preconditions": [
            "compile/link/framebuffer/error controls passed",
            "opaque 8-bit RGB and alpha readback",
            "dither/blend disabled",
            "highp precision >=16",
            "prior encoding controls satisfied"
          ]
        }
      ]
    }
  },
  {
    "key": "webgl.arithmetic.integer-add",
    "inputs": {
      "integer-add": {
        "dialect": "GLSL ES 1.00",
        "dimensions": [
          2,
          2
        ],
        "attributes": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "vertexSource": "attribute vec2 position; void main(){gl_Position=vec4(position,0.0,1.0);}",
        "fragmentSource": "precision highp float; uniform vec4 operands; void main(){gl_FragColor=vec4(vec3(float(int(operands.x)+int(operands.y))/255.0,0.0,0.0),1.0);}",
        "operands": [
          17,
          20,
          2,
          10
        ],
        "expected": [
          37,
          0,
          0,
          255
        ],
        "encoding": "opaque RGBA8; red = value/255 (sqrt uses value*64/255)"
      }
    },
    "controls": {
      "integer-add": [
        {
          "relationshipId": "glsl.integer-add",
          "class": "required",
          "preconditions": [
            "compile/link/framebuffer/error controls passed",
            "opaque 8-bit RGB and alpha readback",
            "dither/blend disabled",
            "highp precision >=16",
            "prior encoding controls satisfied"
          ]
        }
      ]
    }
  },
  {
    "key": "webgl.arithmetic.matrix-vector",
    "inputs": {
      "matrix-vector": {
        "dialect": "GLSL ES 1.00",
        "dimensions": [
          2,
          2
        ],
        "attributes": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "vertexSource": "attribute vec2 position; void main(){gl_Position=vec4(position,0.0,1.0);}",
        "fragmentSource": "precision highp float; uniform vec4 operands; void main(){gl_FragColor=vec4(vec3((mat2(operands.z,0.0,0.0,1.0)*vec2(operands.w,1.0)).x/255.0+operands.x/255.0,0.0,0.0),1.0);}",
        "operands": [
          17,
          20,
          2,
          10
        ],
        "expected": [
          37,
          0,
          0,
          255
        ],
        "encoding": "opaque RGBA8; red = value/255 (sqrt uses value*64/255)"
      }
    },
    "controls": {
      "matrix-vector": [
        {
          "relationshipId": "glsl.matrix-vector",
          "class": "permitted",
          "preconditions": [
            "compile/link/framebuffer/error controls passed",
            "opaque 8-bit RGB and alpha readback",
            "dither/blend disabled",
            "highp precision >=16",
            "prior encoding controls satisfied"
          ]
        }
      ]
    }
  },
  {
    "key": "webgl.arithmetic.sqrt-response",
    "inputs": {
      "sqrt-response": {
        "dialect": "GLSL ES 1.00",
        "dimensions": [
          2,
          2
        ],
        "attributes": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "vertexSource": "attribute vec2 position; void main(){gl_Position=vec4(position,0.0,1.0);}",
        "fragmentSource": "precision highp float; uniform vec4 operands; void main(){gl_FragColor=vec4(vec3(sqrt(operands.z)*64.0/255.0,0.0,0.0),1.0);}",
        "operands": [
          17,
          20,
          2,
          10
        ],
        "expected": null,
        "encoding": "opaque RGBA8; red = value/255 (sqrt uses value*64/255)"
      }
    },
    "controls": {}
  }
]

One collector runs per invocation. Results and JSON select this signal’s fields; any companions execute in the same collector.

Generated source manifest lists runtime files, fixture URLs and content digests for this build. The Source tab provides a copyable console sample.

Run and edit locally

From the repository root, start the Astro app, then open /signals/webgl.arithmetic. Edit the collector source and reload the page to load its new build.

pnpm run dev:web

In a browser module served by this repository’s Vite graph:

import { createCollector } from "/core/collect"
import { measurementModule } from "/core/signals/webgl/arithmetic"

const signal = measurementModule
const collector = createCollector()
const suite = { signals: [signal] }
const result = await collector.collect(suite)

Reuse the collector owner for repeated calls so collection can enforce cleanup. This returns the collector’s raw result; app/signals/projection.ts selects the retained fields shown on this page.

rg -n 'measurementModule' core app tests
pnpm run check
pnpm run test tests/unit/app/focused-projection.test.ts