WebGL capabilities

webgl.capabilities

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// Test source pending.

Definition

Independent WebGL1/2 renderer claims, extension membership, resource limits, shader precision and actual context attributes.

Find it in the repository

Collector source: core/signals/webgl/capabilities.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/webgl/capabilities.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.capabilities
Collector: webgl.capabilities
API / surface: core/signals/webgl/capabilities.ts
Timeout: 750 ms
Companion signals: None
Fixture inputs: Declared requests (listed below)

Exact request inputs

[
  {
    "key": "webgl.capabilities.webgl-context",
    "inputs": {
      "webgl-context": {
        "kind": "webgl",
        "requested": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "dimensions": [
          1,
          1
        ]
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl-render-limits",
    "inputs": {
      "webgl-ALIASED_LINE_WIDTH_RANGE": {
        "name": "ALIASED_LINE_WIDTH_RANGE"
      },
      "webgl-ALIASED_POINT_SIZE_RANGE": {
        "name": "ALIASED_POINT_SIZE_RANGE"
      },
      "webgl-ALPHA_BITS": {
        "name": "ALPHA_BITS"
      },
      "webgl-BLUE_BITS": {
        "name": "BLUE_BITS"
      },
      "webgl-DEPTH_BITS": {
        "name": "DEPTH_BITS"
      },
      "webgl-GREEN_BITS": {
        "name": "GREEN_BITS"
      },
      "webgl-MAX_COMBINED_TEXTURE_IMAGE_UNITS": {
        "name": "MAX_COMBINED_TEXTURE_IMAGE_UNITS"
      },
      "webgl-MAX_CUBE_MAP_TEXTURE_SIZE": {
        "name": "MAX_CUBE_MAP_TEXTURE_SIZE"
      },
      "webgl-MAX_RENDERBUFFER_SIZE": {
        "name": "MAX_RENDERBUFFER_SIZE"
      },
      "webgl-MAX_TEXTURE_IMAGE_UNITS": {
        "name": "MAX_TEXTURE_IMAGE_UNITS"
      },
      "webgl-MAX_TEXTURE_SIZE": {
        "name": "MAX_TEXTURE_SIZE"
      },
      "webgl-MAX_VIEWPORT_DIMS": {
        "name": "MAX_VIEWPORT_DIMS"
      },
      "webgl-RED_BITS": {
        "name": "RED_BITS"
      },
      "webgl-STENCIL_BITS": {
        "name": "STENCIL_BITS"
      },
      "webgl-SUBPIXEL_BITS": {
        "name": "SUBPIXEL_BITS"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl-shader-limits",
    "inputs": {
      "webgl-MAX_FRAGMENT_UNIFORM_VECTORS": {
        "name": "MAX_FRAGMENT_UNIFORM_VECTORS"
      },
      "webgl-MAX_VARYING_VECTORS": {
        "name": "MAX_VARYING_VECTORS"
      },
      "webgl-MAX_VERTEX_ATTRIBS": {
        "name": "MAX_VERTEX_ATTRIBS"
      },
      "webgl-MAX_VERTEX_TEXTURE_IMAGE_UNITS": {
        "name": "MAX_VERTEX_TEXTURE_IMAGE_UNITS"
      },
      "webgl-MAX_VERTEX_UNIFORM_VECTORS": {
        "name": "MAX_VERTEX_UNIFORM_VECTORS"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl-extensions",
    "inputs": {
      "webgl-extensions": null
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl-precision",
    "inputs": {
      "webgl-FRAGMENT_SHADER-HIGH_FLOAT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "HIGH_FLOAT"
      },
      "webgl-FRAGMENT_SHADER-HIGH_INT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "HIGH_INT"
      },
      "webgl-FRAGMENT_SHADER-LOW_FLOAT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "LOW_FLOAT"
      },
      "webgl-FRAGMENT_SHADER-LOW_INT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "LOW_INT"
      },
      "webgl-FRAGMENT_SHADER-MEDIUM_FLOAT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "MEDIUM_FLOAT"
      },
      "webgl-FRAGMENT_SHADER-MEDIUM_INT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "MEDIUM_INT"
      },
      "webgl-VERTEX_SHADER-HIGH_FLOAT": {
        "stage": "VERTEX_SHADER",
        "precision": "HIGH_FLOAT"
      },
      "webgl-VERTEX_SHADER-HIGH_INT": {
        "stage": "VERTEX_SHADER",
        "precision": "HIGH_INT"
      },
      "webgl-VERTEX_SHADER-LOW_FLOAT": {
        "stage": "VERTEX_SHADER",
        "precision": "LOW_FLOAT"
      },
      "webgl-VERTEX_SHADER-LOW_INT": {
        "stage": "VERTEX_SHADER",
        "precision": "LOW_INT"
      },
      "webgl-VERTEX_SHADER-MEDIUM_FLOAT": {
        "stage": "VERTEX_SHADER",
        "precision": "MEDIUM_FLOAT"
      },
      "webgl-VERTEX_SHADER-MEDIUM_INT": {
        "stage": "VERTEX_SHADER",
        "precision": "MEDIUM_INT"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl-renderer",
    "inputs": {
      "webgl-debug": {
        "extension": "WEBGL_debug_renderer_info"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl2-context",
    "inputs": {
      "webgl2-context": {
        "kind": "webgl2",
        "requested": {
          "alpha": false,
          "antialias": false,
          "depth": false,
          "stencil": false,
          "preserveDrawingBuffer": true
        },
        "dimensions": [
          1,
          1
        ]
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl2-render-limits",
    "inputs": {
      "webgl2-ALIASED_LINE_WIDTH_RANGE": {
        "name": "ALIASED_LINE_WIDTH_RANGE"
      },
      "webgl2-ALIASED_POINT_SIZE_RANGE": {
        "name": "ALIASED_POINT_SIZE_RANGE"
      },
      "webgl2-ALPHA_BITS": {
        "name": "ALPHA_BITS"
      },
      "webgl2-BLUE_BITS": {
        "name": "BLUE_BITS"
      },
      "webgl2-DEPTH_BITS": {
        "name": "DEPTH_BITS"
      },
      "webgl2-GREEN_BITS": {
        "name": "GREEN_BITS"
      },
      "webgl2-MAX_3D_TEXTURE_SIZE": {
        "name": "MAX_3D_TEXTURE_SIZE"
      },
      "webgl2-MAX_ARRAY_TEXTURE_LAYERS": {
        "name": "MAX_ARRAY_TEXTURE_LAYERS"
      },
      "webgl2-MAX_COLOR_ATTACHMENTS": {
        "name": "MAX_COLOR_ATTACHMENTS"
      },
      "webgl2-MAX_COMBINED_TEXTURE_IMAGE_UNITS": {
        "name": "MAX_COMBINED_TEXTURE_IMAGE_UNITS"
      },
      "webgl2-MAX_CUBE_MAP_TEXTURE_SIZE": {
        "name": "MAX_CUBE_MAP_TEXTURE_SIZE"
      },
      "webgl2-MAX_DRAW_BUFFERS": {
        "name": "MAX_DRAW_BUFFERS"
      },
      "webgl2-MAX_ELEMENTS_INDICES": {
        "name": "MAX_ELEMENTS_INDICES"
      },
      "webgl2-MAX_ELEMENTS_VERTICES": {
        "name": "MAX_ELEMENTS_VERTICES"
      },
      "webgl2-MAX_ELEMENT_INDEX": {
        "name": "MAX_ELEMENT_INDEX"
      },
      "webgl2-MAX_PROGRAM_TEXEL_OFFSET": {
        "name": "MAX_PROGRAM_TEXEL_OFFSET"
      },
      "webgl2-MAX_RENDERBUFFER_SIZE": {
        "name": "MAX_RENDERBUFFER_SIZE"
      },
      "webgl2-MAX_SAMPLES": {
        "name": "MAX_SAMPLES"
      },
      "webgl2-MAX_SERVER_WAIT_TIMEOUT": {
        "name": "MAX_SERVER_WAIT_TIMEOUT"
      },
      "webgl2-MAX_TEXTURE_IMAGE_UNITS": {
        "name": "MAX_TEXTURE_IMAGE_UNITS"
      },
      "webgl2-MAX_TEXTURE_SIZE": {
        "name": "MAX_TEXTURE_SIZE"
      },
      "webgl2-MAX_VIEWPORT_DIMS": {
        "name": "MAX_VIEWPORT_DIMS"
      },
      "webgl2-MIN_PROGRAM_TEXEL_OFFSET": {
        "name": "MIN_PROGRAM_TEXEL_OFFSET"
      },
      "webgl2-RED_BITS": {
        "name": "RED_BITS"
      },
      "webgl2-STENCIL_BITS": {
        "name": "STENCIL_BITS"
      },
      "webgl2-SUBPIXEL_BITS": {
        "name": "SUBPIXEL_BITS"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl2-shader-limits",
    "inputs": {
      "webgl2-MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS": {
        "name": "MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS"
      },
      "webgl2-MAX_COMBINED_UNIFORM_BLOCKS": {
        "name": "MAX_COMBINED_UNIFORM_BLOCKS"
      },
      "webgl2-MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS": {
        "name": "MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS"
      },
      "webgl2-MAX_FRAGMENT_INPUT_COMPONENTS": {
        "name": "MAX_FRAGMENT_INPUT_COMPONENTS"
      },
      "webgl2-MAX_FRAGMENT_UNIFORM_BLOCKS": {
        "name": "MAX_FRAGMENT_UNIFORM_BLOCKS"
      },
      "webgl2-MAX_FRAGMENT_UNIFORM_COMPONENTS": {
        "name": "MAX_FRAGMENT_UNIFORM_COMPONENTS"
      },
      "webgl2-MAX_FRAGMENT_UNIFORM_VECTORS": {
        "name": "MAX_FRAGMENT_UNIFORM_VECTORS"
      },
      "webgl2-MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS": {
        "name": "MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS"
      },
      "webgl2-MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS": {
        "name": "MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS"
      },
      "webgl2-MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS": {
        "name": "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS"
      },
      "webgl2-MAX_UNIFORM_BLOCK_SIZE": {
        "name": "MAX_UNIFORM_BLOCK_SIZE"
      },
      "webgl2-MAX_UNIFORM_BUFFER_BINDINGS": {
        "name": "MAX_UNIFORM_BUFFER_BINDINGS"
      },
      "webgl2-MAX_VARYING_COMPONENTS": {
        "name": "MAX_VARYING_COMPONENTS"
      },
      "webgl2-MAX_VARYING_VECTORS": {
        "name": "MAX_VARYING_VECTORS"
      },
      "webgl2-MAX_VERTEX_ATTRIBS": {
        "name": "MAX_VERTEX_ATTRIBS"
      },
      "webgl2-MAX_VERTEX_OUTPUT_COMPONENTS": {
        "name": "MAX_VERTEX_OUTPUT_COMPONENTS"
      },
      "webgl2-MAX_VERTEX_TEXTURE_IMAGE_UNITS": {
        "name": "MAX_VERTEX_TEXTURE_IMAGE_UNITS"
      },
      "webgl2-MAX_VERTEX_UNIFORM_BLOCKS": {
        "name": "MAX_VERTEX_UNIFORM_BLOCKS"
      },
      "webgl2-MAX_VERTEX_UNIFORM_COMPONENTS": {
        "name": "MAX_VERTEX_UNIFORM_COMPONENTS"
      },
      "webgl2-MAX_VERTEX_UNIFORM_VECTORS": {
        "name": "MAX_VERTEX_UNIFORM_VECTORS"
      },
      "webgl2-UNIFORM_BUFFER_OFFSET_ALIGNMENT": {
        "name": "UNIFORM_BUFFER_OFFSET_ALIGNMENT"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl2-extensions",
    "inputs": {
      "webgl2-extensions": null
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl2-precision",
    "inputs": {
      "webgl2-FRAGMENT_SHADER-HIGH_FLOAT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "HIGH_FLOAT"
      },
      "webgl2-FRAGMENT_SHADER-HIGH_INT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "HIGH_INT"
      },
      "webgl2-FRAGMENT_SHADER-LOW_FLOAT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "LOW_FLOAT"
      },
      "webgl2-FRAGMENT_SHADER-LOW_INT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "LOW_INT"
      },
      "webgl2-FRAGMENT_SHADER-MEDIUM_FLOAT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "MEDIUM_FLOAT"
      },
      "webgl2-FRAGMENT_SHADER-MEDIUM_INT": {
        "stage": "FRAGMENT_SHADER",
        "precision": "MEDIUM_INT"
      },
      "webgl2-VERTEX_SHADER-HIGH_FLOAT": {
        "stage": "VERTEX_SHADER",
        "precision": "HIGH_FLOAT"
      },
      "webgl2-VERTEX_SHADER-HIGH_INT": {
        "stage": "VERTEX_SHADER",
        "precision": "HIGH_INT"
      },
      "webgl2-VERTEX_SHADER-LOW_FLOAT": {
        "stage": "VERTEX_SHADER",
        "precision": "LOW_FLOAT"
      },
      "webgl2-VERTEX_SHADER-LOW_INT": {
        "stage": "VERTEX_SHADER",
        "precision": "LOW_INT"
      },
      "webgl2-VERTEX_SHADER-MEDIUM_FLOAT": {
        "stage": "VERTEX_SHADER",
        "precision": "MEDIUM_FLOAT"
      },
      "webgl2-VERTEX_SHADER-MEDIUM_INT": {
        "stage": "VERTEX_SHADER",
        "precision": "MEDIUM_INT"
      }
    },
    "controls": {}
  },
  {
    "key": "webgl.capabilities.webgl2-renderer",
    "inputs": {
      "webgl2-debug": {
        "extension": "WEBGL_debug_renderer_info"
      }
    },
    "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.capabilities. 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/capabilities"

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