webgl-precision

Webpage for computing and displaying a devices float, int, and uint precision for vertex and fragment shaders. Includes a test shader for visually determining floating point precision referenced from ARM community articles on floating point precision part 1 and part 2. See the computePrecision function for more information on how the precision and number of bits are computed.

Notes

• Floating point precision is computed by progressively adding smaller and smaller negative powers of 2 to 1.0 until they have no effect.
• Uint and Int bits are computed by shifting bits until the number rolls around to 0 or turns negative respectively.
• On some hardware the precision artifacts seem to be able to optimized out of the computations resulting in a perfect looking test screen that is not representative of the actual floating point precision.
• Shader precision for floats and ints are set to "highp" for the renderer.