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export const description = `
Converts two normalized floating point values to 16-bit signed integers, and then combines them into one u32 value.
Component e[i] of the input is converted to a 16-bit twos complement integer value
⌊ 0.5 + 32767 × min(1, max(-1, e[i])) ⌋ which is then placed in
bits 16 × i through 16 × i + 15 of the result.
`;
import { makeTestGroup } from '../../../../../../common/framework/test_group.js';
import { GPUTest } from '../../../../../gpu_test.js';
import { kValue } from '../../../../../util/constants.js';
import { f32, pack2x16snorm, u32, vec2, Type } from '../../../../../util/conversion.js';
import { quantizeToF32, vectorF32Range } from '../../../../../util/math.js';
import { Case } from '../../case.js';
import { allInputSources, run } from '../../expression.js';
import { builtin } from './builtin.js';
export const g = makeTestGroup(GPUTest);
g.test('pack')
.specURL('https://www.w3.org/TR/WGSL/#pack-builtin-functions')
.desc(
`
@const fn pack2x16snorm(e: vec2<f32>) -> u32
`
)
.params(u => u.combine('inputSource', allInputSources))
.fn(async t => {
const makeCase = (x: number, y: number): Case => {
x = quantizeToF32(x);
y = quantizeToF32(y);
return { input: [vec2(f32(x), f32(y))], expected: u32(pack2x16snorm(x, y)) };
};
// Returns a value normalized to [-1, 1].
const normalizeF32 = (n: number): number => {
return n / kValue.f32.positive.max;
};
const cases: Array<Case> = vectorF32Range(2).flatMap(v => {
return [
makeCase(...(v as [number, number])),
makeCase(...(v.map(normalizeF32) as [number, number])),
];
});
await run(t, builtin('pack2x16snorm'), [Type.vec2f], Type.u32, t.params, cases);
});
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