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export const description = `
Decomposes a 32-bit value into four 8-bit chunks, then reinterprets each chunk
as a signed normalized floating point value.
Component i of the result is max(v ÷ 127, -1), where v is the interpretation of
bits 8×i through 8×i+7 of e as a twos-complement signed integer.
`;
import { makeTestGroup } from '../../../../../../common/framework/test_group.js';
import { GPUTest } from '../../../../../gpu_test.js';
import { TypeF32, TypeU32, TypeVec } from '../../../../../util/conversion.js';
import { unpack4x8snormInterval } from '../../../../../util/f32_interval.js';
import { fullU32Range } from '../../../../../util/math.js';
import { makeCaseCache } from '../../case_cache.js';
import { allInputSources, generateU32ToVectorCases, run } from '../../expression.js';
import { builtin } from './builtin.js';
export const g = makeTestGroup(GPUTest);
export const d = makeCaseCache('unpack4x8snorm', {
u32_const: () => {
return generateU32ToVectorCases(fullU32Range(), 'f32-only', unpack4x8snormInterval);
},
u32_non_const: () => {
return generateU32ToVectorCases(fullU32Range(), 'unfiltered', unpack4x8snormInterval);
},
});
g.test('unpack')
.specURL('https://www.w3.org/TR/WGSL/#unpack-builtin-functions')
.desc(
`
@const fn unpack4x8snorm(e: u32) -> vec4<f32>
`
)
.params(u => u.combine('inputSource', allInputSources))
.fn(async t => {
const cases = await d.get(t.params.inputSource === 'const' ? 'u32_const' : 'u32_non_const');
await run(t, builtin('unpack4x8snorm'), [TypeU32], TypeVec(4, TypeF32), t.params, cases);
});
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