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export const description = `
Execution tests for the 'smoothstep' builtin function

S is abstract-float, f32, f16
T is S or vecN<S>
@const fn smoothstep(low: T , high: T , x: T ) -> T
Returns the smooth Hermite interpolation between 0 and 1.
Component-wise when T is a vector.
For scalar T, the result is t * t * (3.0 - 2.0 * t), where t = clamp((x - low) / (high - low), 0.0, 1.0).

If low >= high:
* It is a shader-creation error if low and high are const-expressions.
* It is a pipeline-creation error if low and high are override-expressions.
`;

import { makeTestGroup } from '../../../../../../common/framework/test_group.js';
import { AllFeaturesMaxLimitsGPUTest } from '../../../../../gpu_test.js';
import { ScalarValue, Type, Value } from '../../../../../util/conversion.js';
import { Case } from '../../case.js';
import { allInputSources, onlyConstInputSource, run } from '../../expression.js';

import { abstractFloatBuiltin, builtin } from './builtin.js';
import { d } from './smoothstep.cache.js';

export const g = makeTestGroup(AllFeaturesMaxLimitsGPUTest);

// Returns true if `c` is valid for a const evaluation of smoothstep.
function validForConst(c: Case): boolean {
  const low = (c.input as Value[])[0] as ScalarValue;
  const high = (c.input as Value[])[1] as ScalarValue;
  return low.value !== high.value;
}

g.test('abstract_float')
  .specURL('https://www.w3.org/TR/WGSL/#float-builtin-functions')
  .desc(`abstract float tests`)
  .params(u =>
    u
      .combine('inputSource', onlyConstInputSource)
      .combine('vectorize', [undefined, 2, 3, 4] as const)
  )
  .fn(async t => {
    const cases = (await d.get('abstract_const')).filter(c => validForConst(c));
    await run(
      t,
      abstractFloatBuiltin('smoothstep'),
      [Type.abstractFloat, Type.abstractFloat, Type.abstractFloat],
      Type.abstractFloat,
      t.params,
      cases
    );
  });

g.test('f32')
  .specURL('https://www.w3.org/TR/WGSL/#float-builtin-functions')
  .desc(`f32 tests`)
  .params(u =>
    u.combine('inputSource', allInputSources).combine('vectorize', [undefined, 2, 3, 4] as const)
  )
  .fn(async t => {
    const cases = await d.get(t.params.inputSource === 'const' ? 'f32_const' : 'f32_non_const');
    const validCases = cases.filter(c => t.params.inputSource !== 'const' || validForConst(c));
    await run(
      t,
      builtin('smoothstep'),
      [Type.f32, Type.f32, Type.f32],
      Type.f32,
      t.params,
      validCases
    );
  });

g.test('f16')
  .specURL('https://www.w3.org/TR/WGSL/#float-builtin-functions')
  .desc(`f16 tests`)
  .params(u =>
    u.combine('inputSource', allInputSources).combine('vectorize', [undefined, 2, 3, 4] as const)
  )
  .fn(async t => {
    t.skipIfDeviceDoesNotHaveFeature('shader-f16');
    const cases = await d.get(t.params.inputSource === 'const' ? 'f16_const' : 'f16_non_const');
    const validCases = cases.filter(c => t.params.inputSource !== 'const' || validForConst(c));
    await run(
      t,
      builtin('smoothstep'),
      [Type.f16, Type.f16, Type.f16],
      Type.f16,
      t.params,
      validCases
    );
  });