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export const description = `Validation tests for the interpolate attribute`;
import { makeTestGroup } from '../../../../common/framework/test_group.js';
import { ShaderValidationTest } from '../shader_validation_test.js';
import { generateShader } from './util.js';
export const g = makeTestGroup(ShaderValidationTest);
// List of valid interpolation attributes.
const kValidInterpolationAttributes = new Set([
'',
'@interpolate(flat)',
'@interpolate(perspective)',
'@interpolate(perspective, center)',
'@interpolate(perspective, centroid)',
'@interpolate(perspective, sample)',
'@interpolate(linear)',
'@interpolate(linear, center)',
'@interpolate(linear, centroid)',
'@interpolate(linear, sample)',
]);
g.test('type_and_sampling')
.desc(`Test that all combinations of interpolation type and sampling are validated correctly.`)
.params(u =>
u
.combine('stage', ['vertex', 'fragment'] as const)
.combine('io', ['in', 'out'] as const)
.combine('use_struct', [true, false] as const)
.combine('type', [
'',
'flat',
'perspective',
'linear',
'center', // Invalid as first param
'centroid', // Invalid as first param
'sample', // Invalid as first param
] as const)
.combine('sampling', [
'',
'center',
'centroid',
'sample',
'flat', // Invalid as second param
'perspective', // Invalid as second param
'linear', // Invalid as second param
] as const)
.beginSubcases()
)
.fn(t => {
if (t.params.stage === 'vertex' && t.params.use_struct === false) {
t.skip('vertex output must include a position builtin, so must use a struct');
}
let interpolate = '';
if (t.params.type !== '' || t.params.sampling !== '') {
interpolate = '@interpolate(';
if (t.params.type !== '') {
interpolate += `${t.params.type}`;
}
if (t.params.sampling !== '') {
interpolate += `, ${t.params.sampling}`;
}
interpolate += `)`;
}
const code = generateShader({
attribute: '@location(0)' + interpolate,
type: 'f32',
stage: t.params.stage,
io: t.params.io,
use_struct: t.params.use_struct,
});
t.expectCompileResult(kValidInterpolationAttributes.has(interpolate), code);
});
g.test('require_location')
.desc(`Test that the interpolate attribute is only accepted with user-defined IO.`)
.params(u =>
u
.combine('stage', ['vertex', 'fragment'] as const)
.combine('attribute', ['@location(0)', '@builtin(position)'] as const)
.combine('use_struct', [true, false] as const)
.beginSubcases()
)
.fn(t => {
if (
t.params.stage === 'vertex' &&
t.params.use_struct === false &&
!t.params.attribute.includes('position')
) {
t.skip('vertex output must include a position builtin, so must use a struct');
}
const code = generateShader({
attribute: t.params.attribute + `@interpolate(flat)`,
type: 'vec4<f32>',
stage: t.params.stage,
io: t.params.stage === 'fragment' ? 'in' : 'out',
use_struct: t.params.use_struct,
});
t.expectCompileResult(t.params.attribute === '@location(0)', code);
});
g.test('integral_types')
.desc(`Test that the implementation requires @interpolate(flat) for integral user-defined IO.`)
.params(u =>
u
.combine('stage', ['vertex', 'fragment'] as const)
.combine('type', ['i32', 'u32', 'vec2<i32>', 'vec4<u32>'] as const)
.combine('use_struct', [true, false] as const)
.combine('attribute', kValidInterpolationAttributes)
.beginSubcases()
)
.fn(t => {
if (t.params.stage === 'vertex' && t.params.use_struct === false) {
t.skip('vertex output must include a position builtin, so must use a struct');
}
const code = generateShader({
attribute: '@location(0)' + t.params.attribute,
type: t.params.type,
stage: t.params.stage,
io: t.params.stage === 'vertex' ? 'out' : 'in',
use_struct: t.params.use_struct,
});
t.expectCompileResult(t.params.attribute === '@interpolate(flat)', code);
});
g.test('duplicate')
.desc(`Test that the interpolate attribute can only be applied once.`)
.params(u => u.combine('attr', ['', '@interpolate(flat)'] as const))
.fn(t => {
const code = generateShader({
attribute: `@location(0) @interpolate(flat) ${t.params.attr}`,
type: 'vec4<f32>',
stage: 'fragment',
io: 'in',
use_struct: false,
});
t.expectCompileResult(t.params.attr === '', code);
});
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