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/* Data used for multisample tests */
const samplePositionToFragmentPosition = (pos: readonly number[]): readonly number[] =>
pos.map(v => v / 16);
const samplePositionsToFragmentPositions = (
positions: readonly (readonly number[])[]
): readonly (readonly number[])[] => positions.map(samplePositionToFragmentPosition);
// These are sample positions based on a 16x16 grid with 0,0 at the top left.
// For example 8,8 would be a fragment coordinate of 0.5, 0.5
// Based on: https://learn.microsoft.com/en-us/windows/win32/api/d3d11/ne-d3d11-d3d11_standard_multisample_quality_levels
const kMultisamplingTables = new Map<number, readonly (readonly number[])[]>([
[1, samplePositionsToFragmentPositions([[8, 8]])],
[
2,
samplePositionsToFragmentPositions([
[4, 4],
[12, 12],
]),
],
[
4,
samplePositionsToFragmentPositions([
[6, 2],
[14, 6],
[2, 10],
[10, 14],
]),
],
[
8,
samplePositionsToFragmentPositions([
[9, 5],
[7, 11],
[13, 9],
[5, 3],
[3, 13],
[1, 7],
[11, 15],
[15, 1],
]),
],
[
16,
samplePositionsToFragmentPositions([
[9, 9],
[7, 5],
[5, 10],
[12, 7],
[3, 6],
[10, 13],
[13, 11],
[11, 3],
[6, 14],
[8, 1],
[4, 2],
[2, 12],
[0, 8],
[15, 4],
[14, 15],
[1, 0],
]),
],
]);
/**
* For a given sampleCount returns an array of 2d fragment offsets
* where each offset is between 0 and 1.
*/
export function getMultisampleFragmentOffsets(sampleCount: number) {
return kMultisamplingTables.get(sampleCount)!;
}
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