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

Returns the number of mip levels of a texture.
`;

import { makeTestGroup } from '../../../../../../common/framework/test_group.js';
import { AllFeaturesMaxLimitsGPUTest } from '../../../../../gpu_test.js';
import { getTextureDimensionFromView } from '../../../../../util/texture/base.js';
import { kShaderStages } from '../../../../validation/decl/util.js';

import { executeTextureQueryAndExpectResult, kSampleTypeInfo } from './texture_utils.js';

function getLevelSettingsAndExpected(viewType: 'full' | 'partial', mipLevelCount: number) {
  return viewType === 'partial'
    ? {
        baseMipLevel: 1,
        mipLevelCount: 2,
        expected: [2],
      }
    : {
        baseMipLevel: 0,
        mipLevelCount,
        expected: [mipLevelCount],
      };
}

const kTextureTypeToViewDimension = {
  texture_1d: '1d',
  texture_2d: '2d',
  texture_2d_array: '2d-array',
  texture_3d: '3d',
  texture_cube: 'cube',
  texture_cube_array: 'cube-array',
  texture_depth_2d: '2d',
  texture_depth_2d_array: '2d-array',
  texture_depth_cube: 'cube',
  texture_depth_cube_array: 'cube-array',
} as const;

export const g = makeTestGroup(AllFeaturesMaxLimitsGPUTest);

g.test('sampled')
  .specURL('https://www.w3.org/TR/WGSL/#texturenumlevels')
  .desc(
    `
T, a sampled type.

fn textureNumLevels(t: texture_1d<T>) -> u32
fn textureNumLevels(t: texture_2d<T>) -> u32
fn textureNumLevels(t: texture_2d_array<T>) -> u32
fn textureNumLevels(t: texture_3d<T>) -> u32
fn textureNumLevels(t: texture_cube<T>) -> u32
fn textureNumLevels(t: texture_cube_array<T>) -> u32

Parameters
 * t The sampled array texture.
`
  )
  .params(u =>
    u
      .combine('texture_type', [
        'texture_1d',
        'texture_2d',
        'texture_2d_array',
        'texture_3d',
        'texture_cube',
        'texture_cube_array',
      ] as const)
      .beginSubcases()
      .combine('stage', kShaderStages)
      .combine('sampled_type', ['f32', 'i32', 'u32'] as const)
      .combine('view_type', ['full', 'partial'] as const)
      // 1d textures can't have mipLevelCount > 0
      .filter(t => t.texture_type !== 'texture_1d' || t.view_type !== 'partial')
  )
  .fn(t => {
    const { stage, texture_type, sampled_type, view_type } = t.params;
    const { format } = kSampleTypeInfo[sampled_type];
    t.skipIfTextureViewDimensionNotSupported(kTextureTypeToViewDimension[t.params.texture_type]);

    const viewDimension = kTextureTypeToViewDimension[texture_type];
    const dimension = getTextureDimensionFromView(viewDimension);
    const isCube = texture_type.includes('cube');
    const width = 64;
    const height = dimension === '1d' ? 1 : width;
    const depthOrArrayLayers = isCube ? 6 : 1;
    const mipCount = dimension === '1d' ? 1 : 4;
    const texture = t.createTextureTracked({
      format,
      dimension,
      ...(t.isCompatibility && { textureBindingViewDimension: viewDimension }),
      usage: GPUTextureUsage.TEXTURE_BINDING,
      size: {
        width,
        height,
        depthOrArrayLayers,
      },
      mipLevelCount: mipCount,
    });

    const code = `
@group(0) @binding(0) var t: ${texture_type}<${sampled_type}>;
@group(0) @binding(1) var<storage, read_write> result: u32;
fn getValue() -> u32 {
  return textureNumLevels(t);
}
    `;

    const { baseMipLevel, mipLevelCount, expected } = getLevelSettingsAndExpected(
      view_type,
      mipCount
    );
    const viewDescription = {
      dimension: viewDimension,
      baseMipLevel,
      mipLevelCount,
    };

    executeTextureQueryAndExpectResult(t, stage, code, texture, viewDescription, expected);
  });

g.test('depth')
  .specURL('https://www.w3.org/TR/WGSL/#texturenumlevels')
  .desc(
    `
fn textureNumLevels(t: texture_depth_2d) -> u32
fn textureNumLevels(t: texture_depth_2d_array) -> u32
fn textureNumLevels(t: texture_depth_cube) -> u32
fn textureNumLevels(t: texture_depth_cube_array) -> u32

Parameters
 * t The depth array texture.
`
  )
  .params(u =>
    u
      .combine('texture_type', [
        'texture_depth_2d',
        'texture_depth_2d_array',
        'texture_depth_cube',
        'texture_depth_cube_array',
      ] as const)
      .combine('view_type', ['full', 'partial'] as const)
      .beginSubcases()
      .combine('stage', kShaderStages)
  )
  .fn(t => {
    const { stage, texture_type, view_type } = t.params;
    t.skipIfTextureViewDimensionNotSupported(kTextureTypeToViewDimension[t.params.texture_type]);

    const viewDimension = kTextureTypeToViewDimension[texture_type];
    const dimension = getTextureDimensionFromView(viewDimension);
    const isCube = texture_type.includes('cube');
    const width = 64;
    const height = dimension === '1d' ? 1 : width;
    const depthOrArrayLayers = isCube ? 6 : 1;
    const mipCount = dimension === '1d' ? 1 : 4;
    const texture = t.createTextureTracked({
      format: 'depth32float',
      dimension,
      ...(t.isCompatibility && { textureBindingViewDimension: viewDimension }),
      usage: GPUTextureUsage.TEXTURE_BINDING,
      size: {
        width,
        height,
        depthOrArrayLayers,
      },
      mipLevelCount: mipCount,
    });

    const code = `
@group(0) @binding(0) var t: ${texture_type};
@group(0) @binding(1) var<storage, read_write> result: u32;
fn getValue() -> u32 {
  return textureNumLevels(t);
}
    `;

    const { baseMipLevel, mipLevelCount, expected } = getLevelSettingsAndExpected(
      view_type,
      mipCount
    );
    const viewDescription = {
      dimension: viewDimension,
      baseMipLevel,
      mipLevelCount,
    };

    executeTextureQueryAndExpectResult(t, stage, code, texture, viewDescription, expected);
  });