export const description = `
Tests that you can not create a render pipeline with different per target blend state or write mask in compat mode.
`;

import { makeTestGroup } from '../../../../../common/framework/test_group.js';
import { keysOf } from '../../../../../common/util/data_tables.js';
import { CompatibilityTest } from '../../../compatibility_test.js';

export const g = makeTestGroup(CompatibilityTest);

type ThreeColorTargets = [GPUColorTargetState, GPUColorTargetState | null, GPUColorTargetState];

const cases = {
  default(_targets: ThreeColorTargets) {
    return true;
  },
  noBlendTarget0(targets: ThreeColorTargets) {
    delete targets[0].blend;
    return false;
  },
  noBlendTarget1(targets: ThreeColorTargets) {
    delete targets[2].blend;
    return false;
  },
  colorOperation(targets: ThreeColorTargets) {
    targets[2].blend!.color.operation = 'subtract';
    return false;
  },
  colorSrcFactor(targets: ThreeColorTargets) {
    targets[2].blend!.color.srcFactor = 'src-alpha';
    return false;
  },
  colorDstFactor(targets: ThreeColorTargets) {
    targets[2].blend!.color.dstFactor = 'dst-alpha';
    return false;
  },
  alphaOperation(targets: ThreeColorTargets) {
    targets[2].blend!.alpha.operation = 'subtract';
    return false;
  },
  alphaSrcFactor(targets: ThreeColorTargets) {
    targets[2].blend!.alpha.srcFactor = 'src-alpha';
    return false;
  },
  alphaDstFactor(targets: ThreeColorTargets) {
    targets[2].blend!.alpha.dstFactor = 'dst-alpha';
    return false;
  },
  writeMask(targets: ThreeColorTargets) {
    targets[2].writeMask = GPUColorWrite.GREEN;
    return false;
  },
};
const caseNames = keysOf(cases);

g.test('colorState')
  .desc(
    `
Tests that you can not create a render pipeline with different per target blend state or write mask in compat mode.

- Test no blend state vs some blend state
- Test different operation, srcFactor, dstFactor for color and alpha
- Test different writeMask
    `
  )
  .params(u => u.combine('caseName', caseNames))
  .fn(t => {
    const { caseName } = t.params;

    const module = t.device.createShaderModule({
      code: `
        @vertex fn vs() -> @builtin(position) vec4f {
            return vec4f(0);
        }

        struct FragmentOut {
            @location(0) fragColor0 : vec4f,
            @location(1) fragColor1 : vec4f,
            @location(2) fragColor2 : vec4f,
        }

        @fragment fn fs() -> FragmentOut {
            var output : FragmentOut;
            output.fragColor0 = vec4f(0);
            output.fragColor1 = vec4f(0);
            output.fragColor2 = vec4f(0);
            return output;
        }
      `,
    });

    const targets: ThreeColorTargets = [
      {
        format: 'rgba8unorm',
        blend: {
          color: {},
          alpha: {},
        },
      },
      null,
      {
        format: 'rgba8unorm',
        blend: {
          color: {},
          alpha: {},
        },
      },
    ];

    const pipelineDescriptor: GPURenderPipelineDescriptor = {
      layout: 'auto',
      vertex: {
        module,
        entryPoint: 'vs',
      },
      fragment: {
        module,
        entryPoint: 'fs',
        targets,
      },
    };
    const isValid = cases[caseName](targets);
    t.expectGPUError(
      'validation',
      () => t.device.createRenderPipeline(pipelineDescriptor),
      !isValid
    );
  });
