// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <cmath>

#include "dawn/tests/unittests/validation/ValidationTest.h"

#include "dawn/utils/WGPUHelpers.h"

namespace {

class SamplerValidationTest : public ValidationTest {};

// Test NaN and INFINITY values are not allowed
TEST_F(SamplerValidationTest, InvalidLOD) {
    { device.CreateSampler(); }
    {
        wgpu::SamplerDescriptor samplerDesc;
        samplerDesc.lodMinClamp = NAN;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc;
        samplerDesc.lodMaxClamp = NAN;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc;
        samplerDesc.lodMaxClamp = INFINITY;
        device.CreateSampler(&samplerDesc);
    }
    {
        wgpu::SamplerDescriptor samplerDesc;
        samplerDesc.lodMaxClamp = INFINITY;
        samplerDesc.lodMinClamp = INFINITY;
        device.CreateSampler(&samplerDesc);
    }
}

TEST_F(SamplerValidationTest, InvalidFilterAnisotropic) {
    wgpu::SamplerDescriptor kValidAnisoSamplerDesc = {};
    kValidAnisoSamplerDesc.maxAnisotropy = 2;
    kValidAnisoSamplerDesc.minFilter = wgpu::FilterMode::Linear;
    kValidAnisoSamplerDesc.magFilter = wgpu::FilterMode::Linear;
    kValidAnisoSamplerDesc.mipmapFilter = wgpu::FilterMode::Linear;
    {
        // when maxAnisotropy > 1, min, mag, mipmap filter should be linear
        device.CreateSampler(&kValidAnisoSamplerDesc);
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.maxAnisotropy = 0;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.minFilter = wgpu::FilterMode::Nearest;
        samplerDesc.magFilter = wgpu::FilterMode::Nearest;
        samplerDesc.mipmapFilter = wgpu::FilterMode::Nearest;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.minFilter = wgpu::FilterMode::Nearest;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.magFilter = wgpu::FilterMode::Nearest;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.mipmapFilter = wgpu::FilterMode::Nearest;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
}

TEST_F(SamplerValidationTest, ValidFilterAnisotropic) {
    wgpu::SamplerDescriptor kValidAnisoSamplerDesc = {};
    kValidAnisoSamplerDesc.maxAnisotropy = 2;
    kValidAnisoSamplerDesc.minFilter = wgpu::FilterMode::Linear;
    kValidAnisoSamplerDesc.magFilter = wgpu::FilterMode::Linear;
    kValidAnisoSamplerDesc.mipmapFilter = wgpu::FilterMode::Linear;
    { device.CreateSampler(); }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.maxAnisotropy = 16;
        device.CreateSampler(&samplerDesc);
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.maxAnisotropy = 32;
        device.CreateSampler(&samplerDesc);
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.maxAnisotropy = 0x7FFF;
        device.CreateSampler(&samplerDesc);
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.maxAnisotropy = 0x8000;
        device.CreateSampler(&samplerDesc);
    }
    {
        wgpu::SamplerDescriptor samplerDesc = kValidAnisoSamplerDesc;
        samplerDesc.maxAnisotropy = 0xFFFF;
        device.CreateSampler(&samplerDesc);
    }
}

}  // anonymous namespace