// Copyright 2019 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
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// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
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#include <cmath>

#include "src/dawn/tests/unittests/validation/ValidationTest.h"
#include "src/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;
        ASSERT_DEVICE_ERROR(device.CreateSampler(&samplerDesc));
    }
    {
        wgpu::SamplerDescriptor samplerDesc;
        samplerDesc.lodMaxClamp = INFINITY;
        samplerDesc.lodMinClamp = INFINITY;
        ASSERT_DEVICE_ERROR(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::MipmapFilterMode::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::MipmapFilterMode::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::MipmapFilterMode::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::MipmapFilterMode::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);
    }
}

TEST_F(SamplerValidationTest, ValidFilterAnisotropicWithUndefined) {
    wgpu::SamplerDescriptor kValidAnisoSamplerDesc = {};
    kValidAnisoSamplerDesc.maxAnisotropy = 2;
    kValidAnisoSamplerDesc.minFilter = wgpu::FilterMode::Undefined;
    kValidAnisoSamplerDesc.magFilter = wgpu::FilterMode::Undefined;
    kValidAnisoSamplerDesc.mipmapFilter = wgpu::MipmapFilterMode::Undefined;
    {
        device.CreateSampler();
    }
}

}  // anonymous namespace