magnum/src/Magnum/MaterialTools/Test/PhongToPbrMetallicRoughnessTest.cpp

/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021, 2022 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
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    the rights to use, copy, modify, merge, publish, distribute, sublicense,
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    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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*/

#include <sstream>
#include <Corrade/TestSuite/Tester.h>
#include <Corrade/Utility/DebugStl.h> /** @todo remove once Debug is stream-free */

#include "Magnum/DebugTools/CompareMaterial.h"
#include "Magnum/MaterialTools/PhongToPbrMetallicRoughness.h"
#include "Magnum/Math/Color.h"
#include "Magnum/Math/Matrix3.h"
#include "Magnum/Trade/MaterialData.h"

namespace Magnum { namespace MaterialTools { namespace Test { namespace {

struct PhongToPbrMetallicRoughnessTest: TestSuite::Tester {
    explicit PhongToPbrMetallicRoughnessTest();

    void convert();
    void warning();
    void fail();
};

using namespace Math::Literals;

const struct {
    const char* name;
    PhongToPbrMetallicRoughnessFlags flags;
    Trade::MaterialData material;
    Trade::MaterialData expected;
} ConvertData[]{
    {"empty with no type", {},
        Trade::MaterialData{{}, {}},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {}}},
    {"empty with Phong and other types", {},
        Trade::MaterialData{Trade::MaterialType::Phong|Trade::MaterialType::PbrClearCoat, {}},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness|Trade::MaterialType::PbrClearCoat, {}}},
    {"diffuse color", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366ff_rgbaf}
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366ff_rgbaf}
        }}},
    {"diffuse texture + matrix", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseTexture, 5u},
            {Trade::MaterialAttribute::DiffuseTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColorTexture, 5u},
            {Trade::MaterialAttribute::BaseColorTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
        }}},
    {"diffuse color + texture + coordinates + layer", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::DiffuseTexture, 7u},
            {Trade::MaterialAttribute::DiffuseTextureCoordinates, 2u},
            {Trade::MaterialAttribute::DiffuseTextureLayer, 155u},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::BaseColorTexture, 7u},
            {Trade::MaterialAttribute::BaseColorTextureCoordinates, 2u},
            {Trade::MaterialAttribute::BaseColorTextureLayer, 155u},
        }}},
    {"both diffuse and base color", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366ff_rgbaf},
            {Trade::MaterialAttribute::BaseColor, 0x3366ffff_rgbaf}
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            /* It's not overwritten as it's assumed to be more correct */
            {Trade::MaterialAttribute::BaseColor, 0x3366ffff_rgbaf}
        }}},
    {"both diffuse and base color texture but different texture properties", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseTexture, 8u},
            {Trade::MaterialAttribute::DiffuseTextureLayer, 12u},
            {Trade::MaterialAttribute::DiffuseTextureMatrix, Matrix3{}},
            {Trade::MaterialAttribute::BaseColorTexture, 11u},
            {Trade::MaterialAttribute::BaseColorTextureCoordinates, 1u},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            /* It's not overwritten as it's assumed to be more correct;
               texture-related attributes are not mixed together */
            {Trade::MaterialAttribute::BaseColorTexture, 11u},
            {Trade::MaterialAttribute::BaseColorTextureCoordinates, 1u},
        }}},
    {"keep original attributes", PhongToPbrMetallicRoughnessFlag::KeepOriginalAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::DiffuseTexture, 7u},
            {Trade::MaterialAttribute::DiffuseTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::DiffuseTextureCoordinates, 2u},
            {Trade::MaterialAttribute::DiffuseTextureLayer, 155u},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::BaseColorTexture, 7u},
            {Trade::MaterialAttribute::BaseColorTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::BaseColorTextureCoordinates, 2u},
            {Trade::MaterialAttribute::BaseColorTextureLayer, 155u},
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::DiffuseTexture, 7u},
            {Trade::MaterialAttribute::DiffuseTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::DiffuseTextureCoordinates, 2u},
            {Trade::MaterialAttribute::DiffuseTextureLayer, 155u},
        }}},
    {"extra attributes and layers", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366ff_rgbaf},
            {Trade::MaterialAttribute::AlphaMask, 0.7f},
            {Trade::MaterialAttribute::DiffuseTexture, 7u},
            {Trade::MaterialLayer::ClearCoat},
            {Trade::MaterialAttribute::LayerFactor, 0.35f},
        }, {2, 3, 5}},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366ff_rgbaf},
            {Trade::MaterialAttribute::AlphaMask, 0.7f},
            /* Shouldn't get converted because it's a different layer */
            {Trade::MaterialAttribute::DiffuseTexture, 7u},
            {Trade::MaterialLayer::ClearCoat},
            {Trade::MaterialAttribute::LayerFactor, 0.35f},
        }, {2, 3, 5}}},
    {"extra attributes and layers, keep original attributes", PhongToPbrMetallicRoughnessFlag::KeepOriginalAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366ff_rgbaf},
            {Trade::MaterialAttribute::DiffuseTexture, 0u},
            {Trade::MaterialAttribute::AlphaMask, 0.7f},
            {Trade::MaterialLayer::ClearCoat},
            {Trade::MaterialAttribute::LayerFactor, 0.35f},
        }, {2, 4}},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366ff_rgbaf},
            {Trade::MaterialAttribute::BaseColorTexture, 0u},
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366ff_rgbaf},
            {Trade::MaterialAttribute::DiffuseTexture, 0u},
            {Trade::MaterialAttribute::AlphaMask, 0.7f},
            {Trade::MaterialLayer::ClearCoat},
            {Trade::MaterialAttribute::LayerFactor, 0.35f},
        }, {4, 6}}},
    {"diffuse texture properties without texture", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::DiffuseTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::DiffuseTextureCoordinates, 2u},
            {Trade::MaterialAttribute::DiffuseTextureLayer, 155u},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366cc_rgbaf},
            /* Those are kept and don't produce any warning because the
               texture wasn't found and thus the branch wasn't taken */
            {Trade::MaterialAttribute::DiffuseTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::DiffuseTextureCoordinates, 2u},
            {Trade::MaterialAttribute::DiffuseTextureLayer, 155u},
        }}},
    {"ambient texture properties without texture, fail on unconvertable", PhongToPbrMetallicRoughnessFlag::FailOnUnconvertableAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::AmbientTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::AmbientTextureLayer, 356u},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366cc_rgbaf},
            /* These are kept and don't produce any failure because the
               texture wasn't found and thus the branch wasn't taken */
            {Trade::MaterialAttribute::AmbientTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::AmbientTextureLayer, 356u},
        }}},
};

const struct {
    const char* name;
    PhongToPbrMetallicRoughnessFlags flags;
    Trade::MaterialData material;
    Trade::MaterialData expected;
    const char* message;
} WarningData[]{
    {"ambient color, specular texture + coordinates", {},
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::AmbientColor, 0x0f030600_rgbaf},
            {Trade::MaterialAttribute::SpecularTexture, 3u},
            {Trade::MaterialAttribute::SpecularTextureCoordinates, 2u},
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::AmbientColor, 0x0f030600_rgbaf},
            {Trade::MaterialAttribute::SpecularTexture, 3u},
            {Trade::MaterialAttribute::SpecularTextureCoordinates, 2u},
        }},
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::AmbientColor attribute, skipping\n"
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::SpecularTexture attribute, skipping\n"},
    {"specular color, texture + matrix + layer, ambient texture + coordinates; drop unconvertable", PhongToPbrMetallicRoughnessFlag::DropUnconvertableAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::DiffuseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::SpecularColor, 0x3366ffff_rgbaf},
            {Trade::MaterialAttribute::SpecularTexture, 3u},
            {Trade::MaterialAttribute::SpecularTextureMatrix, Matrix3::scaling(Vector2{0.5f})},
            {Trade::MaterialAttribute::SpecularTextureLayer, 156u},
            {Trade::MaterialAttribute::AmbientTexture, 1u},
            {Trade::MaterialAttribute::AmbientTextureCoordinates, 2u},
            {Trade::MaterialAttribute::DoubleSided, true}
        }},
        Trade::MaterialData{Trade::MaterialType::PbrMetallicRoughness, {
            {Trade::MaterialAttribute::BaseColor, 0xff3366cc_rgbaf},
            {Trade::MaterialAttribute::DoubleSided, true}
        }},
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::SpecularColor attribute, skipping\n"
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::AmbientTexture attribute, skipping\n"
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::SpecularTexture attribute, skipping\n"},
};

const struct {
    const char* name;
    PhongToPbrMetallicRoughnessFlags flags;
    Trade::MaterialData material;
    const char* message;
} FailData[]{
    {"ambient color, fail on unconvertable", PhongToPbrMetallicRoughnessFlag::FailOnUnconvertableAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::AmbientColor, Color4{}},
        }},
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::AmbientColor attribute\n"},
    {"specular texture, fail on unconvertable", PhongToPbrMetallicRoughnessFlag::FailOnUnconvertableAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::SpecularTexture, 0u},
        }},
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::SpecularTexture attribute\n"},
    {"shininess, fail on unconvertable", PhongToPbrMetallicRoughnessFlag::FailOnUnconvertableAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::Shininess, 0.5f},
        }},
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::Shininess attribute\n"},
    {"specular color, both drop & fail on unconvertable", PhongToPbrMetallicRoughnessFlag::FailOnUnconvertableAttributes|PhongToPbrMetallicRoughnessFlag::DropUnconvertableAttributes,
        Trade::MaterialData{{}, {
            {Trade::MaterialAttribute::SpecularTexture, 0u},
        }},
        "MaterialTools::phongToPbrMetallicRoughness(): unconvertable Trade::MaterialAttribute::SpecularTexture attribute\n"},
};

PhongToPbrMetallicRoughnessTest::PhongToPbrMetallicRoughnessTest() {
    addInstancedTests({&PhongToPbrMetallicRoughnessTest::convert},
        Containers::arraySize(ConvertData));

    addInstancedTests({&PhongToPbrMetallicRoughnessTest::warning},
        Containers::arraySize(WarningData));

    addInstancedTests({&PhongToPbrMetallicRoughnessTest::fail},
        Containers::arraySize(FailData));
}

void PhongToPbrMetallicRoughnessTest::convert() {
    auto&& data = ConvertData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    std::ostringstream out;
    Error redirectError{&out};
    Warning redirectWarning{&out};
    Containers::Optional<Trade::MaterialData> actual = phongToPbrMetallicRoughness(data.material, data.flags);
    CORRADE_VERIFY(actual);
    CORRADE_COMPARE_AS(*actual, data.expected, DebugTools::CompareMaterial);
    CORRADE_COMPARE(out.str(), "");
}

void PhongToPbrMetallicRoughnessTest::warning() {
    auto&& data = WarningData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    std::ostringstream out;
    Warning redirectWarning{&out};
    Containers::Optional<Trade::MaterialData> actual = phongToPbrMetallicRoughness(data.material, data.flags);
    CORRADE_VERIFY(actual);
    CORRADE_COMPARE_AS(*actual, data.expected, DebugTools::CompareMaterial);
    CORRADE_COMPARE(out.str(), data.message);
}

void PhongToPbrMetallicRoughnessTest::fail() {
    auto&& data = FailData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    std::ostringstream out;
    Error redirectError{&out};
    CORRADE_VERIFY(!phongToPbrMetallicRoughness(data.material, data.flags));
    CORRADE_COMPARE(out.str(), data.message);
}

}}}}

CORRADE_TEST_MAIN(Magnum::MaterialTools::Test::PhongToPbrMetallicRoughnessTest)