OpenSpace/modules/base/rendering/renderableplane.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2021                                                               *
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#include <modules/base/rendering/renderableplane.h>

#include <modules/base/basemodule.h>
#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/engine/globals.h>
#include <openspace/rendering/renderengine.h>
#include <openspace/scene/scenegraphnode.h>
#include <openspace/util/updatestructures.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/misc/defer.h>
#include <ghoul/misc/profiling.h>
#include <ghoul/opengl/programobject.h>
#include <ghoul/opengl/texture.h>
#include <ghoul/opengl/textureunit.h>
#include <ghoul/glm.h>
#include <glm/gtx/string_cast.hpp>
#include <optional>

namespace {
    constexpr const char* ProgramName = "Plane";

    enum class BlendMode {
        Normal = 0,
        Additive
    };

    constexpr openspace::properties::Property::PropertyInfo BillboardInfo = {
        "Billboard",
        "Billboard mode",
        "This value specifies whether the plane is a billboard, which means that it is "
        "always facing the camera. If this is false, it can be oriented using other "
        "transformations."
    };

    constexpr openspace::properties::Property::PropertyInfo MirrorBacksideInfo = {
        "MirrorBackside",
        "Mirror backside of image plane",
        "If this value is set to false, the image plane will not be mirrored when "
        "looking from the backside. This is usually desirable when the image shows "
        "data at a specific location, but not if it is desplaying text for example."
    };

    constexpr openspace::properties::Property::PropertyInfo SizeInfo = {
        "Size",
        "Size (in meters)",
        "This value specifies the size of the plane in meters."
    };

    constexpr openspace::properties::Property::PropertyInfo BlendModeInfo = {
        "BlendMode",
        "Blending Mode",
        "This determines the blending mode that is applied to this plane."
    };

    constexpr openspace::properties::Property::PropertyInfo MultiplyColorInfo = {
        "MultiplyColor",
        "Multiply Color",
        "If set, the plane's texture is multiplied with this color. "
        "Useful for applying a color grayscale images."
    };

    struct [[codegen::Dictionary(RenderablePlane)]] Parameters {
        // [[codegen::verbatim(BillboardInfo.description)]]
        std::optional<bool> billboard;

        // [[codegen::verbatim(MirrorBacksideInfo.description)]]
        std::optional<bool> mirrorBackside;

        // [[codegen::verbatim(SizeInfo.description)]]
        float size;

        enum class BlendMode {
            Normal,
            Additive
        };
        // [[codegen::verbatim(BlendModeInfo.description)]]
        std::optional<BlendMode> blendMode;

        // [[codegen::verbatim(MultiplyColorInfo.description)]]
        std::optional<glm::vec3> multiplyColor [[codegen::color()]];
    };
#include "renderableplane_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation RenderablePlane::Documentation() {
    return codegen::doc<Parameters>("base_renderable_plane");
}

RenderablePlane::RenderablePlane(const ghoul::Dictionary& dictionary)
    : Renderable(dictionary)
    , _blendMode(BlendModeInfo, properties::OptionProperty::DisplayType::Dropdown)
    , _billboard(BillboardInfo, false)
    , _mirrorBackside(MirrorBacksideInfo, false)
    , _size(SizeInfo, 10.f, 0.f, 1e25f)
    , _multiplyColor(MultiplyColorInfo, glm::vec3(1.f), glm::vec3(0.f), glm::vec3(1.f))
{
    Parameters p = codegen::bake<Parameters>(dictionary);

    addProperty(_opacity);
    registerUpdateRenderBinFromOpacity();

    _size = p.size;
    _billboard = p.billboard.value_or(_billboard);
    _mirrorBackside = p.mirrorBackside.value_or(_mirrorBackside);

    _blendMode.addOptions({
        { static_cast<int>(BlendMode::Normal), "Normal" },
        { static_cast<int>(BlendMode::Additive), "Additive"}
    });
    _blendMode.onChange([&]() {
        switch (_blendMode) {
            case static_cast<int>(BlendMode::Normal):
                setRenderBinFromOpacity();
                break;
            case static_cast<int>(BlendMode::Additive):
                setRenderBin(Renderable::RenderBin::PreDeferredTransparent);
                break;
            default:
                throw ghoul::MissingCaseException();
        }
    });

    _opacity.onChange([&]() {
        if (_blendMode == static_cast<int>(BlendMode::Normal)) {
            setRenderBinFromOpacity();
        }
    });

    if (p.blendMode.has_value()) {
        if (*p.blendMode == Parameters::BlendMode::Normal) {
            _blendMode = static_cast<int>(BlendMode::Normal);
        }
        else if (*p.blendMode == Parameters::BlendMode::Additive) {
            _blendMode = static_cast<int>(BlendMode::Additive);
        }
    }

    _multiplyColor = p.multiplyColor.value_or(_multiplyColor);
    _multiplyColor.setViewOption(properties::Property::ViewOptions::Color);

    addProperty(_billboard);

    _size.setExponent(15.f);
    addProperty(_size);
    _size.onChange([this](){ _planeIsDirty = true; });

    addProperty(_multiplyColor);

    setBoundingSphere(_size);
}

bool RenderablePlane::isReady() const {
    return _shader != nullptr;
}

void RenderablePlane::initializeGL() {
    ZoneScoped

    glGenVertexArrays(1, &_quad); // generate array
    glGenBuffers(1, &_vertexPositionBuffer); // generate buffer
    createPlane();

    _shader = BaseModule::ProgramObjectManager.request(
        ProgramName,
        []() -> std::unique_ptr<ghoul::opengl::ProgramObject> {
            return global::renderEngine->buildRenderProgram(
                ProgramName,
                absPath("${MODULE_BASE}/shaders/plane_vs.glsl"),
                absPath("${MODULE_BASE}/shaders/plane_fs.glsl")
            );
        }
    );
}

void RenderablePlane::deinitializeGL() {
    ZoneScoped

    glDeleteVertexArrays(1, &_quad);
    _quad = 0;

    glDeleteBuffers(1, &_vertexPositionBuffer);
    _vertexPositionBuffer = 0;

    BaseModule::ProgramObjectManager.release(
        ProgramName,
        [](ghoul::opengl::ProgramObject* p) {
            global::renderEngine->removeRenderProgram(p);
        }
    );
    _shader = nullptr;
}

void RenderablePlane::render(const RenderData& data, RendererTasks&) {
    ZoneScoped

    _shader->activate();
    _shader->setUniform("opacity", _opacity);

    _shader->setUniform("mirrorBackside", _mirrorBackside);

    glm::dvec3 objectPositionWorld = glm::dvec3(
        glm::translate(
            glm::dmat4(1.0),
            data.modelTransform.translation) * glm::dvec4(0.0, 0.0, 0.0, 1.0)
    );

    glm::dvec3 normal = glm::normalize(data.camera.positionVec3() - objectPositionWorld);
    glm::dvec3 newRight = glm::normalize(
        glm::cross(data.camera.lookUpVectorWorldSpace(), normal)
    );
    glm::dvec3 newUp = glm::cross(normal, newRight);

    glm::dmat4 cameraOrientedRotation = glm::dmat4(1.0);
    cameraOrientedRotation[0] = glm::dvec4(newRight, 0.0);
    cameraOrientedRotation[1] = glm::dvec4(newUp, 0.0);
    cameraOrientedRotation[2] = glm::dvec4(normal, 0.0);

    const glm::dmat4 rotationTransform = _billboard ?
        cameraOrientedRotation :
        glm::dmat4(data.modelTransform.rotation);

    const glm::dmat4 modelTransform =
        glm::translate(glm::dmat4(1.0), data.modelTransform.translation) *
        rotationTransform *
        glm::scale(glm::dmat4(1.0), glm::dvec3(data.modelTransform.scale)) *
        glm::dmat4(1.0);
    const glm::dmat4 modelViewTransform =
        data.camera.combinedViewMatrix() * modelTransform;

    _shader->setUniform("modelViewProjectionTransform",
        data.camera.projectionMatrix() * glm::mat4(modelViewTransform));

    _shader->setUniform("modelViewTransform",
        glm::mat4(data.camera.combinedViewMatrix() * glm::dmat4(modelViewTransform)));

    ghoul::opengl::TextureUnit unit;
    unit.activate();
    bindTexture();
    defer { unbindTexture(); };

    _shader->setUniform("texture1", unit);

    _shader->setUniform("multiplyColor", _multiplyColor);

    bool usingFramebufferRenderer = global::renderEngine->rendererImplementation() ==
                                    RenderEngine::RendererImplementation::Framebuffer;

    bool usingABufferRenderer = global::renderEngine->rendererImplementation() ==
                                RenderEngine::RendererImplementation::ABuffer;

    if (usingABufferRenderer) {
        _shader->setUniform(
            "additiveBlending",
            _blendMode == static_cast<int>(BlendMode::Additive)
        );
    }

    bool additiveBlending =
        (_blendMode == static_cast<int>(BlendMode::Additive)) && usingFramebufferRenderer;
    if (additiveBlending) {
        glDepthMask(false);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE);
    }

    glBindVertexArray(_quad);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    glBindVertexArray(0);

    if (additiveBlending) {
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        glDepthMask(true);
    }

    _shader->deactivate();
}

void RenderablePlane::bindTexture() {}

void RenderablePlane::unbindTexture() {}

void RenderablePlane::update(const UpdateData&) {
    ZoneScoped

    if (_shader->isDirty()) {
        _shader->rebuildFromFile();
    }

    if (_planeIsDirty) {
        createPlane();
    }
}

void RenderablePlane::createPlane() {
    const GLfloat size = _size;
    const GLfloat vertexData[] = {
        //      x      y     z     w     s     t
        -size, -size, 0.f, 0.f, 0.f, 0.f,
        size, size, 0.f, 0.f, 1.f, 1.f,
        -size, size, 0.f, 0.f, 0.f, 1.f,
        -size, -size, 0.f, 0.f, 0.f, 0.f,
        size, -size, 0.f, 0.f, 1.f, 0.f,
        size, size, 0.f, 0.f, 1.f, 1.f,
    };

    glBindVertexArray(_quad);
    glBindBuffer(GL_ARRAY_BUFFER, _vertexPositionBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 6, nullptr);

    glEnableVertexAttribArray(1);
    glVertexAttribPointer(
        1,
        2,
        GL_FLOAT,
        GL_FALSE,
        sizeof(GLfloat) * 6,
        reinterpret_cast<void*>(sizeof(GLfloat) * 4)
    );
    glBindVertexArray(0);
}

} // namespace openspace