OpenSpace/modules/base/rendering/renderablecartesianaxes.cpp

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 * OpenSpace                                                                             *
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#include <modules/base/rendering/renderablecartesianaxes.h>

#include <modules/base/basemodule.h>
#include <openspace/engine/globals.h>
#include <openspace/rendering/renderengine.h>
#include <openspace/util/spicemanager.h>
#include <openspace/util/updatestructures.h>
#include <openspace/documentation/verifier.h>
#include <ghoul/glm.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/opengl/openglstatecache.h>
#include <ghoul/opengl/programobject.h>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo XColorInfo = {
        "XColor",
        "X Color",
        "The color of the x-axis.",
        openspace::properties::Property::Visibility::NoviceUser
    };

    constexpr openspace::properties::Property::PropertyInfo YColorInfo = {
        "YColor",
        "Y Color",
        "The color of the y-axis.",
        openspace::properties::Property::Visibility::NoviceUser
    };

    constexpr openspace::properties::Property::PropertyInfo ZColorInfo = {
        "ZColor",
        "Z Color",
        "The color of the z-axis.",
        openspace::properties::Property::Visibility::NoviceUser
    };

    // The RenderableCartesianAxes can be used to render the local Cartesian coordinate
    // system, or reference frame, of another scene graph node. The colors of the axes
    // can be customized but are per default set to Red, Green and Blue, for the X-, Y-
    // and Z-axis, respectively.
    //
    // To add the axes, create a scene graph node with the RenderableCartesianAxes
    // renderable and add it as a child to the other scene graph node, i.e. specify the
    // other node as the Parent of the node with this renderable. Also, the axes have to
    // be scaled to match the parent object for the axes to be visible in the scene, for
    // example using a StaticScale.
    struct [[codegen::Dictionary(RenderableCartesianAxes)]] Parameters {
        // [[codegen::verbatim(XColorInfo.description)]]
        std::optional<glm::vec3> xColor [[codegen::color()]];

        // [[codegen::verbatim(YColorInfo.description)]]
        std::optional<glm::vec3> yColor [[codegen::color()]];

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

namespace openspace {

documentation::Documentation RenderableCartesianAxes::Documentation() {
    return codegen::doc<Parameters>("base_renderable_cartesianaxes");
}

RenderableCartesianAxes::RenderableCartesianAxes(const ghoul::Dictionary& dictionary)
    : Renderable(dictionary)
    , _program(nullptr)
    , _xColor(XColorInfo, glm::vec3(1.f, 0.f, 0.f), glm::vec3(0.f), glm::vec3(1.f))
    , _yColor(YColorInfo, glm::vec3(0.f, 1.f, 0.f), glm::vec3(0.f), glm::vec3(1.f))
    , _zColor(ZColorInfo, glm::vec3(0.f, 0.f, 1.f), glm::vec3(0.f), glm::vec3(1.f))
{
    const Parameters p = codegen::bake<Parameters>(dictionary);
    _xColor = p.xColor.value_or(_xColor);
    _xColor.setViewOption(properties::Property::ViewOptions::Color);
    addProperty(_xColor);

    _yColor = p.yColor.value_or(_yColor);
    _yColor.setViewOption(properties::Property::ViewOptions::Color);
    addProperty(_yColor);

    _zColor = p.zColor.value_or(_zColor);
    _zColor.setViewOption(properties::Property::ViewOptions::Color);
    addProperty(_zColor);
}

bool RenderableCartesianAxes::isReady() const {
    bool ready = true;
    ready &= (_program != nullptr);
    return ready;
}

void RenderableCartesianAxes::initializeGL() {
    _program = BaseModule::ProgramObjectManager.request(
        "CartesianAxesProgram",
        []() -> std::unique_ptr<ghoul::opengl::ProgramObject> {
            return global::renderEngine->buildRenderProgram(
                "CartesianAxesProgram",
                absPath("${MODULE_BASE}/shaders/axes_vs.glsl"),
                absPath("${MODULE_BASE}/shaders/axes_fs.glsl")
            );
        }
    );

    glGenVertexArrays(1, &_vaoId);
    glBindVertexArray(_vaoId);

    std::vector<Vertex> vertices({
        Vertex{0.f, 0.f, 0.f},
        Vertex{1.f, 0.f, 0.f},
        Vertex{0.f, 1.f, 0.f},
        Vertex{0.f, 0.f, 1.f}
    });

    std::vector<int> indices = {
        0, 1,
        0, 2,
        0, 3
    };

    glGenBuffers(1, &_vBufferId);
    glBindBuffer(GL_ARRAY_BUFFER, _vBufferId);
    glBufferData(
        GL_ARRAY_BUFFER,
        vertices.size() * sizeof(Vertex),
        vertices.data(),
        GL_STATIC_DRAW
    );

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), nullptr);

    glGenBuffers(1, &_iBufferId);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _iBufferId);
    glBufferData(
        GL_ELEMENT_ARRAY_BUFFER,
        indices.size() * sizeof(int),
        indices.data(),
        GL_STATIC_DRAW
    );
    glBindVertexArray(0);
}

void RenderableCartesianAxes::deinitializeGL() {
    glDeleteVertexArrays(1, &_vaoId);
    _vaoId = 0;

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

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

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

void RenderableCartesianAxes::render(const RenderData& data, RendererTasks&){
    _program->activate();

    const glm::dmat4 modelViewTransform = calcModelViewTransform(data);

    _program->setUniform("modelViewTransform", glm::mat4(modelViewTransform));
    _program->setUniform("projectionTransform", data.camera.projectionMatrix());

    _program->setUniform("xColor", _xColor);
    _program->setUniform("yColor", _yColor);
    _program->setUniform("zColor", _zColor);

    // Changes GL state:
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glEnablei(GL_BLEND, 0);
    glEnable(GL_LINE_SMOOTH);
    glLineWidth(3.0);

    glBindVertexArray(_vaoId);
    glDrawElements(GL_LINES, 6, GL_UNSIGNED_INT, nullptr);
    glBindVertexArray(0);

    _program->deactivate();

    // Restores GL State
    global::renderEngine->openglStateCache().resetBlendState();
    global::renderEngine->openglStateCache().resetLineState();
}

} // namespace openspace