OpenSpace/modules/toyvolume/rendering/toyvolumeraycaster.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2025                                                               *
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#include <modules/toyvolume/rendering/toyvolumeraycaster.h>

#include <openspace/rendering/renderable.h>
#include <openspace/util/blockplaneintersectiongeometry.h>
#include <openspace/util/updatestructures.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/glm.h>
#include <ghoul/opengl/ghoul_gl.h>
#include <ghoul/opengl/programobject.h>
#include <sstream>
#include <vector>

namespace {
    constexpr std::string_view GlslRaycastPath =
        "${MODULE_TOYVOLUME}/shaders/raycast.glsl";
    constexpr std::string_view GlslBoundsVsPath =
        "${MODULE_TOYVOLUME}/shaders/bounds_vs.glsl";
    constexpr std::string_view GlslBoundsFsPath =
        "${MODULE_TOYVOLUME}/shaders/bounds_fs.glsl";
} // namespace

namespace openspace {

ToyVolumeRaycaster::ToyVolumeRaycaster(glm::vec4 color)
    : _boundingBox(glm::vec3(1.f))
    , _color(std::move(color))
{}

void ToyVolumeRaycaster::initialize() {
    _boundingBox.initialize();
}

void ToyVolumeRaycaster::deinitialize() {}

void ToyVolumeRaycaster::renderEntryPoints(const RenderData& data,
                                           ghoul::opengl::ProgramObject& program)
{
    program.setUniform("modelViewTransform", glm::mat4(modelViewTransform(data)));
    program.setUniform("projectionTransform", data.camera.projectionMatrix());

    // Cull back face
    glEnable(GL_CULL_FACE);
    glCullFace(GL_BACK);

    // Render bounding geometry
    _boundingBox.render();
}

void ToyVolumeRaycaster::renderExitPoints(const RenderData& data,
                                          ghoul::opengl::ProgramObject& program)
{
    // Uniforms
    program.setUniform("modelViewTransform", glm::mat4(modelViewTransform(data)));
    program.setUniform("projectionTransform", data.camera.projectionMatrix());

    // Cull front face
    glEnable(GL_CULL_FACE);
    glCullFace(GL_FRONT);

    // Render bounding geometry
    _boundingBox.render();

    // Restore defaults
    glCullFace(GL_BACK);
}

glm::dmat4 ToyVolumeRaycaster::modelViewTransform(const RenderData& data) {
    const glm::dmat4 modelTransform =
        glm::translate(glm::dmat4(1.0), data.modelTransform.translation) *
        glm::dmat4(data.modelTransform.rotation) *
        glm::scale(glm::dmat4(1.0), glm::dvec3(data.modelTransform.scale)) *
        glm::dmat4(_modelTransform);

    return data.camera.combinedViewMatrix() * modelTransform;
}

void ToyVolumeRaycaster::preRaycast(const RaycastData& data,
                                    ghoul::opengl::ProgramObject& program)
{
    program.setUniform(std::format("color{}", data.id), _color);
    program.setUniform(std::format("maxStepSize{}", data.id), _stepSize);
    program.setUniform(
        std::format("time{}", data.id),
        static_cast<float>(std::fmod(_time, 3600.0))
    );
}

void ToyVolumeRaycaster::postRaycast(const RaycastData&, ghoul::opengl::ProgramObject&) {}

bool ToyVolumeRaycaster::isCameraInside(const RenderData& data, glm::vec3& localPosition)
{
    const glm::vec4 modelPos =
        glm::inverse(modelViewTransform(data)) * glm::vec4(0.f, 0.f, 0.f, 1.f);

    localPosition = (glm::vec3(modelPos) + glm::vec3(0.5f));

    return (localPosition.x > 0.f && localPosition.x < 1.f &&
            localPosition.y > 0.f && localPosition.y < 1.f &&
            localPosition.z > 0.f && localPosition.z < 1.f);
}

std::filesystem::path ToyVolumeRaycaster::boundsVertexShaderPath() const {
    return absPath(GlslBoundsVsPath);
}

std::filesystem::path ToyVolumeRaycaster::boundsFragmentShaderPath() const {
    return absPath(GlslBoundsFsPath);
}

std::filesystem::path ToyVolumeRaycaster::raycasterPath() const {
    return absPath(GlslRaycastPath);
}

std::filesystem::path ToyVolumeRaycaster::helperPath() const {
    return ""; // no helper file
}

void ToyVolumeRaycaster::setColor(glm::vec4 color) {
    _color = std::move(color);
}

void ToyVolumeRaycaster::setModelTransform(glm::mat4 transform) {
    _modelTransform = std::move(transform);
}

void ToyVolumeRaycaster::setTime(double time) {
    _time = time;
}

void ToyVolumeRaycaster::setStepSize(float stepSize) {
    _stepSize = stepSize;
}

} // namespace openspace