SceneInternal.h

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#pragma once
 
// Internal helpers shared between scene/Scene.cpp and scene/SceneNodes.cpp.
//
// Extracted verbatim from Scene.cpp when the node methods were split out.
// Anonymous namespace: each translation unit gets its own internal copy,
// exactly like the original single file.
 
#include "scene/SceneHost.h"
 
#include <glm/glm.hpp>
#include <glm/gtc/quaternion.hpp>
 
#include <string>
 
namespace eve::scene {
namespace {
 
int linkKindFromString(const std::string &kind) { return findLinkKind(kind.c_str()); }
 
int syncModeFromString(const std::string &mode) {
    return mode == "body" ? 1 : 0;
}
 
glm::quat nodeQuaternion(const SceneNode &n) {
    return glm::angleAxis(n.yaw, glm::vec3(0.f, 1.f, 0.f)) *
           glm::angleAxis(n.pitch, glm::vec3(1.f, 0.f, 0.f)) *
           glm::angleAxis(n.roll, glm::vec3(0.f, 0.f, 1.f));
}
 
void decomposeWorld(const glm::mat4 &w, glm::vec3 &pos, glm::vec3 &euler,
                    glm::vec3 &scale) {
    pos = glm::vec3(w[3]);
    glm::vec3 c0(w[0]), c1(w[1]), c2(w[2]);
    scale = glm::vec3(glm::length(c0), glm::length(c1), glm::length(c2));
    if (scale.x > 1e-8f) c0 /= scale.x;
    if (scale.y > 1e-8f) c1 /= scale.y;
    if (scale.z > 1e-8f) c2 /= scale.z;
    glm::mat3 rot(c0, c1, c2);
    glm::quat q = glm::quat_cast(rot);
    glm::vec3 e = glm::eulerAngles(q);  // pitch(x), yaw(y), roll(z)
    euler = glm::vec3(e.y, e.x, e.z);
}
 
}  // namespace
}  // namespace eve::scene