compat.glm

// Behavioral test — compat.glm delivers a real glm, not an empty include root.
//
// The criterion is arithmetic, not compilation: a wrong include root fails to
// compile, but a header set that resolved to the wrong thing would still need
// to produce these numbers. Every value below is fixed by linear algebra or by
// glm's documented conventions.
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtx/norm.hpp>

import std;

int main() {
    // Cross product, right-handed: x cross y is z.
    const glm::vec3 x{1.0f, 0.0f, 0.0f};
    const glm::vec3 y{0.0f, 1.0f, 0.0f};
    if (glm::cross(x, y) != glm::vec3(0.0f, 0.0f, 1.0f)) {
        std::println("cross(x, y) is not z");
        return 1;
    }

    // Column-major storage is part of glm's ABI, and it is what a consumer
// …