JS関数から構造体をかえしてみる

ReturnStructureFromJS.cpp

# include <stdio.h>
# include <emscripten.h>

struct vec2
{
    float x, y;
};

extern "C"
{
    extern vec2 makeVec2() EM_IMPORT(makeVec2);

    __attribute__((used, visibility("default")))
    const char* __em_js__makeVec2()
    {
        return "(void* retPtr)<::>{ HEAPF32[(retPtr >> 2)] = 10; HEAPF32[(retPtr >> 2) + 1] = 20; }";
    }
}

int main()
{
    auto v = makeVec2();
    printf("%f, %f\n", v.x, v.y);
}