Struct Pointer

[cemalgnlts]

Hi,

The library I use defines a struct like this:

typedef struct Camera3D {
    Vector3 position;
    Vector3 target;
    Vector3 up;
    float fovy;
    int projection;
} Camera3D;

typedef struct Vector3 {
    float x;
    float y;
    float z;
} Vector3;

Creating pointers for Vector3 was easy:

// Vector3 works as intended:
function Vector3(x, y, z) {
  const arr = new Float32Array([x, y, z]);
  
  const pointer = memoryApi.stackAlloc(arr.byteLength);
  memoryApi.writeArrayToMemory(arr, pointer);
  
  return pointer;
}

But Camera3D doesn't work the way I want it to. I'm probably using it wrong:

function Camera3D() {
  const pos = Vector3(0, 10, 0);
  const target = Vector3(0, 0, 0);
  const up = Vector3(0, 1, 0);
  const fovy = 45.0;
  const projection = 0;
  
  const arr = new Float32Array([pos, target, up, fovy, projection]);
    
  const pointer = memoryApi.stackAlloc(arr.byteLength);
  memoryApi.writeArrayToMemory(arr, pointer);
  
  return pointer;
}

I'm not sure how it should be for Camera3D.

[cemalgnlts]

This is how I was able to build a structure:

function Vector3(x, y, z, ptr) {
  memoryApi.setValue(ptr, x, "float");
  memoryApi.setValue(ptr + 4, y, "float");
  memoryApi.setValue(ptr + 8, z, "float");
}

function Camera3D() {
  const camPtr = memoryApi.stackAlloc(44);

  const fovy = 45.0;
  const projection = 0;

  const position = Vector3(0, 10, 10, camPtr);
  const target = Vector3(0, 0, 0, camPtr + 12);
  const up = Vector3(0, 1, 0, camPtr + 24);

  memoryApi.setValue(camPtr + 36, fovy, "float");
  memoryApi.setValue(camPtr + 40, projection, "i32");
  
  return camPtr;
}

I'm not sure if this is the best way. I also don't know why writeArrayToMemory doesn't work:

function Vector3(x, y, z, ptr) {
  const arr = new Float32Array([x, y, z]);
  memoryApi.writeArrayToMemory(arr, ptr);
}