napi_glGetShaderiv.cc

napi_value napi_glGetShaderiv(napi_env env, napi_callback_info info) {
    GET_NAPI_PARAMS_INFO(3, "getShaderiv(shader: number, pname: number, length: number): Int32Array");
    GET_NAPI_PARAM_UINT32(shader, 0);
    GET_NAPI_PARAM_UINT32(pname, 1);
    GET_NAPI_PARAM_UINT32(length, 2);

    // declare & alloc
    napi_value output_buffer;
    void* paramsPointer = NULL;
    NAPI_CALL(env, napi_create_arraybuffer(env, length * sizeof(GLint), &paramsPointer, &output_buffer));
    GLint* params = (GLint*)(paramsPointer);

    // call
    glGetShaderiv(shader, pname, params);

    // return
    napi_value output_array;
    NAPI_CALL(env, napi_create_typedarray(env, napi_int32_array, length, output_buffer, 0, &output_array));
    return output_array;
}

check napi_create_external_arraybuffer

void finalizerFree(napi_env env, void* finalize_data, void* arr){
    free(arr);
}

napi_value napi_glGetShaderiv(napi_env env, napi_callback_info info) {
    GET_NAPI_PARAMS_INFO(3, "getShaderiv(shader: number, pname: number, length: number): Int32Array");
    GET_NAPI_PARAM_UINT32(shader, 0);
    GET_NAPI_PARAM_UINT32(pname, 1);
    GET_NAPI_PARAM_UINT32(length, 2);

    GLint* params = (GLint *)malloc(length * sizeof(GLint));
    NAPI_ASSERT(env, params != NULL, "couldn't allocate memory");

    glGetShaderiv(shader, pname, params);

    napi_value output_buffer;
    NAPI_CALL(env, napi_create_external_arraybuffer(env, params, length * sizeof(GLint), finalizerFree, params, &output_buffer));


    napi_value output_array;
    NAPI_CALL(env, napi_create_typedarray(env, napi_int32_array, length, output_buffer, 0, &output_array));

    return output_array;
}

void finalizerFree(napi_env env, void* finalize_data, void* arr){
    printf("free %p\n", arr);
    free(arr);
}

napi_value napi_glGetShaderiv(napi_env env, napi_callback_info info) {
    GET_NAPI_PARAMS_INFO(3, "getShaderiv(shader: number, pname: number, length: number): Int32Array");
    GET_NAPI_PARAM_UINT32(shader, 0);
    GET_NAPI_PARAM_UINT32(pname, 1);
    GET_NAPI_PARAM_UINT32(length, 2);

    GLint* params = (GLint *)calloc(length, sizeof(*params));
    NAPI_ASSERT(env, params != NULL, "couldn't allocate memory");

    printf("alloc %p\n", params);

    glGetShaderiv(shader, pname, params);

    napi_value output_buffer;
    NAPI_CALL(env, napi_create_external_arraybuffer(env, params, length * sizeof(GLint), finalizerFree, params, &output_buffer));


    napi_value output_array;
    NAPI_CALL(env, napi_create_typedarray(env, napi_int32_array, length, output_buffer, 0, &output_array));

    return output_array;
}