Method updateUniformBuffer

examples/vulkan/Vulkan.cpp:2385–2445

Update the matrices in our uniform buffer every frame

    // Update the matrices in our uniform buffer every frame
    void updateUniformBuffer(float elapsed)
    {
        // Construct the model matrix
        // clang-format off
        Matrix model = {{
            {1.0f, 0.0f, 0.0f, 0.0f},
            {0.0f, 1.0f, 0.0f, 0.0f},
            {0.0f, 0.0f, 1.0f, 0.0f},
            {0.0f, 0.0f, 0.0f, 1.0f}
        }};
        // clang-format on

        matrixRotateX(model, sf::degrees(elapsed * 59.0f));
        matrixRotateY(model, sf::degrees(elapsed * 83.0f));
        matrixRotateZ(model, sf::degrees(elapsed * 109.0f));

        // Translate the model based on the mouse position
        const sf::Vector2f mousePosition = sf::Vector2f(sf::Mouse::getPosition(window));
        const sf::Vector2f windowSize    = sf::Vector2f(window.getSize());
        const float        x             = std::clamp(mousePosition.x * 2.f / windowSize.x - 1.f, -1.0f, 1.0f) * 2.0f;
        const float        y             = std::clamp(-mousePosition.y * 2.f / windowSize.y + 1.f, -1.0f, 1.0f) * 1.5f;

        model[3][0] -= x;
        model[3][2] += y;

        // Construct the view matrix
        const sf::Vector3f eye(0.0f, 4.0f, 0.0f);
        const sf::Vector3f center(0.0f, 0.0f, 0.0f);
        const sf::Vector3f up(0.0f, 0.0f, 1.0f);

        Matrix view;
        matrixLookAt(view, eye, center, up);

        // Construct the projection matrix
        const sf::Angle fov    = sf::degrees(45);
        const float     aspect = static_cast<float>(swapchainExtent.width) / static_cast<float>(swapchainExtent.height);
        const float     nearPlane = 0.1f;
        const float     farPlane  = 10.0f;

        Matrix projection;

        matrixPerspective(projection, fov, aspect, nearPlane, farPlane);

        char* ptr = nullptr;

        // Map the current frame's uniform buffer into our address space
        if (vkMapMemory(device, uniformBuffersMemory[currentFrame], 0, sizeof(Matrix) * 3, 0, reinterpret_cast<void**>(&ptr)) !=
            VK_SUCCESS)
        {
            vulkanAvailable = false;
            return;
        }

        // Copy the matrix data into the current frame's uniform buffer
        std::memcpy(ptr + sizeof(Matrix) * 0, model.data(), sizeof(Matrix));
        std::memcpy(ptr + sizeof(Matrix) * 1, view.data(), sizeof(Matrix));
        std::memcpy(ptr + sizeof(Matrix) * 2, projection.data(), sizeof(Matrix));