instance.hpp

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#pragma once
 
#include <queue>
#include <vulkan/vulkan.hpp>
#include <wren/vk/buffer.hpp>
#include <wren/vk/shader.hpp>
#include <wren_math/matrix.hpp>
#include <wren_math/vector.hpp>
 
namespace wren::gui {
 
struct Window {
  std::string name;
  wren::math::vec2f pos;
  wren::math::vec2f size;
 
  // IO
 
  bool hovered = false;
  bool selected = false;
  wren::math::vec2f mouse_offset;
};
 
static const std::size_t MAX_VERTICES = 10000;
static const std::size_t MAX_INDICES = MAX_VERTICES * 10;
 
struct Vertex {
  wren::math::vec2f pos;
  wren::math::Vec4f colour;
};
 
struct UBO {
  wren::math::Mat4f proj;
};
 
struct Inputs {
  wren::math::vec2f mouse_position = {0.0f, 0.0f};
  wren::math::vec2f mouse_position_rel = {0.0f, 0.0f};
  bool left_mouse = false;
 
  // Left mouse down this frame
  bool left_mouse_down = false;
};
 
class Instance {
 public:
  Instance(const std::shared_ptr<vk::Shader>& shader,
           const ::vk::Device& device, const VmaAllocator& allocator,
           const ::vk::CommandPool& command_pool,
           const ::vk::Queue& graphics_queue);
 
  [[nodiscard]] auto shader() const { return shader_; }
 
  void bind(const ::vk::CommandBuffer& cmd);
  void flush(const ::vk::CommandBuffer& cmd);
 
  void resize_viewport(const ::vk::Extent2D& size) { this->output_size = size; }
 
  void Begin();
  void End();
 
  auto BeginWindow(const std::string& name, const wren::math::vec2f& size)
      -> bool;
  void EndWindow();
 
  auto IO() -> Inputs& { return io; }
 
 private:
  void draw_quad(const wren::math::vec2f& pos, const wren::math::vec2f& size,
                 const wren::math::Vec4f& colour);
 
  auto point_in_bounds(const wren::math::vec2f& p, const wren::math::vec2f& pos,
                       const wren::math::vec2f& size) -> bool;
 
  std::shared_ptr<vk::Shader> shader_;
  std::shared_ptr<wren::vk::Buffer> index_buffer;
  std::shared_ptr<wren::vk::Buffer> vertex_buffer;
  std::shared_ptr<vk::Buffer> uniform_buffer;
 
  ::vk::Device device;
  ::vk::Queue graphics_queue;
  ::vk::CommandPool command_pool;
 
  ::vk::Extent2D output_size;
 
  VmaAllocator allocator;
  std::vector<Vertex> vertices;
  std::vector<uint16_t> indices;
 
  std::map<std::string, Window> windows_;
  std::queue<std::string> stack;
 
  Inputs io;
  Inputs previous_io;
};
 
}  // namespace wren::gui