module;

#include <cstdint>
#include <vulkan/vulkan.h>
#include <cstring>
#include <iostream>
#include <cmath>

export module Crafter.Graphics:MeshShader;
import Crafter.Component;
import :Mesh;
import :Camera;
import :VulkanPipeline;
import Crafter.Math;

namespace Crafter {
    export template <typename VertexType>
    class MeshShader : public Component {
    public:
        MatrixRowMajor<float, 4, 4, 1> transform;
        ComponentRefOwning<Mesh<VertexType>> mesh;
        ComponentRefOwning<Camera> camera;
        Buffer<MatrixRowMajor<float, 4, 4, 1>> mvp;
        std::uint32_t threadCount;
        EventListener<void> cameraUpdate;
        MeshShader(Mesh<VertexType>* mesh, Camera* camera) : threadCount(std::ceil(static_cast<double>(mesh->indexCount)/64/3)), mvp(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT), mesh(mesh), camera(camera), cameraUpdate(
            &camera->onUpdate, [this](){
                Update();
            }
        ) {
            transform = MatrixRowMajor<float, 4, 4, 1>::Identity();
        }
        void WriteDescriptors(DescriptorSet& set) {
            set.Write(0, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &mvp.descriptor);
            set.Write(0, VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 1, &mesh.component->verticies.descriptor);
            set.Write(0, VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 2, &mesh.component->indicies.descriptor);
        }
        void Update() {
            *mvp.value = camera.component->projectionView*transform;
        }
    };
}