Cubed/src/render/renderer.cpp

#include "Cubed/render/renderer.hpp"

#include "Cubed/camera.hpp"
#include "Cubed/config.hpp"
#include "Cubed/debug_collector.hpp"
#include "Cubed/dev_panel.hpp"
#include "Cubed/gameplay/client_player.hpp"
#include "Cubed/gameplay/client_world.hpp"
#include "Cubed/primitive_data.hpp"
#include "Cubed/render/renderer_constants.hpp"
#include "Cubed/texture_manager.hpp"
#include "Cubed/tools/font.hpp"
#include "Cubed/tools/log.hpp"
#include "Cubed/tools/shader_tools.hpp"

#include <GLFW/glfw3.h>
#include <format>
#include <glm/gtc/type_ptr.hpp>

namespace Cubed {

Renderer::Renderer(const Camera& camera, ClientWorld& world,
                   const TextureManager& texture_manager, DevPanel& dev_panel,
                   Config& config)
    : m_camera(camera), m_dev_panel(dev_panel),
      m_texture_manager(texture_manager), m_world(world),
      m_world_renderer(*this), m_config(config) {}

Renderer::~Renderer() {
    if (m_init) {
        glBindBuffer(GL_ARRAY_BUFFER, 0);
        m_outline_vbo.reset();
        m_outline_indices_vbo.reset();
        m_sky_vbo.reset();
        m_ui_vbo.reset();
        m_player_vbo.reset();
        glBindVertexArray(0);
        m_vao.clear();
    }
}

void Renderer::hot_reload() { update_fov(m_config.get("player.fov", 70.0f)); }

void Renderer::init(bool debug_on) {
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        Logger::error("Failed to initialize glad");
        exit(EXIT_FAILURE);
    }
    Logger::info("OpenGL Version: {}.{}", GLVersion.major, GLVersion.minor);
    Logger::info("Renderer: {}",
                 reinterpret_cast<const char*>(glGetString(GL_RENDERER)));

    m_shaders.init();

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

#ifdef DEBUG_MODE
    if (debug_on) {
        glEnable(GL_DEBUG_OUTPUT);
        glDebugMessageCallback(
            [](GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar* message,
               const void*) {
                Logger::log(Logger::Level::L_DEBUG,
                            std::source_location::current(), "GL Debug: {}",
                            reinterpret_cast<const char*>(message));
            },
            nullptr);
    }

#endif

    m_vao.resize(NUM_VAO);
    VertexArray::unbind();

    m_outline_vbo = std::make_unique<VertexBuffer>();
    m_outline_indices_vbo =
        std::make_unique<VertexBuffer>(BufferType::ELEMENT_ARRAY_BUFFER);
    m_player_vbo = std::make_unique<VertexBuffer>();
    m_quad_vbo = std::make_unique<VertexBuffer>();
    m_sky_vbo = std::make_unique<VertexBuffer>();
    m_ui_vbo = std::make_unique<VertexBuffer>();

    m_vao[2].bind();

    m_outline_vbo->buffer_data(CUBE_VER, sizeof(CUBE_VER));
    m_vao[2].attribute(0, 3, GL_FLOAT, 0, 0);
    m_outline_indices_vbo->buffer_data(OUTLINE_CUBE_INDICES,
                                       sizeof(OUTLINE_CUBE_INDICES));

    m_vao[1].bind();
    m_sky_vbo->buffer_data(VERTICES_POS, sizeof(VERTICES_POS));

    m_vao[1].attribute(0, 3, GL_FLOAT, 0, 0);

    m_vao[3].bind();

    for (int i = 0; i < 6; i++) {
        Vertex2D vex{SQUARE_VERTICES[i][0], SQUARE_VERTICES[i][1],
                     SQUARE_TEXTURE_POS[i][0], SQUARE_TEXTURE_POS[i][1], 0};
        m_ui.emplace_back(vex);
    }
    m_ui_vbo->buffer_data(m_ui.data(), m_ui.size() * sizeof(Vertex2D));

    m_vao[3].attribute(0, 3, GL_FLOAT, sizeof(Vertex2D), (void*)0);
    m_vao[3].attribute(1, 2, GL_FLOAT, sizeof(Vertex2D),
                       (void*)offsetof(Vertex2D, s));
    m_vao[3].attribute(2, 1, GL_FLOAT, sizeof(Vertex2D),
                       (void*)offsetof(Vertex2D, layer));

    init_quad();
    init_text();
    hot_reload();

    m_world_renderer.init();

    VertexArray::unbind();
    VertexBuffer::unbind();
    m_init = true;
}

const Shader& Renderer::get_shader(const std::string& name) const {
    return m_shaders.get_shader(name);
}

void Renderer::init_quad() {
    m_vao[0].bind();
    m_quad_vbo->buffer_data(QUAD_VERTICES, sizeof(QUAD_VERTICES));

    m_vao[0].attribute(0, 2, GL_FLOAT, 4 * sizeof(float), (void*)0);

    m_vao[0].attribute(1, 2, GL_FLOAT, 4 * sizeof(float),
                       (void*)(2 * sizeof(float)));
}

void Renderer::init_text() {
    m_vao[4].bind();

    DebugCollector::get().init_text();
}

void Renderer::render() {
    glDisable(GL_FRAMEBUFFER_SRGB);
    // clear screen
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    m_world_renderer.render();

    render_ui();

    render_text();

    render_dev_panel();
}

void Renderer::render_text() {

    const auto& shader = get_shader("text");

    shader.use();

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glDisable(GL_DEPTH_TEST);

    shader.set_loc("projection", m_ui_proj_matrix);

    auto& texts = DebugCollector::get().all_texts();
    for (auto& t : texts) {
        t.second.render(shader);
    }

    glEnable(GL_DEPTH_TEST);
}

void Renderer::render_ui() {
    const auto& shader = get_shader("ui");
    shader.use();

    glDisable(GL_DEPTH_TEST);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    shader.set_loc("m_matrix", m_ui_model_matrix);
    shader.set_loc("proj_matrix", m_ui_proj_matrix);

    m_vao[3].bind();
    m_texture_manager.get_ui_array()->bind(0);

    glDrawArrays(GL_TRIANGLES, 0, 6);
    Tools::check_opengl_error();

    glEnable(GL_DEPTH_TEST);
}

void Renderer::update(float delta_time) { m_delta_time = delta_time; }

void Renderer::update_fov(float fov) {
    m_fov = fov;

    m_world_proj_matrix =
        glm::perspective(glm::radians(fov), m_aspect, NEAR_PLANE, FAR_PLANE);
}

void Renderer::update_proj_matrix(float aspect, float width, float height) {
    m_aspect = aspect;

    m_world_proj_matrix =
        glm::perspective(glm::radians(m_fov), aspect, NEAR_PLANE, FAR_PLANE);

    m_ui_proj_matrix = glm::ortho(0.0f, width, height, 0.0f, -1.0f, 1.0f);
    // scale and then translate
    m_ui_model_matrix =
        glm::translate(glm::mat4(1.0f),
                       glm::vec3(width / 2.0f, height / 2.0f, 0.0)) *
        glm::scale(glm::mat4(1.0f), glm::vec3(50.0f, 50.0f, 1.0f));
}

void Renderer::updata_framebuffer(int width, int height) {
    if (width <= 0 || height <= 0)
        return;

    m_world_renderer.updata_framebuffer(width, height);

    FrameBuffer::unbind();

    m_width = width;
    m_height = height;
}

void Renderer::render_dev_panel() {

    glDisable(GL_DEPTH_TEST);
    m_dev_panel.render();
    glEnable(GL_DEPTH_TEST);
}

float& Renderer::ambient_strength() {
    return m_world_renderer.ambient_strength();
}
bool& Renderer::discard_transparent() {
    return m_world_renderer.discard_transparent();
}
bool& Renderer::shader_on() { return m_world_renderer.shader_on(); }
bool& Renderer::water_perturb() { return m_world_renderer.water_perturb(); }
bool& Renderer::water_depth_fade() {
    return m_world_renderer.water_depth_fade();
}
bool& Renderer::pbr() { return m_world_renderer.pbr(); }
bool& Renderer::flip_y() { return m_world_renderer.flip_y(); }
int& Renderer::shadow_mode() { return m_world_renderer.shadow_mode(); }
int& Renderer::light_cull_face() { return m_world_renderer.light_cull_face(); }
int& Renderer::light_size_uv() { return m_world_renderer.light_size_uv(); }
float& Renderer::min_radius() { return m_world_renderer.min_radius(); }
float& Renderer::max_radius() { return m_world_renderer.max_radius(); }
int& Renderer::samples() { return m_world_renderer.samples(); }
float& Renderer::specular_strength() {
    return m_world_renderer.specular_strength();
}
float& Renderer::cloud_speed() { return m_world_renderer.cloud_speed(); }
float& Renderer::cloud_threshold_low() {
    return m_world_renderer.cloud_threshold_low();
}
float& Renderer::cloud_threshold_high() {
    return m_world_renderer.cloud_threshold_high();
}
float& Renderer::refract_strength() {
    return m_world_renderer.refract_strength();
}
float& Renderer::underwater_fog_density() {
    return m_world_renderer.underwater_fog_density();
}
float& Renderer::water_density() { return m_world_renderer.water_density(); }

const Camera& Renderer::camera() const { return m_camera; }
const ClientWorld& Renderer::world() const { return m_world; }
ClientWorld& Renderer::world() { return m_world; }
const glm::mat4& Renderer::world_proj_matrix() const {
    return m_world_proj_matrix;
}
const TextureManager& Renderer::texture_mamger() const {
    return m_texture_manager;
}

float Renderer::delta_time() const { return m_delta_time; }

float Renderer::height() const { return m_height; }
float Renderer::width() const { return m_width; }
const glm::mat4& Renderer::p_mat() const { return m_world_proj_matrix; }
const std::vector<VertexArray>& Renderer::vao() const { return m_vao; }
} // namespace Cubed