SkyboxRenderer.cpp

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//
// Created by denzel on 14/06/2025.
//
 
#include "hellfire/graphics/renderer/SkyboxRenderer.h"
 
#include <glm/gtc/type_ptr.hpp>
 
#include "../core/Application.h"
#include <GL/glew.h>
 
#include "Mesh.h"
#include "Skybox.h"
#include "Geometry/Cube.h"
#include "hellfire/utilities/ServiceLocator.h"
 
namespace hellfire {
    void SkyboxRenderer::initialize() {
        if (!initialized_) {
            setup_skybox_geometry();
            load_skybox_shader();
        }
    }
 
    void SkyboxRenderer::setup_skybox_geometry() {
        skybox_mesh_ = Cube::create_mesh();
    }
 
    void SkyboxRenderer::load_skybox_shader() {
        skybox_shader_id_ = ServiceLocator::get_service<ShaderManager>()->load_shader_from_files(
            "assets/shaders/skybox.vert", "assets/shaders/skybox.frag");
        skybox_shader_ = Shader::from_id(skybox_shader_id_);
    }
 
    void SkyboxRenderer::render(const Skybox &skybox, const CameraComponent *camera) const {
        if (!skybox.is_loaded() || !skybox_shader_.is_valid()) return;
 
        // Save current depth state
        glDepthFunc(GL_LEQUAL);
        skybox_shader_.use();
 
        // Remove translation from view matrix
        glm::mat4 view = glm::mat4(glm::mat3(camera->get_view_matrix()));
        glm::mat4 projection = camera->get_projection_matrix();
 
        skybox_shader_.set_mat4("view", view);
        skybox_shader_.set_mat4("projection", projection);
 
        // Set tint and exposure
        skybox_shader_.set_vec3("tint", skybox.get_tint());
        skybox_shader_.set_float("exposure", skybox.get_exposure());
 
        // Bind cubemap
        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_CUBE_MAP, skybox.get_cubemap());
        skybox_shader_.set_int("skyboxes", 0);
 
        // Draw skyboxes cube
        skybox_mesh_->bind();
        skybox_mesh_->draw();
        skybox_mesh_->unbind();
 
        // Restore depth state
        glDepthFunc(GL_LESS);
    }
}