Nove repo opengl-learning
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TheRetikGM
214
lessons/3. Model loading/1. Mesh/src/main.cpp
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214
lessons/3. Model loading/1. Mesh/src/main.cpp
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <iostream>
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#include <stb_image.h>
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include "Shader.h"
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#include "Camera.h"
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#include "Model.h"
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#define TEXTURES_DIR "../../../../textures/"
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#define MODELS_DIR "../../../../models/"
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#define SHADERS_DIR "../src/shaders/"
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using namespace std;
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typedef unsigned int uint;
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// Global Constants
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// ...
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// Global Variables
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GLFWwindow* window;
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int WINDOW_WIDTH = 800;
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int WINDOW_HEIGHT = 600;
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Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
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float deltaTime = 0.0f;
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float lastFrame = 0.0f;
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float lastX = 400;
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float lastY = 300;
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bool firstmouse = true;
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glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
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glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
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uint8_t init(void);
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void framebuffersize_callback(GLFWwindow* window, int width, int height);
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void mouse_callback(GLFWwindow* window, double xpos, double ypos);
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void proccessInput(GLFWwindow* window);
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unsigned int load_texture(const char* path, bool flip = true);
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int main(int argc, char** argv)
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{
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if (init() != 0)
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return -1;
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Shader lightingShader(SHADERS_DIR "glmlShader.vert", SHADERS_DIR "glmlShader.frag");
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stbi_set_flip_vertically_on_load(1);
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glml::Model backpack(MODELS_DIR "backpack/backpack.obj");
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glEnable(GL_DEPTH_TEST);
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/* ------------------ MAIN loop ------------------ */
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while (!glfwWindowShouldClose(window)) {
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
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lastFrame = currentFrame; // cas kdy zacal tento frame
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// input ...
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proccessInput(window);
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// rendering commands here ...
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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lightingShader.Use();
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// lightingShader.setVec3("light.position", lightPos);
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glm::mat4 view = myCamera.getViewMatrix();
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glm::mat4 projection(1.0f);
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projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
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glm::mat4 model(1.0f);
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glm::mat3 normalMatrix = glm::transpose(glm::inverse(model));
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lightingShader.setMat4("view", view);
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lightingShader.setMat4("projection", projection);
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lightingShader.setMat4("model", model);
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lightingShader.setMat3("normalMatrix", normalMatrix);
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glm::vec3 lightColor = glm::vec3(1.0f);
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glm::vec3 lightPos = glm::vec3(-1.13f, 2.0f, 2.0f);
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lightingShader.setVec3("pointLights[0].position", lightPos);
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// lightingShader.setVec3("spotLight.direction", myCamera.Front);
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lightingShader.setVec3("pointLights[0].ambient_intensity", glm::vec3(0.1f));
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lightingShader.setVec3("pointLights[0].diffuse_intensity", lightColor * glm::vec3(0.5f));
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lightingShader.setVec3("pointLights[0].specular_intensity", lightColor * glm::vec3(1.0f));
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lightingShader.setFloat("pointLights[0].constant", 1.0f);
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lightingShader.setFloat("pointLights[0].linear", 0.07f);
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lightingShader.setFloat("pointLights[0].quadratic", 0.032f);
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// lightingShader.setFloat("spotLight.cutOff", glm::cos(glm::radians(12.5f)));
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// lightingShader.setFloat("spotLight.outerCutOff", glm::cos(glm::radians(17.5f)));
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lightingShader.setVec3("viewPos", myCamera.Position);
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lightingShader.setFloat("material.shininess", 32.0f);
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backpack.Draw(lightingShader);
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// check and calls events and swap the buffers
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwTerminate();
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return 0;
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}
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uint8_t init(void) {
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// init of glfw window
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "6. Multiple Lights", NULL, NULL);
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if (window == NULL) {
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cerr << "Failed to create glfw window" << endl;
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glfwTerminate();
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return 1;
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}
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glfwMakeContextCurrent(window);
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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// init of GLAD
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
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cerr << "Failed to initialize GLAD" << endl;
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}
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glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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return 0;
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}
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void framebuffersize_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
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WINDOW_HEIGHT = height;
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WINDOW_WIDTH = width;
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}
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void proccessInput(GLFWwindow* window)
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{
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if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
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glfwSetWindowShouldClose(window, true);
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if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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/* -------------------- Movement -------------------- */
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
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myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
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myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
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myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
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myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
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myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
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myCamera.ProccessKeyboard(CAM_UP, deltaTime);
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}
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void mouse_callback(GLFWwindow* window, double xpos, double ypos)
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{
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if (firstmouse) {
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lastX = xpos;
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lastY = ypos;
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firstmouse = false;
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}
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float xoffset = xpos - lastX;
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float yoffset = lastY - ypos;
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lastX = xpos;
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lastY = ypos;
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myCamera.ProccessMouse(xoffset, yoffset);
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}
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
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{
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myCamera.ProccessScroll(yoffset);
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}
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unsigned int load_texture(const char* path, bool flip)
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{
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unsigned int texture = 0;
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int width, height, nrChannels, format;
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stbi_set_flip_vertically_on_load(flip);
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unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
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switch (nrChannels)
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{
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case 4: format = GL_RGBA; break;
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case 3: format = GL_RGB; break;
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case 2: format = GL_RED; break;
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default: format = GL_RGB; break;
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}
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if (data) // data != NULL
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{
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
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glGenerateMipmap(GL_TEXTURE_2D);
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}
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else {
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cerr << "Could not load texture '" << path << "'\n";
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}
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stbi_image_free(data);
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return texture;
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}
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