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https://github.com/JoeyDeVries/LearnOpenGL.git
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Initial commit, all code samples with working CMake script for VS/Windows.
This commit is contained in:
Joey de Vries
298
src/1.getting_started/7.camera/camera_with_class.cpp
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298
src/1.getting_started/7.camera/camera_with_class.cpp
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// Std. Includes
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#include <string>
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// GLEW
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#define GLEW_STATIC
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#include <GL/glew.h>
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// GLFW
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#include <GLFW/glfw3.h>
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// GL includes
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#include <learnopengl/shader.h>
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#include <learnopengl/camera.h>
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// GLM Mathemtics
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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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// Other Libs
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#include <SOIL.h>
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// Properties
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GLuint screenWidth = 800, screenHeight = 600;
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// Function prototypes
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void mouse_callback(GLFWwindow* window, double xpos, double ypos);
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void Do_Movement();
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// Camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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bool keys[1024];
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GLfloat lastX = 400, lastY = 300;
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bool firstMouse = true;
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GLfloat deltaTime = 0.0f;
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GLfloat lastFrame = 0.0f;
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// The MAIN function, from here we start our application and run our Game loop
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int main()
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{
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// Init GLFW
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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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glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
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glfwWindowHint(GLFW_SAMPLES, 4);
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GLFWwindow* window = glfwCreateWindow(screenWidth, screenHeight, "LearnOpenGL", nullptr, nullptr); // Windowed
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glfwMakeContextCurrent(window);
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// Set the required callback functions
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glfwSetKeyCallback(window, key_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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// Options
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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// Initialize GLEW to setup the OpenGL Function pointers
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glewExperimental = GL_TRUE;
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glewInit();
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// Define the viewport dimensions
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glViewport(0, 0, screenWidth, screenHeight);
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// Setup some OpenGL options
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glEnable(GL_DEPTH_TEST);
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// Setup and compile our shaders
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Shader ourShader("coordinate_systems.vs", "coordinate_systems.frag");
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// Set up our vertex data (and buffer(s)) and attribute pointers
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GLfloat vertices[] = {
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
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};
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glm::vec3 cubePositions[] = {
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glm::vec3(0.0f, 0.0f, 0.0f),
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glm::vec3(2.0f, 5.0f, -15.0f),
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glm::vec3(-1.5f, -2.2f, -2.5f),
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glm::vec3(-3.8f, -2.0f, -12.3f),
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glm::vec3(2.4f, -0.4f, -3.5f),
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glm::vec3(-1.7f, 3.0f, -7.5f),
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glm::vec3(1.3f, -2.0f, -2.5f),
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glm::vec3(1.5f, 2.0f, -2.5f),
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glm::vec3(1.5f, 0.2f, -1.5f),
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glm::vec3(-1.3f, 1.0f, -1.5f)
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};
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GLuint VBO, VAO;
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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// Bind our Vertex Array Object first, then bind and set our buffers and pointers.
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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// Position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(0);
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// TexCoord attribute
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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glEnableVertexAttribArray(2);
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glBindVertexArray(0); // Unbind VAO
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// Load and create a texture
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GLuint texture1;
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GLuint texture2;
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// --== TEXTURE 1 == --
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glGenTextures(1, &texture1);
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glBindTexture(GL_TEXTURE_2D, texture1); // All upcoming GL_TEXTURE_2D operations now have effect on our texture object
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// Set our texture parameters
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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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// Set texture filtering
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Load, create texture and generate mipmaps
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int width, height;
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unsigned char* image = SOIL_load_image("../../../resources/textures/container.jpg", &width, &height, 0, SOIL_LOAD_RGB);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
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glGenerateMipmap(GL_TEXTURE_2D);
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SOIL_free_image_data(image);
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glBindTexture(GL_TEXTURE_2D, 0); // Unbind texture when done, so we won't accidentily mess up our texture.
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// --== TEXTURE 2 == --
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glGenTextures(1, &texture2);
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glBindTexture(GL_TEXTURE_2D, texture2);
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// Set our texture parameters
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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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// Set texture filtering
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Load, create texture and generate mipmaps
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image = SOIL_load_image("../../../resources/textures/awesomeface.png", &width, &height, 0, SOIL_LOAD_RGB);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
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glGenerateMipmap(GL_TEXTURE_2D);
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SOIL_free_image_data(image);
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glBindTexture(GL_TEXTURE_2D, 0);
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// Game loop
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while(!glfwWindowShouldClose(window))
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{
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// Set frame time
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GLfloat currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// Check and call events
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glfwPollEvents();
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Do_Movement();
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// Clear the colorbuffer
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glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// Draw our first triangle
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ourShader.Use();
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// Bind Textures using texture units
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture1);
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glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture1"), 0);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, texture2);
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glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture2"), 1);
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// Create camera transformation
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glm::mat4 view;
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view = camera.GetViewMatrix();
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glm::mat4 projection;
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projection = glm::perspective(camera.Zoom, (float)screenWidth/(float)screenHeight, 0.1f, 1000.0f);
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// Get the uniform locations
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GLint modelLoc = glGetUniformLocation(ourShader.Program, "model");
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GLint viewLoc = glGetUniformLocation(ourShader.Program, "view");
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GLint projLoc = glGetUniformLocation(ourShader.Program, "projection");
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// Pass the matrices to the shader
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glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
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glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
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glBindVertexArray(VAO);
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for(GLuint i = 0; i < 10; i++)
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{
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// Calculate the model matrix for each object and pass it to shader before drawing
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glm::mat4 model;
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model = glm::translate(model, cubePositions[i]);
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GLfloat angle = 20.0f * i;
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model = glm::rotate(model, angle, glm::vec3(1.0f, 0.3f, 0.5f));
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glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
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glDrawArrays(GL_TRIANGLES, 0, 36);
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}
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glBindVertexArray(0);
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// Swap the buffers
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glfwSwapBuffers(window);
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}
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// Properly de-allocate all resources once they've outlived their purpose
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glDeleteVertexArrays(1, &VAO);
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glDeleteBuffers(1, &VBO);
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glfwTerminate();
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return 0;
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}
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// Moves/alters the camera positions based on user input
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void Do_Movement()
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{
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// Camera controls
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if(keys[GLFW_KEY_W])
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camera.ProcessKeyboard(FORWARD, deltaTime);
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if(keys[GLFW_KEY_S])
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camera.ProcessKeyboard(BACKWARD, deltaTime);
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if(keys[GLFW_KEY_A])
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camera.ProcessKeyboard(LEFT, deltaTime);
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if(keys[GLFW_KEY_D])
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camera.ProcessKeyboard(RIGHT, deltaTime);
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}
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// Is called whenever a key is pressed/released via GLFW
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
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{
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//cout << key << endl;
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if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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glfwSetWindowShouldClose(window, GL_TRUE);
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if(action == GLFW_PRESS)
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keys[key] = true;
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else if(action == GLFW_RELEASE)
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keys[key] = false;
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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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{
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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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GLfloat xoffset = xpos - lastX;
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GLfloat yoffset = lastY - ypos; // Reversed since y-coordinates go from bottom to left
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lastX = xpos;
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lastY = ypos;
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camera.ProcessMouseMovement(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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camera.ProcessMouseScroll(yoffset);
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}
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