368 lines
11 KiB
C++
368 lines
11 KiB
C++
#include <stdlib.h>
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#include <stdio.h>
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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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_m.h"
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#include <iostream>
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#include <filesystem>
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void framebuffer_size_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 processInput(GLFWwindow *window);
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// settings
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const unsigned int WINDOWWIDTH = 1280;
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const unsigned int WINDOWHEIGHT = 720;
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// camera
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glm::vec3 player_pos = glm::vec3(0.0f, 0.0f, 3.0f);
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glm::vec3 camera_front = glm::vec3(0.0f, 0.0f, -1.0f);
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glm::vec3 camera_up = glm::vec3(0.0f, 1.0f, 0.0f);
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bool first_mouse = true;
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float yaw = -90.0f;
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float pitch = 0.0f;
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float lastX = WINDOWWIDTH / 2.0;
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float lastY = WINDOWHEIGHT / 2.0;
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float fov = 60.0f;
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float timed = 0.0f;
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float last_frame = 0.0f;
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float camera_speed = 10.0f;
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const char *projectionC = "projection";
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const char *viewC = "view";
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const char *modelC = "model";
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const char *viewposC = "viewPos";
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const char *lightcolorC = "lightColor";
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const char *objectcolorC = "objectColor";
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int main()
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{
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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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GLFWwindow* window = glfwCreateWindow(WINDOWWIDTH, WINDOWHEIGHT, "LearnOpenGL", NULL, NULL);
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if (window == NULL)
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{
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printf("Failed to create GLFW window.\n");
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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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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
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{
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printf("Failed to initialize GLAD.\n");
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return -1;
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}
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glEnable(GL_DEPTH_TEST);
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FILE* fp = fopen("vertexshader.txt", "r");
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if (!fp) {
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printf("failed to open vertex shader!\n");
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return -1;
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}
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fseek(fp, 0L, SEEK_END);
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unsigned int vertex_sz = ftell(fp);
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rewind(fp);
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char *vertex_buffer = (char *)calloc(sizeof(char), vertex_sz + 1);
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if (fread(vertex_buffer, vertex_sz, 1, fp) != 1) {
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printf("failed to read vertex shader!\n");
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return -1;
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}
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fclose(fp);
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int vertex_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex_shader, 1, &vertex_buffer, NULL);
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glCompileShader(vertex_shader);
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int success;
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glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
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if (!success) {
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char infoLog[1024];
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glGetShaderInfoLog(vertex_shader, 1024, NULL, infoLog);
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printf("Vertex shader compile error: %s\n", infoLog);
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glfwTerminate();
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return -1;
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}
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fp = fopen("fragmentshader.txt", "r");
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if (!fp) {
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printf("failed to open fragment shader!\n");
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return -1;
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}
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fseek(fp, 0L, SEEK_END);
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unsigned int fragment_sz = ftell(fp);
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rewind(fp);
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char *fragment_buffer = (char *)calloc(sizeof(char), fragment_sz + 1);
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if (fread(fragment_buffer, fragment_sz, 1, fp) != 1) {
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printf("failed to read fragment shader!\n");
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return -1;
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}
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fclose(fp);
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int fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragment_shader, 1, &fragment_buffer, NULL);
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glCompileShader(fragment_shader);
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glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
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if (!success) {
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char infoLog[1024];
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glGetShaderInfoLog(fragment_shader, 1024, NULL, infoLog);
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printf("Fragment shader compile error: %s\n", infoLog);
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glfwTerminate();
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return -1;
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}
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int program = glCreateProgram();
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glAttachShader(program, vertex_shader);
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glAttachShader(program, fragment_shader);
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &success);
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if (!success) {
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char infoLog[1024];
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glGetProgramInfoLog(program, 1024, NULL, infoLog);
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printf("Shader program link error: %s\n", infoLog);
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glfwTerminate();
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return -1;
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}
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glDeleteShader(vertex_shader);
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glDeleteShader(fragment_shader);
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free(vertex_buffer);
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free(fragment_buffer);
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fp = fopen("maze.txt", "r");
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fscanf(fp, "%f %f %f %f\n", &player_pos.x, &player_pos.y, &player_pos.z, &yaw);
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int num_surfaces;
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fscanf(fp, "%d\n", &num_surfaces);
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// num surfaces * 6 (vertices per point) * 6 (floats per point)
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// add 1 for floor
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int num_walls = (num_surfaces) * 6 * 6;
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float *wall_vertices = (float *)calloc(sizeof(float), num_surfaces * 6 * 6);
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// read walls
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for (int i = 0; i < num_surfaces; i++) {
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for (int j = 0; j < 6; j++) {
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int vix = i*6*6 + j*6;
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fscanf(
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fp,
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"%f %f %f %f %f %f\n",
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&wall_vertices[vix],
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&wall_vertices[vix+1],
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&wall_vertices[vix+2],
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&wall_vertices[vix+3],
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&wall_vertices[vix+4],
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&wall_vertices[vix+5]
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);
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}
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fscanf(fp, "\n");
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}
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// read floor
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float *floor_vertices = (float *)calloc(sizeof(float), 6*6);
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for (int j = 0; j < 6; j++) {
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int vix = j*6;
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fscanf(
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fp,
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"%f %f %f %f %f %f\n",
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&floor_vertices[vix],
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&floor_vertices[vix+1],
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&floor_vertices[vix+2],
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&floor_vertices[vix+3],
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&floor_vertices[vix+4],
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&floor_vertices[vix+5]
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);
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}
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fclose(fp);
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// do stuff for walls
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unsigned int wallsVBO, wallsVAO;
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glGenVertexArrays(1, &wallsVAO);
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glGenBuffers(1, &wallsVBO);
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glBindVertexArray(wallsVAO);
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glBindBuffer(GL_ARRAY_BUFFER, wallsVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * num_walls, wall_vertices, GL_STATIC_DRAW);
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// position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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// normal attribute
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3 * sizeof(float)));
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glEnableVertexAttribArray(1);
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// do stuff for floor
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unsigned int floorVBO, floorVAO;
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glGenVertexArrays(1, &floorVAO);
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glGenBuffers(1, &floorVBO);
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glBindVertexArray(floorVAO);
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glBindBuffer(GL_ARRAY_BUFFER, floorVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 6 * 1, floor_vertices, GL_STATIC_DRAW);
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// position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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// normal attribute
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3 * sizeof(float)));
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glEnableVertexAttribArray(1);
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int time_sec = 0, num_frames = 0;
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while (!glfwWindowShouldClose(window))
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{
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float current_frame = static_cast<float>(glfwGetTime());
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int current_frameI = (int)current_frame;
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if (current_frameI != time_sec) {
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printf("FPS: %d\n", num_frames);
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time_sec = current_frameI;
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num_frames = 0;
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} else {
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num_frames++;
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}
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timed = current_frame - last_frame;
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last_frame = current_frame;
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processInput(window);
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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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glUseProgram(program);
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glm::mat4 projection = glm::perspective(glm::radians(fov), (float)WINDOWWIDTH / (float)WINDOWHEIGHT, 0.1f, 256.0f);
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glUniformMatrix4fv(glGetUniformLocation(program, projectionC), 1, GL_FALSE, &projection[0][0]);
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glm::mat4 view = glm::lookAt(player_pos, player_pos + camera_front, camera_up);
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glUniformMatrix4fv(glGetUniformLocation(program, viewC), 1, GL_FALSE, &view[0][0]);
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glm::vec3 wall_color = glm::vec3(0.5f, 0.5f, 0.5f);
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glUniform3fv(glGetUniformLocation(program, objectcolorC), 1, &wall_color[0]);
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glm::vec3 light_color = glm::vec3(1.0f, 1.0f, 1.0f);
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glUniform3fv(glGetUniformLocation(program, lightcolorC), 1, &light_color[0]);
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glUniform3fv(glGetUniformLocation(program, viewposC), 1, &player_pos[0]);
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glm::mat4 model = glm::mat4(1.0f);
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glUniformMatrix4fv(glGetUniformLocation(program, modelC), 1, GL_FALSE, &model[0][0]);
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glBindVertexArray(wallsVAO);
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glDrawArrays(GL_TRIANGLES, 0, num_walls);
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glm::vec3 floor_color = glm::vec3(0.1f, 0.1f, 0.1f);
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glUniform3fv(glGetUniformLocation(program, objectcolorC), 1, &floor_color[0]);
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glBindVertexArray(floorVAO);
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glDrawArrays(GL_TRIANGLES, 0, 6 * 6 * 1);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glDeleteVertexArrays(1, &wallsVAO);
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glDeleteBuffers(1, &wallsVBO);
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glDeleteVertexArrays(1, &floorVAO);
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glDeleteBuffers(1, &floorVBO);
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glfwTerminate();
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return 0;
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}
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void processInput(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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float camera_speed_adjusted = static_cast<float>(camera_speed * timed);
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glm::vec3 movement;
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
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movement = glm::vec3(camera_front.x, 0.0, camera_front.z);
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player_pos += glm::normalize(movement) * camera_speed_adjusted;
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} else if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
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movement = glm::vec3(-camera_front.x, 0.0, -camera_front.z);
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player_pos += glm::normalize(movement) * camera_speed_adjusted;
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} else if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
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glm::vec3 right = glm::cross(camera_front, camera_up);
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movement = glm::vec3(right.x, 0.0, right.z);
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player_pos -= glm::normalize(movement) * camera_speed_adjusted;
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} else if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
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glm::vec3 right = glm::cross(camera_front, camera_up);
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movement = glm::vec3(right.x, 0.0, right.z);
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player_pos += glm::normalize(movement) * camera_speed_adjusted;
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}
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}
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void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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void mouse_callback(GLFWwindow* window, double xpos_in, double ypos_in)
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{
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float xpos = static_cast<float>(xpos_in);
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float ypos = static_cast<float>(ypos_in);
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if (first_mouse)
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{
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lastX = xpos;
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lastY = ypos;
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first_mouse = 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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float sensitivity = 0.1f;
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xoffset *= sensitivity;
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yoffset *= sensitivity;
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yaw += xoffset;
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pitch += yoffset;
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if (pitch > 89.0f)
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pitch = 89.0f;
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if (pitch < -89.0f)
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pitch = -89.0f;
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glm::vec3 front;
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front.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
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front.y = sin(glm::radians(pitch));
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front.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
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camera_front = glm::normalize(front);
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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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fov -= (float)yoffset;
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if (fov < 1.0f)
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fov = 1.0f;
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if (fov > 90.0f)
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fov = 90.0f;
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}
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