src/engine/engine.c

   1 #include "engine.h"
   2
   3 #include <stdlib.h>
   4 #include <assimp/version.h>
   5 #include <GL/glxew.h>
   6 #include <GLFW/glfw3.h>
   7
   8 #include "input.h"
   9 #include "logger.h"
  10 #include "performance.h"
  11 #include "render.h"
  12 #include "ui.h"
  13
  14 // static const int EXIT_OK = 0;
  15 static const int EXIT_LIB_FAIL = 1;
  16 static const int EXIT_CTX_FAIL = 2;
  17
  18 static GLFWwindow* window;
  19
  20 static void onGlfwError(int error, const char* description);
  21
  22
  23
  24 void init() {
  25         if (window) {
  26                 logError("init called more than once");
  27                 return;
  28         }
  29
  30         logInfo("Assimp %u.%u", aiGetVersionMajor(), aiGetVersionMinor());
  31         logInfo("GLEW %s", (const char*) glewGetString(GLEW_VERSION));
  32         logInfo("GLFW %s", glfwGetVersionString());
  33
  34         glfwSetErrorCallback(onGlfwError);
  35
  36         if (!glfwInit()) {
  37                 logError("GLFW init failed");
  38                 exit(EXIT_LIB_FAIL);
  39         }
  40         // glutInitContextVersion(4,5); TODO establish correct context
  41         // glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
  42         // glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
  43
  44         window = glfwCreateWindow(1280, 720, "shadowclad", NULL, NULL);
  45         if (!window) {
  46                 logError("Window or context creation failed");
  47                 glfwTerminate();
  48                 exit(EXIT_CTX_FAIL);
  49         }
  50
  51         glfwMakeContextCurrent(window);
  52
  53         logInfo("OpenGL %s", (const char*) glGetString(GL_VERSION));
  54         logInfo("GLSL %s", (const char*) glGetString(GL_SHADING_LANGUAGE_VERSION));
  55         logInfo("%s", (const char*) glGetString(GL_RENDERER));
  56
  57         GLenum glewInitStatus = glewInit();
  58         if (glewInitStatus != GLEW_OK) {
  59                 logError("GLEW init failed: %s", (const char*) glewGetErrorString(glewInitStatus));
  60                 exit(EXIT_LIB_FAIL);
  61         }
  62
  63         logInfo("Setting swap interval to 1");
  64         glfwSwapInterval(1);
  65
  66         int width, height;
  67         glfwGetFramebufferSize(window, &width, &height);
  68         resizeStage(window, width, height);
  69
  70         glfwSetFramebufferSizeCallback(window, resizeStage);
  71         glfwSetKeyCallback(window, onKeyboardEvent);
  72
  73         initRender();
  74         //initPerformanceMetering();
  75 }
  76
  77 void run(void (*updateFn) (float)) {
  78         if (!updateFn) {
  79                 logError("No update function provided");
  80                 return;
  81         }
  82
  83         float lastTime = glfwGetTime();
  84         float delta = 0.0f;
  85
  86         while (!glfwWindowShouldClose(window)) {
  87                 float time = glfwGetTime();
  88                 delta = time - lastTime;
  89                 lastTime = time;
  90
  91                 updateFn(delta);
  92
  93                 renderFrame(window);
  94                 glfwPollEvents();
  95         }
  96 }
  97
  98 void terminate() {
  99         glfwTerminate();
 100 }
 101
 102 static void onGlfwError(int error, const char* description) {
 103         logError("GLFW error: %s", description);
 104 }