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 "logger.h"
   9 #include "performance.h"
  10 #include "render.h"
  11 #include "ui.h"
  12
  13 // static const int EXIT_OK = 0;
  14 static const int EXIT_LIB_FAIL = 1;
  15 static const int EXIT_CTX_FAIL = 2;
  16
  17 static GLFWwindow* window;
  18
  19 static void onGlfwError(int error, const char* description);
  20
  21
  22
  23 void init() {
  24         if (window) {
  25                 logError("init called more than once");
  26                 return;
  27         }
  28
  29         logInfo("Assimp %u.%u", aiGetVersionMajor(), aiGetVersionMinor());
  30         logInfo("GLEW %s", (const char*) glewGetString(GLEW_VERSION));
  31         logInfo("GLFW %s", glfwGetVersionString());
  32
  33         glfwSetErrorCallback(onGlfwError);
  34
  35         if (!glfwInit()) {
  36                 logError("GLFW init failed");
  37                 exit(EXIT_LIB_FAIL);
  38         }
  39         // glutInitContextVersion(4,5); TODO establish correct context
  40         // glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
  41         // glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
  42
  43         window = glfwCreateWindow(1280, 720, "shadowclad", NULL, NULL);
  44         if (!window) {
  45                 logError("Window or context creation failed");
  46                 glfwTerminate();
  47                 exit(EXIT_CTX_FAIL);
  48         }
  49
  50         glfwMakeContextCurrent(window);
  51
  52         logInfo("OpenGL %s", (const char*) glGetString(GL_VERSION));
  53         logInfo("GLSL %s", (const char*) glGetString(GL_SHADING_LANGUAGE_VERSION));
  54         logInfo("%s", (const char*) glGetString(GL_RENDERER));
  55
  56         GLenum glewInitStatus = glewInit();
  57         if (glewInitStatus != GLEW_OK) {
  58                 logError("GLEW init failed: %s", (const char*) glewGetErrorString(glewInitStatus));
  59                 exit(EXIT_LIB_FAIL);
  60         }
  61
  62         logInfo("Setting swap interval to 1");
  63         glfwSwapInterval(1);
  64
  65         int width, height;
  66         glfwGetFramebufferSize(window, &width, &height);
  67         resizeStage(window, width, height);
  68
  69         glfwSetFramebufferSizeCallback(window, resizeStage);
  70
  71         initRender();
  72         //initPerformanceMetering();
  73 }
  74
  75 void run(void (*updateFn) (float)) {
  76         if (!updateFn) {
  77                 logError("No update function provided");
  78                 return;
  79         }
  80
  81         float lastTime = glfwGetTime();
  82         float delta = 0.0f;
  83
  84         while (!glfwWindowShouldClose(window)) {
  85                 float time = glfwGetTime();
  86                 delta = time - lastTime;
  87                 lastTime = time;
  88
  89                 updateFn(delta);
  90
  91                 renderFrame(window);
  92                 glfwPollEvents();
  93         }
  94 }
  95
  96 void terminate() {
  97         glfwTerminate();
  98 }
  99
 100 void setKeyboardEventCallback(void (*keyboardEventCallback) (GLFWwindow*, int, int, int, int)) {
 101         glfwSetKeyCallback(window, keyboardEventCallback);
 102 }
 103
 104 static void onGlfwError(int error, const char* description) {
 105         logError("GLFW error: %s", description);
 106 }