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(EngineConfig config) {
  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(config.windowWidth,
  45                                   config.windowHeight,
  46                                   config.windowTitle.cstr,
  47                                   NULL,
  48                                   NULL);
  49
  50         if (!window) {
  51                 logError("Window or context creation failed");
  52                 glfwTerminate();
  53                 exit(EXIT_CTX_FAIL);
  54         }
  55
  56         glfwMakeContextCurrent(window);
  57
  58         logInfo("OpenGL %s", (const char*) glGetString(GL_VERSION));
  59         logInfo("GLSL %s", (const char*) glGetString(GL_SHADING_LANGUAGE_VERSION));
  60         logInfo("Renderer: %s", (const char*) glGetString(GL_RENDERER));
  61
  62         GLenum glewInitStatus = glewInit();
  63         if (glewInitStatus != GLEW_OK) {
  64                 logError("GLEW init failed: %s", (const char*) glewGetErrorString(glewInitStatus));
  65                 exit(EXIT_LIB_FAIL);
  66         }
  67
  68         logInfo("Setting swap interval: %d", config.swapInterval);
  69         glfwSwapInterval(config.swapInterval);
  70
  71         int width, height;
  72         glfwGetFramebufferSize(window, &width, &height);
  73         resizeStage(window, width, height);
  74
  75         glfwSetFramebufferSizeCallback(window, resizeStage);
  76         glfwSetKeyCallback(window, onKeyboardEvent);
  77
  78         initRender();
  79         //initPerformanceMetering();
  80 }
  81
  82 void run(void (*updateFn) (float)) {
  83         if (!updateFn) {
  84                 logError("No update function provided");
  85                 return;
  86         }
  87
  88         float lastTime = glfwGetTime();
  89         float delta = 0.0f;
  90
  91         while (!glfwWindowShouldClose(window)) {
  92                 float time = glfwGetTime();
  93                 delta = time - lastTime;
  94                 lastTime = time;
  95
  96                 updateFn(delta);
  97
  98                 renderFrame(window);
  99                 glfwPollEvents();
 100         }
 101 }
 102
 103 void terminate() {
 104         glfwTerminate();
 105 }
 106
 107 EngineConfig defaultConfig() {
 108         return (EngineConfig) { .windowWidth = 800,
 109                                 .windowHeight = 600,
 110                                 .windowTitle = newString(NULL),
 111                                 .swapInterval = 1 };
 112 }
 113
 114 static void onGlfwError(int error, const char* description) {
 115         logError("GLFW error: %s", description);
 116 }