src/init.cpp

   1 #include "init.hpp"
   2
   3 #include <algorithm>
   4 #include <SDL.h>
   5 #include <SDL_image.h>
   6 #include <stdexcept>
   7 #include <string>
   8 #include <GL/glew.h>
   9
  10
  11 namespace {
  12
  13 void sdl_error(std::string msg) {
  14         const char *error = SDL_GetError();
  15         if (*error != '\0') {
  16                 msg += ": ";
  17                 msg += error;
  18                 SDL_ClearError();
  19         }
  20         throw std::runtime_error(msg);
  21 }
  22
  23 }
  24
  25 namespace blank {
  26
  27 InitSDL::InitSDL() {
  28         if (SDL_Init(SDL_INIT_VIDEO) != 0) {
  29                 sdl_error("SDL_Init(SDL_INIT_VIDEO)");
  30         }
  31 }
  32
  33 InitSDL::~InitSDL() {
  34         SDL_Quit();
  35 }
  36
  37
  38 InitIMG::InitIMG() {
  39         if (IMG_Init(IMG_INIT_PNG) == 0) {
  40                 sdl_error("IMG_Init(IMG_INIT_PNG)");
  41         }
  42 }
  43
  44 InitIMG::~InitIMG() {
  45         IMG_Quit();
  46 }
  47
  48
  49 InitGL::InitGL() {
  50         if (SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3) != 0) {
  51                 sdl_error("SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3)");
  52         }
  53         if (SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3) != 0) {
  54                 sdl_error("SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3)");
  55         }
  56         if (SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE) != 0) {
  57                 sdl_error("SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE)");
  58         }
  59
  60         if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1) != 0) {
  61                 sdl_error("SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1)");
  62         }
  63 }
  64
  65
  66 Window::Window()
  67 : handle(SDL_CreateWindow(
  68         "blank",
  69         SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
  70         960, 600,
  71         SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE
  72 )) {
  73         if (!handle) {
  74                 sdl_error("SDL_CreateWindow");
  75         }
  76 }
  77
  78 Window::~Window() {
  79         SDL_DestroyWindow(handle);
  80 }
  81
  82 void Window::GrabInput() {
  83         SDL_SetWindowGrab(handle, SDL_TRUE);
  84 }
  85
  86 void Window::ReleaseInput() {
  87         SDL_SetWindowGrab(handle, SDL_FALSE);
  88 }
  89
  90 void Window::GrabMouse() {
  91         if (SDL_SetRelativeMouseMode(SDL_TRUE) != 0) {
  92                 sdl_error("SDL_SetRelativeMouseMode");
  93         }
  94 }
  95
  96 void Window::ReleaseMouse() {
  97         if (SDL_SetRelativeMouseMode(SDL_FALSE) != 0) {
  98                 sdl_error("SDL_SetRelativeMouseMode");
  99         }
 100 }
 101
 102 GLContext Window::CreateContext() {
 103         return GLContext(handle);
 104 }
 105
 106 void Window::Flip() {
 107         SDL_GL_SwapWindow(handle);
 108 }
 109
 110
 111 GLContext::GLContext(SDL_Window *win)
 112 : handle(SDL_GL_CreateContext(win)) {
 113         if (!handle) {
 114                 sdl_error("SDL_GL_CreateContext");
 115         }
 116 }
 117
 118 GLContext::~GLContext() {
 119         if (handle) {
 120                 SDL_GL_DeleteContext(handle);
 121         }
 122 }
 123
 124
 125 GLContext::GLContext(GLContext &&other)
 126 : handle(other.handle) {
 127         other.handle = nullptr;
 128 }
 129
 130 GLContext &GLContext::operator =(GLContext &&other) {
 131         std::swap(handle, other.handle);
 132         return *this;
 133 }
 134
 135 void GLContext::EnableVSync() {
 136         if (SDL_GL_SetSwapInterval(1) != 0) {
 137                 sdl_error("SDL_GL_SetSwapInterval");
 138         }
 139 }
 140
 141 void GLContext::EnableDepthTest() {
 142         glEnable(GL_DEPTH_TEST);
 143         glDepthFunc(GL_LESS);
 144 }
 145
 146 void GLContext::EnableBackfaceCulling() {
 147         glEnable(GL_CULL_FACE);
 148 }
 149
 150 void GLContext::Clear() {
 151         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 152 }
 153
 154 void GLContext::ClearDepthBuffer() {
 155         glClear(GL_DEPTH_BUFFER_BIT);
 156 }
 157
 158
 159 InitGLEW::InitGLEW() {
 160         glewExperimental = GL_TRUE;
 161         GLenum glew_err = glewInit();
 162         if (glew_err != GLEW_OK) {
 163                 std::string msg("glewInit: ");
 164                 const GLubyte *errBegin = glewGetErrorString(glew_err);
 165                 const GLubyte *errEnd = errBegin;
 166                 while (*errEnd != '\0') {
 167                         ++errEnd;
 168                 }
 169                 msg.append(errBegin, errEnd);
 170                 throw std::runtime_error(msg);
 171         }
 172 }
 173
 174 }