src/screen.cpp

   1 #include "common.h"
   2 #include "screen.h"
   3
   4 #include "SDL_opengl.h"
   5
   6 using namespace IPDF;
   7 using namespace std;
   8
   9 Screen::Screen()
  10 {
  11         SDL_Init(SDL_INIT_VIDEO);
  12         m_window = SDL_CreateWindow("IPDF", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
  13                         800, 600, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
  14
  15         if (!m_window)
  16         {
  17                 Fatal("Couldn't create window!");
  18         }
  19
  20         m_gl_context = SDL_GL_CreateContext(m_window);
  21
  22         glClearColor(1.f,1.f,1.f,1.f);
  23         glClear(GL_COLOR_BUFFER_BIT);
  24         Present();
  25
  26         ResizeViewport(800, 600);
  27
  28 }
  29
  30 Screen::~Screen()
  31 {
  32         SDL_GL_DeleteContext(m_gl_context);
  33         SDL_DestroyWindow(m_window);
  34         SDL_Quit();
  35 }
  36
  37 void Screen::ResizeViewport(int width, int height)
  38 {
  39         glViewport(0, 0, width, height);
  40         m_viewport_width = width;
  41         m_viewport_height = height;
  42 }
  43
  44 bool Screen::PumpEvents()
  45 {
  46         SDL_Event evt;
  47         bool no_quit_requested = true;
  48         while (SDL_PollEvent(&evt))
  49         {
  50                 switch (evt.type)
  51                 {
  52                 case SDL_QUIT:
  53                         no_quit_requested = false;
  54                         break;
  55                 case SDL_WINDOWEVENT:
  56                         switch (evt.window.event)
  57                         {
  58                         case SDL_WINDOWEVENT_RESIZED:
  59                         case SDL_WINDOWEVENT_SIZE_CHANGED:
  60                                 ResizeViewport(evt.window.data1, evt.window.data2);
  61                                 break;
  62                         }
  63                         break;
  64                 case SDL_MOUSEMOTION:
  65                         m_last_mouse_x = evt.motion.x;
  66                         m_last_mouse_y = evt.motion.y;
  67                         if (m_mouse_handler)
  68                         {
  69                                 m_mouse_handler(evt.motion.x, evt.motion.y,evt.motion.state, 0);
  70                         }
  71                         break;
  72                 case SDL_MOUSEBUTTONDOWN:
  73                 case SDL_MOUSEBUTTONUP:
  74                         m_last_mouse_x = evt.button.x;
  75                         m_last_mouse_y = evt.button.y;
  76                         if (m_mouse_handler)
  77                         {
  78                                 m_mouse_handler(evt.button.x, evt.button.y, evt.button.state, 0);
  79                         }
  80                         break;
  81                 case SDL_MOUSEWHEEL:
  82                         if (m_mouse_handler)
  83                         {
  84                                 m_mouse_handler(m_last_mouse_x, m_last_mouse_y, 0, evt.wheel.y);
  85                         }
  86                         break;
  87                 case SDL_KEYDOWN:
  88                 {
  89                         Debug("Key %c down", (char)evt.key.keysym.sym);
  90                         if (isalnum((char)evt.key.keysym.sym))
  91                         {
  92                                 char filename[] = "0.bmp";
  93                                 filename[0] = (char)evt.key.keysym.sym;
  94                                 ScreenShot(filename);
  95                         }
  96                 }
  97                 default:
  98                         break;
  99                 }
 100         }
 101         return no_quit_requested;
 102 }
 103
 104 void Screen::SetMouseCursor(Screen::MouseCursors cursor)
 105 {
 106         SDL_SystemCursor system_cursor_id = SDL_SYSTEM_CURSOR_ARROW;
 107         switch (cursor)
 108         {
 109         case CursorArrow: system_cursor_id = SDL_SYSTEM_CURSOR_ARROW; break;
 110         case CursorWait: system_cursor_id = SDL_SYSTEM_CURSOR_WAIT; break;
 111         case CursorWaitArrow: system_cursor_id = SDL_SYSTEM_CURSOR_WAITARROW; break;
 112         case CursorMove: system_cursor_id = SDL_SYSTEM_CURSOR_SIZEALL; break;
 113         case CursorHand: system_cursor_id = SDL_SYSTEM_CURSOR_HAND; break;
 114         default: break;
 115         }
 116         SDL_Cursor *system_cursor = SDL_CreateSystemCursor(system_cursor_id);
 117         SDL_SetCursor(system_cursor);
 118         //TODO: Check if we need to free the system cursors.
 119 }
 120
 121 void Screen::Present()
 122 {
 123         SDL_GL_SwapWindow(m_window);
 124 }
 125
 126 void Screen::ScreenShot(const char * filename) const
 127 {
 128         Debug("Attempting to save BMP to file %s", filename);
 129
 130         int w = ViewportWidth();
 131         int h = ViewportHeight();
 132         unsigned char * pixels = new unsigned char[w*h*4];
 133         if (pixels == NULL)
 134                 Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
 135
 136
 137         glReadBuffer(GL_FRONT);
 138         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 139
 140         glReadPixels(0,0,w, h, GL_BGRA, GL_UNSIGNED_BYTE, pixels);
 141
 142         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0,0,0,0);
 143         if (surf == NULL)
 144                 Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
 145
 146         GLenum texture_format = (surf->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 147         Debug("SDL_Surface %d BytesPerPixel, format %d (RGB = %d, BGR = %d, RGBA = %d, BGRA = %d)", surf->format->BytesPerPixel, texture_format, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA);
 148
 149         if (SDL_SaveBMP(surf, filename) != 0)
 150                 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
 151
 152         SDL_FreeSurface(surf);
 153         delete [] pixels;
 154         Debug("Succeeded!");
 155 }
 156
 157 /**
 158  * Render a BMP
 159  * NOT PART OF THE DOCUMENT FORMAT
 160  */
 161 void Screen::RenderBMP(const char * filename) const
 162 {
 163         SDL_Surface * bmp = SDL_LoadBMP(filename);
 164         if (bmp == NULL)
 165                 Fatal("Failed to load BMP from %s - %s", filename, SDL_GetError());
 166
 167         int w = bmp->w;
 168         int h = bmp->h;
 169
 170         GLenum texture_format;
 171         switch (bmp->format->BytesPerPixel)
 172         {
 173                 case 4: //contains alpha
 174                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 175                         break;
 176                 case 3: //does not contain alpha
 177                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
 178                         break;
 179                 default:
 180                         Fatal("Could not understand SDL_Surface format (%d colours)", bmp->format->BytesPerPixel);
 181                         break;
 182         }
 183
 184         //Debug("SDL_Surface %d BytesPerPixel, format %d (RGB = %d, BGR = %d, RGBA = %d, BGRA = %d)", bmp->format->BytesPerPixel, texture_format, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA);
 185
 186
 187         GLuint texID;
 188         glEnable(GL_TEXTURE_2D);
 189         glGenTextures(1, &texID);
 190         glBindTexture(GL_TEXTURE_2D, texID);
 191
 192         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 193         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 194         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 195         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 196
 197         glTexImage2D(GL_TEXTURE_2D, 0, bmp->format->BytesPerPixel, w, h, 0, texture_format, GL_UNSIGNED_BYTE, bmp->pixels);
 198
 199         glMatrixMode(GL_PROJECTION);
 200         glLoadIdentity();
 201         glOrtho(0.0, 1.0, 1.0, 0.0, -1.f, 1.f);
 202         glMatrixMode(GL_MODELVIEW);
 203         glLoadIdentity();
 204
 205         glBegin(GL_QUADS);
 206                 glTexCoord2i(0,0); glVertex2f(0,0);
 207                 glTexCoord2i(1,0); glVertex2f(1,0);
 208                 glTexCoord2i(1,1); glVertex2f(1,1);
 209                 glTexCoord2i(0,1); glVertex2f(0,1);
 210         glEnd();
 211
 212         glDisable(GL_TEXTURE_2D);
 213         SDL_FreeSurface(bmp);
 214 }