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         ResizeViewport(800, 600);
  23
  24         Clear();
  25         Present();
  26
  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::Clear(float r, float g, float b, float a)
  38 {
  39         glClearColor(r,g,b,a);
  40         glClear(GL_COLOR_BUFFER_BIT);
  41         DebugFontClear();
  42 }
  43
  44 void Screen::ResizeViewport(int width, int height)
  45 {
  46         glViewport(0, 0, width, height);
  47         m_viewport_width = width;
  48         m_viewport_height = height;
  49 }
  50
  51 bool Screen::PumpEvents()
  52 {
  53         SDL_Event evt;
  54         bool no_quit_requested = true;
  55         while (SDL_PollEvent(&evt))
  56         {
  57                 switch (evt.type)
  58                 {
  59                 case SDL_QUIT:
  60                         no_quit_requested = false;
  61                         break;
  62                 case SDL_WINDOWEVENT:
  63                         switch (evt.window.event)
  64                         {
  65                         case SDL_WINDOWEVENT_RESIZED:
  66                         case SDL_WINDOWEVENT_SIZE_CHANGED:
  67                                 ResizeViewport(evt.window.data1, evt.window.data2);
  68                                 break;
  69                         }
  70                         break;
  71                 case SDL_MOUSEMOTION:
  72                         m_last_mouse_x = evt.motion.x;
  73                         m_last_mouse_y = evt.motion.y;
  74                         if (m_mouse_handler)
  75                         {
  76                                 m_mouse_handler(evt.motion.x, evt.motion.y,evt.motion.state, 0);
  77                         }
  78                         break;
  79                 case SDL_MOUSEBUTTONDOWN:
  80                 case SDL_MOUSEBUTTONUP:
  81                         m_last_mouse_x = evt.button.x;
  82                         m_last_mouse_y = evt.button.y;
  83                         if (m_mouse_handler)
  84                         {
  85                                 m_mouse_handler(evt.button.x, evt.button.y, evt.button.state?evt.button.button:0, 0);
  86                         }
  87                         break;
  88                 case SDL_MOUSEWHEEL:
  89                         if (m_mouse_handler)
  90                         {
  91                                 m_mouse_handler(m_last_mouse_x, m_last_mouse_y, 0, evt.wheel.y);
  92                         }
  93                         break;
  94                 case SDL_KEYDOWN:
  95                 {
  96                         Debug("Key %c down", (char)evt.key.keysym.sym);
  97                         if (isalnum((char)evt.key.keysym.sym))
  98                         {
  99                                 char filename[] = "0.bmp";
 100                                 filename[0] = (char)evt.key.keysym.sym;
 101                                 ScreenShot(filename);
 102                         }
 103                         break;
 104                 }
 105                 default:
 106                         break;
 107                 }
 108         }
 109         return no_quit_requested;
 110 }
 111
 112 void Screen::SetMouseCursor(Screen::MouseCursors cursor)
 113 {
 114         SDL_SystemCursor system_cursor_id = SDL_SYSTEM_CURSOR_ARROW;
 115         switch (cursor)
 116         {
 117         case CursorArrow: system_cursor_id = SDL_SYSTEM_CURSOR_ARROW; break;
 118         case CursorWait: system_cursor_id = SDL_SYSTEM_CURSOR_WAIT; break;
 119         case CursorWaitArrow: system_cursor_id = SDL_SYSTEM_CURSOR_WAITARROW; break;
 120         case CursorMove: system_cursor_id = SDL_SYSTEM_CURSOR_SIZEALL; break;
 121         case CursorHand: system_cursor_id = SDL_SYSTEM_CURSOR_HAND; break;
 122         default: break;
 123         }
 124         SDL_Cursor *system_cursor = SDL_CreateSystemCursor(system_cursor_id);
 125         SDL_SetCursor(system_cursor);
 126         //TODO: Check if we need to free the system cursors.
 127 }
 128
 129 void Screen::Present()
 130 {
 131         SDL_GL_SwapWindow(m_window);
 132 }
 133
 134 void Screen::ScreenShot(const char * filename) const
 135 {
 136         Debug("Attempting to save BMP to file %s", filename);
 137
 138         int w = ViewportWidth();
 139         int h = ViewportHeight();
 140         unsigned char * pixels = new unsigned char[w*h*4];
 141         if (pixels == NULL)
 142                 Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
 143         glReadBuffer(GL_FRONT);
 144         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 145         for (int y = 0; y < h; ++y)
 146         {
 147                 glReadPixels(0,h-y-1,w, 1, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[y*w*4]);
 148         }
 149
 150 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 151         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0x000000ff,0x0000ff00,0x00ff0000,0xff000000);
 152 #else
 153         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
 154 #endif
 155         if (surf == NULL)
 156                 Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
 157
 158         GLenum texture_format = (surf->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 159         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);
 160
 161         if (SDL_SaveBMP(surf, filename) != 0)
 162                 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
 163
 164         SDL_FreeSurface(surf);
 165         delete [] pixels;
 166         Debug("Succeeded!");
 167 }
 168
 169 /**
 170  * Render a BMP
 171  * NOT PART OF THE DOCUMENT FORMAT
 172  */
 173 void Screen::RenderBMP(const char * filename) const
 174 {
 175         SDL_Surface * bmp = SDL_LoadBMP(filename);
 176         if (bmp == NULL)
 177                 Fatal("Failed to load BMP from %s - %s", filename, SDL_GetError());
 178
 179         int w = bmp->w;
 180         int h = bmp->h;
 181
 182         GLenum texture_format;
 183         switch (bmp->format->BytesPerPixel)
 184         {
 185                 case 4: //contains alpha
 186                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 187                         break;
 188                 case 3: //does not contain alpha
 189                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
 190                         break;
 191                 default:
 192                         Fatal("Could not understand SDL_Surface format (%d colours)", bmp->format->BytesPerPixel);
 193                         break;
 194         }
 195
 196         //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);
 197
 198
 199         GLuint texID;
 200         glEnable(GL_TEXTURE_2D);
 201         glGenTextures(1, &texID);
 202         glBindTexture(GL_TEXTURE_2D, texID);
 203
 204         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 205         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 206         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 207         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 208
 209         glTexImage2D(GL_TEXTURE_2D, 0, bmp->format->BytesPerPixel, w, h, 0, texture_format, GL_UNSIGNED_BYTE, bmp->pixels);
 210
 211         glMatrixMode(GL_PROJECTION);
 212         glLoadIdentity();
 213         glOrtho(0.0, 1.0, 1.0, 0.0, -1.f, 1.f);
 214         glMatrixMode(GL_MODELVIEW);
 215         glLoadIdentity();
 216
 217         glBegin(GL_QUADS);
 218                 glTexCoord2i(0,0); glVertex2f(0,0);
 219                 glTexCoord2i(1,0); glVertex2f(1,0);
 220                 glTexCoord2i(1,1); glVertex2f(1,1);
 221                 glTexCoord2i(0,1); glVertex2f(0,1);
 222         glEnd();
 223
 224         glDisable(GL_TEXTURE_2D);
 225         SDL_FreeSurface(bmp);
 226 }
 227
 228 void Screen::DebugFontInit(const char *name, float font_size)
 229 {
 230         unsigned char font_atlas_data[1024*1024];
 231         FILE *font_file = fopen(name, "rb");
 232         fseek(font_file, 0, SEEK_END);
 233         size_t font_file_size = ftell(font_file);
 234         fseek(font_file, 0, SEEK_SET);
 235         unsigned char *font_file_data = (unsigned char*)malloc(font_file_size);
 236         fread(font_file_data, 1, font_file_size, font_file);
 237         fclose(font_file);
 238         stbtt_BakeFontBitmap(font_file_data,0, font_size, font_atlas_data,1024,1024, 32,96, m_debug_font_rects);
 239         free(font_file_data);
 240         glGenTextures(1, &m_debug_font_atlas);
 241         glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 242         glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 1024,1024, 0, GL_ALPHA, GL_UNSIGNED_BYTE, font_atlas_data);
 243         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 244         m_debug_font_size = font_size;
 245 }
 246
 247 void Screen::DebugFontClear()
 248 {
 249         m_debug_font_x = m_debug_font_y = 0;
 250         DebugFontPrint("\n");
 251 }
 252
 253 void Screen::DebugFontPrint(const char* str)
 254 {
 255         glMatrixMode(GL_PROJECTION);
 256         glPushMatrix();
 257         glLoadIdentity();
 258         glOrtho(0,ViewportWidth(), ViewportHeight(), 0, -1, 1);
 259         glMatrixMode(GL_MODELVIEW);
 260         glPushMatrix();
 261         glLoadIdentity();
 262
 263
 264
 265         glEnable(GL_TEXTURE_2D);
 266         glEnable(GL_BLEND);
 267         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 268         glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 269         glBegin(GL_QUADS);
 270         while (*str) {
 271                 if (*str >= 32 && *str < 128) {
 272                         stbtt_aligned_quad q;
 273                         stbtt_GetBakedQuad(m_debug_font_rects, 1024,1024, *str-32, &m_debug_font_x,&m_debug_font_y,&q,1);
 274                         glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0);
 275                         glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0);
 276                         glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1);
 277                         glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1);
 278                 }
 279                 else if (*str == '\n')
 280                 {
 281                         m_debug_font_x = 0;
 282                         m_debug_font_y += m_debug_font_size;
 283                 }
 284                 ++str;
 285         }
 286         glEnd();
 287         glDisable(GL_BLEND);
 288         glDisable(GL_TEXTURE_2D);
 289         glPopMatrix();
 290         glMatrixMode(GL_MODELVIEW);
 291         glPopMatrix();
 292 }
 293
 294 void Screen::DebugFontPrintF(const char *fmt, ...)
 295 {
 296         char buffer[BUFSIZ];
 297         va_list va;
 298         va_start(va, fmt);
 299         vsnprintf(buffer, BUFSIZ, fmt,va);
 300         va_end(va);
 301         DebugFontPrint(buffer);
 302 }