src/screen.cpp

   1 #include "common.h"
   2 #include "screen.h"
   3
   4 #include "gl_core44.h"
   5 #include <fcntl.h> // for access(2)
   6 #include <unistd.h> // for access(2)
   7
   8 #include "bufferbuilder.h"
   9 #include "shaderprogram.h"
  10
  11 #define BASICTEX_VERT "shaders/basictex_vert.glsl"
  12 #define BASICTEX_FRAG "shaders/basictex_frag.glsl"
  13
  14 using namespace IPDF;
  15 using namespace std;
  16
  17 static void opengl_debug_callback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* msg, const void *data)
  18 {
  19         // Don't print out gl Errors we generated.
  20         if (source == GL_DEBUG_SOURCE_APPLICATION) return;
  21         Error("OpenGL Error (%d): %s", id, msg);
  22 }
  23
  24
  25 Screen::Screen()
  26 {
  27
  28         SDL_Init(SDL_INIT_VIDEO);
  29         m_window = SDL_CreateWindow("IPDF", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
  30                         800, 600, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
  31
  32         if (!m_window)
  33         {
  34                 Fatal("Couldn't create window!");
  35         }
  36
  37         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
  38         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
  39         SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
  40         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
  41
  42         m_gl_context = SDL_GL_CreateContext(m_window);
  43
  44         ogl_LoadFunctions();
  45
  46         // Why is this so horribly broken?
  47         if (ogl_IsVersionGEQ(3,0))
  48         {
  49                 Fatal("We require OpenGL 3.1, but you have version %d.%d!",ogl_GetMajorVersion(), ogl_GetMinorVersion());
  50         }
  51
  52         if (!SDL_GL_ExtensionSupported("GL_ARB_shading_language_420pack"))
  53         {
  54                 Fatal("Your system does not support the ARB_shading_language_420pack extension, which is required.");
  55         }
  56
  57         if (!SDL_GL_ExtensionSupported("GL_ARB_explicit_attrib_location"))
  58         {
  59                 Fatal("Your system does not support the ARB_explicit_attrib_location extension, which is required.");
  60         }
  61
  62         m_frame_begin_time = SDL_GetPerformanceCounter();
  63         m_last_frame_time = 0;
  64         m_last_frame_gpu_timer = 0;
  65         glGenQueries(1, &m_frame_gpu_timer);
  66         glBeginQuery(GL_TIME_ELAPSED, m_frame_gpu_timer);
  67
  68         glDebugMessageCallback(opengl_debug_callback, 0);
  69
  70         GLuint default_vao;
  71         glGenVertexArrays(1, &default_vao);
  72         glBindVertexArray(default_vao);
  73
  74         m_texture_prog.InitialiseShaders(BASICTEX_VERT, BASICTEX_FRAG);
  75         m_texture_prog.Use();
  76
  77         // We always want to use the texture bound to texture unit 0.
  78         GLint texture_uniform_location = m_texture_prog.GetUniformLocation("tex");
  79         glUniform1i(texture_uniform_location, 0);
  80
  81         m_font_prog.InitialiseShaders(BASICTEX_VERT, "shaders/fonttex_frag.glsl");
  82         m_font_prog.Use();
  83
  84         // We always want to use the texture bound to texture unit 0.
  85         GLint font_texture_uniform_location = m_font_prog.GetUniformLocation("tex");
  86         glUniform1i(font_texture_uniform_location, 0);
  87         m_colour_uniform_location = m_font_prog.GetUniformLocation("colour");
  88
  89         m_viewport_ubo.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
  90         m_viewport_ubo.SetType(GraphicsBuffer::BufferTypeUniform);
  91
  92         m_debug_font_atlas = 0;
  93
  94         m_view = NULL;
  95         ResizeViewport(800, 600);
  96
  97         Clear();
  98         Present();
  99
 100
 101 }
 102
 103 Screen::~Screen()
 104 {
 105         SDL_GL_DeleteContext(m_gl_context);
 106         SDL_DestroyWindow(m_window);
 107         SDL_Quit();
 108 }
 109
 110 void Screen::Clear(float r, float g, float b, float a)
 111 {
 112         glClearColor(r,g,b,a);
 113         glClear(GL_COLOR_BUFFER_BIT);
 114         DebugFontClear();
 115 }
 116
 117 void Screen::ResizeViewport(int width, int height)
 118 {
 119         glViewport(0, 0, width, height);
 120         m_viewport_width = width;
 121         m_viewport_height = height;
 122         GLfloat viewportfloats[] = {(float)width, (float)height};
 123         m_viewport_ubo.Upload(sizeof(float)*2, viewportfloats);
 124 }
 125
 126 bool Screen::PumpEvents()
 127 {
 128         SDL_Event evt;
 129         bool no_quit_requested = true;
 130         while (SDL_PollEvent(&evt))
 131         {
 132                 switch (evt.type)
 133                 {
 134                 case SDL_QUIT:
 135                         no_quit_requested = false;
 136                         break;
 137                 case SDL_WINDOWEVENT:
 138                         switch (evt.window.event)
 139                         {
 140                         case SDL_WINDOWEVENT_RESIZED:
 141                         case SDL_WINDOWEVENT_SIZE_CHANGED:
 142                                 ResizeViewport(evt.window.data1, evt.window.data2);
 143                                 break;
 144                         }
 145                         break;
 146                 case SDL_MOUSEMOTION:
 147                         m_last_mouse_x = evt.motion.x;
 148                         m_last_mouse_y = evt.motion.y;
 149                         if (m_mouse_handler)
 150                         {
 151                                 m_mouse_handler(evt.motion.x, evt.motion.y,evt.motion.state, 0, this, m_view);
 152                         }
 153                         break;
 154                 case SDL_MOUSEBUTTONDOWN:
 155                 case SDL_MOUSEBUTTONUP:
 156                         m_last_mouse_x = evt.button.x;
 157                         m_last_mouse_y = evt.button.y;
 158                         if (m_mouse_handler)
 159                         {
 160                                 m_mouse_handler(evt.button.x, evt.button.y, evt.button.state?evt.button.button:0, 0, this, m_view);
 161                         }
 162                         break;
 163                 case SDL_MOUSEWHEEL:
 164                         if (m_mouse_handler)
 165                         {
 166                                 m_mouse_handler(m_last_mouse_x, m_last_mouse_y, 0, evt.wheel.y, this, m_view);
 167                         }
 168                         break;
 169                 case SDL_KEYDOWN:
 170                 {
 171                         Debug("Key %c down", (char)evt.key.keysym.sym);
 172                         if (isalnum((char)evt.key.keysym.sym))
 173                         {
 174                                 char filename[] = "0.bmp";
 175                                 filename[0] = (char)evt.key.keysym.sym;
 176                                 ScreenShot(filename);
 177                         }
 178                         break;
 179                 }
 180                 default:
 181                         break;
 182                 }
 183         }
 184         return no_quit_requested;
 185 }
 186
 187 void Screen::SetMouseCursor(Screen::MouseCursors cursor)
 188 {
 189         SDL_SystemCursor system_cursor_id = SDL_SYSTEM_CURSOR_ARROW;
 190         switch (cursor)
 191         {
 192         case CursorArrow: system_cursor_id = SDL_SYSTEM_CURSOR_ARROW; break;
 193         case CursorWait: system_cursor_id = SDL_SYSTEM_CURSOR_WAIT; break;
 194         case CursorWaitArrow: system_cursor_id = SDL_SYSTEM_CURSOR_WAITARROW; break;
 195         case CursorMove: system_cursor_id = SDL_SYSTEM_CURSOR_SIZEALL; break;
 196         case CursorHand: system_cursor_id = SDL_SYSTEM_CURSOR_HAND; break;
 197         default: break;
 198         }
 199         SDL_Cursor *system_cursor = SDL_CreateSystemCursor(system_cursor_id);
 200         SDL_SetCursor(system_cursor);
 201         //TODO: Check if we need to free the system cursors.
 202 }
 203
 204 void Screen::Present()
 205 {
 206         if (m_debug_font_atlas)
 207                 DebugFontFlush();
 208         m_last_frame_time = SDL_GetPerformanceCounter() - m_frame_begin_time;
 209         glEndQuery(GL_TIME_ELAPSED);
 210         SDL_GL_SwapWindow(m_window);
 211         m_frame_begin_time = SDL_GetPerformanceCounter();
 212         if (m_last_frame_gpu_timer)
 213                 glDeleteQueries(1, &m_last_frame_gpu_timer);
 214         m_last_frame_gpu_timer = m_frame_gpu_timer;
 215         glGenQueries(1, &m_frame_gpu_timer);
 216         glBeginQuery(GL_TIME_ELAPSED, m_frame_gpu_timer);
 217 }
 218
 219 double Screen::GetLastFrameTimeGPU() const
 220 {
 221         if (!m_last_frame_gpu_timer)
 222                 return 0;
 223         uint64_t frame_time_ns;
 224         glGetQueryObjectui64v(m_last_frame_gpu_timer, GL_QUERY_RESULT, &frame_time_ns);
 225         return frame_time_ns/1000000000.0;
 226 }
 227
 228 void Screen::RenderPixels(int x, int y, int w, int h, uint8_t *pixels) const
 229 {
 230         GLenum texture_format = GL_RGBA;
 231
 232         m_texture_prog.Use();
 233         GraphicsBuffer quad_vertex_buffer;
 234         quad_vertex_buffer.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
 235         quad_vertex_buffer.SetType(GraphicsBuffer::BufferTypeVertex);
 236         //rectangular texture == 2 triangles
 237         GLfloat quad[] = {
 238                 0, 0, (float)x, (float)y,
 239                 1, 0, (float)(x+w), (float)y,
 240                 0, 1, (float)x, (float)(y+h),
 241                 1, 1, (float)(x+w), (float)(y+h)
 242         };
 243         quad_vertex_buffer.Upload(sizeof(GLfloat) * 16, quad);
 244         quad_vertex_buffer.Bind();
 245         m_viewport_ubo.Bind();
 246
 247         glUniform4f(m_colour_uniform_location, 1.0f, 1.0f, 1.0f, 1.0f);
 248
 249         GLuint texID;
 250         glGenTextures(1, &texID);
 251         glBindTexture(GL_TEXTURE_2D, texID);
 252
 253         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 254         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 255         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 256         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 257
 258         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, texture_format, GL_UNSIGNED_BYTE, pixels);
 259
 260         glEnableVertexAttribArray(0);
 261         glEnableVertexAttribArray(1);
 262         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
 263         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
 264         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 265         glDisableVertexAttribArray(1);
 266         glDisableVertexAttribArray(0);
 267
 268 }
 269
 270 void Screen::ScreenShot(const char * filename) const
 271 {
 272         Debug("Attempting to save BMP to file %s", filename);
 273
 274         int w = ViewportWidth();
 275         int h = ViewportHeight();
 276         unsigned char * pixels = new unsigned char[w*h*4];
 277         if (pixels == NULL)
 278                 Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
 279
 280         for (int y = 0; y < h; ++y)
 281         {
 282                 glReadPixels(0,h-y-1,w, 1, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[y*w*4]);
 283         }
 284
 285 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 286         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0x000000ff,0x0000ff00,0x00ff0000,0xff000000);
 287 #else
 288         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
 289 #endif
 290         if (surf == NULL)
 291                 Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
 292
 293         GLenum texture_format = (surf->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 294         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);
 295
 296         if (SDL_SaveBMP(surf, filename) != 0)
 297                 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
 298
 299         SDL_FreeSurface(surf);
 300         delete [] pixels;
 301         Debug("Succeeded!");
 302 }
 303
 304 /**
 305  * Render a BMP
 306  * NOT PART OF THE DOCUMENT FORMAT
 307  */
 308 void Screen::RenderBMP(const char * filename) const
 309 {
 310         if (access(filename, R_OK) == -1)
 311         {
 312                 Error("No such file \"%s\" - Nothing to render - You might have done this deliberately?", filename);
 313                 return;
 314         }
 315         SDL_Surface * bmp = SDL_LoadBMP(filename);
 316         if (bmp == NULL)
 317                 Fatal("Failed to load BMP from %s - %s", filename, SDL_GetError());
 318
 319         int w = bmp->w;
 320         int h = bmp->h;
 321
 322         GLenum texture_format = GL_RGBA;
 323         switch (bmp->format->BytesPerPixel)
 324         {
 325                 case 4: //contains alpha
 326                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 327                         break;
 328                 case 3: //does not contain alpha
 329                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
 330                         break;
 331                 default:
 332                         Fatal("Could not understand SDL_Surface format (%d colours)", bmp->format->BytesPerPixel);
 333                         break;
 334         }
 335
 336         //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);
 337
 338         m_texture_prog.Use();
 339         GraphicsBuffer quad_vertex_buffer;
 340         quad_vertex_buffer.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
 341         quad_vertex_buffer.SetType(GraphicsBuffer::BufferTypeVertex);
 342         GLfloat quad[] = {
 343                 0, 0, 0, 0,
 344                 1, 0, (float)ViewportWidth(), 0,
 345                 1, 1, (float)ViewportWidth(), (float)ViewportHeight(),
 346                 0, 1, 0, (float)ViewportHeight()
 347         };
 348         quad_vertex_buffer.Upload(sizeof(GLfloat) * 16, quad);
 349         quad_vertex_buffer.Bind();
 350         m_viewport_ubo.Bind();
 351
 352         glUniform4f(m_colour_uniform_location, 1.0f, 1.0f, 1.0f, 1.0f);
 353
 354         GLuint texID;
 355         glGenTextures(1, &texID);
 356         glBindTexture(GL_TEXTURE_2D, texID);
 357
 358         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 359         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 360         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 361         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 362
 363         glTexImage2D(GL_TEXTURE_2D, 0, bmp->format->BytesPerPixel, w, h, 0, texture_format, GL_UNSIGNED_BYTE, bmp->pixels);
 364
 365         glEnableVertexAttribArray(0);
 366         glEnableVertexAttribArray(1);
 367         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
 368         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
 369         glDisableVertexAttribArray(1);
 370         glDisableVertexAttribArray(0);
 371         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 372
 373         SDL_FreeSurface(bmp);
 374 }
 375
 376 void Screen::DebugFontInit(const char *name, float font_size)
 377 {
 378         unsigned char font_atlas_data[1024*1024];
 379         FILE *font_file = fopen(name, "rb");
 380         fseek(font_file, 0, SEEK_END);
 381         size_t font_file_size = ftell(font_file);
 382         fseek(font_file, 0, SEEK_SET);
 383         unsigned char *font_file_data = (unsigned char*)malloc(font_file_size);
 384         SDL_assert(fread(font_file_data, 1, font_file_size, font_file) == font_file_size);
 385         fclose(font_file);
 386         stbtt_BakeFontBitmap(font_file_data,0, font_size, font_atlas_data,1024,1024, 32,96, m_debug_font_rects);
 387         free(font_file_data);
 388         glGenTextures(1, &m_debug_font_atlas);
 389         glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 390         glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, 1024,1024, 0, GL_RED, GL_UNSIGNED_BYTE, font_atlas_data);
 391         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 392         m_debug_font_size = font_size;
 393
 394         m_debug_font_vertices.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
 395         m_debug_font_vertices.SetType(GraphicsBuffer::BufferTypeVertex);
 396         m_debug_font_vertices.SetName("m_debug_font_vertices");
 397         m_debug_font_vertices.Upload(8192,NULL);
 398         m_debug_font_vertex_head = 0;
 399
 400         m_debug_font_indices.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
 401         m_debug_font_indices.SetType(GraphicsBuffer::BufferTypeIndex);
 402         m_debug_font_indices.SetName("m_debug_font_indices");
 403         m_debug_font_indices.Resize(500);
 404         m_debug_font_index_head = 0;
 405 }
 406
 407 void Screen::DebugFontClear()
 408 {
 409         m_debug_font_x = m_debug_font_y = 0;
 410         if (!m_debug_font_atlas) return;
 411         DebugFontPrint("\n");
 412 }
 413
 414 void Screen::DebugFontFlush()
 415 {
 416         glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 40, -1, "Screen::DebugFontFlush()");
 417
 418         glEnable(GL_BLEND);
 419         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 420         glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 421
 422         m_font_prog.Use();
 423         m_viewport_ubo.Bind();
 424         m_debug_font_vertices.Bind();
 425         m_debug_font_indices.Bind();
 426         glUniform4f(m_colour_uniform_location, 0,0,0,1);
 427         glEnableVertexAttribArray(0);
 428         glEnableVertexAttribArray(1);
 429         glEnable(GL_PRIMITIVE_RESTART);
 430         glPrimitiveRestartIndex(65535);
 431         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
 432         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
 433         glDrawElements(GL_TRIANGLE_STRIP, m_debug_font_index_head, GL_UNSIGNED_SHORT, 0);
 434         glDisable(GL_PRIMITIVE_RESTART);
 435         glDisableVertexAttribArray(1);
 436         glDisableVertexAttribArray(0);
 437
 438         glDisable(GL_BLEND);
 439
 440         m_debug_font_vertices.Invalidate();
 441         m_debug_font_indices.Invalidate();
 442         m_debug_font_vertex_head = 0;
 443         m_debug_font_index_head = 0;
 444
 445         glPopDebugGroup();
 446 }
 447
 448 struct fontvertex
 449 {
 450         float x, y, s, t;
 451 };
 452
 453 void Screen::DebugFontPrint(const char* str)
 454 {
 455         if (!m_debug_font_atlas) return;
 456
 457         glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 41, -1, "Screen::DebugFontPrint()");
 458
 459         BufferBuilder<fontvertex> vertexData(m_debug_font_vertices.MapRange(m_debug_font_vertex_head*sizeof(float), m_debug_font_vertices.GetSize() - m_debug_font_vertex_head*sizeof(float), false, true, true), m_debug_font_vertices.GetSize() - m_debug_font_vertex_head*sizeof(float));
 460         BufferBuilder<uint16_t> indexData(m_debug_font_indices.MapRange(m_debug_font_index_head*sizeof(uint16_t), m_debug_font_indices.GetSize() - m_debug_font_index_head*sizeof(uint16_t), false, true, true), m_debug_font_indices.GetSize() - m_debug_font_index_head*sizeof(uint16_t));
 461
 462         size_t baseVertex = m_debug_font_vertex_head/4;
 463         while (*str) {
 464                 if (!vertexData.Free(4) || !indexData.Free(5))
 465                 {
 466                         m_debug_font_indices.UnMap();
 467                         m_debug_font_vertices.UnMap();
 468                         DebugFontFlush();
 469                         DebugFontPrint(str);
 470                         glPopDebugGroup();
 471                         return;
 472                 }
 473                 if (*str >= 32 && (unsigned char)(*str) < 128) {
 474                         stbtt_aligned_quad q;
 475                         stbtt_GetBakedQuad(m_debug_font_rects, 1024,1024, *str-32, &m_debug_font_x,&m_debug_font_y,&q,1);
 476                         size_t index = vertexData.Add({q.x0, q.y0, q.s0, q.t0});
 477                         index += baseVertex;
 478                         indexData.Add(index);
 479                         index = vertexData.Add({q.x1, q.y0, q.s1, q.t0});
 480                         index += baseVertex;
 481                         indexData.Add(index);
 482                         index = vertexData.Add({q.x0, q.y1, q.s0, q.t1});
 483                         index += baseVertex;
 484                         indexData.Add(index);
 485                         index = vertexData.Add({q.x1, q.y1, q.s1, q.t1});
 486                         index += baseVertex;
 487                         indexData.Add(index);
 488                         indexData.Add(65535);
 489
 490                         m_debug_font_vertex_head += 16;
 491                         m_debug_font_index_head += 5;
 492
 493                 }
 494                 else if (*str == '\n')
 495                 {
 496                         m_debug_font_x = 0;
 497                         m_debug_font_y += m_debug_font_size;
 498                 }
 499                 ++str;
 500         }
 501         m_debug_font_indices.UnMap();
 502         m_debug_font_vertices.UnMap();
 503         glPopDebugGroup();
 504         //DebugFontFlush();
 505 }
 506
 507 void Screen::DebugFontPrintF(const char *fmt, ...)
 508 {
 509         char buffer[BUFSIZ];
 510         va_list va;
 511         va_start(va, fmt);
 512         vsnprintf(buffer, BUFSIZ, fmt,va);
 513         va_end(va);
 514         DebugFontPrint(buffer);
 515 }