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 "shaderprogram.h"
   9
  10 #define BASICTEX_VERT \
  11         "#version 140\n"\
  12         "#extension GL_ARB_shading_language_420pack : require\n"\
  13         "#extension GL_ARB_explicit_attrib_location : require\n"\
  14         "\n"\
  15         "layout(std140, binding=0) uniform Viewport\n"\
  16         "{\n"\
  17         "\tfloat width;\n"\
  18         "\tfloat height;\n"\
  19         "};\n"\
  20         "\n"\
  21         "layout(location = 0) in vec2 position;\n"\
  22         "layout(location = 1) in vec2 tex_coord;\n"\
  23         "\n"\
  24         "out vec2 fp_tex_coord;\n"\
  25         "\n"\
  26         "void main()\n"\
  27         "{\n"\
  28         "\t// Transform to clip coordinates (-1,1, -1,1).\n"\
  29         "\tgl_Position.x = (position.x*2/width) - 1;\n"\
  30         "\tgl_Position.y = 1 - (position.y*2/height);\n"\
  31         "\tgl_Position.z = 0.0;\n"\
  32         "\tgl_Position.w = 1.0;\n"\
  33         "\tfp_tex_coord = tex_coord;\n"\
  34         "}\n"
  35
  36 #define BASICTEX_FRAG \
  37         "#version 140\n"\
  38         "\n"\
  39         "in vec2 fp_tex_coord;\n"\
  40         "\n"\
  41         "out vec4 output_colour;\n"\
  42         "\n"\
  43         "uniform sampler2D tex;\n"\
  44         "uniform vec4 colour;\n"\
  45         "\n"\
  46         "void main()\n"\
  47         "{\n"\
  48         "\toutput_colour = colour;\n"\
  49         "\toutput_colour.a = texture(tex, fp_tex_coord).r;\n"\
  50         "}\n"
  51
  52 using namespace IPDF;
  53 using namespace std;
  54
  55 static void opengl_debug_callback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* msg, const void *data)
  56 {
  57         Error("OpenGL Error (%d): %s", id, msg);
  58 }
  59
  60
  61 Screen::Screen()
  62 {
  63         SDL_Init(SDL_INIT_VIDEO);
  64         m_window = SDL_CreateWindow("IPDF", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
  65                         800, 600, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
  66
  67         if (!m_window)
  68         {
  69                 Fatal("Couldn't create window!");
  70         }
  71
  72         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
  73         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
  74         SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
  75         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
  76
  77         m_gl_context = SDL_GL_CreateContext(m_window);
  78
  79         ogl_LoadFunctions();
  80
  81         // Why is this so horribly broken?
  82         if (ogl_IsVersionGEQ(3,0))
  83         {
  84                 Fatal("We require OpenGL 3.1, but you have version %d.%d!",ogl_GetMajorVersion(), ogl_GetMinorVersion());
  85         }
  86
  87         if (!SDL_GL_ExtensionSupported("GL_ARB_shading_language_420pack"))
  88         {
  89                 Fatal("Your system does not support the ARB_shading_language_420pack extension, which is required.");
  90         }
  91
  92         if (!SDL_GL_ExtensionSupported("GL_ARB_explicit_attrib_location"))
  93         {
  94                 Fatal("Your system does not support the ARB_explicit_attrib_location extension, which is required.");
  95         }
  96
  97         m_frame_begin_time = SDL_GetPerformanceCounter();
  98         m_last_frame_time = 0;
  99         m_last_frame_gpu_timer = 0;
 100         glGenQueries(1, &m_frame_gpu_timer);
 101         glBeginQuery(GL_TIME_ELAPSED, m_frame_gpu_timer);
 102
 103         glDebugMessageCallback(opengl_debug_callback, 0);
 104
 105         GLuint default_vao;
 106         glGenVertexArrays(1, &default_vao);
 107         glBindVertexArray(default_vao);
 108
 109         //TODO: Error checking.
 110         m_texture_prog.AttachVertexProgram(BASICTEX_VERT);
 111         m_texture_prog.AttachFragmentProgram(BASICTEX_FRAG);
 112         m_texture_prog.Link();
 113         m_texture_prog.Use();
 114
 115         // We always want to use the texture bound to texture unit 0.
 116         GLint texture_uniform_location = m_texture_prog.GetUniformLocation("tex");
 117         glUniform1i(texture_uniform_location, 0);
 118
 119         m_colour_uniform_location = m_texture_prog.GetUniformLocation("colour");
 120
 121         m_viewport_ubo.SetUsage(GraphicsBuffer::BufferUsageDynamicDraw);
 122         m_viewport_ubo.SetType(GraphicsBuffer::BufferTypeUniform);
 123
 124         m_debug_font_atlas = 0;
 125
 126         ResizeViewport(800, 600);
 127
 128         Clear();
 129         Present();
 130
 131
 132 }
 133
 134 Screen::~Screen()
 135 {
 136         SDL_GL_DeleteContext(m_gl_context);
 137         SDL_DestroyWindow(m_window);
 138         SDL_Quit();
 139 }
 140
 141 void Screen::Clear(float r, float g, float b, float a)
 142 {
 143         glClearColor(r,g,b,a);
 144         glClear(GL_COLOR_BUFFER_BIT);
 145         DebugFontClear();
 146 }
 147
 148 void Screen::ResizeViewport(int width, int height)
 149 {
 150         glViewport(0, 0, width, height);
 151         m_viewport_width = width;
 152         m_viewport_height = height;
 153         GLfloat viewportfloats[] = {(float)width, (float)height};
 154         m_viewport_ubo.Upload(sizeof(float)*2, viewportfloats);
 155 }
 156
 157 bool Screen::PumpEvents()
 158 {
 159         SDL_Event evt;
 160         bool no_quit_requested = true;
 161         while (SDL_PollEvent(&evt))
 162         {
 163                 switch (evt.type)
 164                 {
 165                 case SDL_QUIT:
 166                         no_quit_requested = false;
 167                         break;
 168                 case SDL_WINDOWEVENT:
 169                         switch (evt.window.event)
 170                         {
 171                         case SDL_WINDOWEVENT_RESIZED:
 172                         case SDL_WINDOWEVENT_SIZE_CHANGED:
 173                                 ResizeViewport(evt.window.data1, evt.window.data2);
 174                                 break;
 175                         }
 176                         break;
 177                 case SDL_MOUSEMOTION:
 178                         m_last_mouse_x = evt.motion.x;
 179                         m_last_mouse_y = evt.motion.y;
 180                         if (m_mouse_handler)
 181                         {
 182                                 m_mouse_handler(evt.motion.x, evt.motion.y,evt.motion.state, 0);
 183                         }
 184                         break;
 185                 case SDL_MOUSEBUTTONDOWN:
 186                 case SDL_MOUSEBUTTONUP:
 187                         m_last_mouse_x = evt.button.x;
 188                         m_last_mouse_y = evt.button.y;
 189                         if (m_mouse_handler)
 190                         {
 191                                 m_mouse_handler(evt.button.x, evt.button.y, evt.button.state?evt.button.button:0, 0);
 192                         }
 193                         break;
 194                 case SDL_MOUSEWHEEL:
 195                         if (m_mouse_handler)
 196                         {
 197                                 m_mouse_handler(m_last_mouse_x, m_last_mouse_y, 0, evt.wheel.y);
 198                         }
 199                         break;
 200                 case SDL_KEYDOWN:
 201                 {
 202                         Debug("Key %c down", (char)evt.key.keysym.sym);
 203                         if (isalnum((char)evt.key.keysym.sym))
 204                         {
 205                                 char filename[] = "0.bmp";
 206                                 filename[0] = (char)evt.key.keysym.sym;
 207                                 ScreenShot(filename);
 208                         }
 209                         break;
 210                 }
 211                 default:
 212                         break;
 213                 }
 214         }
 215         return no_quit_requested;
 216 }
 217
 218 void Screen::SetMouseCursor(Screen::MouseCursors cursor)
 219 {
 220         SDL_SystemCursor system_cursor_id = SDL_SYSTEM_CURSOR_ARROW;
 221         switch (cursor)
 222         {
 223         case CursorArrow: system_cursor_id = SDL_SYSTEM_CURSOR_ARROW; break;
 224         case CursorWait: system_cursor_id = SDL_SYSTEM_CURSOR_WAIT; break;
 225         case CursorWaitArrow: system_cursor_id = SDL_SYSTEM_CURSOR_WAITARROW; break;
 226         case CursorMove: system_cursor_id = SDL_SYSTEM_CURSOR_SIZEALL; break;
 227         case CursorHand: system_cursor_id = SDL_SYSTEM_CURSOR_HAND; break;
 228         default: break;
 229         }
 230         SDL_Cursor *system_cursor = SDL_CreateSystemCursor(system_cursor_id);
 231         SDL_SetCursor(system_cursor);
 232         //TODO: Check if we need to free the system cursors.
 233 }
 234
 235 void Screen::Present()
 236 {
 237         if (m_debug_font_atlas)
 238                 DebugFontFlush();
 239         m_last_frame_time = SDL_GetPerformanceCounter() - m_frame_begin_time;
 240         glEndQuery(GL_TIME_ELAPSED);
 241         SDL_GL_SwapWindow(m_window);
 242         m_frame_begin_time = SDL_GetPerformanceCounter();
 243         if (m_last_frame_gpu_timer)
 244                 glDeleteQueries(1, &m_last_frame_gpu_timer);
 245         m_last_frame_gpu_timer = m_frame_gpu_timer;
 246         glGenQueries(1, &m_frame_gpu_timer);
 247         glBeginQuery(GL_TIME_ELAPSED, m_frame_gpu_timer);
 248 }
 249
 250 double Screen::GetLastFrameTimeGPU() const
 251 {
 252         if (!m_last_frame_gpu_timer)
 253                 return 0;
 254         uint64_t frame_time_ns;
 255         glGetQueryObjectui64v(m_last_frame_gpu_timer, GL_QUERY_RESULT, &frame_time_ns);
 256         return frame_time_ns/1000000000.0;
 257 }
 258
 259 void Screen::ScreenShot(const char * filename) const
 260 {
 261         Debug("Attempting to save BMP to file %s", filename);
 262
 263         int w = ViewportWidth();
 264         int h = ViewportHeight();
 265         unsigned char * pixels = new unsigned char[w*h*4];
 266         if (pixels == NULL)
 267                 Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
 268
 269         for (int y = 0; y < h; ++y)
 270         {
 271                 glReadPixels(0,h-y-1,w, 1, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[y*w*4]);
 272         }
 273
 274 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
 275         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0x000000ff,0x0000ff00,0x00ff0000,0xff000000);
 276 #else
 277         SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
 278 #endif
 279         if (surf == NULL)
 280                 Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
 281
 282         GLenum texture_format = (surf->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 283         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);
 284
 285         if (SDL_SaveBMP(surf, filename) != 0)
 286                 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
 287
 288         SDL_FreeSurface(surf);
 289         delete [] pixels;
 290         Debug("Succeeded!");
 291 }
 292
 293 /**
 294  * Render a BMP
 295  * NOT PART OF THE DOCUMENT FORMAT
 296  */
 297 void Screen::RenderBMP(const char * filename) const
 298 {
 299         if (access(filename, R_OK) == -1)
 300         {
 301                 Error("No such file \"%s\" - Nothing to render - You might have done this deliberately?", filename);
 302                 return;
 303         }
 304         SDL_Surface * bmp = SDL_LoadBMP(filename);
 305         if (bmp == NULL)
 306                 Fatal("Failed to load BMP from %s - %s", filename, SDL_GetError());
 307
 308         int w = bmp->w;
 309         int h = bmp->h;
 310
 311         GLenum texture_format;
 312         switch (bmp->format->BytesPerPixel)
 313         {
 314                 case 4: //contains alpha
 315                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
 316                         break;
 317                 case 3: //does not contain alpha
 318                         texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
 319                         break;
 320                 default:
 321                         Fatal("Could not understand SDL_Surface format (%d colours)", bmp->format->BytesPerPixel);
 322                         break;
 323         }
 324
 325         //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);
 326
 327         m_texture_prog.Use();
 328         GraphicsBuffer quad_vertex_buffer;
 329         quad_vertex_buffer.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
 330         quad_vertex_buffer.SetType(GraphicsBuffer::BufferTypeVertex);
 331         GLfloat quad[] = {
 332                 0, 0, 0, 0,
 333                 1, 0, ViewportWidth(), 0,
 334                 1, 1, ViewportWidth(), ViewportHeight(),
 335                 0, 1, 0, ViewportHeight()
 336         };
 337         quad_vertex_buffer.Upload(sizeof(GLfloat) * 16, quad);
 338         quad_vertex_buffer.Bind();
 339         m_viewport_ubo.Bind();
 340
 341         glUniform4f(m_colour_uniform_location, 1.0f, 1.0f, 1.0f, 1.0f);
 342
 343         GLuint texID;
 344         glGenTextures(1, &texID);
 345         glBindTexture(GL_TEXTURE_2D, texID);
 346
 347         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 348         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 349         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 350         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 351
 352         glTexImage2D(GL_TEXTURE_2D, 0, bmp->format->BytesPerPixel, w, h, 0, texture_format, GL_UNSIGNED_BYTE, bmp->pixels);
 353
 354         glEnableVertexAttribArray(0);
 355         glEnableVertexAttribArray(1);
 356         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
 357         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
 358         glDisableVertexAttribArray(1);
 359         glDisableVertexAttribArray(0);
 360         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 361
 362         SDL_FreeSurface(bmp);
 363 }
 364
 365 void Screen::DebugFontInit(const char *name, float font_size)
 366 {
 367         unsigned char font_atlas_data[1024*1024];
 368         FILE *font_file = fopen(name, "rb");
 369         fseek(font_file, 0, SEEK_END);
 370         size_t font_file_size = ftell(font_file);
 371         fseek(font_file, 0, SEEK_SET);
 372         unsigned char *font_file_data = (unsigned char*)malloc(font_file_size);
 373         fread(font_file_data, 1, font_file_size, font_file);
 374         fclose(font_file);
 375         stbtt_BakeFontBitmap(font_file_data,0, font_size, font_atlas_data,1024,1024, 32,96, m_debug_font_rects);
 376         free(font_file_data);
 377         glGenTextures(1, &m_debug_font_atlas);
 378         glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 379         glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, 1024,1024, 0, GL_RED, GL_UNSIGNED_BYTE, font_atlas_data);
 380         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 381         m_debug_font_size = font_size;
 382
 383         m_debug_font_vertices.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
 384         m_debug_font_vertices.SetType(GraphicsBuffer::BufferTypeVertex);
 385         m_debug_font_vertices.Upload(8192, nullptr);
 386         m_debug_font_vertex_head = 0;
 387
 388         m_debug_font_indices.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
 389         m_debug_font_indices.SetType(GraphicsBuffer::BufferTypeIndex);
 390         m_debug_font_indices.Resize(500);
 391         m_debug_font_index_head = 0;
 392 }
 393
 394 void Screen::DebugFontClear()
 395 {
 396         m_debug_font_x = m_debug_font_y = 0;
 397         if (!m_debug_font_atlas) return;
 398         DebugFontPrint("\n");
 399 }
 400
 401 void Screen::DebugFontFlush()
 402 {
 403
 404
 405         glEnable(GL_BLEND);
 406         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 407         glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
 408
 409         m_texture_prog.Use();
 410         m_viewport_ubo.Bind();
 411         m_debug_font_vertices.Bind();
 412         m_debug_font_indices.Bind();
 413         glUniform4f(m_colour_uniform_location, 0,0,0,1);
 414         glEnableVertexAttribArray(0);
 415         glEnableVertexAttribArray(1);
 416         glEnable(GL_PRIMITIVE_RESTART);
 417         glPrimitiveRestartIndex(65535);
 418         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
 419         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
 420         glDrawElements(GL_TRIANGLE_STRIP, m_debug_font_index_head, GL_UNSIGNED_SHORT, 0);
 421         glDisable(GL_PRIMITIVE_RESTART);
 422         glDisableVertexAttribArray(1);
 423         glDisableVertexAttribArray(0);
 424
 425         glDisable(GL_BLEND);
 426
 427         m_debug_font_vertex_head = 0;
 428         m_debug_font_index_head = 0;
 429 }
 430
 431 void Screen::DebugFontPrint(const char* str)
 432 {
 433         if (!m_debug_font_atlas) return;
 434
 435         float *vertexData = (float*)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);
 436         uint16_t *indexData = (uint16_t*)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);
 437         while (*str) {
 438                 if ((m_debug_font_vertex_head*sizeof(float) + 16*sizeof(float) >= m_debug_font_vertices.GetSize() ) ||
 439                         (m_debug_font_index_head*sizeof(uint16_t) + 5*sizeof(uint16_t) >= m_debug_font_indices.GetSize()))
 440                 {
 441                         m_debug_font_indices.UnMap();
 442                         m_debug_font_vertices.UnMap();
 443                         DebugFontFlush();
 444                         DebugFontPrint(str);
 445                         return;
 446                 }
 447                 if (*str >= 32 && *str < 128) {
 448                         stbtt_aligned_quad q;
 449                         stbtt_GetBakedQuad(m_debug_font_rects, 1024,1024, *str-32, &m_debug_font_x,&m_debug_font_y,&q,1);
 450                         *vertexData = q.s0; vertexData++;
 451                         *vertexData = q.t0; vertexData++;
 452                         *vertexData = q.x0; vertexData++;
 453                         *vertexData = q.y0; vertexData++;
 454                         *vertexData = q.s1; vertexData++;
 455                         *vertexData = q.t0; vertexData++;
 456                         *vertexData = q.x1; vertexData++;
 457                         *vertexData = q.y0; vertexData++;
 458                         *vertexData = q.s1; vertexData++;
 459                         *vertexData = q.t1; vertexData++;
 460                         *vertexData = q.x1; vertexData++;
 461                         *vertexData = q.y1; vertexData++;
 462                         *vertexData = q.s0; vertexData++;
 463                         *vertexData = q.t1; vertexData++;
 464                         *vertexData = q.x0; vertexData++;
 465                         *vertexData = q.y1; vertexData++;
 466
 467                         *indexData = m_debug_font_vertex_head/4; indexData++;
 468                         *indexData = m_debug_font_vertex_head/4+1; indexData++;
 469                         *indexData = m_debug_font_vertex_head/4+3; indexData++;
 470                         *indexData = m_debug_font_vertex_head/4+2; indexData++;
 471                         *indexData = 65535; indexData++;
 472
 473                         m_debug_font_vertex_head += 16;
 474                         m_debug_font_index_head += 5;
 475
 476                 }
 477                 else if (*str == '\n')
 478                 {
 479                         m_debug_font_x = 0;
 480                         m_debug_font_y += m_debug_font_size;
 481                 }
 482                 ++str;
 483         }
 484         m_debug_font_indices.UnMap();
 485         m_debug_font_vertices.UnMap();
 486         //DebugFontFlush();
 487 }
 488
 489 void Screen::DebugFontPrintF(const char *fmt, ...)
 490 {
 491         char buffer[BUFSIZ];
 492         va_list va;
 493         va_start(va, fmt);
 494         vsnprintf(buffer, BUFSIZ, fmt,va);
 495         va_end(va);
 496         DebugFontPrint(buffer);
 497 }