src/graphics/gropengl.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 #include "SDL_opengl.h"
  10
  11 #include "pstypes.h"
  12 #include "osregistry.h"
  13 #include "gropengl.h"
  14 #include "gropenglinternal.h"
  15 #include "grgl1.h"
  16 #include "grgl2.h"
  17 #include "2d.h"
  18 #include "bmpman.h"
  19 #include "grinternal.h"
  20 #include "cmdline.h"
  21 #include "mouse.h"
  22 #include "osapi.h"
  23 #include "cfile.h"
  24
  25
  26 bool OGL_inited = false;
  27 int GL_version = 0;
  28
  29 SDL_Window *GL_window = NULL;
  30 SDL_GLContext GL_context;
  31
  32 volatile int GL_activate = 0;
  33 volatile int GL_deactivate = 0;
  34
  35 int GL_viewport_x = 0;
  36 int GL_viewport_y = 0;
  37 int GL_viewport_w = 640;
  38 int GL_viewport_h = 480;
  39 float GL_viewport_scale_w = 1.0f;
  40 float GL_viewport_scale_h = 1.0f;
  41 int GL_min_texture_width = 0;
  42 int GL_max_texture_width = 0;
  43 int GL_min_texture_height = 0;
  44 int GL_max_texture_height = 0;
  45
  46 rb_t *render_buffer = NULL;
  47 static size_t render_buffer_size = 0;
  48
  49
  50 void opengl_alloc_render_buffer(unsigned int nelems)
  51 {
  52         if (nelems < 1) {
  53                 nelems = 1;
  54         }
  55
  56         if ( render_buffer && (nelems <= render_buffer_size) ) {
  57                 return;
  58         }
  59
  60         if (render_buffer) {
  61                 free(render_buffer);
  62         }
  63
  64         render_buffer = (rb_t*) malloc(sizeof(rb_t) * nelems);
  65         render_buffer_size = nelems;
  66 }
  67
  68 void opengl_free_render_buffer()
  69 {
  70         if (render_buffer) {
  71                 free(render_buffer);
  72                 render_buffer = NULL;
  73                 render_buffer_size = 0;
  74         }
  75 }
  76
  77 void opengl_set_variables()
  78 {
  79         GL_min_texture_height = 16;
  80         GL_min_texture_width = 16;
  81
  82         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
  83         GL_max_texture_height = GL_max_texture_width;
  84
  85         // no texture is larger than 1024, so maybe don't use sections
  86         if (GL_max_texture_width >= 1024) {
  87                 gr_screen.use_sections = 0;
  88         }
  89 }
  90
  91 void opengl_init_viewport()
  92 {
  93         GL_viewport_x = 0;
  94         GL_viewport_y = 0;
  95         GL_viewport_w = gr_screen.max_w;
  96         GL_viewport_h = gr_screen.max_h;
  97         GL_viewport_scale_w = 1.0f;
  98         GL_viewport_scale_h = 1.0f;
  99
 100         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 101 }
 102
 103 void gr_opengl_force_windowed()
 104 {
 105         SDL_SetWindowFullscreen(GL_window, 0);
 106 }
 107
 108 void gr_opengl_force_fullscreen()
 109 {
 110         SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 111 }
 112
 113 void gr_opengl_toggle_fullscreen()
 114 {
 115         Uint32 flags = SDL_GetWindowFlags(GL_window);
 116
 117         if ( (flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP ) {
 118                 gr_opengl_force_windowed();
 119         } else {
 120                 gr_opengl_force_fullscreen();
 121         }
 122 }
 123
 124 void gr_opengl_clear()
 125 {
 126         glClearColor(gr_screen.current_clear_color.red / 255.0f,
 127                 gr_screen.current_clear_color.green / 255.0f,
 128                 gr_screen.current_clear_color.blue / 255.0f, 1.0f);
 129
 130         glClear( GL_COLOR_BUFFER_BIT );
 131 }
 132
 133 void gr_opengl_reset_clip()
 134 {
 135         gr_screen.offset_x = 0;
 136         gr_screen.offset_y = 0;
 137         gr_screen.clip_left = 0;
 138         gr_screen.clip_top = 0;
 139         gr_screen.clip_right = gr_screen.max_w - 1;
 140         gr_screen.clip_bottom = gr_screen.max_h - 1;
 141         gr_screen.clip_width = gr_screen.max_w;
 142         gr_screen.clip_height = gr_screen.max_h;
 143
 144         glDisable(GL_SCISSOR_TEST);
 145 }
 146
 147 void gr_opengl_print_screen(const char *filename)
 148 {
 149         char tmp[MAX_FILENAME_LEN];
 150         ubyte *buf = NULL;
 151
 152         SDL_strlcpy( tmp, filename, SDL_arraysize(tmp) );
 153         SDL_strlcat( tmp, NOX(".tga"), SDL_arraysize(tmp) );
 154
 155         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 156
 157         if (buf == NULL) {
 158                 return;
 159         }
 160
 161         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 162
 163         if (f == NULL) {
 164                 free(buf);
 165                 return;
 166         }
 167
 168         // Write the TGA header
 169         cfwrite_ubyte( 0, f );  //      IDLength;
 170         cfwrite_ubyte( 0, f );  //      ColorMapType;
 171         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 172         cfwrite_ushort( 0, f ); // CMapStart;
 173         cfwrite_ushort( 0, f ); //      CMapLength;
 174         cfwrite_ubyte( 0, f );  // CMapDepth;
 175         cfwrite_ushort( 0, f ); //      XOffset;
 176         cfwrite_ushort( 0, f ); //      YOffset;
 177         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 178         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 179         cfwrite_ubyte( 24, f ); //PixelDepth;
 180         cfwrite_ubyte( 0, f );  //ImageDesc;
 181
 182         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 183
 184         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_RGB, GL_UNSIGNED_BYTE, buf);
 185
 186         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 187
 188         cfclose(f);
 189
 190         free(buf);
 191 }
 192
 193 uint gr_opengl_lock()
 194 {
 195         return 1;
 196 }
 197
 198 void gr_opengl_unlock()
 199 {
 200 }
 201
 202 void gr_opengl_zbias(int bias)
 203 {
 204         if (bias) {
 205                 glEnable(GL_POLYGON_OFFSET_FILL);
 206                 glPolygonOffset(0.0f, GLfloat(-bias));
 207         } else {
 208                 glDisable(GL_POLYGON_OFFSET_FILL);
 209         }
 210 }
 211
 212 void gr_opengl_set_cull(int cull)
 213 {
 214         if (cull) {
 215                 glEnable (GL_CULL_FACE);
 216                 glFrontFace (GL_CCW);
 217         } else {
 218                 glDisable (GL_CULL_FACE);
 219         }
 220 }
 221
 222 void gr_opengl_activate(int active)
 223 {
 224         if (active) {
 225                 GL_activate++;
 226
 227                 // don't grab key/mouse if cmdline says so or if we're fullscreen
 228         //      if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
 229         //              SDL_WM_GrabInput(SDL_GRAB_ON);
 230         //      }
 231         } else {
 232                 GL_deactivate++;
 233
 234                 // let go of mouse/keyboard
 235         //      SDL_WM_GrabInput(SDL_GRAB_OFF);
 236         }
 237 }
 238
 239 void gr_opengl_cleanup()
 240 {
 241         opengl1_cleanup();
 242         opengl2_cleanup();
 243
 244         opengl_free_render_buffer();
 245
 246         os_set_window(NULL);
 247
 248         SDL_GL_DeleteContext(GL_context);
 249         GL_context = NULL;
 250
 251         SDL_DestroyWindow(GL_window);
 252         GL_window = NULL;
 253
 254         OGL_inited = false;
 255 }
 256
 257 void gr_opengl_init()
 258 {
 259         if ( OGL_inited )       {
 260                 gr_opengl_cleanup();
 261         }
 262
 263         mprintf(( "Initializing OpenGL graphics device...\n" ));
 264
 265         OGL_inited = true;
 266
 267         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 268                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 269         }
 270
 271         GL_window = SDL_CreateWindow(os_get_title(), SDL_WINDOWPOS_CENTERED,
 272                                                 SDL_WINDOWPOS_CENTERED,
 273                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 274
 275         if ( !GL_window ) {
 276                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 277         }
 278
 279         os_set_window(GL_window);
 280
 281         int a = 1, r = 5, g = 5, b = 5, bpp = 16;
 282         int FSAA = os_config_read_uint("Video", "AntiAlias", 0);
 283
 284         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 285         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 286         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 287         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 288         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 289
 290         if (FSAA) {
 291                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 292                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 293         }
 294
 295         int rc = 1;
 296
 297         // try GL 2 first, then fall back to GL 1
 298         if ( !opengl2_init() ) {
 299                 rc = opengl1_init();
 300         }
 301
 302         if ( !rc ) {
 303                 Error(LOCATION, "Unable to initialize OpenGL renderer!\n");
 304         }
 305
 306         mprintf(("  Attributes requested : ARGB %d%d%d%d, BPP %d, AA %d\n",
 307                          a, r, g, b, bpp, FSAA));
 308
 309         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 310         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 311         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 312         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 313         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 314         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 315
 316         mprintf(("  Attributes received  : ARGB %d%d%d%d, BPP %d, AA %d\n",
 317                          a, r, g, b, bpp, FSAA));
 318         mprintf(("\n"));
 319
 320         SDL_DisableScreenSaver();
 321         SDL_ShowCursor(0);
 322
 323         // maybe go fullscreen - should be done *after* main GL init
 324         int fullscreen = os_config_read_uint("Video", "Fullscreen", 1);
 325         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 326                 SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 327                 // poll for window events
 328                 os_poll();
 329         }
 330
 331         switch (bpp) {
 332                 case 15:
 333                 case 16:
 334                         gr_screen.bits_per_pixel = 16;
 335                         gr_screen.bytes_per_pixel = 2;
 336
 337                         // screen values
 338                         Gr_red.bits = 5;
 339                         Gr_red.shift = 11;
 340                         Gr_red.scale = 8;
 341                         Gr_red.mask = 0x7C01;
 342
 343                         Gr_green.bits = 5;
 344                         Gr_green.shift = 6;
 345                         Gr_green.scale = 8;
 346                         Gr_green.mask = 0x3E1;
 347
 348                         Gr_blue.bits = 5;
 349                         Gr_blue.shift = 1;
 350                         Gr_blue.scale = 8;
 351                         Gr_blue.mask = 0x20;
 352
 353                         Gr_alpha.bits = 1;
 354                         Gr_alpha.shift = 0;
 355                         Gr_alpha.scale = 255;
 356                         Gr_alpha.mask = 0x1;
 357
 358                         break;
 359
 360                 case 24:
 361                 case 32:
 362                         gr_screen.bits_per_pixel = 32;
 363                         gr_screen.bytes_per_pixel = 4;
 364
 365                         // screen values
 366                         Gr_red.bits = 8;
 367                         Gr_red.shift = 16;
 368                         Gr_red.scale = 1;
 369                         Gr_red.mask = 0xff0000;
 370
 371                         Gr_green.bits = 8;
 372                         Gr_green.shift = 8;
 373                         Gr_green.scale = 1;
 374                         Gr_green.mask = 0xff00;
 375
 376                         Gr_blue.bits = 8;
 377                         Gr_blue.shift = 0;
 378                         Gr_blue.scale = 1;
 379                         Gr_blue.mask = 0xff;
 380
 381                         Gr_alpha.bits = 8;
 382                         Gr_alpha.shift = 24;
 383                         Gr_alpha.scale = 1;
 384                         Gr_alpha.mask = 0xff000000;
 385
 386                         break;
 387
 388                 default:
 389                         Int3(); // Illegal bpp
 390                         break;
 391         }
 392
 393         // DDOI - set these so no one else does!
 394         // texture values, always 5551 - 16-bit
 395         Gr_t_red.mask = 0x7C01;
 396         Gr_t_red.shift = 11;
 397         Gr_t_red.scale = 8;
 398
 399         Gr_t_green.mask = 0x3E1;
 400         Gr_t_green.shift = 6;
 401         Gr_t_green.scale = 8;
 402
 403         Gr_t_blue.mask = 0x20;
 404         Gr_t_blue.shift = 1;
 405         Gr_t_blue.scale = 8;
 406
 407         Gr_t_alpha.mask = 0x1;
 408         Gr_t_alpha.shift = 0;
 409         Gr_t_alpha.scale = 255;
 410
 411         // alpha-texture values
 412         Gr_ta_red.mask = 0x0f00;
 413         Gr_ta_red.shift = 8;
 414         Gr_ta_red.scale = 16;
 415
 416         Gr_ta_green.mask = 0x00f0;
 417         Gr_ta_green.shift = 4;
 418         Gr_ta_green.scale = 16;
 419
 420         Gr_ta_blue.mask = 0x000f;
 421         Gr_ta_blue.shift = 0;
 422         Gr_ta_blue.scale = 16;
 423
 424         Gr_ta_alpha.mask = 0xf000;
 425         Gr_ta_alpha.shift = 12;
 426         Gr_ta_alpha.scale = 16;
 427
 428         // default to screen
 429         Gr_current_red = &Gr_red;
 430         Gr_current_blue = &Gr_blue;
 431         Gr_current_green = &Gr_green;
 432         Gr_current_alpha = &Gr_alpha;
 433
 434
 435         Mouse_hidden++;
 436         gr_reset_clip();
 437         gr_clear();
 438         gr_flip();
 439         gr_clear();
 440         Mouse_hidden--;
 441 }