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 opengl_stuff_fog_value(float z, float *f_val)
 104 {
 105         float f_float;
 106
 107         if ( !f_val ) {
 108                 return;
 109         }
 110
 111         f_float = 1.0f - ((gr_screen.fog_far - z) / (gr_screen.fog_far - gr_screen.fog_near));
 112
 113         if (f_float < 0.0f) {
 114                 f_float = 0.0f;
 115         } else if (f_float > 1.0f) {
 116                 f_float = 1.0f;
 117         }
 118
 119         *f_val = f_float;
 120 }
 121
 122 void gr_opengl_clear()
 123 {
 124         glClearColor(gr_screen.current_clear_color.red / 255.0f,
 125                 gr_screen.current_clear_color.green / 255.0f,
 126                 gr_screen.current_clear_color.blue / 255.0f, 1.0f);
 127
 128         glClear( GL_COLOR_BUFFER_BIT );
 129 }
 130
 131 void gr_opengl_reset_clip()
 132 {
 133         gr_screen.offset_x = 0;
 134         gr_screen.offset_y = 0;
 135         gr_screen.clip_left = 0;
 136         gr_screen.clip_top = 0;
 137         gr_screen.clip_right = gr_screen.max_w - 1;
 138         gr_screen.clip_bottom = gr_screen.max_h - 1;
 139         gr_screen.clip_width = gr_screen.max_w;
 140         gr_screen.clip_height = gr_screen.max_h;
 141
 142         glDisable(GL_SCISSOR_TEST);
 143 }
 144
 145 void gr_opengl_print_screen(const char *filename)
 146 {
 147         char tmp[MAX_FILENAME_LEN];
 148         ubyte *buf = NULL;
 149
 150         SDL_strlcpy( tmp, filename, SDL_arraysize(tmp) );
 151         SDL_strlcat( tmp, NOX(".tga"), SDL_arraysize(tmp) );
 152
 153         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 154
 155         if (buf == NULL) {
 156                 return;
 157         }
 158
 159         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 160
 161         if (f == NULL) {
 162                 free(buf);
 163                 return;
 164         }
 165
 166         // Write the TGA header
 167         cfwrite_ubyte( 0, f );  //      IDLength;
 168         cfwrite_ubyte( 0, f );  //      ColorMapType;
 169         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 170         cfwrite_ushort( 0, f ); // CMapStart;
 171         cfwrite_ushort( 0, f ); //      CMapLength;
 172         cfwrite_ubyte( 0, f );  // CMapDepth;
 173         cfwrite_ushort( 0, f ); //      XOffset;
 174         cfwrite_ushort( 0, f ); //      YOffset;
 175         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 176         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 177         cfwrite_ubyte( 24, f ); //PixelDepth;
 178         cfwrite_ubyte( 0, f );  //ImageDesc;
 179
 180         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 181
 182         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_RGB, GL_UNSIGNED_BYTE, buf);
 183
 184         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 185
 186         cfclose(f);
 187
 188         free(buf);
 189 }
 190
 191 uint gr_opengl_lock()
 192 {
 193         return 1;
 194 }
 195
 196 void gr_opengl_unlock()
 197 {
 198 }
 199
 200 void gr_opengl_zbias(int bias)
 201 {
 202         if (bias) {
 203                 glEnable(GL_POLYGON_OFFSET_FILL);
 204                 glPolygonOffset(0.0f, GLfloat(-bias));
 205         } else {
 206                 glDisable(GL_POLYGON_OFFSET_FILL);
 207         }
 208 }
 209
 210 void gr_opengl_set_cull(int cull)
 211 {
 212         if (cull) {
 213                 glEnable (GL_CULL_FACE);
 214                 glFrontFace (GL_CCW);
 215         } else {
 216                 glDisable (GL_CULL_FACE);
 217         }
 218 }
 219
 220 void gr_opengl_activate(int active)
 221 {
 222         if (active) {
 223                 GL_activate++;
 224
 225                 // don't grab key/mouse if cmdline says so or if we're fullscreen
 226         //      if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
 227         //              SDL_WM_GrabInput(SDL_GRAB_ON);
 228         //      }
 229         } else {
 230                 GL_deactivate++;
 231
 232                 // let go of mouse/keyboard
 233         //      SDL_WM_GrabInput(SDL_GRAB_OFF);
 234         }
 235 }
 236
 237 void gr_opengl_cleanup()
 238 {
 239         opengl1_cleanup();
 240         opengl2_cleanup();
 241
 242         opengl_free_render_buffer();
 243
 244         os_set_window(NULL);
 245
 246         SDL_DestroyWindow(GL_window);
 247         GL_window = NULL;
 248
 249         OGL_inited = false;
 250 }
 251
 252 void gr_opengl_init()
 253 {
 254         if ( OGL_inited )       {
 255                 gr_opengl_cleanup();
 256         }
 257
 258         mprintf(( "Initializing OpenGL graphics device...\n" ));
 259
 260         OGL_inited = true;
 261
 262         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 263                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 264         }
 265
 266         GL_window = SDL_CreateWindow(os_get_title(), SDL_WINDOWPOS_CENTERED,
 267                                                 SDL_WINDOWPOS_CENTERED,
 268                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 269
 270         if ( !GL_window ) {
 271                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 272         }
 273
 274         os_set_window(GL_window);
 275
 276         int a = 1, r = 5, g = 5, b = 5, bpp = 16;
 277         int FSAA = os_config_read_uint("Video", "AntiAlias", 0);
 278
 279         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 280         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 281         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 282         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 283         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 284
 285         if (FSAA) {
 286                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 287                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 288         }
 289
 290         int rc = 1;
 291
 292         // try GL 2 first, then fall back to GL 1
 293         if ( !opengl2_init() ) {
 294                 rc = opengl1_init();
 295         }
 296
 297         if ( !rc ) {
 298                 Error(LOCATION, "Unable to initialize OpenGL renderer!\n");
 299         }
 300
 301         mprintf(("  Attributes requested : ARGB %d%d%d%d, BPP %d, AA %d\n",
 302                          a, r, g, b, bpp, FSAA));
 303
 304         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 305         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 306         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 307         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 308         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 309         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 310
 311         mprintf(("  Attributes received  : ARGB %d%d%d%d, BPP %d, AA %d\n",
 312                          a, r, g, b, bpp, FSAA));
 313         mprintf(("\n"));
 314
 315         SDL_DisableScreenSaver();
 316         SDL_ShowCursor(0);
 317
 318         // maybe go fullscreen - should be done *after* main GL init
 319         int fullscreen = os_config_read_uint("Video", "Fullscreen", 1);
 320         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 321                 gr_force_fullscreen();
 322                 // poll for window events
 323                 os_poll();
 324         }
 325
 326         switch (bpp) {
 327                 case 15:
 328                 case 16:
 329                         gr_screen.bits_per_pixel = 16;
 330                         gr_screen.bytes_per_pixel = 2;
 331
 332                         // screen values
 333                         Gr_red.bits = 5;
 334                         Gr_red.shift = 11;
 335                         Gr_red.scale = 8;
 336                         Gr_red.mask = 0x7C01;
 337
 338                         Gr_green.bits = 5;
 339                         Gr_green.shift = 6;
 340                         Gr_green.scale = 8;
 341                         Gr_green.mask = 0x3E1;
 342
 343                         Gr_blue.bits = 5;
 344                         Gr_blue.shift = 1;
 345                         Gr_blue.scale = 8;
 346                         Gr_blue.mask = 0x20;
 347
 348                         Gr_alpha.bits = 1;
 349                         Gr_alpha.shift = 0;
 350                         Gr_alpha.scale = 255;
 351                         Gr_alpha.mask = 0x1;
 352
 353                         break;
 354
 355                 case 24:
 356                 case 32:
 357                         gr_screen.bits_per_pixel = 32;
 358                         gr_screen.bytes_per_pixel = 4;
 359
 360                         // screen values
 361                         Gr_red.bits = 8;
 362                         Gr_red.shift = 0;
 363                         Gr_red.scale = 1;
 364                         Gr_red.mask = 0xff;
 365
 366                         Gr_green.bits = 8;
 367                         Gr_green.shift = 8;
 368                         Gr_green.scale = 1;
 369                         Gr_green.mask = 0xff00;
 370
 371                         Gr_blue.bits = 8;
 372                         Gr_blue.shift = 16;
 373                         Gr_blue.scale = 1;
 374                         Gr_blue.mask = 0xff0000;
 375
 376                         Gr_alpha.bits = 8;
 377                         Gr_alpha.shift = 24;
 378                         Gr_alpha.scale = 1;
 379                         Gr_alpha.mask = 0xff000000;
 380
 381                         break;
 382
 383                 default:
 384                         Int3(); // Illegal bpp
 385                         break;
 386         }
 387
 388         // DDOI - set these so no one else does!
 389         // texture values, always 5551 - 16-bit
 390         Gr_t_red.mask = 0x7C01;
 391         Gr_t_red.shift = 11;
 392         Gr_t_red.scale = 8;
 393
 394         Gr_t_green.mask = 0x3E1;
 395         Gr_t_green.shift = 6;
 396         Gr_t_green.scale = 8;
 397
 398         Gr_t_blue.mask = 0x20;
 399         Gr_t_blue.shift = 1;
 400         Gr_t_blue.scale = 8;
 401
 402         Gr_t_alpha.mask = 0x1;
 403         Gr_t_alpha.shift = 0;
 404         Gr_t_alpha.scale = 255;
 405
 406         // alpha-texture values
 407         Gr_ta_red.mask = 0x0f00;
 408         Gr_ta_red.shift = 8;
 409         Gr_ta_red.scale = 16;
 410
 411         Gr_ta_green.mask = 0x00f0;
 412         Gr_ta_green.shift = 4;
 413         Gr_ta_green.scale = 16;
 414
 415         Gr_ta_blue.mask = 0x000f;
 416         Gr_ta_blue.shift = 0;
 417         Gr_ta_blue.scale = 16;
 418
 419         Gr_ta_alpha.mask = 0xf000;
 420         Gr_ta_alpha.shift = 12;
 421         Gr_ta_alpha.scale = 16;
 422
 423         // default to screen
 424         Gr_current_red = &Gr_red;
 425         Gr_current_blue = &Gr_blue;
 426         Gr_current_green = &Gr_green;
 427         Gr_current_alpha = &Gr_alpha;
 428
 429
 430         Mouse_hidden++;
 431         gr_reset_clip();
 432         gr_clear();
 433         gr_flip();
 434         gr_clear();
 435         Mouse_hidden--;
 436 }