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_force_windowed()
 123 {
 124         SDL_SetWindowFullscreen(GL_window, 0);
 125 }
 126
 127 void gr_opengl_force_fullscreen()
 128 {
 129         SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 130 }
 131
 132 void gr_opengl_toggle_fullscreen()
 133 {
 134         Uint32 flags = SDL_GetWindowFlags(GL_window);
 135
 136         if ( (flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP ) {
 137                 gr_opengl_force_windowed();
 138         } else {
 139                 gr_opengl_force_fullscreen();
 140         }
 141 }
 142
 143 void gr_opengl_clear()
 144 {
 145         glClearColor(gr_screen.current_clear_color.red / 255.0f,
 146                 gr_screen.current_clear_color.green / 255.0f,
 147                 gr_screen.current_clear_color.blue / 255.0f, 1.0f);
 148
 149         glClear( GL_COLOR_BUFFER_BIT );
 150 }
 151
 152 void gr_opengl_reset_clip()
 153 {
 154         gr_screen.offset_x = 0;
 155         gr_screen.offset_y = 0;
 156         gr_screen.clip_left = 0;
 157         gr_screen.clip_top = 0;
 158         gr_screen.clip_right = gr_screen.max_w - 1;
 159         gr_screen.clip_bottom = gr_screen.max_h - 1;
 160         gr_screen.clip_width = gr_screen.max_w;
 161         gr_screen.clip_height = gr_screen.max_h;
 162
 163         glDisable(GL_SCISSOR_TEST);
 164 }
 165
 166 void gr_opengl_print_screen(const char *filename)
 167 {
 168         char tmp[MAX_FILENAME_LEN];
 169         ubyte *buf = NULL;
 170
 171         SDL_strlcpy( tmp, filename, SDL_arraysize(tmp) );
 172         SDL_strlcat( tmp, NOX(".tga"), SDL_arraysize(tmp) );
 173
 174         buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
 175
 176         if (buf == NULL) {
 177                 return;
 178         }
 179
 180         CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
 181
 182         if (f == NULL) {
 183                 free(buf);
 184                 return;
 185         }
 186
 187         // Write the TGA header
 188         cfwrite_ubyte( 0, f );  //      IDLength;
 189         cfwrite_ubyte( 0, f );  //      ColorMapType;
 190         cfwrite_ubyte( 2, f );  //      ImageType;              // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
 191         cfwrite_ushort( 0, f ); // CMapStart;
 192         cfwrite_ushort( 0, f ); //      CMapLength;
 193         cfwrite_ubyte( 0, f );  // CMapDepth;
 194         cfwrite_ushort( 0, f ); //      XOffset;
 195         cfwrite_ushort( 0, f ); //      YOffset;
 196         cfwrite_ushort( (ushort)GL_viewport_w, f );     //      Width;
 197         cfwrite_ushort( (ushort)GL_viewport_h, f );     //      Height;
 198         cfwrite_ubyte( 24, f ); //PixelDepth;
 199         cfwrite_ubyte( 0, f );  //ImageDesc;
 200
 201         memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
 202
 203         glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_RGB, GL_UNSIGNED_BYTE, buf);
 204
 205         cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
 206
 207         cfclose(f);
 208
 209         free(buf);
 210 }
 211
 212 uint gr_opengl_lock()
 213 {
 214         return 1;
 215 }
 216
 217 void gr_opengl_unlock()
 218 {
 219 }
 220
 221 void gr_opengl_zbias(int bias)
 222 {
 223         if (bias) {
 224                 glEnable(GL_POLYGON_OFFSET_FILL);
 225                 glPolygonOffset(0.0f, GLfloat(-bias));
 226         } else {
 227                 glDisable(GL_POLYGON_OFFSET_FILL);
 228         }
 229 }
 230
 231 void gr_opengl_set_cull(int cull)
 232 {
 233         if (cull) {
 234                 glEnable (GL_CULL_FACE);
 235                 glFrontFace (GL_CCW);
 236         } else {
 237                 glDisable (GL_CULL_FACE);
 238         }
 239 }
 240
 241 void gr_opengl_activate(int active)
 242 {
 243         if (active) {
 244                 GL_activate++;
 245
 246                 // don't grab key/mouse if cmdline says so or if we're fullscreen
 247         //      if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
 248         //              SDL_WM_GrabInput(SDL_GRAB_ON);
 249         //      }
 250         } else {
 251                 GL_deactivate++;
 252
 253                 // let go of mouse/keyboard
 254         //      SDL_WM_GrabInput(SDL_GRAB_OFF);
 255         }
 256 }
 257
 258 void gr_opengl_cleanup()
 259 {
 260         opengl1_cleanup();
 261         opengl2_cleanup();
 262
 263         opengl_free_render_buffer();
 264
 265         os_set_window(NULL);
 266
 267         SDL_DestroyWindow(GL_window);
 268         GL_window = NULL;
 269
 270         OGL_inited = false;
 271 }
 272
 273 void gr_opengl_init()
 274 {
 275         if ( OGL_inited )       {
 276                 gr_opengl_cleanup();
 277         }
 278
 279         mprintf(( "Initializing OpenGL graphics device...\n" ));
 280
 281         OGL_inited = true;
 282
 283         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 284                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 285         }
 286
 287         GL_window = SDL_CreateWindow(os_get_title(), SDL_WINDOWPOS_CENTERED,
 288                                                 SDL_WINDOWPOS_CENTERED,
 289                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 290
 291         if ( !GL_window ) {
 292                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 293         }
 294
 295         os_set_window(GL_window);
 296
 297         int a = 1, r = 5, g = 5, b = 5, bpp = 16;
 298         int FSAA = os_config_read_uint("Video", "AntiAlias", 0);
 299
 300         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 301         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 302         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 303         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 304         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 305
 306         if (FSAA) {
 307                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 308                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 309         }
 310
 311         int rc = 1;
 312
 313         // try GL 2 first, then fall back to GL 1
 314         if ( !opengl2_init() ) {
 315                 rc = opengl1_init();
 316         }
 317
 318         if ( !rc ) {
 319                 Error(LOCATION, "Unable to initialize OpenGL renderer!\n");
 320         }
 321
 322         mprintf(("  Attributes requested : ARGB %d%d%d%d, BPP %d, AA %d\n",
 323                          a, r, g, b, bpp, FSAA));
 324
 325         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 326         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 327         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 328         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 329         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 330         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 331
 332         mprintf(("  Attributes received  : ARGB %d%d%d%d, BPP %d, AA %d\n",
 333                          a, r, g, b, bpp, FSAA));
 334         mprintf(("\n"));
 335
 336         SDL_DisableScreenSaver();
 337         SDL_ShowCursor(0);
 338
 339         // maybe go fullscreen - should be done *after* main GL init
 340         int fullscreen = os_config_read_uint("Video", "Fullscreen", 1);
 341         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 342                 SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 343                 // poll for window events
 344                 os_poll();
 345         }
 346
 347         switch (bpp) {
 348                 case 15:
 349                 case 16:
 350                         gr_screen.bits_per_pixel = 16;
 351                         gr_screen.bytes_per_pixel = 2;
 352
 353                         // screen values
 354                         Gr_red.bits = 5;
 355                         Gr_red.shift = 11;
 356                         Gr_red.scale = 8;
 357                         Gr_red.mask = 0x7C01;
 358
 359                         Gr_green.bits = 5;
 360                         Gr_green.shift = 6;
 361                         Gr_green.scale = 8;
 362                         Gr_green.mask = 0x3E1;
 363
 364                         Gr_blue.bits = 5;
 365                         Gr_blue.shift = 1;
 366                         Gr_blue.scale = 8;
 367                         Gr_blue.mask = 0x20;
 368
 369                         Gr_alpha.bits = 1;
 370                         Gr_alpha.shift = 0;
 371                         Gr_alpha.scale = 255;
 372                         Gr_alpha.mask = 0x1;
 373
 374                         break;
 375
 376                 case 24:
 377                 case 32:
 378                         gr_screen.bits_per_pixel = 32;
 379                         gr_screen.bytes_per_pixel = 4;
 380
 381                         // screen values
 382                         Gr_red.bits = 8;
 383                         Gr_red.shift = 0;
 384                         Gr_red.scale = 1;
 385                         Gr_red.mask = 0xff;
 386
 387                         Gr_green.bits = 8;
 388                         Gr_green.shift = 8;
 389                         Gr_green.scale = 1;
 390                         Gr_green.mask = 0xff00;
 391
 392                         Gr_blue.bits = 8;
 393                         Gr_blue.shift = 16;
 394                         Gr_blue.scale = 1;
 395                         Gr_blue.mask = 0xff0000;
 396
 397                         Gr_alpha.bits = 8;
 398                         Gr_alpha.shift = 24;
 399                         Gr_alpha.scale = 1;
 400                         Gr_alpha.mask = 0xff000000;
 401
 402                         break;
 403
 404                 default:
 405                         Int3(); // Illegal bpp
 406                         break;
 407         }
 408
 409         // DDOI - set these so no one else does!
 410         // texture values, always 5551 - 16-bit
 411         Gr_t_red.mask = 0x7C01;
 412         Gr_t_red.shift = 11;
 413         Gr_t_red.scale = 8;
 414
 415         Gr_t_green.mask = 0x3E1;
 416         Gr_t_green.shift = 6;
 417         Gr_t_green.scale = 8;
 418
 419         Gr_t_blue.mask = 0x20;
 420         Gr_t_blue.shift = 1;
 421         Gr_t_blue.scale = 8;
 422
 423         Gr_t_alpha.mask = 0x1;
 424         Gr_t_alpha.shift = 0;
 425         Gr_t_alpha.scale = 255;
 426
 427         // alpha-texture values
 428         Gr_ta_red.mask = 0x0f00;
 429         Gr_ta_red.shift = 8;
 430         Gr_ta_red.scale = 16;
 431
 432         Gr_ta_green.mask = 0x00f0;
 433         Gr_ta_green.shift = 4;
 434         Gr_ta_green.scale = 16;
 435
 436         Gr_ta_blue.mask = 0x000f;
 437         Gr_ta_blue.shift = 0;
 438         Gr_ta_blue.scale = 16;
 439
 440         Gr_ta_alpha.mask = 0xf000;
 441         Gr_ta_alpha.shift = 12;
 442         Gr_ta_alpha.scale = 16;
 443
 444         // default to screen
 445         Gr_current_red = &Gr_red;
 446         Gr_current_blue = &Gr_blue;
 447         Gr_current_green = &Gr_green;
 448         Gr_current_alpha = &Gr_alpha;
 449
 450
 451         Mouse_hidden++;
 452         gr_reset_clip();
 453         gr_clear();
 454         gr_flip();
 455         gr_clear();
 456         Mouse_hidden--;
 457 }