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         } else {
 225                 GL_deactivate++;
 226         }
 227 }
 228
 229 void gr_opengl_cleanup()
 230 {
 231         opengl1_cleanup();
 232         opengl2_cleanup();
 233
 234         opengl_free_render_buffer();
 235
 236         os_set_window(NULL);
 237
 238         SDL_DestroyWindow(GL_window);
 239         GL_window = NULL;
 240
 241         OGL_inited = false;
 242 }
 243
 244 void gr_opengl_init()
 245 {
 246         if ( OGL_inited )       {
 247                 gr_opengl_cleanup();
 248         }
 249
 250         mprintf(( "Initializing OpenGL graphics device...\n" ));
 251
 252         OGL_inited = true;
 253
 254         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 255                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 256         }
 257
 258         GL_window = SDL_CreateWindow(os_get_title(), SDL_WINDOWPOS_CENTERED,
 259                                                 SDL_WINDOWPOS_CENTERED,
 260                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 261
 262         if ( !GL_window ) {
 263                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 264         }
 265
 266         os_set_window(GL_window);
 267
 268         int a = 1, r = 5, g = 5, b = 5, bpp = 16;
 269         int FSAA = os_config_read_uint("Video", "AntiAlias", 0);
 270
 271         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 272         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 273         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 274         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 275         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 276
 277         if (FSAA) {
 278                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 279                 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 280         }
 281
 282         int rc = 1;
 283
 284         // try GL 2 first, then fall back to GL 1
 285         if ( !opengl2_init() ) {
 286                 rc = opengl1_init();
 287         }
 288
 289         if ( !rc ) {
 290                 Error(LOCATION, "Unable to initialize OpenGL renderer!\n");
 291         }
 292
 293         mprintf(("  Attributes requested : ARGB %d%d%d%d, BPP %d, AA %d\n",
 294                          a, r, g, b, bpp, FSAA));
 295
 296         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 297         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 298         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 299         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 300         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 301         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 302
 303         mprintf(("  Attributes received  : ARGB %d%d%d%d, BPP %d, AA %d\n",
 304                          a, r, g, b, bpp, FSAA));
 305         mprintf(("\n"));
 306
 307         SDL_DisableScreenSaver();
 308         SDL_ShowCursor(0);
 309
 310         // maybe go fullscreen - should be done *after* main GL init
 311         int fullscreen = os_config_read_uint("Video", "Fullscreen", 1);
 312         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 313                 gr_force_fullscreen();
 314                 // poll for window events
 315                 os_poll();
 316         }
 317
 318         switch (bpp) {
 319                 case 15:
 320                 case 16:
 321                         gr_screen.bits_per_pixel = 16;
 322                         gr_screen.bytes_per_pixel = 2;
 323
 324                         // screen values
 325                         Gr_red.bits = 5;
 326                         Gr_red.shift = 11;
 327                         Gr_red.scale = 8;
 328                         Gr_red.mask = 0x7C01;
 329
 330                         Gr_green.bits = 5;
 331                         Gr_green.shift = 6;
 332                         Gr_green.scale = 8;
 333                         Gr_green.mask = 0x3E1;
 334
 335                         Gr_blue.bits = 5;
 336                         Gr_blue.shift = 1;
 337                         Gr_blue.scale = 8;
 338                         Gr_blue.mask = 0x20;
 339
 340                         Gr_alpha.bits = 1;
 341                         Gr_alpha.shift = 0;
 342                         Gr_alpha.scale = 255;
 343                         Gr_alpha.mask = 0x1;
 344
 345                         break;
 346
 347                 case 24:
 348                 case 32:
 349                         gr_screen.bits_per_pixel = 32;
 350                         gr_screen.bytes_per_pixel = 4;
 351
 352                         // screen values
 353                         Gr_red.bits = 8;
 354                         Gr_red.shift = 0;
 355                         Gr_red.scale = 1;
 356                         Gr_red.mask = 0xff;
 357
 358                         Gr_green.bits = 8;
 359                         Gr_green.shift = 8;
 360                         Gr_green.scale = 1;
 361                         Gr_green.mask = 0xff00;
 362
 363                         Gr_blue.bits = 8;
 364                         Gr_blue.shift = 16;
 365                         Gr_blue.scale = 1;
 366                         Gr_blue.mask = 0xff0000;
 367
 368                         Gr_alpha.bits = 8;
 369                         Gr_alpha.shift = 24;
 370                         Gr_alpha.scale = 1;
 371                         Gr_alpha.mask = 0xff000000;
 372
 373                         break;
 374
 375                 default:
 376                         Int3(); // Illegal bpp
 377                         break;
 378         }
 379
 380         // DDOI - set these so no one else does!
 381         // texture values, always 5551 - 16-bit
 382         Gr_t_red.mask = 0x7C01;
 383         Gr_t_red.shift = 11;
 384         Gr_t_red.scale = 8;
 385
 386         Gr_t_green.mask = 0x3E1;
 387         Gr_t_green.shift = 6;
 388         Gr_t_green.scale = 8;
 389
 390         Gr_t_blue.mask = 0x20;
 391         Gr_t_blue.shift = 1;
 392         Gr_t_blue.scale = 8;
 393
 394         Gr_t_alpha.mask = 0x1;
 395         Gr_t_alpha.shift = 0;
 396         Gr_t_alpha.scale = 255;
 397
 398         // alpha-texture values
 399         Gr_ta_red.mask = 0x0f00;
 400         Gr_ta_red.shift = 8;
 401         Gr_ta_red.scale = 16;
 402
 403         Gr_ta_green.mask = 0x00f0;
 404         Gr_ta_green.shift = 4;
 405         Gr_ta_green.scale = 16;
 406
 407         Gr_ta_blue.mask = 0x000f;
 408         Gr_ta_blue.shift = 0;
 409         Gr_ta_blue.scale = 16;
 410
 411         Gr_ta_alpha.mask = 0xf000;
 412         Gr_ta_alpha.shift = 12;
 413         Gr_ta_alpha.scale = 16;
 414
 415         // default to screen
 416         Gr_current_red = &Gr_red;
 417         Gr_current_blue = &Gr_blue;
 418         Gr_current_green = &Gr_green;
 419         Gr_current_alpha = &Gr_alpha;
 420
 421
 422         Mouse_hidden++;
 423         gr_reset_clip();
 424         gr_clear();
 425         gr_flip();
 426         gr_clear();
 427         Mouse_hidden--;
 428 }