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 "pstypes.h"
  10 #include "osregistry.h"
  11 #include "gropengl.h"
  12 #include "gropengl1.h"
  13 #include "gropenglinternal.h"
  14 #include "2d.h"
  15 #include "bmpman.h"
  16 #include "grinternal.h"
  17 #include "cmdline.h"
  18 #include "mouse.h"
  19
  20
  21 bool OGL_inited = false;
  22 int GL_version = 0;
  23
  24 SDL_Window *GL_window = NULL;
  25 SDL_GLContext GL_context;
  26
  27 static int FSAA = 0;
  28
  29 int GL_viewport_x = 0;
  30 int GL_viewport_y = 0;
  31 int GL_viewport_w = 640;
  32 int GL_viewport_h = 480;
  33 float GL_viewport_scale_w = 1.0f;
  34 float GL_viewport_scale_h = 1.0f;
  35 int GL_min_texture_width = 0;
  36 int GL_max_texture_width = 0;
  37 int GL_min_texture_height = 0;
  38 int GL_max_texture_height = 0;
  39
  40 rb_t *render_buffer = NULL;
  41 static size_t render_buffer_size = 0;
  42
  43
  44 void opengl_alloc_render_buffer(unsigned int nelems)
  45 {
  46         if (nelems < 0) {
  47                 nelems = 1;
  48         }
  49
  50         if ( render_buffer && (nelems <= render_buffer_size) ) {
  51                 return;
  52         }
  53
  54         if (render_buffer) {
  55                 free(render_buffer);
  56         }
  57
  58         render_buffer = (rb_t*) malloc(sizeof(rb_t) * nelems);
  59         render_buffer_size = nelems;
  60 }
  61
  62 void opengl_free_render_buffer()
  63 {
  64         if (render_buffer) {
  65                 free(render_buffer);
  66                 render_buffer = NULL;
  67                 render_buffer_size = 0;
  68         }
  69 }
  70
  71 static void opengl_set_variables()
  72 {
  73         GL_min_texture_height = 16;
  74         GL_min_texture_width = 16;
  75
  76         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
  77         GL_max_texture_height = GL_max_texture_width;
  78
  79         // no texture is larger than 1024, so maybe don't use sections
  80         if (GL_max_texture_width >= 1024) {
  81                 gr_screen.use_sections = 0;
  82         }
  83 }
  84
  85 void gr_opengl_set_viewport(int width, int height)
  86 {
  87         int w, h, x, y;
  88
  89         float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
  90
  91         w = width;
  92         h = i2fl((width / ratio) + 0.5f);
  93
  94         if (h > height) {
  95                 h = height;
  96                 w = i2fl((height * ratio) + 0.5f);
  97         }
  98
  99         x = (width - w) / 2;
 100         y = (height - h) / 2;
 101
 102         GL_viewport_x = x;
 103         GL_viewport_y = y;
 104         GL_viewport_w = w;
 105         GL_viewport_h = h;
 106         GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
 107         GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
 108
 109         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 110
 111         glMatrixMode(GL_PROJECTION);
 112         glLoadIdentity();
 113         glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
 114         glMatrixMode(GL_MODELVIEW);
 115         glLoadIdentity();
 116         glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
 117 }
 118
 119 void gr_opengl_force_windowed()
 120 {
 121         SDL_SetWindowFullscreen(GL_window, 0);
 122 }
 123
 124 void gr_opengl_force_fullscreen()
 125 {
 126         int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
 127         int flag = SDL_WINDOW_FULLSCREEN_DESKTOP;
 128
 129         if (fullscreen == 2) {
 130                 flag = SDL_WINDOW_FULLSCREEN;
 131         }
 132
 133         SDL_SetWindowFullscreen(GL_window, flag);
 134 }
 135
 136 void gr_opengl_set_color_fast(color *dst)
 137 {
 138         if ( dst->screen_sig != gr_screen.signature )   {
 139                 if ( dst->is_alphacolor )       {
 140                         gr_opengl_init_alphacolor( dst, dst->red, dst->green, dst->blue, dst->alpha, dst->ac_type );
 141                 } else {
 142                         gr_opengl_init_color( dst, dst->red, dst->green, dst->blue );
 143                 }
 144         }
 145         gr_screen.current_color = *dst;
 146 }
 147
 148 void gr_opengl_get_color( int * r, int * g, int * b )
 149 {
 150         if (r) *r = gr_screen.current_color.red;
 151         if (g) *g = gr_screen.current_color.green;
 152         if (b) *b = gr_screen.current_color.blue;
 153 }
 154
 155 void gr_opengl_init_color(color *c, int r, int g, int b)
 156 {
 157         c->screen_sig = gr_screen.signature;
 158         c->red = (unsigned char)r;
 159         c->green = (unsigned char)g;
 160         c->blue = (unsigned char)b;
 161         c->alpha = 255;
 162         c->ac_type = AC_TYPE_NONE;
 163         c->alphacolor = -1;
 164         c->is_alphacolor = 0;
 165         c->magic = 0xAC01;
 166 }
 167
 168 void gr_opengl_init_alphacolor( color *clr, int r, int g, int b, int alpha, int type )
 169 {
 170         if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
 171         if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
 172         if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
 173         if ( alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
 174
 175         gr_opengl_init_color( clr, r, g, b );
 176
 177         clr->alpha = (unsigned char)alpha;
 178         clr->ac_type = (ubyte)type;
 179         clr->alphacolor = -1;
 180         clr->is_alphacolor = 1;
 181 }
 182
 183 void gr_opengl_set_color( int r, int g, int b )
 184 {
 185         SDL_assert((r >= 0) && (r < 256));
 186         SDL_assert((g >= 0) && (g < 256));
 187         SDL_assert((b >= 0) && (b < 256));
 188
 189         gr_opengl_init_color( &gr_screen.current_color, r, g, b );
 190 }
 191
 192 void gr_opengl_set_clear_color(int r, int g, int b)
 193 {
 194         gr_opengl_init_color(&gr_screen.current_clear_color, r, g, b);
 195 }
 196
 197 void gr_opengl_set_bitmap(int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy)
 198 {
 199         gr_screen.current_alpha = alpha;
 200         gr_screen.current_alphablend_mode = alphablend_mode;
 201         gr_screen.current_bitblt_mode = bitblt_mode;
 202         gr_screen.current_bitmap = bitmap_num;
 203
 204         gr_screen.current_bitmap_sx = sx;
 205         gr_screen.current_bitmap_sy = sy;
 206 }
 207
 208 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
 209 {
 210         shade->screen_sig = gr_screen.signature;
 211         shade->r = r;
 212         shade->g = g;
 213         shade->b = b;
 214         shade->c = c;
 215 }
 216
 217 void gr_opengl_set_shader( shader * shade )
 218 {
 219         if ( shade )    {
 220                 if (shade->screen_sig != gr_screen.signature)   {
 221                         gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
 222                 }
 223                 gr_screen.current_shader = *shade;
 224         } else {
 225                 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
 226         }
 227 }
 228
 229 int gr_opengl_zbuffer_get()
 230 {
 231         if ( !Gr_global_zbuffering ) {
 232                 return GR_ZBUFF_NONE;
 233         }
 234
 235         return Gr_zbuffering_mode;
 236 }
 237
 238 int gr_opengl_zbuffer_set(int mode)
 239 {
 240         int tmp = Gr_zbuffering_mode;
 241
 242         Gr_zbuffering_mode = mode;
 243
 244         if (Gr_zbuffering_mode == GR_ZBUFF_NONE) {
 245                 Gr_zbuffering = 0;
 246         } else {
 247                 Gr_zbuffering = 1;
 248         }
 249
 250         return tmp;
 251 }
 252
 253 void gr_opengl_cleanup()
 254 {
 255         opengl1_cleanup();
 256
 257         opengl_free_render_buffer();
 258 }
 259
 260 void gr_opengl_init()
 261 {
 262         if ( OGL_inited )       {
 263                 gr_opengl_cleanup();
 264                 OGL_inited = false;
 265         }
 266
 267         mprintf(( "Initializing OpenGL graphics device...\n" ));
 268
 269         OGL_inited = true;
 270
 271         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 272                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 273         }
 274
 275         int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
 276
 277         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 278         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 279         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 280         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 281         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 282         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
 283
 284         FSAA = os_config_read_uint(NULL, "FSAA", 2);
 285
 286         if (FSAA) {
 287             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 288             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 289         }
 290
 291         GL_window = SDL_CreateWindow(Osreg_title, SDL_WINDOWPOS_CENTERED,
 292                                                 SDL_WINDOWPOS_CENTERED,
 293                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 294
 295         if ( !GL_window ) {
 296                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 297         }
 298
 299         GL_context = SDL_GL_CreateContext(GL_window);
 300
 301         const char *gl_version = (const char*)glGetString(GL_VERSION);
 302         int v_major = 0, v_minor = 0;
 303
 304         sscanf(gl_version, "%d.%d", &v_major, &v_minor);
 305
 306         GL_version = (v_major * 10) + v_minor;
 307
 308         // version check, require 1.2+ for sake of simplicity
 309         if (GL_version < 12) {
 310                 Error(LOCATION, "Minimum OpenGL version is 1.2!");
 311         }
 312
 313         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 314         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 315         mprintf(("  Version  : %s\n", gl_version));
 316
 317         mprintf(("  Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 318
 319         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 320         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 321         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 322         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 323         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 324         SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
 325         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 326
 327         mprintf(("  Attributes received : ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 328
 329
 330         SDL_DisableScreenSaver();
 331         SDL_ShowCursor(0);
 332
 333         // initial setup viewport
 334         gr_opengl_set_viewport(gr_screen.max_w, gr_screen.max_h);
 335
 336         // maybe go fullscreen - should be done *after* initial viewport setup
 337         int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
 338         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 339                 int flag = SDL_WINDOW_FULLSCREEN_DESKTOP;
 340
 341                 if (fullscreen == 2) {
 342                         flag = SDL_WINDOW_FULLSCREEN;
 343                 }
 344
 345                 SDL_SetWindowFullscreen(GL_window, flag);
 346         }
 347
 348         // set up generic variables before further init() calls
 349         opengl_set_variables();
 350
 351         // main GL init
 352         opengl1_init();
 353
 354         mprintf(("\n"));
 355
 356
 357         switch (bpp) {
 358                 case 15:
 359                 case 16:
 360                         gr_screen.bits_per_pixel = 16;
 361                         gr_screen.bytes_per_pixel = 2;
 362
 363                         // screen values
 364                         Gr_red.bits = 5;
 365                         Gr_red.shift = 10;
 366                         Gr_red.scale = 8;
 367                         Gr_red.mask = 0x7C00;
 368
 369                         Gr_green.bits = 5;
 370                         Gr_green.shift = 5;
 371                         Gr_green.scale = 8;
 372                         Gr_green.mask = 0x3E0;
 373
 374                         Gr_blue.bits = 5;
 375                         Gr_blue.shift = 0;
 376                         Gr_blue.scale = 8;
 377                         Gr_blue.mask = 0x1F;
 378
 379                         Gr_alpha.bits = 1;
 380                         Gr_alpha.shift = 15;
 381                         Gr_alpha.scale = 255;
 382                         Gr_alpha.mask = 0x8000;
 383
 384                         break;
 385
 386                 case 24:
 387                 case 32:
 388                         gr_screen.bits_per_pixel = 32;
 389                         gr_screen.bytes_per_pixel = 4;
 390
 391                         // screen values
 392                         Gr_red.bits = 8;
 393                         Gr_red.shift = 16;
 394                         Gr_red.scale = 1;
 395                         Gr_red.mask = 0xff0000;
 396
 397                         Gr_green.bits = 8;
 398                         Gr_green.shift = 8;
 399                         Gr_green.scale = 1;
 400                         Gr_green.mask = 0xff00;
 401
 402                         Gr_blue.bits = 8;
 403                         Gr_blue.shift = 0;
 404                         Gr_blue.scale = 1;
 405                         Gr_blue.mask = 0xff;
 406
 407                         Gr_alpha.bits = 8;
 408                         Gr_alpha.shift = 24;
 409                         Gr_alpha.scale = 1;
 410                         Gr_alpha.mask = 0xff000000;
 411
 412                         break;
 413
 414                 default:
 415                         Int3(); // Illegal bpp
 416                         break;
 417         }
 418
 419         // DDOI - set these so no one else does!
 420         // texture values, always 1555 - 16-bit
 421         Gr_t_red.mask = 0x7C00;
 422         Gr_t_red.shift = 10;
 423         Gr_t_red.scale = 8;
 424
 425         Gr_t_green.mask = 0x3E0;
 426         Gr_t_green.shift = 5;
 427         Gr_t_green.scale = 8;
 428
 429         Gr_t_blue.mask = 0x1F;
 430         Gr_t_blue.shift = 0;
 431         Gr_t_blue.scale = 8;
 432
 433         Gr_t_alpha.mask = 0x8000;
 434         Gr_t_alpha.scale = 255;
 435         Gr_t_alpha.shift = 15;
 436
 437         // alpha-texture values
 438         Gr_ta_red.mask = 0x0f00;
 439         Gr_ta_red.shift = 8;
 440         Gr_ta_red.scale = 16;
 441
 442         Gr_ta_green.mask = 0x00f0;
 443         Gr_ta_green.shift = 4;
 444         Gr_ta_green.scale = 16;
 445
 446         Gr_ta_blue.mask = 0x000f;
 447         Gr_ta_blue.shift = 0;
 448         Gr_ta_blue.scale = 16;
 449
 450         Gr_ta_alpha.mask = 0xf000;
 451         Gr_ta_alpha.shift = 12;
 452         Gr_ta_alpha.scale = 16;
 453
 454         // default to screen
 455         Gr_current_red = &Gr_red;
 456         Gr_current_blue = &Gr_blue;
 457         Gr_current_green = &Gr_green;
 458         Gr_current_alpha = &Gr_alpha;
 459
 460         Mouse_hidden++;
 461         gr_reset_clip();
 462         gr_clear();
 463         gr_flip();
 464         Mouse_hidden--;
 465 }