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 "gropengl2.h"
  14 #include "gropenglinternal.h"
  15 #include "2d.h"
  16 #include "bmpman.h"
  17 #include "grinternal.h"
  18 #include "cmdline.h"
  19 #include "mouse.h"
  20
  21
  22 bool OGL_inited = false;
  23 int GL_version = 0;
  24
  25 SDL_Window *GL_window = NULL;
  26 SDL_GLContext GL_context;
  27
  28 static int FSAA = 0;
  29
  30 int GL_viewport_x = 0;
  31 int GL_viewport_y = 0;
  32 int GL_viewport_w = 640;
  33 int GL_viewport_h = 480;
  34 float GL_viewport_scale_w = 1.0f;
  35 float GL_viewport_scale_h = 1.0f;
  36 int GL_min_texture_width = 0;
  37 int GL_max_texture_width = 0;
  38 int GL_min_texture_height = 0;
  39 int GL_max_texture_height = 0;
  40
  41 rb_t *render_buffer = NULL;
  42 static size_t render_buffer_size = 0;
  43
  44
  45 void opengl_alloc_render_buffer(unsigned int nelems)
  46 {
  47         if (nelems < 0) {
  48                 nelems = 1;
  49         }
  50
  51         if ( render_buffer && (nelems <= render_buffer_size) ) {
  52                 return;
  53         }
  54
  55         if (render_buffer) {
  56                 free(render_buffer);
  57         }
  58
  59         render_buffer = (rb_t*) malloc(sizeof(rb_t) * nelems);
  60         render_buffer_size = nelems;
  61 }
  62
  63 void opengl_free_render_buffer()
  64 {
  65         if (render_buffer) {
  66                 free(render_buffer);
  67                 render_buffer = NULL;
  68                 render_buffer_size = 0;
  69         }
  70 }
  71
  72 static void opengl_set_variables()
  73 {
  74         GL_min_texture_height = 16;
  75         GL_min_texture_width = 16;
  76
  77         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
  78         GL_max_texture_height = GL_max_texture_width;
  79
  80         // no texture is larger than 1024, so maybe don't use sections
  81         if (GL_max_texture_width >= 1024) {
  82                 gr_screen.use_sections = 0;
  83         }
  84 }
  85
  86 void gr_opengl_set_viewport(int width, int height)
  87 {
  88         int w, h, x, y;
  89
  90         float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
  91
  92         w = width;
  93         h = i2fl((width / ratio) + 0.5f);
  94
  95         if (h > height) {
  96                 h = height;
  97                 w = i2fl((height * ratio) + 0.5f);
  98         }
  99
 100         x = (width - w) / 2;
 101         y = (height - h) / 2;
 102
 103         GL_viewport_x = x;
 104         GL_viewport_y = y;
 105         GL_viewport_w = w;
 106         GL_viewport_h = h;
 107         GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
 108         GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
 109
 110         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
 111
 112         glMatrixMode(GL_PROJECTION);
 113         glLoadIdentity();
 114         glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
 115         glMatrixMode(GL_MODELVIEW);
 116         glLoadIdentity();
 117         glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
 118 }
 119
 120 void gr_opengl_force_windowed()
 121 {
 122         SDL_SetWindowFullscreen(GL_window, 0);
 123 }
 124
 125 void gr_opengl_force_fullscreen()
 126 {
 127         int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
 128         int flag = SDL_WINDOW_FULLSCREEN_DESKTOP;
 129
 130         if (fullscreen == 2) {
 131                 flag = SDL_WINDOW_FULLSCREEN;
 132         }
 133
 134         SDL_SetWindowFullscreen(GL_window, flag);
 135 }
 136
 137 void gr_opengl_set_color_fast(color *dst)
 138 {
 139         if ( dst->screen_sig != gr_screen.signature )   {
 140                 if ( dst->is_alphacolor )       {
 141                         gr_opengl_init_alphacolor( dst, dst->red, dst->green, dst->blue, dst->alpha, dst->ac_type );
 142                 } else {
 143                         gr_opengl_init_color( dst, dst->red, dst->green, dst->blue );
 144                 }
 145         }
 146         gr_screen.current_color = *dst;
 147 }
 148
 149 void gr_opengl_get_color( int * r, int * g, int * b )
 150 {
 151         if (r) *r = gr_screen.current_color.red;
 152         if (g) *g = gr_screen.current_color.green;
 153         if (b) *b = gr_screen.current_color.blue;
 154 }
 155
 156 void gr_opengl_init_color(color *c, int r, int g, int b)
 157 {
 158         c->screen_sig = gr_screen.signature;
 159         c->red = (unsigned char)r;
 160         c->green = (unsigned char)g;
 161         c->blue = (unsigned char)b;
 162         c->alpha = 255;
 163         c->ac_type = AC_TYPE_NONE;
 164         c->alphacolor = -1;
 165         c->is_alphacolor = 0;
 166         c->magic = 0xAC01;
 167 }
 168
 169 void gr_opengl_init_alphacolor( color *clr, int r, int g, int b, int alpha, int type )
 170 {
 171         if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
 172         if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
 173         if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
 174         if ( alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
 175
 176         gr_opengl_init_color( clr, r, g, b );
 177
 178         clr->alpha = (unsigned char)alpha;
 179         clr->ac_type = (ubyte)type;
 180         clr->alphacolor = -1;
 181         clr->is_alphacolor = 1;
 182 }
 183
 184 void gr_opengl_set_color( int r, int g, int b )
 185 {
 186         SDL_assert((r >= 0) && (r < 256));
 187         SDL_assert((g >= 0) && (g < 256));
 188         SDL_assert((b >= 0) && (b < 256));
 189
 190         gr_opengl_init_color( &gr_screen.current_color, r, g, b );
 191 }
 192
 193 void gr_opengl_set_clear_color(int r, int g, int b)
 194 {
 195         gr_opengl_init_color(&gr_screen.current_clear_color, r, g, b);
 196 }
 197
 198 void gr_opengl_set_bitmap(int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy)
 199 {
 200         gr_screen.current_alpha = alpha;
 201         gr_screen.current_alphablend_mode = alphablend_mode;
 202         gr_screen.current_bitblt_mode = bitblt_mode;
 203         gr_screen.current_bitmap = bitmap_num;
 204
 205         gr_screen.current_bitmap_sx = sx;
 206         gr_screen.current_bitmap_sy = sy;
 207 }
 208
 209 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
 210 {
 211         shade->screen_sig = gr_screen.signature;
 212         shade->r = r;
 213         shade->g = g;
 214         shade->b = b;
 215         shade->c = c;
 216 }
 217
 218 void gr_opengl_set_shader( shader * shade )
 219 {
 220         if ( shade )    {
 221                 if (shade->screen_sig != gr_screen.signature)   {
 222                         gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
 223                 }
 224                 gr_screen.current_shader = *shade;
 225         } else {
 226                 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
 227         }
 228 }
 229
 230 int gr_opengl_zbuffer_get()
 231 {
 232         if ( !Gr_global_zbuffering ) {
 233                 return GR_ZBUFF_NONE;
 234         }
 235
 236         return Gr_zbuffering_mode;
 237 }
 238
 239 int gr_opengl_zbuffer_set(int mode)
 240 {
 241         int tmp = Gr_zbuffering_mode;
 242
 243         Gr_zbuffering_mode = mode;
 244
 245         if (Gr_zbuffering_mode == GR_ZBUFF_NONE) {
 246                 Gr_zbuffering = 0;
 247         } else {
 248                 Gr_zbuffering = 1;
 249         }
 250
 251         return tmp;
 252 }
 253
 254 void gr_opengl_cleanup()
 255 {
 256         opengl1_cleanup();
 257
 258         opengl_free_render_buffer();
 259 }
 260
 261 void gr_opengl_init()
 262 {
 263         if ( OGL_inited )       {
 264                 gr_opengl_cleanup();
 265                 OGL_inited = false;
 266         }
 267
 268         mprintf(( "Initializing OpenGL graphics device...\n" ));
 269
 270         OGL_inited = true;
 271
 272         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 273                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 274         }
 275
 276         int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
 277
 278         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 279         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 280         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 281         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 282         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 283         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
 284
 285         FSAA = os_config_read_uint(NULL, "FSAA", 2);
 286
 287         if (FSAA) {
 288             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 289             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 290         }
 291
 292         GL_window = SDL_CreateWindow(Osreg_title, SDL_WINDOWPOS_CENTERED,
 293                                                 SDL_WINDOWPOS_CENTERED,
 294                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 295
 296         if ( !GL_window ) {
 297                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 298         }
 299
 300         GL_context = SDL_GL_CreateContext(GL_window);
 301
 302         const char *gl_version = (const char*)glGetString(GL_VERSION);
 303         int v_major = 0, v_minor = 0;
 304
 305         sscanf(gl_version, "%d.%d", &v_major, &v_minor);
 306
 307         GL_version = (v_major * 10) + v_minor;
 308
 309         // version check, require 1.2+ for sake of simplicity
 310         if (GL_version < 12) {
 311                 Error(LOCATION, "Minimum OpenGL version is 1.2!");
 312         }
 313
 314         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 315         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 316         mprintf(("  Version  : %s\n", gl_version));
 317
 318         mprintf(("  Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 319
 320         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 321         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 322         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 323         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 324         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 325         SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
 326         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 327
 328         mprintf(("  Attributes received:  ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 329
 330
 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 //      if (v_major >= 2) {
 352 //              opengl2_init();
 353 //      } else {
 354                 opengl1_init();
 355 //      }
 356
 357         mprintf(("\n"));
 358
 359         extern int D3D_enabled;
 360         D3D_enabled = 1;
 361
 362 bpp = 16;
 363         switch (bpp) {
 364                 case 15:
 365                 case 16:
 366                         gr_screen.bits_per_pixel = 16;
 367                         gr_screen.bytes_per_pixel = 2;
 368
 369                         Gr_red.bits = 5;
 370                         Gr_red.shift = 10;
 371                         Gr_red.scale = 8;
 372                         Gr_red.mask = 0x7C00;
 373
 374                         Gr_green.bits = 5;
 375                         Gr_green.shift = 5;
 376                         Gr_green.scale = 8;
 377                         Gr_green.mask = 0x3E0;
 378
 379                         Gr_blue.bits = 5;
 380                         Gr_blue.shift = 0;
 381                         Gr_blue.scale = 8;
 382                         Gr_blue.mask = 0x1F;
 383
 384                         Gr_alpha.bits = 1;
 385                         Gr_alpha.shift = 15;
 386                         Gr_alpha.scale = 255;
 387                         Gr_alpha.mask = 0x8000;
 388
 389                         break;
 390
 391                 case 24:
 392                 case 32:
 393                         gr_screen.bits_per_pixel = 32;
 394                         gr_screen.bytes_per_pixel = 4;
 395
 396                         Gr_red.bits = 8;
 397                         Gr_red.shift = 16;
 398                         Gr_red.scale = 1;
 399                         Gr_red.mask = 0xff0000;
 400
 401                         Gr_green.bits = 8;
 402                         Gr_green.shift = 8;
 403                         Gr_green.scale = 1;
 404                         Gr_green.mask = 0xff00;
 405
 406                         Gr_blue.bits = 8;
 407                         Gr_blue.shift = 0;
 408                         Gr_blue.scale = 1;
 409                         Gr_blue.mask = 0xff;
 410
 411                         Gr_alpha.bits = 8;
 412                         Gr_alpha.shift = 24;
 413                         Gr_alpha.scale = 1;
 414                         Gr_alpha.mask = 0xff000000;
 415
 416                         break;
 417
 418                 default:
 419                         Int3(); // Illegal bpp
 420                         break;
 421         }
 422
 423         // DDOI - set these so no one else does!
 424         Gr_t_red.mask = Gr_red.mask;
 425         Gr_t_red.shift = Gr_red.shift;
 426         Gr_t_red.scale = Gr_red.scale;
 427
 428         Gr_t_green.mask = Gr_green.mask;
 429         Gr_t_green.shift = Gr_green.shift;
 430         Gr_t_green.scale = Gr_green.scale;
 431
 432         Gr_t_blue.mask = Gr_blue.mask;
 433         Gr_t_blue.shift = Gr_blue.shift;
 434         Gr_t_blue.scale = Gr_blue.scale;
 435
 436         Gr_t_alpha.mask = Gr_alpha.mask;
 437         Gr_t_alpha.scale = Gr_alpha.scale;
 438         Gr_t_alpha.shift = Gr_alpha.shift;
 439
 440         Gr_ta_red.mask = 0x0f00;
 441         Gr_ta_red.shift = 8;
 442         Gr_ta_red.scale = 16;
 443
 444         Gr_ta_green.mask = 0x00f0;
 445         Gr_ta_green.shift = 4;
 446         Gr_ta_green.scale = 16;
 447
 448         Gr_ta_blue.mask = 0x000f;
 449         Gr_ta_blue.shift = 0;
 450         Gr_ta_blue.scale = 16;
 451
 452         Gr_ta_alpha.mask = 0xf000;
 453         Gr_ta_alpha.shift = 12;
 454         Gr_ta_alpha.scale = 16;
 455
 456         Gr_current_red = &Gr_red;
 457         Gr_current_blue = &Gr_blue;
 458         Gr_current_green = &Gr_green;
 459         Gr_current_alpha = &Gr_alpha;
 460
 461         Mouse_hidden++;
 462         gr_reset_clip();
 463         gr_clear();
 464         gr_flip();
 465         Mouse_hidden--;
 466 }