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         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         return tmp;
 250 }
 251
 252 void gr_opengl_cleanup()
 253 {
 254         opengl1_cleanup();
 255
 256         opengl_free_render_buffer();
 257 }
 258
 259 void gr_opengl_init()
 260 {
 261         if ( OGL_inited )       {
 262                 gr_opengl_cleanup();
 263                 OGL_inited = false;
 264         }
 265
 266         mprintf(( "Initializing OpenGL graphics device...\n" ));
 267
 268         OGL_inited = true;
 269
 270         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 271                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 272         }
 273
 274         int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
 275
 276         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 277         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 278         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 279         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 280         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 281         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
 282
 283         FSAA = os_config_read_uint(NULL, "FSAA", 2);
 284
 285         if (FSAA) {
 286             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 287             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 288         }
 289
 290         GL_window = SDL_CreateWindow(Osreg_title, SDL_WINDOWPOS_CENTERED,
 291                                                 SDL_WINDOWPOS_CENTERED,
 292                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 293
 294         if ( !GL_window ) {
 295                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 296         }
 297
 298         GL_context = SDL_GL_CreateContext(GL_window);
 299
 300         const char *gl_version = (const char*)glGetString(GL_VERSION);
 301         int v_major = 0, v_minor = 0;
 302
 303         sscanf(gl_version, "%d.%d", &v_major, &v_minor);
 304
 305         GL_version = (v_major * 10) + v_minor;
 306
 307         // version check, require 1.2+ for sake of simplicity
 308         if (GL_version < 12) {
 309                 Error(LOCATION, "Minimum OpenGL version is 1.2!");
 310         }
 311
 312         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 313         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 314         mprintf(("  Version  : %s\n", gl_version));
 315
 316         mprintf(("  Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 317
 318         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 319         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 320         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 321         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 322         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 323         SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
 324         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 325
 326         mprintf(("  Attributes received:  ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 327
 328
 329         SDL_ShowCursor(0);
 330
 331         // initial setup viewport
 332         gr_opengl_set_viewport(gr_screen.max_w, gr_screen.max_h);
 333
 334         // maybe go fullscreen - should be done *after* initial viewport setup
 335         int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
 336         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 337                 int flag = SDL_WINDOW_FULLSCREEN_DESKTOP;
 338
 339                 if (fullscreen == 2) {
 340                         flag = SDL_WINDOW_FULLSCREEN;
 341                 }
 342
 343                 SDL_SetWindowFullscreen(GL_window, flag);
 344         }
 345
 346         // set up generic variables before further init() calls
 347         opengl_set_variables();
 348
 349 //      if (v_major >= 2) {
 350 //              opengl2_init();
 351 //      } else {
 352                 opengl1_init();
 353 //      }
 354
 355         mprintf(("\n"));
 356
 357         extern int D3D_enabled;
 358         D3D_enabled = 1;
 359
 360 bpp = 16;
 361         switch (bpp) {
 362                 case 15:
 363                 case 16:
 364                         gr_screen.bits_per_pixel = 16;
 365                         gr_screen.bytes_per_pixel = 2;
 366
 367                         Gr_red.bits = 5;
 368                         Gr_red.shift = 10;
 369                         Gr_red.scale = 8;
 370                         Gr_red.mask = 0x7C00;
 371
 372                         Gr_green.bits = 5;
 373                         Gr_green.shift = 5;
 374                         Gr_green.scale = 8;
 375                         Gr_green.mask = 0x3E0;
 376
 377                         Gr_blue.bits = 5;
 378                         Gr_blue.shift = 0;
 379                         Gr_blue.scale = 8;
 380                         Gr_blue.mask = 0x1F;
 381
 382                         Gr_alpha.bits = 1;
 383                         Gr_alpha.shift = 15;
 384                         Gr_alpha.scale = 255;
 385                         Gr_alpha.mask = 0x8000;
 386
 387                         break;
 388
 389                 case 24:
 390                 case 32:
 391                         gr_screen.bits_per_pixel = 32;
 392                         gr_screen.bytes_per_pixel = 4;
 393
 394                         Gr_red.bits = 8;
 395                         Gr_red.shift = 16;
 396                         Gr_red.scale = 1;
 397                         Gr_red.mask = 0xff0000;
 398
 399                         Gr_green.bits = 8;
 400                         Gr_green.shift = 8;
 401                         Gr_green.scale = 1;
 402                         Gr_green.mask = 0xff00;
 403
 404                         Gr_blue.bits = 8;
 405                         Gr_blue.shift = 0;
 406                         Gr_blue.scale = 1;
 407                         Gr_blue.mask = 0xff;
 408
 409                         Gr_alpha.bits = 8;
 410                         Gr_alpha.shift = 24;
 411                         Gr_alpha.scale = 1;
 412                         Gr_alpha.mask = 0xff000000;
 413
 414                         break;
 415
 416                 default:
 417                         Int3(); // Illegal bpp
 418                         break;
 419         }
 420
 421         // DDOI - set these so no one else does!
 422         Gr_t_red.mask = Gr_red.mask;
 423         Gr_t_red.shift = Gr_red.shift;
 424         Gr_t_red.scale = Gr_red.scale;
 425
 426         Gr_t_green.mask = Gr_green.mask;
 427         Gr_t_green.shift = Gr_green.shift;
 428         Gr_t_green.scale = Gr_green.scale;
 429
 430         Gr_t_blue.mask = Gr_blue.mask;
 431         Gr_t_blue.shift = Gr_blue.shift;
 432         Gr_t_blue.scale = Gr_blue.scale;
 433
 434         Gr_t_alpha.mask = Gr_alpha.mask;
 435         Gr_t_alpha.scale = Gr_alpha.scale;
 436         Gr_t_alpha.shift = Gr_alpha.shift;
 437
 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         Gr_current_red = &Gr_red;
 455         Gr_current_blue = &Gr_blue;
 456         Gr_current_green = &Gr_green;
 457         Gr_current_alpha = &Gr_alpha;
 458
 459         Mouse_hidden++;
 460         gr_reset_clip();
 461         gr_clear();
 462         gr_flip();
 463         Mouse_hidden--;
 464 }