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 #include "osapi.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         SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 128 }
 129
 130 void gr_opengl_toggle_fullscreen()
 131 {
 132         Uint32 flags = SDL_GetWindowFlags(GL_window);
 133
 134         if ( (flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP ) {
 135                 gr_opengl_force_windowed();
 136         } else {
 137                 gr_opengl_force_fullscreen();
 138         }
 139 }
 140
 141 void gr_opengl_set_color_fast(color *dst)
 142 {
 143         if ( dst->screen_sig != gr_screen.signature )   {
 144                 if ( dst->is_alphacolor )       {
 145                         gr_opengl_init_alphacolor( dst, dst->red, dst->green, dst->blue, dst->alpha, dst->ac_type );
 146                 } else {
 147                         gr_opengl_init_color( dst, dst->red, dst->green, dst->blue );
 148                 }
 149         }
 150         gr_screen.current_color = *dst;
 151 }
 152
 153 void gr_opengl_get_color( int * r, int * g, int * b )
 154 {
 155         if (r) *r = gr_screen.current_color.red;
 156         if (g) *g = gr_screen.current_color.green;
 157         if (b) *b = gr_screen.current_color.blue;
 158 }
 159
 160 void gr_opengl_init_color(color *c, int r, int g, int b)
 161 {
 162         c->screen_sig = gr_screen.signature;
 163         c->red = (unsigned char)r;
 164         c->green = (unsigned char)g;
 165         c->blue = (unsigned char)b;
 166         c->alpha = 255;
 167         c->ac_type = AC_TYPE_NONE;
 168         c->alphacolor = -1;
 169         c->is_alphacolor = 0;
 170         c->magic = 0xAC01;
 171 }
 172
 173 void gr_opengl_init_alphacolor( color *clr, int r, int g, int b, int alpha, int type )
 174 {
 175         if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
 176         if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
 177         if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
 178         if ( alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
 179
 180         gr_opengl_init_color( clr, r, g, b );
 181
 182         clr->alpha = (unsigned char)alpha;
 183         clr->ac_type = (ubyte)type;
 184         clr->alphacolor = -1;
 185         clr->is_alphacolor = 1;
 186 }
 187
 188 void gr_opengl_set_color( int r, int g, int b )
 189 {
 190         SDL_assert((r >= 0) && (r < 256));
 191         SDL_assert((g >= 0) && (g < 256));
 192         SDL_assert((b >= 0) && (b < 256));
 193
 194         gr_opengl_init_color( &gr_screen.current_color, r, g, b );
 195 }
 196
 197 void gr_opengl_set_clear_color(int r, int g, int b)
 198 {
 199         gr_opengl_init_color(&gr_screen.current_clear_color, r, g, b);
 200 }
 201
 202 void gr_opengl_set_bitmap(int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy)
 203 {
 204         gr_screen.current_alpha = alpha;
 205         gr_screen.current_alphablend_mode = alphablend_mode;
 206         gr_screen.current_bitblt_mode = bitblt_mode;
 207         gr_screen.current_bitmap = bitmap_num;
 208
 209         gr_screen.current_bitmap_sx = sx;
 210         gr_screen.current_bitmap_sy = sy;
 211 }
 212
 213 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
 214 {
 215         shade->screen_sig = gr_screen.signature;
 216         shade->r = r;
 217         shade->g = g;
 218         shade->b = b;
 219         shade->c = c;
 220 }
 221
 222 void gr_opengl_set_shader( shader * shade )
 223 {
 224         if ( shade )    {
 225                 if (shade->screen_sig != gr_screen.signature)   {
 226                         gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
 227                 }
 228                 gr_screen.current_shader = *shade;
 229         } else {
 230                 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
 231         }
 232 }
 233
 234 int gr_opengl_zbuffer_get()
 235 {
 236         if ( !Gr_global_zbuffering ) {
 237                 return GR_ZBUFF_NONE;
 238         }
 239
 240         return Gr_zbuffering_mode;
 241 }
 242
 243 int gr_opengl_zbuffer_set(int mode)
 244 {
 245         int tmp = Gr_zbuffering_mode;
 246
 247         Gr_zbuffering_mode = mode;
 248
 249         if (Gr_zbuffering_mode == GR_ZBUFF_NONE) {
 250                 Gr_zbuffering = 0;
 251         } else {
 252                 Gr_zbuffering = 1;
 253         }
 254
 255         return tmp;
 256 }
 257
 258 void gr_opengl_cleanup()
 259 {
 260         opengl1_cleanup();
 261
 262         opengl_free_render_buffer();
 263 }
 264
 265 void gr_opengl_init()
 266 {
 267         if ( OGL_inited )       {
 268                 gr_opengl_cleanup();
 269                 OGL_inited = false;
 270         }
 271
 272         mprintf(( "Initializing OpenGL graphics device...\n" ));
 273
 274         OGL_inited = true;
 275
 276         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 277                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 278         }
 279
 280         int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
 281
 282         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 283         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 284         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 285         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 286         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 287         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
 288
 289         FSAA = os_config_read_uint(NULL, "FSAA", 0);
 290
 291         if (FSAA) {
 292             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 293             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 294         }
 295
 296         GL_window = SDL_CreateWindow(Osreg_title, SDL_WINDOWPOS_CENTERED,
 297                                                 SDL_WINDOWPOS_CENTERED,
 298                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 299
 300         if ( !GL_window ) {
 301                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 302         }
 303
 304         GL_context = SDL_GL_CreateContext(GL_window);
 305
 306         const char *gl_version = (const char*)glGetString(GL_VERSION);
 307         int v_major = 0, v_minor = 0;
 308
 309         sscanf(gl_version, "%d.%d", &v_major, &v_minor);
 310
 311         GL_version = (v_major * 10) + v_minor;
 312
 313         // version check, require 1.2+ for sake of simplicity
 314         if (GL_version < 12) {
 315                 Error(LOCATION, "Minimum OpenGL version is 1.2!");
 316         }
 317
 318         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 319         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 320         mprintf(("  Version  : %s\n", gl_version));
 321
 322         mprintf(("  Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 323
 324         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 325         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 326         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 327         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 328         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 329         SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
 330         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 331
 332         mprintf(("  Attributes received : ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 333
 334
 335         SDL_DisableScreenSaver();
 336         SDL_ShowCursor(0);
 337
 338         // initial viewport setup
 339         gr_opengl_set_viewport(gr_screen.max_w, gr_screen.max_h);
 340
 341         // set up generic variables before further init() calls
 342         opengl_set_variables();
 343
 344         // main GL init
 345         opengl1_init();
 346
 347         // maybe go fullscreen - should be done *after* main GL init
 348         int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
 349         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 350                 SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 351                 // poll for window events
 352                 os_poll();
 353         }
 354
 355         mprintf(("\n"));
 356
 357
 358         switch (bpp) {
 359                 case 15:
 360                 case 16:
 361                         gr_screen.bits_per_pixel = 16;
 362                         gr_screen.bytes_per_pixel = 2;
 363
 364                         // screen values
 365                         Gr_red.bits = 5;
 366                         Gr_red.shift = 10;
 367                         Gr_red.scale = 8;
 368                         Gr_red.mask = 0x7C00;
 369
 370                         Gr_green.bits = 5;
 371                         Gr_green.shift = 5;
 372                         Gr_green.scale = 8;
 373                         Gr_green.mask = 0x3E0;
 374
 375                         Gr_blue.bits = 5;
 376                         Gr_blue.shift = 0;
 377                         Gr_blue.scale = 8;
 378                         Gr_blue.mask = 0x1F;
 379
 380                         Gr_alpha.bits = 1;
 381                         Gr_alpha.shift = 15;
 382                         Gr_alpha.scale = 255;
 383                         Gr_alpha.mask = 0x8000;
 384
 385                         break;
 386
 387                 case 24:
 388                 case 32:
 389                         gr_screen.bits_per_pixel = 32;
 390                         gr_screen.bytes_per_pixel = 4;
 391
 392                         // screen values
 393                         Gr_red.bits = 8;
 394                         Gr_red.shift = 16;
 395                         Gr_red.scale = 1;
 396                         Gr_red.mask = 0xff0000;
 397
 398                         Gr_green.bits = 8;
 399                         Gr_green.shift = 8;
 400                         Gr_green.scale = 1;
 401                         Gr_green.mask = 0xff00;
 402
 403                         Gr_blue.bits = 8;
 404                         Gr_blue.shift = 0;
 405                         Gr_blue.scale = 1;
 406                         Gr_blue.mask = 0xff;
 407
 408                         Gr_alpha.bits = 8;
 409                         Gr_alpha.shift = 24;
 410                         Gr_alpha.scale = 1;
 411                         Gr_alpha.mask = 0xff000000;
 412
 413                         break;
 414
 415                 default:
 416                         Int3(); // Illegal bpp
 417                         break;
 418         }
 419
 420         // DDOI - set these so no one else does!
 421         // texture values, always 1555 - 16-bit
 422         Gr_t_red.mask = 0x7C00;
 423         Gr_t_red.shift = 10;
 424         Gr_t_red.scale = 8;
 425
 426         Gr_t_green.mask = 0x3E0;
 427         Gr_t_green.shift = 5;
 428         Gr_t_green.scale = 8;
 429
 430         Gr_t_blue.mask = 0x1F;
 431         Gr_t_blue.shift = 0;
 432         Gr_t_blue.scale = 8;
 433
 434         Gr_t_alpha.mask = 0x8000;
 435         Gr_t_alpha.scale = 255;
 436         Gr_t_alpha.shift = 15;
 437
 438         // alpha-texture values
 439         Gr_ta_red.mask = 0x0f00;
 440         Gr_ta_red.shift = 8;
 441         Gr_ta_red.scale = 16;
 442
 443         Gr_ta_green.mask = 0x00f0;
 444         Gr_ta_green.shift = 4;
 445         Gr_ta_green.scale = 16;
 446
 447         Gr_ta_blue.mask = 0x000f;
 448         Gr_ta_blue.shift = 0;
 449         Gr_ta_blue.scale = 16;
 450
 451         Gr_ta_alpha.mask = 0xf000;
 452         Gr_ta_alpha.shift = 12;
 453         Gr_ta_alpha.scale = 16;
 454
 455         // default to screen
 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 }