arch/ogl/gr.c

   1 /* $Id: gr.c,v 1.41 2005-01-25 19:23:58 schaffner Exp $ */
   2 /*
   3  *
   4  * OGL video functions. - Added 9/15/99 Matthew Mueller
   5  *
   6  *
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include <conf.h>
  11 #endif
  12
  13 #include <stdlib.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #ifdef _MSC_VER
  17 #include <windows.h>
  18 #endif
  19
  20 #if !defined(_MSC_VER) && !defined(macintosh)
  21 #include <unistd.h>
  22 #endif
  23 #if !defined(macintosh)
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #endif
  28
  29 #include <errno.h>
  30
  31 #include "hudmsg.h"
  32 #include "game.h"
  33 #include "text.h"
  34 #include "gr.h"
  35 #include "gamefont.h"
  36 #include "grdef.h"
  37 #include "palette.h"
  38 #include "u_mem.h"
  39 #include "error.h"
  40
  41 #include "inferno.h"
  42 #include "screens.h"
  43
  44 #include "strutil.h"
  45 #include "mono.h"
  46 #include "args.h"
  47 #include "key.h"
  48 #include "physfsx.h"
  49
  50 #define DECLARE_VARS
  51 #include "internal.h"
  52 #if defined(__APPLE__) && defined(__MACH__)
  53 #include <OpenGL/glu.h>
  54 #undef GL_ARB_multitexture // hack!
  55 #else
  56 #include <GL/glu.h>
  57 #endif
  58
  59 int ogl_voodoohack=0;
  60
  61 int gr_installed = 0;
  62
  63
  64 void gr_palette_clear(); // Function prototype for gr_init;
  65 int gl_initialized=0;
  66 int gl_reticle = 0;
  67
  68 int ogl_fullscreen=0;
  69
  70 int gr_check_fullscreen(void){
  71         return ogl_fullscreen;
  72 }
  73
  74 void gr_do_fullscreen(int f){
  75         if (ogl_voodoohack)
  76                 ogl_fullscreen=1;//force fullscreen mode on voodoos.
  77         else
  78                 ogl_fullscreen=f;
  79         if (gl_initialized){
  80                 ogl_do_fullscreen_internal();
  81         }
  82 }
  83
  84 int gr_toggle_fullscreen(void){
  85         gr_do_fullscreen(!ogl_fullscreen);
  86         //      grd_curscreen->sc_mode=0;//hack to get it to reset screen mode
  87         return ogl_fullscreen;
  88 }
  89
  90 int arch_toggle_fullscreen_menu(void){
  91         unsigned char *buf=NULL;
  92
  93         if (ogl_readpixels_ok){
  94                 MALLOC(buf,unsigned char,grd_curscreen->sc_w*grd_curscreen->sc_h*3);
  95                 glReadBuffer(GL_FRONT);
  96                 glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
  97         }
  98
  99         gr_do_fullscreen(!ogl_fullscreen);
 100
 101         if (ogl_readpixels_ok){
 102 //              glWritePixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 103                 glRasterPos2f(0,0);
 104                 glDrawPixels(grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 105                 free(buf);
 106         }
 107         //      grd_curscreen->sc_mode=0;//hack to get it to reset screen mode
 108
 109         return ogl_fullscreen;
 110 }
 111
 112 void ogl_init_state(void){
 113         /* select clearing (background) color   */
 114         glClearColor(0.0, 0.0, 0.0, 0.0);
 115         glShadeModel(GL_SMOOTH);
 116
 117         /* initialize viewing values */
 118         glMatrixMode(GL_PROJECTION);
 119         glLoadIdentity();
 120         glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 121         glScalef(1.0, -1.0, 1.0);
 122         glTranslatef(0.0, -1.0, 0.0);
 123         gr_palette_step_up(0,0,0);//in case its left over from in game
 124 }
 125
 126 int last_screen_mode=-1;
 127
 128 void ogl_set_screen_mode(void){
 129         if (last_screen_mode==Screen_mode)
 130                 return;
 131         OGL_VIEWPORT(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h);
 132 //      OGL_VIEWPORT(grd_curcanv->cv_bitmap.bm_x,grd_curcanv->cv_bitmap.bm_y,grd_curcanv->cv_bitmap.bm_w,grd_curcanv->cv_bitmap.bm_h);
 133         if (Screen_mode==SCREEN_GAME){
 134                 glDrawBuffer(GL_BACK);
 135         }else{
 136                 glClearColor(0.0, 0.0, 0.0, 0.0);
 137                 glDrawBuffer(GL_FRONT);
 138                 glClear(GL_COLOR_BUFFER_BIT);
 139                 glMatrixMode(GL_PROJECTION);
 140                 glLoadIdentity();//clear matrix
 141                 glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 142                 glMatrixMode(GL_MODELVIEW);
 143                 glLoadIdentity();//clear matrix
 144                 glEnable(GL_BLEND);
 145                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 146         }
 147         last_screen_mode=Screen_mode;
 148 }
 149
 150 void gr_update()
 151 {
 152         if (gl_initialized){
 153
 154                 if(Screen_mode != SCREEN_GAME){
 155                         glFlush();
 156                 }
 157         }
 158 }
 159
 160 const char *gl_vendor, *gl_renderer, *gl_version, *gl_extensions;
 161
 162 void ogl_get_verinfo(void)
 163 {
 164         long t, arb_max_textures = -1, sgi_max_textures = -1;
 165 #ifdef GL_NV_register_combiners
 166         long nv_register_combiners = -1;
 167 #endif
 168         float anisotropic_max = 0;
 169
 170         gl_vendor = (const char *) glGetString (GL_VENDOR);
 171         gl_renderer = (const char *) glGetString (GL_RENDERER);
 172         gl_version = (const char *) glGetString (GL_VERSION);
 173         gl_extensions = (const char *) glGetString (GL_EXTENSIONS);
 174
 175         con_printf(CON_VERBOSE, "OpenGL: vendor: %s\nOpenGL: renderer: %s\nOpenGL: version: %s\n",gl_vendor,gl_renderer,gl_version);
 176
 177         ogl_intensity4_ok = 1;
 178         ogl_luminance4_alpha4_ok = 1;
 179         ogl_rgba2_ok = 1;
 180         ogl_gettexlevelparam_ok = 1;
 181         ogl_setgammaramp_ok = 1;
 182
 183 #ifdef WGL_VIDEO
 184         dglMultiTexCoord2fARB = (glMultiTexCoord2fARB_fp)wglGetProcAddress("glMultiTexCoord2fARB");
 185         dglActiveTextureARB = (glActiveTextureARB_fp)wglGetProcAddress("glActiveTextureARB");
 186         dglMultiTexCoord2fSGIS = (glMultiTexCoord2fSGIS_fp)wglGetProcAddress("glMultiTexCoord2fSGIS");
 187         dglSelectTextureSGIS = (glSelectTextureSGIS_fp)wglGetProcAddress("glSelectTextureSGIS");
 188         dglColorTableEXT = (glColorTableEXT_fp)wglGetProcAddress("glColorTableEXT");
 189         dglCombinerParameteriNV = (glCombinerParameteriNV_fp)wglGetProcAddress("glCombinerParameteriNV");
 190         dglCombinerInputNV = (glCombinerInputNV_fp)wglGetProcAddress("glCombinerInputNV");
 191         dglCombinerOutputNV = (glCombinerOutputNV_fp)wglGetProcAddress("glCombinerOutputNV");
 192         dglFinalCombinerInputNV = (glFinalCombinerInputNV_fp)wglGetProcAddress("glFinalCombinerInputNV");
 193 #endif
 194
 195 #ifdef GL_ARB_multitexture
 196         ogl_arb_multitexture_ok = (strstr(gl_extensions, "GL_ARB_multitexture") != 0 && glActiveTextureARB != 0);
 197         mprintf((0,"c:%p d:%p e:%p\n",strstr(gl_extensions,"GL_ARB_multitexture"),glActiveTextureARB,glBegin));
 198 #endif
 199 #ifdef GL_SGIS_multitexture
 200         ogl_sgis_multitexture_ok = (strstr(gl_extensions, "GL_SGIS_multitexture") != 0 && glSelectTextureSGIS != 0);
 201         mprintf((0,"a:%p b:%p\n",strstr(gl_extensions,"GL_SGIS_multitexture"),glSelectTextureSGIS));
 202 #endif
 203         ogl_nv_texture_env_combine4_ok = (strstr(gl_extensions, "GL_NV_texture_env_combine4") != 0);
 204 #ifdef GL_NV_register_combiners
 205         ogl_nv_register_combiners_ok=(strstr(gl_extensions,"GL_NV_register_combiners")!=0 && glCombinerOutputNV!=0);
 206 #endif
 207
 208         ogl_ext_texture_filter_anisotropic_ok = (strstr(gl_extensions, "GL_EXT_texture_filter_anisotropic") != 0);
 209         if (ogl_ext_texture_filter_anisotropic_ok)
 210                 glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &anisotropic_max);
 211
 212 #ifdef GL_EXT_paletted_texture
 213         ogl_paletted_texture_ok = (strstr(gl_extensions, "GL_EXT_paletted_texture") != 0 && glColorTableEXT != 0);
 214         ogl_shared_palette_ok = (strstr(gl_extensions, "GL_EXT_shared_texture_palette") != 0 && ogl_paletted_texture_ok);
 215 #endif
 216         //add driver specific hacks here.  whee.
 217         if ((stricmp(gl_renderer,"Mesa NVIDIA RIVA 1.0\n")==0 || stricmp(gl_renderer,"Mesa NVIDIA RIVA 1.2\n")==0) && stricmp(gl_version,"1.2 Mesa 3.0")==0){
 218                 ogl_intensity4_ok=0;//ignores alpha, always black background instead of transparent.
 219                 ogl_readpixels_ok=0;//either just returns all black, or kills the X server entirely
 220                 ogl_gettexlevelparam_ok=0;//returns random data..
 221         }
 222         if (stricmp(gl_vendor,"Matrox Graphics Inc.")==0){
 223                 //displays garbage. reported by
 224                 //  redomen@crcwnet.com (render="Matrox G400" version="1.1.3 5.52.015")
 225                 //  orulz (Matrox G200)
 226                 ogl_intensity4_ok=0;
 227         }
 228 #ifdef macintosh
 229         if (stricmp(gl_renderer,"3dfx Voodoo 3")==0){ // strangely, includes Voodoo 2
 230                 ogl_gettexlevelparam_ok=0; // Always returns 0
 231         }
 232 #endif
 233
 234         //allow overriding of stuff.
 235 #ifdef GL_ARB_multitexture
 236         if ((t=FindArg("-gl_arb_multitexture_ok"))){
 237                 ogl_arb_multitexture_ok=atoi(Args[t+1]);
 238         }
 239         if (ogl_arb_multitexture_ok)
 240                 glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &arb_max_textures);
 241 #endif
 242 #ifdef GL_SGIS_multitexture
 243         if ((t=FindArg("-gl_sgis_multitexture_ok"))){
 244                 ogl_sgis_multitexture_ok=atoi(Args[t+1]);
 245         }
 246         if (ogl_sgis_multitexture_ok)
 247                 glGetIntegerv(GL_MAX_TEXTURES_SGIS, &sgi_max_textures);
 248 #endif
 249 #ifdef GL_NV_register_combiners
 250         if ((t = FindArg("-gl_nv_register_combiners_ok")))
 251         {
 252                 ogl_nv_register_combiners_ok=atoi(Args[t + 1]);
 253         }
 254         if (ogl_nv_register_combiners_ok)
 255                 glGetIntegerv(GL_MAX_GENERAL_COMBINERS_NV, &nv_register_combiners);
 256 #endif
 257 #ifdef GL_EXT_paletted_texture
 258         if ((t = FindArg("-gl_paletted_texture_ok")))
 259         {
 260                 ogl_paletted_texture_ok = atoi(Args[t + 1]);
 261         }
 262         if ((t = FindArg("-gl_shared_palette_ok")))
 263         {
 264                 ogl_shared_palette_ok = atoi(Args[t + 1]);
 265         }
 266         ogl_shared_palette_ok = ogl_shared_palette_ok && ogl_paletted_texture_ok; // shared palettes require palette support in the first place, obviously ;)
 267         printf("gl_paletted_texture: %i  gl_shared_palette: %i  (using paletted textures: %i)\n", ogl_paletted_texture_ok, ogl_shared_palette_ok, ogl_shared_palette_ok);
 268 #endif
 269         if ((t=FindArg("-gl_intensity4_ok"))){
 270                 ogl_intensity4_ok=atoi(Args[t+1]);
 271         }
 272         if ((t=FindArg("-gl_luminance4_alpha4_ok"))){
 273                 ogl_luminance4_alpha4_ok=atoi(Args[t+1]);
 274         }
 275         if ((t=FindArg("-gl_rgba2_ok"))){
 276                 ogl_rgba2_ok=atoi(Args[t+1]);
 277         }
 278         if ((t=FindArg("-gl_readpixels_ok"))){
 279                 ogl_readpixels_ok=atoi(Args[t+1]);
 280         }
 281         if ((t=FindArg("-gl_gettexlevelparam_ok"))){
 282                 ogl_gettexlevelparam_ok=atoi(Args[t+1]);
 283         }
 284         if ((t=FindArg("-gl_setgammaramp_ok")))
 285         {
 286                 ogl_setgammaramp_ok = atoi(Args[t + 1]);
 287         }
 288
 289         con_printf(CON_VERBOSE, "gl_arb_multitexture:%i(%i units) gl_sgis_multitexture:%i(%i units) gl_nv_texture_env_combine4:%i\n", ogl_arb_multitexture_ok, arb_max_textures, ogl_sgis_multitexture_ok, sgi_max_textures, ogl_nv_texture_env_combine4_ok);
 290 #ifdef GL_NV_register_combiners
 291         con_printf(CON_VERBOSE, "gl_nv_register_combiners:%i(%i stages)\n", ogl_nv_register_combiners_ok, nv_register_combiners);
 292 #endif
 293         con_printf(CON_VERBOSE, "gl_intensity4:%i gl_luminance4_alpha4:%i gl_rgba2:%i gl_readpixels:%i gl_gettexlevelparam:%i gl_setgammaramp_ok:%i gl_ext_texture_filter_anisotropic:%i(%f max)\n", ogl_intensity4_ok, ogl_luminance4_alpha4_ok, ogl_rgba2_ok, ogl_readpixels_ok, ogl_gettexlevelparam_ok, ogl_setgammaramp_ok, ogl_ext_texture_filter_anisotropic_ok, anisotropic_max);
 294 }
 295
 296
 297 int gr_check_mode(u_int32_t mode)
 298 {
 299         int w, h;
 300
 301         w = SM_W(mode);
 302         h = SM_H(mode);
 303         return ogl_check_mode(w, h); // platform specific code
 304 }
 305
 306
 307 extern int VGA_current_mode; // DPH: kludge - remove at all costs
 308
 309 int gr_set_mode(u_int32_t mode)
 310 {
 311         unsigned int w,h;
 312         char *gr_bm_data;
 313
 314 #ifdef NOGRAPH
 315 return 0;
 316 #endif
 317 //      mode=0;
 318         if (mode<=0)
 319                 return 0;
 320
 321         w=SM_W(mode);
 322         h=SM_H(mode);
 323         VGA_current_mode = mode;
 324
 325         //if (screen != NULL) gr_palette_clear();
 326
 327 //      ogl_init_state();
 328
 329         gr_bm_data=(char *)grd_curscreen->sc_canvas.cv_bitmap.bm_data;//since we use realloc, we want to keep this pointer around.
 330         memset( grd_curscreen, 0, sizeof(grs_screen));
 331         grd_curscreen->sc_mode = mode;
 332         grd_curscreen->sc_w = w;
 333         grd_curscreen->sc_h = h;
 334         grd_curscreen->sc_aspect = fixdiv(grd_curscreen->sc_w*3,grd_curscreen->sc_h*4);
 335         grd_curscreen->sc_canvas.cv_bitmap.bm_x = 0;
 336         grd_curscreen->sc_canvas.cv_bitmap.bm_y = 0;
 337         grd_curscreen->sc_canvas.cv_bitmap.bm_w = w;
 338         grd_curscreen->sc_canvas.cv_bitmap.bm_h = h;
 339         //grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = screen->pitch;
 340         grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = w;
 341         grd_curscreen->sc_canvas.cv_bitmap.bm_type = BM_OGL;
 342         //grd_curscreen->sc_canvas.cv_bitmap.bm_data = (unsigned char *)screen->pixels;
 343 //      mprintf((0,"ogl/gr.c: reallocing %p to %i\n",grd_curscreen->sc_canvas.cv_bitmap.bm_data,w*h));
 344         grd_curscreen->sc_canvas.cv_bitmap.bm_data = d_realloc(gr_bm_data,w*h);
 345         gr_set_current_canvas(NULL);
 346         //gr_enable_default_palette_loading();
 347
 348         ogl_init_window(w,h);//platform specific code
 349
 350         ogl_get_verinfo();
 351
 352         OGL_VIEWPORT(0,0,w,h);
 353
 354         ogl_set_screen_mode();
 355
 356 //      gamefont_choose_game_font(w,h);
 357
 358         return 0;
 359 }
 360
 361 #define GLstrcmptestr(a,b) if (stricmp(a,#b)==0 || stricmp(a,"GL_" #b)==0)return GL_ ## b;
 362 int ogl_atotexfilti(char *a,int min){
 363         GLstrcmptestr(a,NEAREST);
 364         GLstrcmptestr(a,LINEAR);
 365         if (min){//mipmaps are valid only for the min filter
 366                 GLstrcmptestr(a,NEAREST_MIPMAP_NEAREST);
 367                 GLstrcmptestr(a,NEAREST_MIPMAP_LINEAR);
 368                 GLstrcmptestr(a,LINEAR_MIPMAP_NEAREST);
 369                 GLstrcmptestr(a,LINEAR_MIPMAP_LINEAR);
 370         }
 371         Error("unknown/invalid texture filter %s\n",a);
 372 //      return GL_NEAREST;
 373 }
 374 int ogl_testneedmipmaps(int i){
 375         switch (i){
 376                 case GL_NEAREST:
 377                 case GL_LINEAR:
 378                         return 0;
 379                 case GL_NEAREST_MIPMAP_NEAREST:
 380                 case GL_NEAREST_MIPMAP_LINEAR:
 381                 case GL_LINEAR_MIPMAP_NEAREST:
 382                 case GL_LINEAR_MIPMAP_LINEAR:
 383                         return 1;
 384         }
 385         Error("unknown texture filter %x\n",i);
 386 //      return -1;
 387 }
 388 #ifdef OGL_RUNTIME_LOAD
 389 #ifdef _WIN32
 390 char *OglLibPath="opengl32.dll";
 391 #endif
 392 #ifdef __unix__
 393 char *OglLibPath="libGL.so";
 394 #endif
 395 #ifdef macintosh
 396 char *OglLibPath = NULL;
 397 #endif
 398
 399 int ogl_rt_loaded=0;
 400 int ogl_init_load_library(void)
 401 {
 402         int retcode=0;
 403         if (!ogl_rt_loaded){
 404                 int t;
 405                 if ((t=FindArg("-gl_library")))
 406                         OglLibPath=Args[t+1];
 407
 408                 retcode = OpenGL_LoadLibrary(true);
 409                 if(retcode)
 410                 {
 411                         mprintf((0,"Opengl loaded ok\n"));
 412
 413                         if(!glEnd)
 414                         {
 415                                 Error("Opengl: Functions not imported\n");
 416                         }
 417                 }else{
 418                         Error("Opengl: error loading %s\n", OglLibPath? OglLibPath : SDL_GetError());
 419                 }
 420                 ogl_rt_loaded=1;
 421         }
 422         return retcode;
 423 }
 424 #endif
 425
 426 int gr_init()
 427 {
 428         int mode = SM(640,480);
 429         int retcode, t, glt = 0;
 430
 431         // Only do this function once!
 432         if (gr_installed==1)
 433                 return -1;
 434
 435
 436 #ifdef OGL_RUNTIME_LOAD
 437         ogl_init_load_library();
 438 #endif
 439
 440 #ifdef GR_SUPPORTS_FULLSCREEN_TOGGLE
 441         if (FindArg("-gl_voodoo")){
 442                 ogl_voodoohack=1;
 443                 gr_toggle_fullscreen();
 444         }
 445         if (FindArg("-fullscreen"))
 446                 gr_toggle_fullscreen();
 447 #endif
 448         if ((glt=FindArg("-gl_alttexmerge")))
 449                 ogl_alttexmerge=1;
 450         if ((t=FindArg("-gl_stdtexmerge")))
 451                 if (t>=glt)//allow overriding of earlier args
 452                         ogl_alttexmerge=0;
 453
 454         if ((glt = FindArg("-gl_16bittextures")))
 455         {
 456                 ogl_rgba_internalformat = GL_RGB5_A1;
 457                 ogl_rgb_internalformat = GL_RGB5;
 458         }
 459
 460         if ((glt=FindArg("-gl_mipmap"))){
 461                 GL_texmagfilt=GL_LINEAR;
 462                 GL_texminfilt=GL_LINEAR_MIPMAP_NEAREST;
 463         }
 464         if ((glt=FindArg("-gl_trilinear")))
 465         {
 466                 GL_texmagfilt = GL_LINEAR;
 467                 GL_texminfilt = GL_LINEAR_MIPMAP_LINEAR;
 468         }
 469         if ((t=FindArg("-gl_simple"))){
 470                 if (t>=glt){//allow overriding of earlier args
 471                         glt=t;
 472                         GL_texmagfilt=GL_NEAREST;
 473                         GL_texminfilt=GL_NEAREST;
 474                 }
 475         }
 476         if ((t=FindArg("-gl_texmagfilt")) || (t=FindArg("-gl_texmagfilter"))){
 477                 if (t>=glt)//allow overriding of earlier args
 478                         GL_texmagfilt=ogl_atotexfilti(Args[t+1],0);
 479         }
 480         if ((t=FindArg("-gl_texminfilt")) || (t=FindArg("-gl_texminfilter"))){
 481                 if (t>=glt)//allow overriding of earlier args
 482                         GL_texminfilt=ogl_atotexfilti(Args[t+1],1);
 483         }
 484         GL_needmipmaps=ogl_testneedmipmaps(GL_texminfilt);
 485
 486         if ((t = FindArg("-gl_anisotropy")) || (t = FindArg("-gl_anisotropic")))
 487         {
 488                 GL_texanisofilt=atof(Args[t + 1]);
 489         }
 490
 491         mprintf((0,"gr_init: texmagfilt:%x texminfilt:%x needmipmaps=%i anisotropic:%f\n",GL_texmagfilt,GL_texminfilt,GL_needmipmaps,GL_texanisofilt));
 492
 493
 494         if ((t=FindArg("-gl_vidmem"))){
 495                 ogl_mem_target=atoi(Args[t+1])*1024*1024;
 496         }
 497         if ((t=FindArg("-gl_reticle"))){
 498                 gl_reticle=atoi(Args[t+1]);
 499         }
 500         //printf("ogl_mem_target=%i\n",ogl_mem_target);
 501
 502         ogl_init();//platform specific initialization
 503
 504         ogl_init_texture_list_internal();
 505
 506         MALLOC( grd_curscreen,grs_screen,1 );
 507         memset( grd_curscreen, 0, sizeof(grs_screen));
 508         grd_curscreen->sc_canvas.cv_bitmap.bm_data = NULL;
 509
 510         // Set the mode.
 511         if ((retcode=gr_set_mode(mode)))
 512         {
 513                 return retcode;
 514         }
 515
 516         grd_curscreen->sc_canvas.cv_color = 0;
 517         grd_curscreen->sc_canvas.cv_drawmode = 0;
 518         grd_curscreen->sc_canvas.cv_font = NULL;
 519         grd_curscreen->sc_canvas.cv_font_fg_color = 0;
 520         grd_curscreen->sc_canvas.cv_font_bg_color = 0;
 521         gr_set_current_canvas( &grd_curscreen->sc_canvas );
 522
 523         gr_installed = 1;
 524
 525         atexit(gr_close);
 526
 527         return 0;
 528 }
 529
 530 void gr_close()
 531 {
 532 //      mprintf((0,"ogl init: %s %s %s - %s\n",glGetString(GL_VENDOR),glGetString(GL_RENDERER),glGetString(GL_VERSION),glGetString,(GL_EXTENSIONS)));
 533
 534         ogl_close();//platform specific code
 535         if (grd_curscreen){
 536                 if (grd_curscreen->sc_canvas.cv_bitmap.bm_data)
 537                         d_free(grd_curscreen->sc_canvas.cv_bitmap.bm_data);
 538                 d_free(grd_curscreen);
 539         }
 540 #ifdef OGL_RUNTIME_LOAD
 541         if (ogl_rt_loaded)
 542                 OpenGL_LoadLibrary(false);
 543 #endif
 544 }
 545 extern int r_upixelc;
 546 void ogl_upixelc(int x, int y, int c){
 547         r_upixelc++;
 548 //      printf("gr_upixelc(%i,%i,%i)%i\n",x,y,c,Function_mode==FMODE_GAME);
 549 //      if(Function_mode != FMODE_GAME){
 550 //              grd_curcanv->cv_bitmap.bm_data[y*grd_curscreen->sc_canvas.cv_bitmap.bm_w+x]=c;
 551 //      }else{
 552                 OGL_DISABLE(TEXTURE_2D);
 553                 glPointSize(1.0);
 554                 glBegin(GL_POINTS);
 555 //              glBegin(GL_LINES);
 556 //      ogl_pal=gr_current_pal;
 557                 glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 558 //      ogl_pal=gr_palette;
 559                 glVertex2f((x + grd_curcanv->cv_bitmap.bm_x + 0.5) / (float)last_width, 1.0 - (y + grd_curcanv->cv_bitmap.bm_y + 0.5) / (float)last_height);
 560 //              glVertex2f(x/((float)last_width+1),1.0-y/((float)last_height+1));
 561                 glEnd();
 562 //      }
 563 }
 564 void ogl_urect(int left,int top,int right,int bot){
 565         GLfloat xo,yo,xf,yf;
 566         int c=COLOR;
 567
 568         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 569         xf = (right + 1 + grd_curcanv->cv_bitmap.bm_x) / (float)last_width;
 570         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 571         yf = 1.0 - (bot + 1 + grd_curcanv->cv_bitmap.bm_y) / (float)last_height;
 572
 573         OGL_DISABLE(TEXTURE_2D);
 574         if (Gr_scanline_darkening_level >= GR_FADE_LEVELS)
 575                 glColor3f(CPAL2Tr(c), CPAL2Tg(c), CPAL2Tb(c));
 576         else
 577                 glColor4f(CPAL2Tr(c), CPAL2Tg(c), CPAL2Tb(c), 1.0 - (float)Gr_scanline_darkening_level / ((float)GR_FADE_LEVELS - 1.0));
 578         glBegin(GL_QUADS);
 579         glVertex2f(xo,yo);
 580         glVertex2f(xo,yf);
 581         glVertex2f(xf,yf);
 582         glVertex2f(xf,yo);
 583         glEnd();
 584 }
 585 void ogl_ulinec(int left,int top,int right,int bot,int c){
 586         GLfloat xo,yo,xf,yf;
 587
 588         xo = (left + grd_curcanv->cv_bitmap.bm_x + 0.5) / (float)last_width;
 589         xf = (right + grd_curcanv->cv_bitmap.bm_x + 0.5) / (float)last_width;
 590         yo = 1.0 - (top + grd_curcanv->cv_bitmap.bm_y + 0.5) / (float)last_height;
 591         yf = 1.0 - (bot + grd_curcanv->cv_bitmap.bm_y + 0.5) / (float)last_height;
 592
 593         OGL_DISABLE(TEXTURE_2D);
 594         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 595         glBegin(GL_LINES);
 596         glVertex2f(xo,yo);
 597         glVertex2f(xf,yf);
 598         glEnd();
 599 }
 600
 601
 602 GLfloat last_r=0, last_g=0, last_b=0;
 603 int do_pal_step=0;
 604 void ogl_do_palfx(void){
 605 //      GLfloat r,g,b,a;
 606         OGL_DISABLE(TEXTURE_2D);
 607         if (gr_palette_faded_out){
 608 /*              glEnable(GL_BLEND);
 609                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);*/
 610                 glColor3f(0,0,0);
 611 //              r=g=b=0.0;a=1.0;
 612         }else{
 613                 if (do_pal_step){
 614                         //glBlendFunc(GL_SRC_COLOR, GL_DST_COLOR);
 615                         glEnable(GL_BLEND);
 616                         glBlendFunc(GL_ONE,GL_ONE);
 617                         glColor3f(last_r,last_g,last_b);
 618 //                      r=f2fl(last_r);g=f2fl(last_g);b=f2fl(last_b);a=0.5;
 619                 }else
 620                         return;
 621         }
 622
 623
 624         glBegin(GL_QUADS);
 625         glVertex2f(0,0);
 626         glVertex2f(0,1);
 627         glVertex2f(1,1);
 628         glVertex2f(1,0);
 629         glEnd();
 630
 631         glEnable(GL_BLEND);
 632         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 633 }
 634
 635 void gr_palette_clear()
 636 {
 637         gr_palette_faded_out=1;
 638 }
 639
 640
 641 int ogl_brightness_ok = 0;
 642 int ogl_setgammaramp_ok = 1;
 643 int ogl_brightness_r = 0, ogl_brightness_g = 0, ogl_brightness_b = 0;
 644 static int old_b_r = 0, old_b_g = 0, old_b_b = 0;
 645
 646 void gr_palette_step_up(int r, int g, int b)
 647 {
 648         if (gr_palette_faded_out)
 649                 return;
 650
 651         old_b_r = ogl_brightness_r;
 652         old_b_g = ogl_brightness_g;
 653         old_b_b = ogl_brightness_b;
 654
 655         ogl_brightness_r = max(r + gr_palette_gamma, 0);
 656         ogl_brightness_g = max(g + gr_palette_gamma, 0);
 657         ogl_brightness_b = max(b + gr_palette_gamma, 0);
 658
 659         if (ogl_setgammaramp_ok &&
 660             (old_b_r != ogl_brightness_r ||
 661              old_b_g != ogl_brightness_g ||
 662              old_b_b != ogl_brightness_b))
 663                 ogl_brightness_ok = !ogl_setbrightness_internal();
 664
 665         if (!ogl_setgammaramp_ok || !ogl_brightness_ok)
 666         {
 667                 last_r = ogl_brightness_r / 63.0;
 668                 last_g = ogl_brightness_g / 63.0;
 669                 last_b = ogl_brightness_b / 63.0;
 670
 671                 do_pal_step = (r || g || b || gr_palette_gamma);
 672         }
 673         else
 674         {
 675                 do_pal_step = 0;
 676         }
 677 }
 678
 679 //added on 980913 by adb to fix palette problems
 680 // need a min without side effects...
 681 #undef min
 682 static inline int min(int x, int y) { return x < y ? x : y; }
 683 //end changes by adb
 684
 685 void gr_palette_load( ubyte *pal )
 686 {
 687  int i;//, j;
 688
 689  for (i=0; i<768; i++ ) {
 690      gr_current_pal[i] = pal[i];
 691      if (gr_current_pal[i] > 63) gr_current_pal[i] = 63;
 692  }
 693  //palette = screen->format->palette;
 694
 695  gr_palette_faded_out=0;
 696
 697         gr_palette_step_up(0, 0, 0); // make ogl_setbrightness_internal get run so that menus get brightened too.
 698
 699  init_computed_colors();
 700
 701         ogl_init_shared_palette();
 702 }
 703
 704
 705
 706 int gr_palette_fade_out(ubyte *pal, int nsteps, int allow_keys)
 707 {
 708         gr_palette_faded_out=1;
 709         return 0;
 710 }
 711
 712
 713
 714 int gr_palette_fade_in(ubyte *pal, int nsteps, int allow_keys)
 715 {
 716         gr_palette_faded_out=0;
 717         return 0;
 718 }
 719
 720
 721
 722 void gr_palette_read(ubyte * pal)
 723 {
 724         int i;
 725         for (i=0; i<768; i++ ) {
 726                 pal[i]=gr_current_pal[i];
 727                 if (pal[i] > 63) pal[i] = 63;
 728         }
 729 }
 730
 731 //writes out an uncompressed RGB .tga file
 732 //if we got really spiffy, we could optionally link in libpng or something, and use that.
 733 void write_bmp(char *savename,int w,int h,unsigned char *buf){
 734         PHYSFS_file *f;
 735
 736         f = cfopen(savename, "wb");
 737
 738         if (f>=0){
 739                 GLubyte    targaMagic[12] = { 0, //no identification field
 740                          0,//no colormap
 741                          2,//RGB image (well, BGR, actually)
 742                          0, 0, 0, 0, 0, 0, 0, 0, 0 };//no colormap or image origin stuff.
 743                 GLubyte blah;
 744                 int r;
 745                 GLubyte *s;
 746                 int x,y;
 747
 748                 //write .TGA header.
 749                 PHYSFS_write(f, targaMagic, sizeof(targaMagic), 1);
 750                 PHYSFS_writeSLE32(f, w);
 751                 PHYSFS_writeSLE32(f, h);
 752                 PHYSFSX_writeU8(f, 24); // 24 bpp
 753                 PHYSFSX_writeU8(f, 0);  // no attribute bits, origin is lowerleft, no interleave
 754
 755                 s=buf;
 756                 for (y=0;y<h;y++){//TGAs use BGR ordering of data.
 757                         for (x=0;x<w;x++){
 758                                 blah=s[0];
 759                                 s[0]=s[2];
 760                                 s[2]=blah;
 761                                 s+=3;
 762                         }
 763                 }
 764                 x=0;y=w*h*3;
 765                 while (y > 0)
 766                 {
 767                         r = PHYSFS_write(f, buf + x, 1, y);
 768                         if (r<=0){
 769                                 mprintf((0,"screenshot error, couldn't write to %s (err %i)\n",savename,errno));
 770                                 break;
 771                         }
 772                         x+=r;y-=r;
 773                 }
 774                 PHYSFS_close(f);
 775         }else{
 776                 mprintf((0,"screenshot error, couldn't open %s (err %i)\n",savename,errno));
 777         }
 778 }
 779 void save_screen_shot(int automap_flag)
 780 {
 781 //      fix t1;
 782         char message[100];
 783         static int savenum=0;
 784         char savename[13];
 785         unsigned char *buf;
 786
 787         if (!ogl_readpixels_ok){
 788                 if (!automap_flag)
 789                         hud_message(MSGC_GAME_FEEDBACK,"glReadPixels not supported on your configuration");
 790                 return;
 791         }
 792
 793         stop_time();
 794
 795 //added/changed on 10/31/98 by Victor Rachels to fix overwrite each new game
 796         if ( savenum == 9999 ) savenum = 0;
 797         sprintf(savename,"scrn%04d.tga",savenum++);
 798
 799         while(!access(savename,0))
 800         {
 801                 if ( savenum == 9999 ) savenum = 0;
 802                 sprintf(savename,"scrn%04d.tga",savenum++);
 803         }
 804         sprintf( message, "%s '%s'", TXT_DUMPING_SCREEN, savename );
 805 //end this section addition/change - Victor Rachels
 806
 807         if (automap_flag) {
 808 //      save_font = grd_curcanv->cv_font;
 809 //      gr_set_curfont(GAME_FONT);
 810 //      gr_set_fontcolor(gr_find_closest_color_current(0,31,0),-1);
 811 //      gr_get_string_size(message,&w,&h,&aw);
 812 //              modex_print_message(32, 2, message);
 813         } else {
 814                 hud_message(MSGC_GAME_FEEDBACK,message);
 815         }
 816
 817         buf = d_malloc(grd_curscreen->sc_w*grd_curscreen->sc_h*3);
 818         glReadBuffer(GL_FRONT);
 819         glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 820         write_bmp(savename,grd_curscreen->sc_w,grd_curscreen->sc_h,buf);
 821         d_free(buf);
 822
 823         key_flush();
 824         start_time();
 825 }