arch/ogl/gr.c

   1 /* $Id: gr.c,v 1.15 2003-11-27 00:21:04 btb 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(__APPLE__) && defined(__MACH__)
  21 //#include <OpenGL/gl.h>
  22 #else
  23 //#include <GL/gl.h>
  24 #endif
  25 #ifndef _MSC_VER
  26 #include <unistd.h>
  27 #endif
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32
  33 #include "hudmsg.h"
  34 #include "game.h"
  35 #include "text.h"
  36 #include "gr.h"
  37 #include "gamefont.h"
  38 #include "grdef.h"
  39 #include "palette.h"
  40 #include "u_mem.h"
  41 #include "error.h"
  42
  43 #include "inferno.h"
  44 #include "screens.h"
  45
  46 #include "strutil.h"
  47 #include "mono.h"
  48 #include "args.h"
  49 #include "key.h"
  50
  51 #define DECLARE_VARS
  52 #include "ogl_init.h"
  53 #if defined(__APPLE__) && defined(__MACH__)
  54 #include <OpenGL/glu.h>
  55 #undef GL_ARB_multitexture // hack!
  56 #else
  57 #include <GL/glu.h>
  58 #endif
  59
  60 int ogl_voodoohack=0;
  61
  62 int gr_installed = 0;
  63
  64
  65 void gr_palette_clear(); // Function prototype for gr_init;
  66 int gl_initialized=0;
  67 int gl_reticle = 0;
  68
  69 int ogl_fullscreen=0;
  70
  71 int gr_check_fullscreen(void){
  72         return ogl_fullscreen;
  73 }
  74
  75 void gr_do_fullscreen(int f){
  76         if (ogl_voodoohack)
  77                 ogl_fullscreen=1;//force fullscreen mode on voodoos.
  78         else
  79                 ogl_fullscreen=f;
  80         if (gl_initialized){
  81                 ogl_do_fullscreen_internal();
  82         }
  83 }
  84
  85 int gr_toggle_fullscreen(void){
  86         gr_do_fullscreen(!ogl_fullscreen);
  87         //      grd_curscreen->sc_mode=0;//hack to get it to reset screen mode
  88         return ogl_fullscreen;
  89 }
  90
  91 int arch_toggle_fullscreen_menu(void){
  92         unsigned char *buf=NULL;
  93
  94         if (ogl_readpixels_ok){
  95                 MALLOC(buf,unsigned char,grd_curscreen->sc_w*grd_curscreen->sc_h*3);
  96                 glReadBuffer(GL_FRONT);
  97                 glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
  98         }
  99
 100         gr_do_fullscreen(!ogl_fullscreen);
 101
 102         if (ogl_readpixels_ok){
 103 //              glWritePixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 104                 glRasterPos2f(0,0);
 105                 glDrawPixels(grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 106                 free(buf);
 107         }
 108         //      grd_curscreen->sc_mode=0;//hack to get it to reset screen mode
 109
 110         return ogl_fullscreen;
 111 }
 112
 113 void ogl_init_state(void){
 114         /* select clearing (background) color   */
 115         glClearColor(0.0, 0.0, 0.0, 0.0);
 116         glShadeModel(GL_SMOOTH);
 117
 118         /* initialize viewing values */
 119         glMatrixMode(GL_PROJECTION);
 120         glLoadIdentity();
 121         glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 122         glScalef(1.0, -1.0, 1.0);
 123         glTranslatef(0.0, -1.0, 0.0);
 124         gr_palette_step_up(0,0,0);//in case its left over from in game
 125 }
 126
 127 int last_screen_mode=-1;
 128
 129 void ogl_set_screen_mode(void){
 130         if (last_screen_mode==Screen_mode)
 131                 return;
 132         OGL_VIEWPORT(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h);
 133 //      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);
 134         if (Screen_mode==SCREEN_GAME){
 135                 glDrawBuffer(GL_BACK);
 136         }else{
 137                 glClearColor(0.0, 0.0, 0.0, 0.0);
 138                 glDrawBuffer(GL_FRONT);
 139                 glClear(GL_COLOR_BUFFER_BIT);
 140                 glMatrixMode(GL_PROJECTION);
 141                 glLoadIdentity();//clear matrix
 142                 glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 143                 glMatrixMode(GL_MODELVIEW);
 144                 glLoadIdentity();//clear matrix
 145                 glEnable(GL_BLEND);
 146                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 147         }
 148         last_screen_mode=Screen_mode;
 149 }
 150
 151 void gr_update()
 152 {
 153         if (gl_initialized){
 154
 155                 if(Screen_mode != SCREEN_GAME){
 156                         glFlush();
 157                 }
 158         }
 159 }
 160
 161 const char *gl_vendor,*gl_renderer,*gl_version,*gl_extensions;
 162
 163 void ogl_get_verinfo(void){
 164         int t;
 165         gl_vendor=glGetString(GL_VENDOR);
 166         gl_renderer=glGetString(GL_RENDERER);
 167         gl_version=glGetString(GL_VERSION);
 168         gl_extensions=glGetString(GL_EXTENSIONS);
 169
 170         con_printf(CON_VERBOSE, "gl vendor:%s renderer:%s version:%s extensions:%s\n",gl_vendor,gl_renderer,gl_version,gl_extensions);
 171
 172         ogl_intensity4_ok=1;ogl_luminance4_alpha4_ok=1;ogl_rgba2_ok=1;ogl_gettexlevelparam_ok=1;
 173
 174 #if 0 //WGL only, I think
 175         dglMultiTexCoord2fARB = (glMultiTexCoord2fARB_fp)wglGetProcAddress("glMultiTexCoord2fARB");
 176         dglActiveTextureARB = (glActiveTextureARB_fp)wglGetProcAddress("glActiveTextureARB");
 177         dglMultiTexCoord2fSGIS = (glMultiTexCoord2fSGIS_fp)wglGetProcAddress("glMultiTexCoord2fSGIS");
 178         dglSelectTextureSGIS = (glSelectTextureSGIS_fp)wglGetProcAddress("glSelectTextureSGIS");
 179 #endif
 180
 181         //multitexturing doesn't work yet.
 182 #ifdef GL_ARB_multitexture
 183         ogl_arb_multitexture_ok=0;//(strstr(gl_extensions,"GL_ARB_multitexture")!=0 && glActiveTextureARB!=0 && 0);
 184         mprintf((0,"c:%p d:%p e:%p\n",strstr(gl_extensions,"GL_ARB_multitexture"),glActiveTextureARB,glBegin));
 185 #endif
 186 #ifdef GL_SGIS_multitexture
 187         ogl_sgis_multitexture_ok=0;//(strstr(gl_extensions,"GL_SGIS_multitexture")!=0 && glSelectTextureSGIS!=0 && 0);
 188         mprintf((0,"a:%p b:%p\n",strstr(gl_extensions,"GL_SGIS_multitexture"),glSelectTextureSGIS));
 189 #endif
 190
 191         //add driver specific hacks here.  whee.
 192         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){
 193                 ogl_intensity4_ok=0;//ignores alpha, always black background instead of transparent.
 194                 ogl_readpixels_ok=0;//either just returns all black, or kills the X server entirely
 195                 ogl_gettexlevelparam_ok=0;//returns random data..
 196         }
 197         if (stricmp(gl_vendor,"Matrox Graphics Inc.")==0){
 198                 //displays garbage. reported by
 199                 //  redomen@crcwnet.com (render="Matrox G400" version="1.1.3 5.52.015")
 200                 //  orulz (Matrox G200)
 201                 ogl_intensity4_ok=0;
 202         }
 203
 204         //allow overriding of stuff.
 205 #ifdef GL_ARB_multitexture
 206         if ((t=FindArg("-gl_arb_multitexture_ok"))){
 207                 ogl_arb_multitexture_ok=atoi(Args[t+1]);
 208         }
 209 #endif
 210 #ifdef GL_SGIS_multitexture
 211         if ((t=FindArg("-gl_sgis_multitexture_ok"))){
 212                 ogl_sgis_multitexture_ok=atoi(Args[t+1]);
 213         }
 214 #endif
 215         if ((t=FindArg("-gl_intensity4_ok"))){
 216                 ogl_intensity4_ok=atoi(Args[t+1]);
 217         }
 218         if ((t=FindArg("-gl_luminance4_alpha4_ok"))){
 219                 ogl_luminance4_alpha4_ok=atoi(Args[t+1]);
 220         }
 221         if ((t=FindArg("-gl_rgba2_ok"))){
 222                 ogl_rgba2_ok=atoi(Args[t+1]);
 223         }
 224         if ((t=FindArg("-gl_readpixels_ok"))){
 225                 ogl_readpixels_ok=atoi(Args[t+1]);
 226         }
 227         if ((t=FindArg("-gl_gettexlevelparam_ok"))){
 228                 ogl_gettexlevelparam_ok=atoi(Args[t+1]);
 229         }
 230
 231         con_printf(CON_VERBOSE, "gl_arb_multitexture:%i gl_sgis_multitexture:%i\n",ogl_arb_multitexture_ok,ogl_sgis_multitexture_ok);
 232         con_printf(CON_VERBOSE, "gl_intensity4:%i gl_luminance4_alpha4:%i gl_rgba2:%i gl_readpixels:%i gl_gettexlevelparam:%i\n",ogl_intensity4_ok,ogl_luminance4_alpha4_ok,ogl_rgba2_ok,ogl_readpixels_ok,ogl_gettexlevelparam_ok);
 233 }
 234
 235 extern int VGA_current_mode; // DPH: kludge - remove at all costs
 236
 237 int gr_set_mode(u_int32_t mode)
 238 {
 239         unsigned int w,h;
 240         char *gr_bm_data;
 241
 242 #ifdef NOGRAPH
 243 return 0;
 244 #endif
 245 //      mode=0;
 246         if (mode<=0)
 247                 return 0;
 248
 249         w=SM_W(mode);
 250         h=SM_H(mode);
 251         VGA_current_mode = mode;
 252
 253         //if (screen != NULL) gr_palette_clear();
 254
 255 //      ogl_init_state();
 256
 257         gr_bm_data=grd_curscreen->sc_canvas.cv_bitmap.bm_data;//since we use realloc, we want to keep this pointer around.
 258         memset( grd_curscreen, 0, sizeof(grs_screen));
 259         grd_curscreen->sc_mode = mode;
 260         grd_curscreen->sc_w = w;
 261         grd_curscreen->sc_h = h;
 262         grd_curscreen->sc_aspect = fixdiv(grd_curscreen->sc_w*3,grd_curscreen->sc_h*4);
 263         grd_curscreen->sc_canvas.cv_bitmap.bm_x = 0;
 264         grd_curscreen->sc_canvas.cv_bitmap.bm_y = 0;
 265         grd_curscreen->sc_canvas.cv_bitmap.bm_w = w;
 266         grd_curscreen->sc_canvas.cv_bitmap.bm_h = h;
 267         //grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = screen->pitch;
 268         grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = w;
 269         grd_curscreen->sc_canvas.cv_bitmap.bm_type = BM_OGL;
 270         //grd_curscreen->sc_canvas.cv_bitmap.bm_data = (unsigned char *)screen->pixels;
 271 //      mprintf((0,"ogl/gr.c: reallocing %p to %i\n",grd_curscreen->sc_canvas.cv_bitmap.bm_data,w*h));
 272         grd_curscreen->sc_canvas.cv_bitmap.bm_data = d_realloc(gr_bm_data,w*h);
 273         gr_set_current_canvas(NULL);
 274         //gr_enable_default_palette_loading();
 275
 276         ogl_init_window(w,h);//platform specific code
 277
 278         ogl_get_verinfo();
 279
 280         OGL_VIEWPORT(0,0,w,h);
 281
 282         ogl_set_screen_mode();
 283
 284 //      gamefont_choose_game_font(w,h);
 285
 286         return 0;
 287 }
 288
 289 #define GLstrcmptestr(a,b) if (stricmp(a,#b)==0 || stricmp(a,"GL_" #b)==0)return GL_ ## b;
 290 int ogl_atotexfilti(char *a,int min){
 291         GLstrcmptestr(a,NEAREST);
 292         GLstrcmptestr(a,LINEAR);
 293         if (min){//mipmaps are valid only for the min filter
 294                 GLstrcmptestr(a,NEAREST_MIPMAP_NEAREST);
 295                 GLstrcmptestr(a,NEAREST_MIPMAP_LINEAR);
 296                 GLstrcmptestr(a,LINEAR_MIPMAP_NEAREST);
 297                 GLstrcmptestr(a,LINEAR_MIPMAP_LINEAR);
 298         }
 299         Error("unknown/invalid texture filter %s\n",a);
 300 //      return GL_NEAREST;
 301 }
 302 int ogl_testneedmipmaps(int i){
 303         switch (i){
 304                 case GL_NEAREST:
 305                 case GL_LINEAR:
 306                         return 0;
 307                 case GL_NEAREST_MIPMAP_NEAREST:
 308                 case GL_NEAREST_MIPMAP_LINEAR:
 309                 case GL_LINEAR_MIPMAP_NEAREST:
 310                 case GL_LINEAR_MIPMAP_LINEAR:
 311                         return 1;
 312         }
 313         Error("unknown texture filter %x\n",i);
 314 //      return -1;
 315 }
 316 #ifdef OGL_RUNTIME_LOAD
 317 #ifdef _WIN32
 318 char *OglLibPath="opengl32.dll";
 319 #endif
 320 #ifdef __unix__
 321 char *OglLibPath="libGL.so";
 322 #endif
 323
 324 int ogl_rt_loaded=0;
 325 int ogl_init_load_library(void)
 326 {
 327         int retcode=0;
 328         if (!ogl_rt_loaded){
 329                 int t;
 330                 if ((t=FindArg("-gl_library")))
 331                         OglLibPath=Args[t+1];
 332
 333                 retcode = OpenGL_LoadLibrary(true);
 334                 if(retcode)
 335                 {
 336                         mprintf((0,"Opengl loaded ok\n"));
 337
 338                         if(!glEnd)
 339                         {
 340                                 Error("Opengl: Functions not imported\n");
 341                         }
 342                 }else{
 343                         Error("Opengl: error loading %s\n",OglLibPath);
 344                 }
 345                 ogl_rt_loaded=1;
 346         }
 347         return retcode;
 348 }
 349 #endif
 350
 351 int gr_init()
 352 {
 353         int mode = SM(640,480);
 354         int retcode, t, glt = 0;
 355
 356         // Only do this function once!
 357         if (gr_installed==1)
 358                 return -1;
 359
 360
 361 #ifdef OGL_RUNTIME_LOAD
 362         ogl_init_load_library();
 363 #endif
 364
 365 #ifdef GR_SUPPORTS_FULLSCREEN_TOGGLE
 366         if (FindArg("-gl_voodoo")){
 367                 ogl_voodoohack=1;
 368                 gr_toggle_fullscreen();
 369         }
 370         if (FindArg("-fullscreen"))
 371                 gr_toggle_fullscreen();
 372 #endif
 373         if ((glt=FindArg("-gl_alttexmerge")))
 374                 ogl_alttexmerge=1;
 375         if ((t=FindArg("-gl_stdtexmerge")))
 376                 if (t>=glt)//allow overriding of earlier args
 377                         ogl_alttexmerge=0;
 378
 379         if ((glt=FindArg("-gl_16bittextures")))
 380                 ogl_rgba_format=GL_RGB5_A1;
 381
 382         if ((glt=FindArg("-gl_mipmap"))){
 383                 GL_texmagfilt=GL_LINEAR;
 384                 GL_texminfilt=GL_LINEAR_MIPMAP_NEAREST;
 385         }
 386         if ((t=FindArg("-gl_simple"))){
 387                 if (t>=glt){//allow overriding of earlier args
 388                         glt=t;
 389                         GL_texmagfilt=GL_NEAREST;
 390                         GL_texminfilt=GL_NEAREST;
 391                 }
 392         }
 393         if ((t=FindArg("-gl_texmagfilt")) || (t=FindArg("-gl_texmagfilter"))){
 394                 if (t>=glt)//allow overriding of earlier args
 395                         GL_texmagfilt=ogl_atotexfilti(Args[t+1],0);
 396         }
 397         if ((t=FindArg("-gl_texminfilt")) || (t=FindArg("-gl_texminfilter"))){
 398                 if (t>=glt)//allow overriding of earlier args
 399                         GL_texminfilt=ogl_atotexfilti(Args[t+1],1);
 400         }
 401         GL_needmipmaps=ogl_testneedmipmaps(GL_texminfilt);
 402         mprintf((0,"gr_init: texmagfilt:%x texminfilt:%x needmipmaps=%i\n",GL_texmagfilt,GL_texminfilt,GL_needmipmaps));
 403
 404         if ((t=FindArg("-gl_vidmem"))){
 405                 ogl_mem_target=atoi(Args[t+1])*1024*1024;
 406         }
 407         if ((t=FindArg("-gl_reticle"))){
 408                 gl_reticle=atoi(Args[t+1]);
 409         }
 410         //printf("ogl_mem_target=%i\n",ogl_mem_target);
 411
 412         ogl_init();//platform specific initialization
 413
 414         ogl_init_texture_list_internal();
 415
 416         MALLOC( grd_curscreen,grs_screen,1 );
 417         memset( grd_curscreen, 0, sizeof(grs_screen));
 418         grd_curscreen->sc_canvas.cv_bitmap.bm_data = NULL;
 419
 420         // Set the mode.
 421         if ((retcode=gr_set_mode(mode)))
 422         {
 423                 return retcode;
 424         }
 425
 426         grd_curscreen->sc_canvas.cv_color = 0;
 427         grd_curscreen->sc_canvas.cv_drawmode = 0;
 428         grd_curscreen->sc_canvas.cv_font = NULL;
 429         grd_curscreen->sc_canvas.cv_font_fg_color = 0;
 430         grd_curscreen->sc_canvas.cv_font_bg_color = 0;
 431         gr_set_current_canvas( &grd_curscreen->sc_canvas );
 432
 433         gr_installed = 1;
 434
 435         atexit(gr_close);
 436
 437         return 0;
 438 }
 439
 440 void gr_close()
 441 {
 442 //      mprintf((0,"ogl init: %s %s %s - %s\n",glGetString(GL_VENDOR),glGetString(GL_RENDERER),glGetString(GL_VERSION),glGetString,(GL_EXTENSIONS)));
 443
 444         ogl_close();//platform specific code
 445         if (grd_curscreen){
 446                 if (grd_curscreen->sc_canvas.cv_bitmap.bm_data)
 447                         d_free(grd_curscreen->sc_canvas.cv_bitmap.bm_data);
 448                 d_free(grd_curscreen);
 449         }
 450 #ifdef OGL_RUNTIME_LOAD
 451         if (ogl_rt_loaded)
 452                 OpenGL_LoadLibrary(false);
 453 #endif
 454 }
 455 extern int r_upixelc;
 456 void ogl_upixelc(int x, int y, int c){
 457         r_upixelc++;
 458 //      printf("gr_upixelc(%i,%i,%i)%i\n",x,y,c,Function_mode==FMODE_GAME);
 459 //      if(Function_mode != FMODE_GAME){
 460 //              grd_curcanv->cv_bitmap.bm_data[y*grd_curscreen->sc_canvas.cv_bitmap.bm_w+x]=c;
 461 //      }else{
 462                 OGL_DISABLE(TEXTURE_2D);
 463                 glPointSize(1.0);
 464                 glBegin(GL_POINTS);
 465 //              glBegin(GL_LINES);
 466 //      ogl_pal=gr_current_pal;
 467                 glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 468 //      ogl_pal=gr_palette;
 469                 glVertex2f((x+grd_curcanv->cv_bitmap.bm_x)/(float)last_width,1.0-(y+grd_curcanv->cv_bitmap.bm_y)/(float)last_height);
 470 //              glVertex2f(x/((float)last_width+1),1.0-y/((float)last_height+1));
 471                 glEnd();
 472 //      }
 473 }
 474 void ogl_urect(int left,int top,int right,int bot){
 475         GLfloat xo,yo,xf,yf;
 476         int c=COLOR;
 477
 478         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 479         xf=(right+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 480         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 481         yf=1.0-(bot+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 482
 483         OGL_DISABLE(TEXTURE_2D);
 484         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 485         glBegin(GL_QUADS);
 486         glVertex2f(xo,yo);
 487         glVertex2f(xo,yf);
 488         glVertex2f(xf,yf);
 489         glVertex2f(xf,yo);
 490         glEnd();
 491 }
 492 void ogl_ulinec(int left,int top,int right,int bot,int c){
 493         GLfloat xo,yo,xf,yf;
 494
 495         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 496         xf=(right+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 497         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 498         yf=1.0-(bot+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 499
 500         OGL_DISABLE(TEXTURE_2D);
 501         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 502         glBegin(GL_LINES);
 503         glVertex2f(xo,yo);
 504         glVertex2f(xf,yf);
 505         glEnd();
 506 }
 507
 508
 509 GLfloat last_r=0, last_g=0, last_b=0;
 510 int do_pal_step=0;
 511 void ogl_do_palfx(void){
 512 //      GLfloat r,g,b,a;
 513         OGL_DISABLE(TEXTURE_2D);
 514         if (gr_palette_faded_out){
 515 /*              glEnable(GL_BLEND);
 516                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);*/
 517                 glColor3f(0,0,0);
 518 //              r=g=b=0.0;a=1.0;
 519         }else{
 520                 if (do_pal_step){
 521                         //glBlendFunc(GL_SRC_COLOR, GL_DST_COLOR);
 522                         glEnable(GL_BLEND);
 523                         glBlendFunc(GL_ONE,GL_ONE);
 524                         glColor3f(last_r,last_g,last_b);
 525 //                      r=f2fl(last_r);g=f2fl(last_g);b=f2fl(last_b);a=0.5;
 526                 }else
 527                         return;
 528         }
 529
 530
 531         glBegin(GL_QUADS);
 532         glVertex2f(0,0);
 533         glVertex2f(0,1);
 534         glVertex2f(1,1);
 535         glVertex2f(1,0);
 536         glEnd();
 537
 538         glEnable(GL_BLEND);
 539         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 540 }
 541
 542 void gr_palette_clear()
 543 {
 544         gr_palette_faded_out=1;
 545 }
 546
 547
 548 void gr_palette_step_up( int r, int g, int b )
 549 {
 550         if (gr_palette_faded_out) return;
 551
 552 //      if ( (r==last_r) && (g==last_g) && (b==last_b) ) return;
 553
 554 /*      last_r = r/63.0;
 555         last_g = g/63.0;
 556         last_b = b/63.0;
 557         do_pal_step=(r || g || b);*/
 558
 559         last_r = (r+gr_palette_gamma)/63.0;
 560         last_g = (g+gr_palette_gamma)/63.0;
 561         last_b = (b+gr_palette_gamma)/63.0;
 562
 563         do_pal_step=(r || g || b || gr_palette_gamma);
 564
 565 }
 566
 567 //added on 980913 by adb to fix palette problems
 568 // need a min without side effects...
 569 #undef min
 570 static inline int min(int x, int y) { return x < y ? x : y; }
 571 //end changes by adb
 572
 573 void gr_palette_load( ubyte *pal )
 574 {
 575  int i;//, j;
 576
 577  for (i=0; i<768; i++ ) {
 578      gr_current_pal[i] = pal[i];
 579      if (gr_current_pal[i] > 63) gr_current_pal[i] = 63;
 580  }
 581  //palette = screen->format->palette;
 582
 583  gr_palette_faded_out=0;
 584
 585  init_computed_colors();
 586 }
 587
 588
 589
 590 int gr_palette_fade_out(ubyte *pal, int nsteps, int allow_keys)
 591 {
 592         gr_palette_faded_out=1;
 593         return 0;
 594 }
 595
 596
 597
 598 int gr_palette_fade_in(ubyte *pal, int nsteps, int allow_keys)
 599 {
 600         gr_palette_faded_out=0;
 601         return 0;
 602 }
 603
 604
 605
 606 void gr_palette_read(ubyte * pal)
 607 {
 608         int i;
 609         for (i=0; i<768; i++ ) {
 610                 pal[i]=gr_current_pal[i];
 611                 if (pal[i] > 63) pal[i] = 63;
 612         }
 613 }
 614
 615 //writes out an uncompressed RGB .tga file
 616 //if we got really spiffy, we could optionally link in libpng or something, and use that.
 617 void write_bmp(char *savename,int w,int h,unsigned char *buf){
 618         int f;
 619 #ifdef _WIN32
 620         f=open(savename,O_CREAT|O_EXCL|O_WRONLY,S_IREAD|S_IWRITE);
 621 #else
 622         f=open(savename,O_CREAT|O_EXCL|O_WRONLY,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 623 #endif
 624         if (f>=0){
 625                 GLubyte    targaMagic[12] = { 0, //no identification field
 626                          0,//no colormap
 627                          2,//RGB image (well, BGR, actually)
 628                          0, 0, 0, 0, 0, 0, 0, 0, 0 };//no colormap or image origin stuff.
 629                 GLubyte blah;
 630                 int r;
 631                 GLubyte *s;
 632                 int x,y;
 633
 634                 //write .TGA header.
 635                 write (f,targaMagic,sizeof(targaMagic));
 636                 blah=w%256;write (f,&blah,1);//w, low
 637                 blah=w/256;write (f,&blah,1);//w, high
 638                 blah=h%256;write (f,&blah,1);//h, low
 639                 blah=h/256;write (f,&blah,1);//h, high
 640                 blah=24;write (f,&blah,1);//24 bpp
 641                 blah=0;write (f,&blah,1);//no attribute bits, origin is lowerleft, no interleave
 642
 643                 s=buf;
 644                 for (y=0;y<h;y++){//TGAs use BGR ordering of data.
 645                         for (x=0;x<w;x++){
 646                                 blah=s[0];
 647                                 s[0]=s[2];
 648                                 s[2]=blah;
 649                                 s+=3;
 650                         }
 651                 }
 652                 x=0;y=w*h*3;
 653                 while (x<y){
 654                         r=write(f,buf+x,y);
 655                         if (r<=0){
 656                                 mprintf((0,"screenshot error, couldn't write to %s (err %i)\n",savename,errno));
 657                                 break;
 658                         }
 659                         x+=r;y-=r;
 660                 }
 661                 close(f);
 662         }else{
 663                 mprintf((0,"screenshot error, couldn't open %s (err %i)\n",savename,errno));
 664         }
 665 }
 666 void save_screen_shot(int automap_flag)
 667 {
 668 //      fix t1;
 669         char message[100];
 670         static int savenum=0;
 671         char savename[13];
 672         unsigned char *buf;
 673
 674         if (!ogl_readpixels_ok){
 675                 if (!automap_flag)
 676                         hud_message(MSGC_GAME_FEEDBACK,"glReadPixels not supported on your configuration");
 677                 return;
 678         }
 679
 680         stop_time();
 681
 682 //added/changed on 10/31/98 by Victor Rachels to fix overwrite each new game
 683         if ( savenum == 9999 ) savenum = 0;
 684         sprintf(savename,"scrn%04d.tga",savenum++);
 685
 686         while(!access(savename,0))
 687         {
 688                 if ( savenum == 9999 ) savenum = 0;
 689                 sprintf(savename,"scrn%04d.tga",savenum++);
 690         }
 691         sprintf( message, "%s '%s'", TXT_DUMPING_SCREEN, savename );
 692 //end this section addition/change - Victor Rachels
 693
 694         if (automap_flag) {
 695 //      save_font = grd_curcanv->cv_font;
 696 //      gr_set_curfont(GAME_FONT);
 697 //      gr_set_fontcolor(gr_find_closest_color_current(0,31,0),-1);
 698 //      gr_get_string_size(message,&w,&h,&aw);
 699 //              modex_print_message(32, 2, message);
 700         } else {
 701                 hud_message(MSGC_GAME_FEEDBACK,message);
 702         }
 703
 704         buf = d_malloc(grd_curscreen->sc_w*grd_curscreen->sc_h*3);
 705         glReadBuffer(GL_FRONT);
 706         glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 707         write_bmp(savename,grd_curscreen->sc_w,grd_curscreen->sc_h,buf);
 708         d_free(buf);
 709
 710         key_flush();
 711         start_time();
 712 }