arch/ogl/gr.c

   1 /* $Id: gr.c,v 1.18 2004-05-19 03:35:48 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 "internal.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
 236 int gr_check_mode(u_int32_t mode)
 237 {
 238         int w, h;
 239
 240         w = SM_W(mode);
 241         h = SM_H(mode);
 242         return ogl_check_mode(w, h); // platform specific code
 243 }
 244
 245
 246 extern int VGA_current_mode; // DPH: kludge - remove at all costs
 247
 248 int gr_set_mode(u_int32_t mode)
 249 {
 250         unsigned int w,h;
 251         char *gr_bm_data;
 252
 253 #ifdef NOGRAPH
 254 return 0;
 255 #endif
 256 //      mode=0;
 257         if (mode<=0)
 258                 return 0;
 259
 260         w=SM_W(mode);
 261         h=SM_H(mode);
 262         VGA_current_mode = mode;
 263
 264         //if (screen != NULL) gr_palette_clear();
 265
 266 //      ogl_init_state();
 267
 268         gr_bm_data=grd_curscreen->sc_canvas.cv_bitmap.bm_data;//since we use realloc, we want to keep this pointer around.
 269         memset( grd_curscreen, 0, sizeof(grs_screen));
 270         grd_curscreen->sc_mode = mode;
 271         grd_curscreen->sc_w = w;
 272         grd_curscreen->sc_h = h;
 273         grd_curscreen->sc_aspect = fixdiv(grd_curscreen->sc_w*3,grd_curscreen->sc_h*4);
 274         grd_curscreen->sc_canvas.cv_bitmap.bm_x = 0;
 275         grd_curscreen->sc_canvas.cv_bitmap.bm_y = 0;
 276         grd_curscreen->sc_canvas.cv_bitmap.bm_w = w;
 277         grd_curscreen->sc_canvas.cv_bitmap.bm_h = h;
 278         //grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = screen->pitch;
 279         grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = w;
 280         grd_curscreen->sc_canvas.cv_bitmap.bm_type = BM_OGL;
 281         //grd_curscreen->sc_canvas.cv_bitmap.bm_data = (unsigned char *)screen->pixels;
 282 //      mprintf((0,"ogl/gr.c: reallocing %p to %i\n",grd_curscreen->sc_canvas.cv_bitmap.bm_data,w*h));
 283         grd_curscreen->sc_canvas.cv_bitmap.bm_data = d_realloc(gr_bm_data,w*h);
 284         gr_set_current_canvas(NULL);
 285         //gr_enable_default_palette_loading();
 286
 287         ogl_init_window(w,h);//platform specific code
 288
 289         ogl_get_verinfo();
 290
 291         OGL_VIEWPORT(0,0,w,h);
 292
 293         ogl_set_screen_mode();
 294
 295 //      gamefont_choose_game_font(w,h);
 296
 297         return 0;
 298 }
 299
 300 #define GLstrcmptestr(a,b) if (stricmp(a,#b)==0 || stricmp(a,"GL_" #b)==0)return GL_ ## b;
 301 int ogl_atotexfilti(char *a,int min){
 302         GLstrcmptestr(a,NEAREST);
 303         GLstrcmptestr(a,LINEAR);
 304         if (min){//mipmaps are valid only for the min filter
 305                 GLstrcmptestr(a,NEAREST_MIPMAP_NEAREST);
 306                 GLstrcmptestr(a,NEAREST_MIPMAP_LINEAR);
 307                 GLstrcmptestr(a,LINEAR_MIPMAP_NEAREST);
 308                 GLstrcmptestr(a,LINEAR_MIPMAP_LINEAR);
 309         }
 310         Error("unknown/invalid texture filter %s\n",a);
 311 //      return GL_NEAREST;
 312 }
 313 int ogl_testneedmipmaps(int i){
 314         switch (i){
 315                 case GL_NEAREST:
 316                 case GL_LINEAR:
 317                         return 0;
 318                 case GL_NEAREST_MIPMAP_NEAREST:
 319                 case GL_NEAREST_MIPMAP_LINEAR:
 320                 case GL_LINEAR_MIPMAP_NEAREST:
 321                 case GL_LINEAR_MIPMAP_LINEAR:
 322                         return 1;
 323         }
 324         Error("unknown texture filter %x\n",i);
 325 //      return -1;
 326 }
 327 #ifdef OGL_RUNTIME_LOAD
 328 #ifdef _WIN32
 329 char *OglLibPath="opengl32.dll";
 330 #endif
 331 #ifdef __unix__
 332 char *OglLibPath="libGL.so";
 333 #endif
 334
 335 int ogl_rt_loaded=0;
 336 int ogl_init_load_library(void)
 337 {
 338         int retcode=0;
 339         if (!ogl_rt_loaded){
 340                 int t;
 341                 if ((t=FindArg("-gl_library")))
 342                         OglLibPath=Args[t+1];
 343
 344                 retcode = OpenGL_LoadLibrary(true);
 345                 if(retcode)
 346                 {
 347                         mprintf((0,"Opengl loaded ok\n"));
 348
 349                         if(!glEnd)
 350                         {
 351                                 Error("Opengl: Functions not imported\n");
 352                         }
 353                 }else{
 354                         Error("Opengl: error loading %s\n",OglLibPath);
 355                 }
 356                 ogl_rt_loaded=1;
 357         }
 358         return retcode;
 359 }
 360 #endif
 361
 362 int gr_init()
 363 {
 364         int mode = SM(640,480);
 365         int retcode, t, glt = 0;
 366
 367         // Only do this function once!
 368         if (gr_installed==1)
 369                 return -1;
 370
 371
 372 #ifdef OGL_RUNTIME_LOAD
 373         ogl_init_load_library();
 374 #endif
 375
 376 #ifdef GR_SUPPORTS_FULLSCREEN_TOGGLE
 377         if (FindArg("-gl_voodoo")){
 378                 ogl_voodoohack=1;
 379                 gr_toggle_fullscreen();
 380         }
 381         if (FindArg("-fullscreen"))
 382                 gr_toggle_fullscreen();
 383 #endif
 384         if ((glt=FindArg("-gl_alttexmerge")))
 385                 ogl_alttexmerge=1;
 386         if ((t=FindArg("-gl_stdtexmerge")))
 387                 if (t>=glt)//allow overriding of earlier args
 388                         ogl_alttexmerge=0;
 389
 390         if ((glt=FindArg("-gl_16bittextures")))
 391                 ogl_rgba_format=GL_RGB5_A1;
 392
 393         if ((glt=FindArg("-gl_mipmap"))){
 394                 GL_texmagfilt=GL_LINEAR;
 395                 GL_texminfilt=GL_LINEAR_MIPMAP_NEAREST;
 396         }
 397         if ((t=FindArg("-gl_simple"))){
 398                 if (t>=glt){//allow overriding of earlier args
 399                         glt=t;
 400                         GL_texmagfilt=GL_NEAREST;
 401                         GL_texminfilt=GL_NEAREST;
 402                 }
 403         }
 404         if ((t=FindArg("-gl_texmagfilt")) || (t=FindArg("-gl_texmagfilter"))){
 405                 if (t>=glt)//allow overriding of earlier args
 406                         GL_texmagfilt=ogl_atotexfilti(Args[t+1],0);
 407         }
 408         if ((t=FindArg("-gl_texminfilt")) || (t=FindArg("-gl_texminfilter"))){
 409                 if (t>=glt)//allow overriding of earlier args
 410                         GL_texminfilt=ogl_atotexfilti(Args[t+1],1);
 411         }
 412         GL_needmipmaps=ogl_testneedmipmaps(GL_texminfilt);
 413         mprintf((0,"gr_init: texmagfilt:%x texminfilt:%x needmipmaps=%i\n",GL_texmagfilt,GL_texminfilt,GL_needmipmaps));
 414
 415         if ((t=FindArg("-gl_vidmem"))){
 416                 ogl_mem_target=atoi(Args[t+1])*1024*1024;
 417         }
 418         if ((t=FindArg("-gl_reticle"))){
 419                 gl_reticle=atoi(Args[t+1]);
 420         }
 421         //printf("ogl_mem_target=%i\n",ogl_mem_target);
 422
 423         ogl_init();//platform specific initialization
 424
 425         ogl_init_texture_list_internal();
 426
 427         MALLOC( grd_curscreen,grs_screen,1 );
 428         memset( grd_curscreen, 0, sizeof(grs_screen));
 429         grd_curscreen->sc_canvas.cv_bitmap.bm_data = NULL;
 430
 431         // Set the mode.
 432         if ((retcode=gr_set_mode(mode)))
 433         {
 434                 return retcode;
 435         }
 436
 437         grd_curscreen->sc_canvas.cv_color = 0;
 438         grd_curscreen->sc_canvas.cv_drawmode = 0;
 439         grd_curscreen->sc_canvas.cv_font = NULL;
 440         grd_curscreen->sc_canvas.cv_font_fg_color = 0;
 441         grd_curscreen->sc_canvas.cv_font_bg_color = 0;
 442         gr_set_current_canvas( &grd_curscreen->sc_canvas );
 443
 444         gr_installed = 1;
 445
 446         atexit(gr_close);
 447
 448         return 0;
 449 }
 450
 451 void gr_close()
 452 {
 453 //      mprintf((0,"ogl init: %s %s %s - %s\n",glGetString(GL_VENDOR),glGetString(GL_RENDERER),glGetString(GL_VERSION),glGetString,(GL_EXTENSIONS)));
 454
 455         ogl_close();//platform specific code
 456         if (grd_curscreen){
 457                 if (grd_curscreen->sc_canvas.cv_bitmap.bm_data)
 458                         d_free(grd_curscreen->sc_canvas.cv_bitmap.bm_data);
 459                 d_free(grd_curscreen);
 460         }
 461 #ifdef OGL_RUNTIME_LOAD
 462         if (ogl_rt_loaded)
 463                 OpenGL_LoadLibrary(false);
 464 #endif
 465 }
 466 extern int r_upixelc;
 467 void ogl_upixelc(int x, int y, int c){
 468         r_upixelc++;
 469 //      printf("gr_upixelc(%i,%i,%i)%i\n",x,y,c,Function_mode==FMODE_GAME);
 470 //      if(Function_mode != FMODE_GAME){
 471 //              grd_curcanv->cv_bitmap.bm_data[y*grd_curscreen->sc_canvas.cv_bitmap.bm_w+x]=c;
 472 //      }else{
 473                 OGL_DISABLE(TEXTURE_2D);
 474                 glPointSize(1.0);
 475                 glBegin(GL_POINTS);
 476 //              glBegin(GL_LINES);
 477 //      ogl_pal=gr_current_pal;
 478                 glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 479 //      ogl_pal=gr_palette;
 480                 glVertex2f((x+grd_curcanv->cv_bitmap.bm_x)/(float)last_width,1.0-(y+grd_curcanv->cv_bitmap.bm_y)/(float)last_height);
 481 //              glVertex2f(x/((float)last_width+1),1.0-y/((float)last_height+1));
 482                 glEnd();
 483 //      }
 484 }
 485 void ogl_urect(int left,int top,int right,int bot){
 486         GLfloat xo,yo,xf,yf;
 487         int c=COLOR;
 488
 489         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 490         xf = (right + 1 + grd_curcanv->cv_bitmap.bm_x) / (float)last_width;
 491         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 492         yf = 1.0 - (bot + 1 + grd_curcanv->cv_bitmap.bm_y) / (float)last_height;
 493
 494         OGL_DISABLE(TEXTURE_2D);
 495         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 496         glBegin(GL_QUADS);
 497         glVertex2f(xo,yo);
 498         glVertex2f(xo,yf);
 499         glVertex2f(xf,yf);
 500         glVertex2f(xf,yo);
 501         glEnd();
 502 }
 503 void ogl_ulinec(int left,int top,int right,int bot,int c){
 504         GLfloat xo,yo,xf,yf;
 505
 506         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 507         xf=(right+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 508         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 509         yf=1.0-(bot+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 510
 511         OGL_DISABLE(TEXTURE_2D);
 512         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 513         glBegin(GL_LINES);
 514         glVertex2f(xo,yo);
 515         glVertex2f(xf,yf);
 516         glEnd();
 517 }
 518
 519
 520 GLfloat last_r=0, last_g=0, last_b=0;
 521 int do_pal_step=0;
 522 void ogl_do_palfx(void){
 523 //      GLfloat r,g,b,a;
 524         OGL_DISABLE(TEXTURE_2D);
 525         if (gr_palette_faded_out){
 526 /*              glEnable(GL_BLEND);
 527                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);*/
 528                 glColor3f(0,0,0);
 529 //              r=g=b=0.0;a=1.0;
 530         }else{
 531                 if (do_pal_step){
 532                         //glBlendFunc(GL_SRC_COLOR, GL_DST_COLOR);
 533                         glEnable(GL_BLEND);
 534                         glBlendFunc(GL_ONE,GL_ONE);
 535                         glColor3f(last_r,last_g,last_b);
 536 //                      r=f2fl(last_r);g=f2fl(last_g);b=f2fl(last_b);a=0.5;
 537                 }else
 538                         return;
 539         }
 540
 541
 542         glBegin(GL_QUADS);
 543         glVertex2f(0,0);
 544         glVertex2f(0,1);
 545         glVertex2f(1,1);
 546         glVertex2f(1,0);
 547         glEnd();
 548
 549         glEnable(GL_BLEND);
 550         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 551 }
 552
 553 void gr_palette_clear()
 554 {
 555         gr_palette_faded_out=1;
 556 }
 557
 558
 559 void gr_palette_step_up( int r, int g, int b )
 560 {
 561         if (gr_palette_faded_out) return;
 562
 563 //      if ( (r==last_r) && (g==last_g) && (b==last_b) ) return;
 564
 565 /*      last_r = r/63.0;
 566         last_g = g/63.0;
 567         last_b = b/63.0;
 568         do_pal_step=(r || g || b);*/
 569
 570         last_r = (r+gr_palette_gamma)/63.0;
 571         last_g = (g+gr_palette_gamma)/63.0;
 572         last_b = (b+gr_palette_gamma)/63.0;
 573
 574         do_pal_step=(r || g || b || gr_palette_gamma);
 575
 576 }
 577
 578 //added on 980913 by adb to fix palette problems
 579 // need a min without side effects...
 580 #undef min
 581 static inline int min(int x, int y) { return x < y ? x : y; }
 582 //end changes by adb
 583
 584 void gr_palette_load( ubyte *pal )
 585 {
 586  int i;//, j;
 587
 588  for (i=0; i<768; i++ ) {
 589      gr_current_pal[i] = pal[i];
 590      if (gr_current_pal[i] > 63) gr_current_pal[i] = 63;
 591  }
 592  //palette = screen->format->palette;
 593
 594  gr_palette_faded_out=0;
 595
 596  init_computed_colors();
 597 }
 598
 599
 600
 601 int gr_palette_fade_out(ubyte *pal, int nsteps, int allow_keys)
 602 {
 603         gr_palette_faded_out=1;
 604         return 0;
 605 }
 606
 607
 608
 609 int gr_palette_fade_in(ubyte *pal, int nsteps, int allow_keys)
 610 {
 611         gr_palette_faded_out=0;
 612         return 0;
 613 }
 614
 615
 616
 617 void gr_palette_read(ubyte * pal)
 618 {
 619         int i;
 620         for (i=0; i<768; i++ ) {
 621                 pal[i]=gr_current_pal[i];
 622                 if (pal[i] > 63) pal[i] = 63;
 623         }
 624 }
 625
 626 //writes out an uncompressed RGB .tga file
 627 //if we got really spiffy, we could optionally link in libpng or something, and use that.
 628 void write_bmp(char *savename,int w,int h,unsigned char *buf){
 629         int f;
 630 #ifdef _WIN32
 631         f=open(savename,O_CREAT|O_EXCL|O_WRONLY,S_IREAD|S_IWRITE);
 632 #else
 633         f=open(savename,O_CREAT|O_EXCL|O_WRONLY,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 634 #endif
 635         if (f>=0){
 636                 GLubyte    targaMagic[12] = { 0, //no identification field
 637                          0,//no colormap
 638                          2,//RGB image (well, BGR, actually)
 639                          0, 0, 0, 0, 0, 0, 0, 0, 0 };//no colormap or image origin stuff.
 640                 GLubyte blah;
 641                 int r;
 642                 GLubyte *s;
 643                 int x,y;
 644
 645                 //write .TGA header.
 646                 write (f,targaMagic,sizeof(targaMagic));
 647                 blah=w%256;write (f,&blah,1);//w, low
 648                 blah=w/256;write (f,&blah,1);//w, high
 649                 blah=h%256;write (f,&blah,1);//h, low
 650                 blah=h/256;write (f,&blah,1);//h, high
 651                 blah=24;write (f,&blah,1);//24 bpp
 652                 blah=0;write (f,&blah,1);//no attribute bits, origin is lowerleft, no interleave
 653
 654                 s=buf;
 655                 for (y=0;y<h;y++){//TGAs use BGR ordering of data.
 656                         for (x=0;x<w;x++){
 657                                 blah=s[0];
 658                                 s[0]=s[2];
 659                                 s[2]=blah;
 660                                 s+=3;
 661                         }
 662                 }
 663                 x=0;y=w*h*3;
 664                 while (x<y){
 665                         r=write(f,buf+x,y);
 666                         if (r<=0){
 667                                 mprintf((0,"screenshot error, couldn't write to %s (err %i)\n",savename,errno));
 668                                 break;
 669                         }
 670                         x+=r;y-=r;
 671                 }
 672                 close(f);
 673         }else{
 674                 mprintf((0,"screenshot error, couldn't open %s (err %i)\n",savename,errno));
 675         }
 676 }
 677 void save_screen_shot(int automap_flag)
 678 {
 679 //      fix t1;
 680         char message[100];
 681         static int savenum=0;
 682         char savename[13];
 683         unsigned char *buf;
 684
 685         if (!ogl_readpixels_ok){
 686                 if (!automap_flag)
 687                         hud_message(MSGC_GAME_FEEDBACK,"glReadPixels not supported on your configuration");
 688                 return;
 689         }
 690
 691         stop_time();
 692
 693 //added/changed on 10/31/98 by Victor Rachels to fix overwrite each new game
 694         if ( savenum == 9999 ) savenum = 0;
 695         sprintf(savename,"scrn%04d.tga",savenum++);
 696
 697         while(!access(savename,0))
 698         {
 699                 if ( savenum == 9999 ) savenum = 0;
 700                 sprintf(savename,"scrn%04d.tga",savenum++);
 701         }
 702         sprintf( message, "%s '%s'", TXT_DUMPING_SCREEN, savename );
 703 //end this section addition/change - Victor Rachels
 704
 705         if (automap_flag) {
 706 //      save_font = grd_curcanv->cv_font;
 707 //      gr_set_curfont(GAME_FONT);
 708 //      gr_set_fontcolor(gr_find_closest_color_current(0,31,0),-1);
 709 //      gr_get_string_size(message,&w,&h,&aw);
 710 //              modex_print_message(32, 2, message);
 711         } else {
 712                 hud_message(MSGC_GAME_FEEDBACK,message);
 713         }
 714
 715         buf = d_malloc(grd_curscreen->sc_w*grd_curscreen->sc_h*3);
 716         glReadBuffer(GL_FRONT);
 717         glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 718         write_bmp(savename,grd_curscreen->sc_w,grd_curscreen->sc_h,buf);
 719         d_free(buf);
 720
 721         key_flush();
 722         start_time();
 723 }