arch/ogl/gr.c

   1 /* $Id: gr.c,v 1.13 2003-04-11 23:51:48 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 __WINDOWS__
  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 #include <unistd.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <fcntl.h>
  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
  49 #define DECLARE_VARS
  50 #include "ogl_init.h"
  51 #if defined(__APPLE__) && defined(__MACH__)
  52 #include <OpenGL/glu.h>
  53 #undef GL_ARB_multitexture // hack!
  54 #else
  55 #include <GL/glu.h>
  56 #endif
  57
  58 int ogl_voodoohack=0;
  59
  60 int gr_installed = 0;
  61
  62
  63 void gr_palette_clear(); // Function prototype for gr_init;
  64 int gl_initialized=0;
  65 int gl_reticle = 0;
  66
  67 int ogl_fullscreen=0;
  68
  69 int gr_check_fullscreen(void){
  70         return ogl_fullscreen;
  71 }
  72
  73 void gr_do_fullscreen(int f){
  74         if (ogl_voodoohack)
  75                 ogl_fullscreen=1;//force fullscreen mode on voodoos.
  76         else
  77                 ogl_fullscreen=f;
  78         if (gl_initialized){
  79                 ogl_do_fullscreen_internal();
  80         }
  81 }
  82
  83 int gr_toggle_fullscreen(void){
  84         gr_do_fullscreen(!ogl_fullscreen);
  85         //      grd_curscreen->sc_mode=0;//hack to get it to reset screen mode
  86         return ogl_fullscreen;
  87 }
  88
  89 int arch_toggle_fullscreen_menu(void){
  90         unsigned char *buf=NULL;
  91
  92         if (ogl_readpixels_ok){
  93                 MALLOC(buf,unsigned char,grd_curscreen->sc_w*grd_curscreen->sc_h*3);
  94                 glReadBuffer(GL_FRONT);
  95                 glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
  96         }
  97
  98         gr_do_fullscreen(!ogl_fullscreen);
  99
 100         if (ogl_readpixels_ok){
 101 //              glWritePixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 102                 glRasterPos2f(0,0);
 103                 glDrawPixels(grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 104                 free(buf);
 105         }
 106         //      grd_curscreen->sc_mode=0;//hack to get it to reset screen mode
 107
 108         return ogl_fullscreen;
 109 }
 110
 111 void ogl_init_state(void){
 112         /* select clearing (background) color   */
 113         glClearColor(0.0, 0.0, 0.0, 0.0);
 114         glShadeModel(GL_SMOOTH);
 115
 116         /* initialize viewing values */
 117         glMatrixMode(GL_PROJECTION);
 118         glLoadIdentity();
 119         glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 120         glScalef(1.0, -1.0, 1.0);
 121         glTranslatef(0.0, -1.0, 0.0);
 122         gr_palette_step_up(0,0,0);//in case its left over from in game
 123 }
 124
 125 int last_screen_mode=-1;
 126
 127 void ogl_set_screen_mode(void){
 128         if (last_screen_mode==Screen_mode)
 129                 return;
 130         OGL_VIEWPORT(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h);
 131 //      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);
 132         if (Screen_mode==SCREEN_GAME){
 133                 glDrawBuffer(GL_BACK);
 134         }else{
 135                 glClearColor(0.0, 0.0, 0.0, 0.0);
 136                 glDrawBuffer(GL_FRONT);
 137                 glClear(GL_COLOR_BUFFER_BIT);
 138                 glMatrixMode(GL_PROJECTION);
 139                 glLoadIdentity();//clear matrix
 140                 glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
 141                 glMatrixMode(GL_MODELVIEW);
 142                 glLoadIdentity();//clear matrix
 143                 glEnable(GL_BLEND);
 144                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 145         }
 146         last_screen_mode=Screen_mode;
 147 }
 148
 149 void gr_update()
 150 {
 151         if (gl_initialized){
 152
 153                 if(Screen_mode != SCREEN_GAME){
 154                         glFlush();
 155                 }
 156         }
 157 }
 158
 159 const char *gl_vendor,*gl_renderer,*gl_version,*gl_extensions;
 160
 161 void ogl_get_verinfo(void){
 162         int t;
 163         gl_vendor=glGetString(GL_VENDOR);
 164         gl_renderer=glGetString(GL_RENDERER);
 165         gl_version=glGetString(GL_VERSION);
 166         gl_extensions=glGetString(GL_EXTENSIONS);
 167
 168         con_printf(CON_VERBOSE, "gl vendor:%s renderer:%s version:%s extensions:%s\n",gl_vendor,gl_renderer,gl_version,gl_extensions);
 169
 170         ogl_intensity4_ok=1;ogl_luminance4_alpha4_ok=1;ogl_rgba2_ok=1;ogl_gettexlevelparam_ok=1;
 171
 172 #ifdef __WINDOWS__
 173         dglMultiTexCoord2fARB = (glMultiTexCoord2fARB_fp)wglGetProcAddress("glMultiTexCoord2fARB");
 174         dglActiveTextureARB = (glActiveTextureARB_fp)wglGetProcAddress("glActiveTextureARB");
 175         dglMultiTexCoord2fSGIS = (glMultiTexCoord2fSGIS_fp)wglGetProcAddress("glMultiTexCoord2fSGIS");
 176         dglSelectTextureSGIS = (glSelectTextureSGIS_fp)wglGetProcAddress("glSelectTextureSGIS");
 177 #endif
 178
 179         //multitexturing doesn't work yet.
 180 #ifdef GL_ARB_multitexture
 181         ogl_arb_multitexture_ok=0;//(strstr(gl_extensions,"GL_ARB_multitexture")!=0 && glActiveTextureARB!=0 && 0);
 182         mprintf((0,"c:%p d:%p e:%p\n",strstr(gl_extensions,"GL_ARB_multitexture"),glActiveTextureARB,glBegin));
 183 #endif
 184 #ifdef GL_SGIS_multitexture
 185         ogl_sgis_multitexture_ok=0;//(strstr(gl_extensions,"GL_SGIS_multitexture")!=0 && glSelectTextureSGIS!=0 && 0);
 186         mprintf((0,"a:%p b:%p\n",strstr(gl_extensions,"GL_SGIS_multitexture"),glSelectTextureSGIS));
 187 #endif
 188
 189         //add driver specific hacks here.  whee.
 190         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){
 191                 ogl_intensity4_ok=0;//ignores alpha, always black background instead of transparent.
 192                 ogl_readpixels_ok=0;//either just returns all black, or kills the X server entirely
 193                 ogl_gettexlevelparam_ok=0;//returns random data..
 194         }
 195         if (stricmp(gl_vendor,"Matrox Graphics Inc.")==0){
 196                 //displays garbage. reported by
 197                 //  redomen@crcwnet.com (render="Matrox G400" version="1.1.3 5.52.015")
 198                 //  orulz (Matrox G200)
 199                 ogl_intensity4_ok=0;
 200         }
 201
 202         //allow overriding of stuff.
 203 #ifdef GL_ARB_multitexture
 204         if ((t=FindArg("-gl_arb_multitexture_ok"))){
 205                 ogl_arb_multitexture_ok=atoi(Args[t+1]);
 206         }
 207 #endif
 208 #ifdef GL_SGIS_multitexture
 209         if ((t=FindArg("-gl_sgis_multitexture_ok"))){
 210                 ogl_sgis_multitexture_ok=atoi(Args[t+1]);
 211         }
 212 #endif
 213         if ((t=FindArg("-gl_intensity4_ok"))){
 214                 ogl_intensity4_ok=atoi(Args[t+1]);
 215         }
 216         if ((t=FindArg("-gl_luminance4_alpha4_ok"))){
 217                 ogl_luminance4_alpha4_ok=atoi(Args[t+1]);
 218         }
 219         if ((t=FindArg("-gl_rgba2_ok"))){
 220                 ogl_rgba2_ok=atoi(Args[t+1]);
 221         }
 222         if ((t=FindArg("-gl_readpixels_ok"))){
 223                 ogl_readpixels_ok=atoi(Args[t+1]);
 224         }
 225         if ((t=FindArg("-gl_gettexlevelparam_ok"))){
 226                 ogl_gettexlevelparam_ok=atoi(Args[t+1]);
 227         }
 228
 229         con_printf(CON_VERBOSE, "gl_arb_multitexture:%i gl_sgis_multitexture:%i\n",ogl_arb_multitexture_ok,ogl_sgis_multitexture_ok);
 230         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);
 231 }
 232
 233 int gr_set_mode(u_int32_t mode)
 234 {
 235         unsigned int w,h;
 236         char *gr_bm_data;
 237
 238 #ifdef NOGRAPH
 239 return 0;
 240 #endif
 241 //      mode=0;
 242         if (mode<=0)
 243                 return 0;
 244
 245         w=SM_W(mode);
 246         h=SM_H(mode);
 247
 248         //if (screen != NULL) gr_palette_clear();
 249
 250 //      ogl_init_state();
 251
 252         gr_bm_data=grd_curscreen->sc_canvas.cv_bitmap.bm_data;//since we use realloc, we want to keep this pointer around.
 253         memset( grd_curscreen, 0, sizeof(grs_screen));
 254         grd_curscreen->sc_mode = mode;
 255         grd_curscreen->sc_w = w;
 256         grd_curscreen->sc_h = h;
 257         grd_curscreen->sc_aspect = fixdiv(grd_curscreen->sc_w*3,grd_curscreen->sc_h*4);
 258         grd_curscreen->sc_canvas.cv_bitmap.bm_x = 0;
 259         grd_curscreen->sc_canvas.cv_bitmap.bm_y = 0;
 260         grd_curscreen->sc_canvas.cv_bitmap.bm_w = w;
 261         grd_curscreen->sc_canvas.cv_bitmap.bm_h = h;
 262         //grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = screen->pitch;
 263         grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = w;
 264         grd_curscreen->sc_canvas.cv_bitmap.bm_type = BM_OGL;
 265         //grd_curscreen->sc_canvas.cv_bitmap.bm_data = (unsigned char *)screen->pixels;
 266 //      mprintf((0,"ogl/gr.c: reallocing %p to %i\n",grd_curscreen->sc_canvas.cv_bitmap.bm_data,w*h));
 267         grd_curscreen->sc_canvas.cv_bitmap.bm_data = d_realloc(gr_bm_data,w*h);
 268         gr_set_current_canvas(NULL);
 269         //gr_enable_default_palette_loading();
 270
 271         ogl_init_window(w,h);//platform specific code
 272
 273         ogl_get_verinfo();
 274
 275         OGL_VIEWPORT(0,0,w,h);
 276
 277         ogl_set_screen_mode();
 278
 279 //      gamefont_choose_game_font(w,h);
 280
 281         return 0;
 282 }
 283
 284 #define GLstrcmptestr(a,b) if (stricmp(a,#b)==0 || stricmp(a,"GL_" #b)==0)return GL_ ## b;
 285 int ogl_atotexfilti(char *a,int min){
 286         GLstrcmptestr(a,NEAREST);
 287         GLstrcmptestr(a,LINEAR);
 288         if (min){//mipmaps are valid only for the min filter
 289                 GLstrcmptestr(a,NEAREST_MIPMAP_NEAREST);
 290                 GLstrcmptestr(a,NEAREST_MIPMAP_LINEAR);
 291                 GLstrcmptestr(a,LINEAR_MIPMAP_NEAREST);
 292                 GLstrcmptestr(a,LINEAR_MIPMAP_LINEAR);
 293         }
 294         Error("unknown/invalid texture filter %s\n",a);
 295 //      return GL_NEAREST;
 296 }
 297 int ogl_testneedmipmaps(int i){
 298         switch (i){
 299                 case GL_NEAREST:
 300                 case GL_LINEAR:
 301                         return 0;
 302                 case GL_NEAREST_MIPMAP_NEAREST:
 303                 case GL_NEAREST_MIPMAP_LINEAR:
 304                 case GL_LINEAR_MIPMAP_NEAREST:
 305                 case GL_LINEAR_MIPMAP_LINEAR:
 306                         return 1;
 307         }
 308         Error("unknown texture filter %x\n",i);
 309 //      return -1;
 310 }
 311 #ifdef OGL_RUNTIME_LOAD
 312 #if defined(__WINDOWS__) || defined(__MINGW32__)
 313 char *OglLibPath="opengl32.dll";
 314 #endif
 315 #ifdef __unix__
 316 char *OglLibPath="libGL.so";
 317 #endif
 318
 319 int ogl_rt_loaded=0;
 320 int ogl_init_load_library(void)
 321 {
 322         int retcode=0;
 323         if (!ogl_rt_loaded){
 324                 int t;
 325                 if ((t=FindArg("-gl_library")))
 326                         OglLibPath=Args[t+1];
 327
 328                 retcode = OpenGL_LoadLibrary(true);
 329                 if(retcode)
 330                 {
 331                         mprintf((0,"Opengl loaded ok\n"));
 332
 333                         if(!glEnd)
 334                         {
 335                                 Error("Opengl: Functions not imported\n");
 336                         }
 337                 }else{
 338                         Error("Opengl: error loading %s\n",OglLibPath);
 339                 }
 340                 ogl_rt_loaded=1;
 341         }
 342         return retcode;
 343 }
 344 #endif
 345
 346 int gr_init()
 347 {
 348         int mode = SM(640,480);
 349         int retcode, t, glt = 0;
 350
 351         // Only do this function once!
 352         if (gr_installed==1)
 353                 return -1;
 354
 355
 356 #ifdef OGL_RUNTIME_LOAD
 357         ogl_init_load_library();
 358 #endif
 359
 360 #ifdef GR_SUPPORTS_FULLSCREEN_TOGGLE
 361         if (FindArg("-gl_voodoo")){
 362                 ogl_voodoohack=1;
 363                 gr_toggle_fullscreen();
 364         }
 365         if (FindArg("-fullscreen"))
 366                 gr_toggle_fullscreen();
 367 #endif
 368         if ((glt=FindArg("-gl_alttexmerge")))
 369                 ogl_alttexmerge=1;
 370         if ((t=FindArg("-gl_stdtexmerge")))
 371                 if (t>=glt)//allow overriding of earlier args
 372                         ogl_alttexmerge=0;
 373
 374         if ((glt=FindArg("-gl_16bittextures")))
 375                 ogl_rgba_format=GL_RGB5_A1;
 376
 377         if ((glt=FindArg("-gl_mipmap"))){
 378                 GL_texmagfilt=GL_LINEAR;
 379                 GL_texminfilt=GL_LINEAR_MIPMAP_NEAREST;
 380         }
 381         if ((t=FindArg("-gl_simple"))){
 382                 if (t>=glt){//allow overriding of earlier args
 383                         glt=t;
 384                         GL_texmagfilt=GL_NEAREST;
 385                         GL_texminfilt=GL_NEAREST;
 386                 }
 387         }
 388         if ((t=FindArg("-gl_texmagfilt")) || (t=FindArg("-gl_texmagfilter"))){
 389                 if (t>=glt)//allow overriding of earlier args
 390                         GL_texmagfilt=ogl_atotexfilti(Args[t+1],0);
 391         }
 392         if ((t=FindArg("-gl_texminfilt")) || (t=FindArg("-gl_texminfilter"))){
 393                 if (t>=glt)//allow overriding of earlier args
 394                         GL_texminfilt=ogl_atotexfilti(Args[t+1],1);
 395         }
 396         GL_needmipmaps=ogl_testneedmipmaps(GL_texminfilt);
 397         mprintf((0,"gr_init: texmagfilt:%x texminfilt:%x needmipmaps=%i\n",GL_texmagfilt,GL_texminfilt,GL_needmipmaps));
 398
 399         if ((t=FindArg("-gl_vidmem"))){
 400                 ogl_mem_target=atoi(Args[t+1])*1024*1024;
 401         }
 402         if ((t=FindArg("-gl_reticle"))){
 403                 gl_reticle=atoi(Args[t+1]);
 404         }
 405         //printf("ogl_mem_target=%i\n",ogl_mem_target);
 406
 407         ogl_init();//platform specific initialization
 408
 409         ogl_init_texture_list_internal();
 410
 411         MALLOC( grd_curscreen,grs_screen,1 );
 412         memset( grd_curscreen, 0, sizeof(grs_screen));
 413         grd_curscreen->sc_canvas.cv_bitmap.bm_data = NULL;
 414
 415         // Set the mode.
 416         if ((retcode=gr_set_mode(mode)))
 417         {
 418                 return retcode;
 419         }
 420
 421         grd_curscreen->sc_canvas.cv_color = 0;
 422         grd_curscreen->sc_canvas.cv_drawmode = 0;
 423         grd_curscreen->sc_canvas.cv_font = NULL;
 424         grd_curscreen->sc_canvas.cv_font_fg_color = 0;
 425         grd_curscreen->sc_canvas.cv_font_bg_color = 0;
 426         gr_set_current_canvas( &grd_curscreen->sc_canvas );
 427
 428         gr_installed = 1;
 429
 430         atexit(gr_close);
 431
 432         return 0;
 433 }
 434
 435 void gr_close()
 436 {
 437 //      mprintf((0,"ogl init: %s %s %s - %s\n",glGetString(GL_VENDOR),glGetString(GL_RENDERER),glGetString(GL_VERSION),glGetString,(GL_EXTENSIONS)));
 438
 439         ogl_close();//platform specific code
 440         if (grd_curscreen){
 441                 if (grd_curscreen->sc_canvas.cv_bitmap.bm_data)
 442                         d_free(grd_curscreen->sc_canvas.cv_bitmap.bm_data);
 443                 d_free(grd_curscreen);
 444         }
 445 #ifdef OGL_RUNTIME_LOAD
 446         if (ogl_rt_loaded)
 447                 OpenGL_LoadLibrary(false);
 448 #endif
 449 }
 450 extern int r_upixelc;
 451 void ogl_upixelc(int x, int y, int c){
 452         r_upixelc++;
 453 //      printf("gr_upixelc(%i,%i,%i)%i\n",x,y,c,Function_mode==FMODE_GAME);
 454 //      if(Function_mode != FMODE_GAME){
 455 //              grd_curcanv->cv_bitmap.bm_data[y*grd_curscreen->sc_canvas.cv_bitmap.bm_w+x]=c;
 456 //      }else{
 457                 OGL_DISABLE(TEXTURE_2D);
 458                 glPointSize(1.0);
 459                 glBegin(GL_POINTS);
 460 //              glBegin(GL_LINES);
 461 //      ogl_pal=gr_current_pal;
 462                 glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 463 //      ogl_pal=gr_palette;
 464                 glVertex2f((x+grd_curcanv->cv_bitmap.bm_x)/(float)last_width,1.0-(y+grd_curcanv->cv_bitmap.bm_y)/(float)last_height);
 465 //              glVertex2f(x/((float)last_width+1),1.0-y/((float)last_height+1));
 466                 glEnd();
 467 //      }
 468 }
 469 void ogl_urect(int left,int top,int right,int bot){
 470         GLfloat xo,yo,xf,yf;
 471         int c=COLOR;
 472
 473         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 474         xf=(right+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 475         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 476         yf=1.0-(bot+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 477
 478         OGL_DISABLE(TEXTURE_2D);
 479         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 480         glBegin(GL_QUADS);
 481         glVertex2f(xo,yo);
 482         glVertex2f(xo,yf);
 483         glVertex2f(xf,yf);
 484         glVertex2f(xf,yo);
 485         glEnd();
 486 }
 487 void ogl_ulinec(int left,int top,int right,int bot,int c){
 488         GLfloat xo,yo,xf,yf;
 489
 490         xo=(left+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 491         xf=(right+grd_curcanv->cv_bitmap.bm_x)/(float)last_width;
 492         yo=1.0-(top+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 493         yf=1.0-(bot+grd_curcanv->cv_bitmap.bm_y)/(float)last_height;
 494
 495         OGL_DISABLE(TEXTURE_2D);
 496         glColor3f(CPAL2Tr(c),CPAL2Tg(c),CPAL2Tb(c));
 497         glBegin(GL_LINES);
 498         glVertex2f(xo,yo);
 499         glVertex2f(xf,yf);
 500         glEnd();
 501 }
 502
 503
 504 GLfloat last_r=0, last_g=0, last_b=0;
 505 int do_pal_step=0;
 506 void ogl_do_palfx(void){
 507 //      GLfloat r,g,b,a;
 508         OGL_DISABLE(TEXTURE_2D);
 509         if (gr_palette_faded_out){
 510 /*              glEnable(GL_BLEND);
 511                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);*/
 512                 glColor3f(0,0,0);
 513 //              r=g=b=0.0;a=1.0;
 514         }else{
 515                 if (do_pal_step){
 516                         //glBlendFunc(GL_SRC_COLOR, GL_DST_COLOR);
 517                         glEnable(GL_BLEND);
 518                         glBlendFunc(GL_ONE,GL_ONE);
 519                         glColor3f(last_r,last_g,last_b);
 520 //                      r=f2fl(last_r);g=f2fl(last_g);b=f2fl(last_b);a=0.5;
 521                 }else
 522                         return;
 523         }
 524
 525
 526         glBegin(GL_QUADS);
 527         glVertex2f(0,0);
 528         glVertex2f(0,1);
 529         glVertex2f(1,1);
 530         glVertex2f(1,0);
 531         glEnd();
 532
 533         glEnable(GL_BLEND);
 534         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 535 }
 536
 537 void gr_palette_clear()
 538 {
 539         gr_palette_faded_out=1;
 540 }
 541
 542
 543 void gr_palette_step_up( int r, int g, int b )
 544 {
 545         if (gr_palette_faded_out) return;
 546
 547 //      if ( (r==last_r) && (g==last_g) && (b==last_b) ) return;
 548
 549 /*      last_r = r/63.0;
 550         last_g = g/63.0;
 551         last_b = b/63.0;
 552         do_pal_step=(r || g || b);*/
 553
 554         last_r = (r+gr_palette_gamma)/63.0;
 555         last_g = (g+gr_palette_gamma)/63.0;
 556         last_b = (b+gr_palette_gamma)/63.0;
 557
 558         do_pal_step=(r || g || b || gr_palette_gamma);
 559
 560 }
 561
 562 //added on 980913 by adb to fix palette problems
 563 // need a min without side effects...
 564 #undef min
 565 static inline int min(int x, int y) { return x < y ? x : y; }
 566 //end changes by adb
 567
 568 void gr_palette_load( ubyte *pal )
 569 {
 570  int i;//, j;
 571
 572  for (i=0; i<768; i++ ) {
 573      gr_current_pal[i] = pal[i];
 574      if (gr_current_pal[i] > 63) gr_current_pal[i] = 63;
 575  }
 576  //palette = screen->format->palette;
 577
 578  gr_palette_faded_out=0;
 579
 580  init_computed_colors();
 581 }
 582
 583
 584
 585 int gr_palette_fade_out(ubyte *pal, int nsteps, int allow_keys)
 586 {
 587         gr_palette_faded_out=1;
 588         return 0;
 589 }
 590
 591
 592
 593 int gr_palette_fade_in(ubyte *pal, int nsteps, int allow_keys)
 594 {
 595         gr_palette_faded_out=0;
 596         return 0;
 597 }
 598
 599
 600
 601 void gr_palette_read(ubyte * pal)
 602 {
 603         int i;
 604         for (i=0; i<768; i++ ) {
 605                 pal[i]=gr_current_pal[i];
 606                 if (pal[i] > 63) pal[i] = 63;
 607         }
 608 }
 609
 610 //writes out an uncompressed RGB .tga file
 611 //if we got really spiffy, we could optionally link in libpng or something, and use that.
 612 void write_bmp(char *savename,int w,int h,unsigned char *buf){
 613         int f;
 614 #if defined(__WINDOWS__) || defined(__MINGW32__)
 615         f=open(savename,O_CREAT|O_EXCL|O_WRONLY,S_IRUSR|S_IWUSR);
 616 #else
 617         f=open(savename,O_CREAT|O_EXCL|O_WRONLY,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
 618 #endif
 619         if (f>=0){
 620                 GLubyte    targaMagic[12] = { 0, //no identification field
 621                          0,//no colormap
 622                          2,//RGB image (well, BGR, actually)
 623                          0, 0, 0, 0, 0, 0, 0, 0, 0 };//no colormap or image origin stuff.
 624                 GLubyte blah;
 625                 int r;
 626                 GLubyte *s;
 627                 int x,y;
 628
 629                 //write .TGA header.
 630                 write (f,targaMagic,sizeof(targaMagic));
 631                 blah=w%256;write (f,&blah,1);//w, low
 632                 blah=w/256;write (f,&blah,1);//w, high
 633                 blah=h%256;write (f,&blah,1);//h, low
 634                 blah=h/256;write (f,&blah,1);//h, high
 635                 blah=24;write (f,&blah,1);//24 bpp
 636                 blah=0;write (f,&blah,1);//no attribute bits, origin is lowerleft, no interleave
 637
 638                 s=buf;
 639                 for (y=0;y<h;y++){//TGAs use BGR ordering of data.
 640                         for (x=0;x<w;x++){
 641                                 blah=s[0];
 642                                 s[0]=s[2];
 643                                 s[2]=blah;
 644                                 s+=3;
 645                         }
 646                 }
 647                 x=0;y=w*h*3;
 648                 while (x<y){
 649                         r=write(f,buf+x,y);
 650                         if (r<=0){
 651                                 mprintf((0,"screenshot error, couldn't write to %s (err %i)\n",savename,errno));
 652                                 break;
 653                         }
 654                         x+=r;y-=r;
 655                 }
 656                 close(f);
 657         }else{
 658                 mprintf((0,"screenshot error, couldn't open %s (err %i)\n",savename,errno));
 659         }
 660 }
 661 void save_screen_shot(int automap_flag)
 662 {
 663 //      fix t1;
 664         char message[100];
 665         static int savenum=0;
 666         char savename[13];
 667         unsigned char *buf;
 668
 669         if (!ogl_readpixels_ok){
 670                 if (!automap_flag)
 671                         hud_message(MSGC_GAME_FEEDBACK,"glReadPixels not supported on your configuration");
 672                 return;
 673         }
 674
 675         stop_time();
 676
 677 //added/changed on 10/31/98 by Victor Rachels to fix overwrite each new game
 678         if ( savenum == 9999 ) savenum = 0;
 679         sprintf(savename,"scrn%04d.tga",savenum++);
 680
 681         while(!access(savename,0))
 682         {
 683                 if ( savenum == 9999 ) savenum = 0;
 684                 sprintf(savename,"scrn%04d.tga",savenum++);
 685         }
 686         sprintf( message, "%s '%s'", TXT_DUMPING_SCREEN, savename );
 687 //end this section addition/change - Victor Rachels
 688
 689         if (automap_flag) {
 690 //      save_font = grd_curcanv->cv_font;
 691 //      gr_set_curfont(GAME_FONT);
 692 //      gr_set_fontcolor(gr_find_closest_color_current(0,31,0),-1);
 693 //      gr_get_string_size(message,&w,&h,&aw);
 694 //              modex_print_message(32, 2, message);
 695         } else {
 696                 hud_message(MSGC_GAME_FEEDBACK,message);
 697         }
 698
 699         buf = d_malloc(grd_curscreen->sc_w*grd_curscreen->sc_h*3);
 700         glReadBuffer(GL_FRONT);
 701         glReadPixels(0,0,grd_curscreen->sc_w,grd_curscreen->sc_h,GL_RGB,GL_UNSIGNED_BYTE,buf);
 702         write_bmp(savename,grd_curscreen->sc_w,grd_curscreen->sc_h,buf);
 703         d_free(buf);
 704
 705         key_flush();
 706         start_time();
 707 }