src/graphics/grgl1render.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 #include "pstypes.h"
  10 #include "2d.h"
  11 #include "gropengl.h"
  12 #include "grgl1.h"
  13 #include "gropenglinternal.h"
  14 #include "bmpman.h"
  15 #include "grinternal.h"
  16 #include "3d.h"
  17 #include "neb.h"
  18 #include "line.h"
  19 #include "palman.h"
  20
  21
  22 extern int OGL_fog_mode;
  23
  24 #define NEBULA_COLORS 20
  25
  26
  27 static void opengl1_rect_internal(int x, int y, int w, int h, int r, int g, int b, int a)
  28 {
  29         int saved_zbuf;
  30         vertex v[4];
  31         vertex *verts[4] = {&v[0], &v[1], &v[2], &v[3]};
  32
  33         saved_zbuf = gr_zbuffer_get();
  34
  35         // start the frame, no zbuffering, no culling
  36         g3_start_frame(1);
  37         gr_zbuffer_set(GR_ZBUFF_NONE);
  38         gr_set_cull(0);
  39
  40         // stuff coords
  41         v[0].sx = i2fl(x);
  42         v[0].sy = i2fl(y);
  43         v[0].sw = 0.0f;
  44         v[0].u = 0.0f;
  45         v[0].v = 0.0f;
  46         v[0].flags = PF_PROJECTED;
  47         v[0].codes = 0;
  48         v[0].r = (ubyte)r;
  49         v[0].g = (ubyte)g;
  50         v[0].b = (ubyte)b;
  51         v[0].a = (ubyte)a;
  52
  53         v[1].sx = i2fl(x + w);
  54         v[1].sy = i2fl(y);
  55         v[1].sw = 0.0f;
  56         v[1].u = 0.0f;
  57         v[1].v = 0.0f;
  58         v[1].flags = PF_PROJECTED;
  59         v[1].codes = 0;
  60         v[1].r = (ubyte)r;
  61         v[1].g = (ubyte)g;
  62         v[1].b = (ubyte)b;
  63         v[1].a = (ubyte)a;
  64
  65         v[2].sx = i2fl(x + w);
  66         v[2].sy = i2fl(y + h);
  67         v[2].sw = 0.0f;
  68         v[2].u = 0.0f;
  69         v[2].v = 0.0f;
  70         v[2].flags = PF_PROJECTED;
  71         v[2].codes = 0;
  72         v[2].r = (ubyte)r;
  73         v[2].g = (ubyte)g;
  74         v[2].b = (ubyte)b;
  75         v[2].a = (ubyte)a;
  76
  77         v[3].sx = i2fl(x);
  78         v[3].sy = i2fl(y + h);
  79         v[3].sw = 0.0f;
  80         v[3].u = 0.0f;
  81         v[3].v = 0.0f;
  82         v[3].flags = PF_PROJECTED;
  83         v[3].codes = 0;
  84         v[3].r = (ubyte)r;
  85         v[3].g = (ubyte)g;
  86         v[3].b = (ubyte)b;
  87         v[3].a = (ubyte)a;
  88
  89         // draw the polys
  90         g3_draw_poly_constant_sw(4, verts, TMAP_FLAG_GOURAUD | TMAP_FLAG_RGB | TMAP_FLAG_ALPHA, 0.1f);
  91
  92         g3_end_frame();
  93
  94         // restore zbuffer and culling
  95         gr_zbuffer_set(saved_zbuf);
  96         gr_set_cull(1);
  97 }
  98
  99 static void opengl1_aabitmap_ex_internal(int x,int y,int w,int h,int sx,int sy)
 100 {
 101         if ( (w < 1) || (h < 1) ) {
 102                 return;
 103         }
 104
 105         if ( !gr_screen.current_color.is_alphacolor ) {
 106                 return;
 107         }
 108
 109         float u_scale, v_scale;
 110
 111         if ( !opengl1_tcache_set(gr_screen.current_bitmap, TCACHE_TYPE_AABITMAP,
 112                         &u_scale, &v_scale, 0, -1, -1, 0) )
 113         {
 114                 // Couldn't set texture
 115                 mprintf(( "WARNING: Error setting aabitmap texture!\n" ));
 116                 return;
 117         }
 118
 119         opengl1_set_state( TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 120
 121         float u0, u1, v0, v1;
 122         float x1, x2, y1, y2;
 123         int bw, bh;
 124
 125         bm_get_info( gr_screen.current_bitmap, &bw, &bh );
 126
 127         u0 = u_scale*i2fl(sx)/i2fl(bw);
 128         v0 = v_scale*i2fl(sy)/i2fl(bh);
 129
 130         u1 = u_scale*i2fl(sx+w)/i2fl(bw);
 131         v1 = v_scale*i2fl(sy+h)/i2fl(bh);
 132
 133         x1 = i2fl(x+gr_screen.offset_x);
 134         y1 = i2fl(y+gr_screen.offset_y);
 135         x2 = i2fl(x+w+gr_screen.offset_x);
 136         y2 = i2fl(y+h+gr_screen.offset_y);
 137
 138         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 139                         gr_screen.current_color.blue,gr_screen.current_color.alpha);
 140
 141         opengl_alloc_render_buffer(4);
 142
 143         render_buffer[0].x = x1;
 144         render_buffer[0].y = y1;
 145         render_buffer[0].u = u0;
 146         render_buffer[0].v = v0;
 147
 148         render_buffer[1].x = x1;
 149         render_buffer[1].y = y2;
 150         render_buffer[1].u = u0;
 151         render_buffer[1].v = v1;
 152
 153         render_buffer[2].x = x2;
 154         render_buffer[2].y = y1;
 155         render_buffer[2].u = u1;
 156         render_buffer[2].v = v0;
 157
 158         render_buffer[3].x = x2;
 159         render_buffer[3].y = y2;
 160         render_buffer[3].u = u1;
 161         render_buffer[3].v = v1;
 162
 163         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 164         glEnableClientState(GL_VERTEX_ARRAY);
 165
 166         glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 167         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 168
 169         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 170
 171         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 172         glDisableClientState(GL_VERTEX_ARRAY);
 173 }
 174
 175 static void opengl1_stuff_fog_value(float z, float *f_val)
 176 {
 177         float f_float;
 178
 179         if ( !f_val ) {
 180                 return;
 181         }
 182
 183         f_float = 1.0f - ((gr_screen.fog_far - z) / (gr_screen.fog_far - gr_screen.fog_near));
 184
 185         if (f_float < 0.0f) {
 186                 f_float = 0.0f;
 187         } else if (f_float > 1.0f) {
 188                 f_float = 1.0f;
 189         }
 190
 191         *f_val = f_float;
 192 }
 193
 194 static void opengl1_tmapper_internal( int nv, vertex ** verts, uint flags, int is_scaler )
 195 {
 196         int i;
 197         float u_scale = 1.0f, v_scale = 1.0f;
 198
 199         gr_texture_source texture_source = (gr_texture_source)-1;
 200         gr_alpha_blend alpha_blend = (gr_alpha_blend)-1;
 201         gr_zbuffer_type zbuffer_type = (gr_zbuffer_type)-1;
 202
 203         if (Gr_zbuffering) {
 204                 if ( is_scaler || (gr_screen.current_alphablend_mode == GR_ALPHABLEND_FILTER) ) {
 205                         zbuffer_type = ZBUFFER_TYPE_READ;
 206                 } else {
 207                         zbuffer_type = ZBUFFER_TYPE_FULL;
 208                 }
 209         } else {
 210                 zbuffer_type = ZBUFFER_TYPE_NONE;
 211         }
 212
 213         int alpha;
 214
 215         int tmap_type = TCACHE_TYPE_NORMAL;
 216
 217         int r, g, b;
 218
 219         if ( flags & TMAP_FLAG_TEXTURED )       {
 220                 r = g = b = 255;
 221         } else {
 222                 r = gr_screen.current_color.red;
 223                 g = gr_screen.current_color.green;
 224                 b = gr_screen.current_color.blue;
 225         }
 226
 227         if (gr_screen.current_alphablend_mode == GR_ALPHABLEND_FILTER) {
 228                 tmap_type = TCACHE_TYPE_NORMAL;
 229                 alpha_blend = ALPHA_BLEND_ALPHA_ADDITIVE;
 230
 231                 // Blend with screen pixel using src*alpha+dst
 232
 233                 alpha = 255;
 234
 235                 if (gr_screen.current_alpha <= 1.0f)   {
 236                         r = fl2i((r * gr_screen.current_alpha) + 0.5f);
 237                         g = fl2i((g * gr_screen.current_alpha) + 0.5f);
 238                         b = fl2i((b * gr_screen.current_alpha) + 0.5f);
 239                 }
 240         } else {
 241                 alpha_blend = ALPHA_BLEND_ALPHA_BLEND_ALPHA;
 242                 alpha = 255;
 243         }
 244
 245         if (flags & TMAP_FLAG_BITMAP_SECTION) {
 246                 SDL_assert( !(flags & TMAP_FLAG_BITMAP_INTERFACE) );
 247                 tmap_type = TCACHE_TYPE_BITMAP_SECTION;
 248         } else if (flags & TMAP_FLAG_BITMAP_INTERFACE) {
 249                 SDL_assert( !(flags & TMAP_FLAG_BITMAP_SECTION) );
 250                 tmap_type = TCACHE_TYPE_BITMAP_INTERFACE;
 251         }
 252
 253         texture_source = TEXTURE_SOURCE_NONE;
 254
 255         if (flags & TMAP_FLAG_TEXTURED) {
 256                 if ( !opengl1_tcache_set(gr_screen.current_bitmap, tmap_type, &u_scale,
 257                                 &v_scale, 0, gr_screen.current_bitmap_sx, gr_screen.current_bitmap_sy, 0) )
 258                 {
 259                         mprintf(( "Not rendering a texture because it didn't fit in VRAM!\n" ));
 260                         return;
 261                 }
 262
 263                 // use non-filtered textures for bitmap sections and UI graphics
 264                 switch (tmap_type) {
 265                         case TCACHE_TYPE_BITMAP_INTERFACE:
 266                         case TCACHE_TYPE_BITMAP_SECTION:
 267                                 texture_source = TEXTURE_SOURCE_NO_FILTERING;
 268                                 break;
 269
 270                         default:
 271                                 texture_source = TEXTURE_SOURCE_DECAL;
 272                                 break;
 273                 }
 274         }
 275
 276
 277         opengl1_set_state( texture_source, alpha_blend, zbuffer_type );
 278
 279         float fr = 1.0f, fg = 1.0f, fb = 1.0f;
 280
 281         if (flags & TMAP_FLAG_PIXEL_FOG) {
 282                 int r, g, b;
 283                 int ra, ga, ba;
 284                 float sx, sy;
 285                 int x, y;
 286
 287                 ra = ga = ba = 0;
 288
 289                 /* argh */
 290                 for (i=nv-1;i>=0;i--)   // DDOI - change polygon winding
 291                 {
 292                         vertex * va = verts[i];
 293
 294                         x = fl2i(va->sx*16.0f);
 295                         y = fl2i(va->sy*16.0f);
 296
 297                         x += gr_screen.offset_x*16;
 298                         y += gr_screen.offset_y*16;
 299
 300                         sx = i2fl(x) / 16.0f;
 301                         sy = i2fl(y) / 16.0f;
 302
 303                         neb2_get_pixel((int)sx, (int)sy, &r, &g, &b);
 304
 305                         ra += r;
 306                         ga += g;
 307                         ba += b;
 308                 }
 309
 310                 ra /= nv;
 311                 ga /= nv;
 312                 ba /= nv;
 313
 314                 gr_fog_set(GR_FOGMODE_FOG, ra, ga, ba, -1.0f, -1.0f);
 315
 316                 fr = ra / 255.0f;
 317                 fg = ga / 255.0f;
 318                 fb = ba / 255.0f;
 319         }
 320
 321         opengl_alloc_render_buffer(nv);
 322
 323         int rb_offset = 0;
 324
 325         int x, y;
 326         float sx, sy, sz, rhw;
 327         int a;
 328
 329         for (i = nv-1; i >= 0; i--) {
 330                 vertex * va = verts[i];
 331
 332                 if ( Gr_zbuffering || (flags & TMAP_FLAG_NEBULA) ) {
 333                         sz = 1.0 - 1.0 / (1.0 + va->z / (32768.0 / 256.0));
 334
 335                         if ( sz > 0.98f ) {
 336                                 sz = 0.98f;
 337                         }
 338                 } else {
 339                         sz = 0.99f;
 340                 }
 341
 342                 if (flags & TMAP_FLAG_CORRECT) {
 343                         rhw = 1.0f / va->sw;
 344                 } else {
 345                         rhw = 1.0f;
 346                 }
 347
 348                 if (flags & TMAP_FLAG_ALPHA) {
 349                         a = verts[i]->a;
 350                 } else {
 351                         a = alpha;
 352                 }
 353
 354                 if (flags & TMAP_FLAG_NEBULA ) {
 355                         int pal = (verts[i]->b*(NEBULA_COLORS-1))/255;
 356                         r = gr_palette[pal*3+0];
 357                         g = gr_palette[pal*3+1];
 358                         b = gr_palette[pal*3+2];
 359                 } else if ( (flags & TMAP_FLAG_RAMP) && (flags & TMAP_FLAG_GOURAUD) )   {
 360                         r = Gr_gamma_lookup[verts[i]->b];
 361                         g = Gr_gamma_lookup[verts[i]->b];
 362                         b = Gr_gamma_lookup[verts[i]->b];
 363                 } else if ( (flags & TMAP_FLAG_RGB)  && (flags & TMAP_FLAG_GOURAUD) )   {
 364                         // Make 0.75 be 256.0f
 365                         r = Gr_gamma_lookup[verts[i]->r];
 366                         g = Gr_gamma_lookup[verts[i]->g];
 367                         b = Gr_gamma_lookup[verts[i]->b];
 368                 } else {
 369                         // use constant RGB values...
 370                 }
 371
 372                 render_buffer[rb_offset].r = r;
 373                 render_buffer[rb_offset].g = g;
 374                 render_buffer[rb_offset].b = b;
 375                 render_buffer[rb_offset].a = a;
 376
 377                 if ( (flags & TMAP_FLAG_PIXEL_FOG) && (OGL_fog_mode == 1) ) {
 378                         float f_val;
 379
 380                         opengl1_stuff_fog_value(va->z, &f_val);
 381
 382                         render_buffer[rb_offset].sr = fl2i(((fr * f_val) * 255.0f) + 0.5f);
 383                         render_buffer[rb_offset].sg = fl2i(((fg * f_val) * 255.0f) + 0.5f);
 384                         render_buffer[rb_offset].sb = fl2i(((fb * f_val) * 255.0f) + 0.5f);
 385                 }
 386
 387                 x = fl2i(va->sx*16.0f);
 388                 y = fl2i(va->sy*16.0f);
 389
 390                 x += gr_screen.offset_x*16;
 391                 y += gr_screen.offset_y*16;
 392
 393                 sx = i2fl(x) / 16.0f;
 394                 sy = i2fl(y) / 16.0f;
 395
 396                 if ( flags & TMAP_FLAG_TEXTURED )       {
 397                         render_buffer[rb_offset].u = va->u * u_scale;
 398                         render_buffer[rb_offset].v = va->v * v_scale;
 399                 }
 400
 401                 render_buffer[rb_offset].x = sx * rhw;
 402                 render_buffer[rb_offset].y = sy * rhw;
 403                 render_buffer[rb_offset].z = -sz * rhw;
 404                 render_buffer[rb_offset].w = rhw;
 405
 406                 ++rb_offset;
 407         }
 408
 409         if (flags & TMAP_FLAG_TEXTURED) {
 410                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 411                 glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 412         }
 413
 414         if ( (gr_screen.current_fog_mode != GR_FOGMODE_NONE) && (OGL_fog_mode == 1) ) {
 415                 glEnableClientState(GL_SECONDARY_COLOR_ARRAY);
 416                 vglSecondaryColorPointer(3, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].sr);
 417         }
 418
 419         glEnableClientState(GL_COLOR_ARRAY);
 420         glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].r);
 421
 422         glEnableClientState(GL_VERTEX_ARRAY);
 423         glVertexPointer(4, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 424
 425         glDrawArrays(GL_TRIANGLE_FAN, 0, rb_offset);
 426
 427         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 428         glDisableClientState(GL_SECONDARY_COLOR_ARRAY);
 429         glDisableClientState(GL_COLOR_ARRAY);
 430         glDisableClientState(GL_VERTEX_ARRAY);
 431 }
 432
 433 void gr_opengl1_rect(int x,int y,int w,int h)
 434 {
 435         opengl1_rect_internal(x, y, w, h, gr_screen.current_color.red,
 436                         gr_screen.current_color.green, gr_screen.current_color.blue,
 437                         gr_screen.current_color.alpha);
 438 }
 439
 440 void gr_opengl1_shade(int x,int y,int w,int h)
 441 {
 442         int r,g,b,a;
 443
 444         float shade1 = 1.0f;
 445         float shade2 = 6.0f;
 446
 447         r = fl2i(gr_screen.current_shader.r*255.0f*shade1);
 448         if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
 449         g = fl2i(gr_screen.current_shader.g*255.0f*shade1);
 450         if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
 451         b = fl2i(gr_screen.current_shader.b*255.0f*shade1);
 452         if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
 453         a = fl2i(gr_screen.current_shader.c*255.0f*shade2);
 454         if ( a < 0 ) a = 0; else if ( a > 255 ) a = 255;
 455
 456         opengl1_rect_internal(x, y, w, h, r, g, b, a);
 457 }
 458
 459 void gr_opengl1_aabitmap_ex(int x,int y,int w,int h,int sx,int sy)
 460 {
 461         int reclip;
 462         #ifndef NDEBUG
 463         int count = 0;
 464         #endif
 465
 466         int dx1=x, dx2=x+w-1;
 467         int dy1=y, dy2=y+h-1;
 468
 469         int bw, bh;
 470         bm_get_info( gr_screen.current_bitmap, &bw, &bh, NULL );
 471
 472         do {
 473                 reclip = 0;
 474                 #ifndef NDEBUG
 475                         if ( count > 1 ) Int3();
 476                         count++;
 477                 #endif
 478
 479                 if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
 480                 if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
 481                 if ( dx1 < gr_screen.clip_left ) { sx += gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
 482                 if ( dy1 < gr_screen.clip_top ) { sy += gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
 483                 if ( dx2 > gr_screen.clip_right )       { dx2 = gr_screen.clip_right; }
 484                 if ( dy2 > gr_screen.clip_bottom )      { dy2 = gr_screen.clip_bottom; }
 485
 486                 if ( sx < 0 ) {
 487                         dx1 -= sx;
 488                         sx = 0;
 489                         reclip = 1;
 490                 }
 491
 492                 if ( sy < 0 ) {
 493                         dy1 -= sy;
 494                         sy = 0;
 495                         reclip = 1;
 496                 }
 497
 498                 w = dx2-dx1+1;
 499                 h = dy2-dy1+1;
 500
 501                 if ( sx + w > bw ) {
 502                         w = bw - sx;
 503                         dx2 = dx1 + w - 1;
 504                 }
 505
 506                 if ( sy + h > bh ) {
 507                         h = bh - sy;
 508                         dy2 = dy1 + h - 1;
 509                 }
 510
 511                 if ( w < 1 ) return;            // clipped away!
 512                 if ( h < 1 ) return;            // clipped away!
 513
 514         } while (reclip);
 515
 516         // Make sure clipping algorithm works
 517         #ifndef NDEBUG
 518                 SDL_assert( w > 0 );
 519                 SDL_assert( h > 0 );
 520                 SDL_assert( w == (dx2-dx1+1) );
 521                 SDL_assert( h == (dy2-dy1+1) );
 522                 SDL_assert( sx >= 0 );
 523                 SDL_assert( sy >= 0 );
 524                 SDL_assert( sx+w <= bw );
 525                 SDL_assert( sy+h <= bh );
 526                 SDL_assert( dx2 >= dx1 );
 527                 SDL_assert( dy2 >= dy1 );
 528                 SDL_assert( (dx1 >= gr_screen.clip_left ) && (dx1 <= gr_screen.clip_right) );
 529                 SDL_assert( (dx2 >= gr_screen.clip_left ) && (dx2 <= gr_screen.clip_right) );
 530                 SDL_assert( (dy1 >= gr_screen.clip_top ) && (dy1 <= gr_screen.clip_bottom) );
 531                 SDL_assert( (dy2 >= gr_screen.clip_top ) && (dy2 <= gr_screen.clip_bottom) );
 532         #endif
 533
 534         // We now have dx1,dy1 and dx2,dy2 and sx, sy all set validly within clip regions.
 535         opengl1_aabitmap_ex_internal(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
 536 }
 537
 538 void gr_opengl1_aabitmap(int x, int y)
 539 {
 540         int w, h;
 541
 542         bm_get_info( gr_screen.current_bitmap, &w, &h, NULL );
 543         int dx1=x, dx2=x+w-1;
 544         int dy1=y, dy2=y+h-1;
 545         int sx=0, sy=0;
 546
 547         if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
 548         if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
 549         if ( dx1 < gr_screen.clip_left ) { sx = gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
 550         if ( dy1 < gr_screen.clip_top ) { sy = gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
 551         if ( dx2 > gr_screen.clip_right )       { dx2 = gr_screen.clip_right; }
 552         if ( dy2 > gr_screen.clip_bottom )      { dy2 = gr_screen.clip_bottom; }
 553
 554         if ( sx < 0 ) return;
 555         if ( sy < 0 ) return;
 556         if ( sx >= w ) return;
 557         if ( sy >= h ) return;
 558
 559         // Draw bitmap bm[sx,sy] into (dx1,dy1)-(dx2,dy2)
 560         gr_opengl1_aabitmap_ex(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
 561 }
 562
 563 void gr_opengl1_string( int sx, int sy, const char *s )
 564 {
 565         int width, spacing, letter;
 566         int x, y;
 567         int rb_offset;
 568         float u_scale, v_scale;
 569         float u0, u1, v0, v1;
 570         float x1, x2, y1, y2;
 571         int bw, bh;
 572         float fbw, fbh;
 573
 574         if ( !Current_font )    {
 575                 return;
 576         }
 577
 578         gr_set_bitmap(Current_font->bitmap_id, GR_ALPHABLEND_NONE, GR_BITBLT_MODE_NORMAL, 1.0f, -1, -1);
 579
 580         if ( !opengl1_tcache_set( gr_screen.current_bitmap, TCACHE_TYPE_AABITMAP, &u_scale, &v_scale, 0, -1, -1, 0 ) )  {
 581                 // Couldn't set texture
 582                 mprintf(( "WARNING: Error setting aabitmap texture!\n" ));
 583                 return;
 584         }
 585
 586         bm_get_info( gr_screen.current_bitmap, &bw, &bh );
 587
 588         fbw = 1.0f / i2fl(bw);
 589         fbh = 1.0f / i2fl(bh);
 590
 591         opengl1_set_state( TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 592
 593         // don't want to create a super huge buffer size (i.e. credits text)
 594         const int alocsize = 320;       // 80 characters max per render call
 595         opengl_alloc_render_buffer(alocsize);
 596
 597         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 598                         gr_screen.current_color.blue, gr_screen.current_color.alpha);
 599
 600         glEnableClientState(GL_VERTEX_ARRAY);
 601         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 602
 603         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 604         glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 605
 606         y = sy;
 607
 608         if (sx==0x8000) {                       //centered
 609                 x = get_centered_x(s);
 610         } else {
 611                 x = sx;
 612         }
 613
 614         spacing = 0;
 615         rb_offset = 0;
 616
 617         while (*s)      {
 618                 x += spacing;
 619
 620                 while (*s== '\n' )      {
 621                         s++;
 622                         y += Current_font->h;
 623                         if (sx==0x8000) {                       //centered
 624                                 x = get_centered_x(s);
 625                         } else {
 626                                 x = sx;
 627                         }
 628                 }
 629                 if (*s == 0 ) break;
 630
 631                 letter = get_char_width(s[0],s[1],&width,&spacing);
 632                 s++;
 633
 634                 //not in font, draw as space
 635                 if (letter<0)   {
 636                         continue;
 637                 }
 638
 639                 int xd, yd, xc, yc;
 640                 int wc, hc;
 641
 642                 // Check if this character is totally clipped
 643                 if ( x + width < gr_screen.clip_left ) continue;
 644                 if ( y + Current_font->h < gr_screen.clip_top ) continue;
 645                 if ( x > gr_screen.clip_right ) continue;
 646                 if ( y > gr_screen.clip_bottom ) continue;
 647
 648                 xd = yd = 0;
 649                 if ( x < gr_screen.clip_left ) xd = gr_screen.clip_left - x;
 650                 if ( y < gr_screen.clip_top ) yd = gr_screen.clip_top - y;
 651                 xc = x+xd;
 652                 yc = y+yd;
 653
 654                 wc = width - xd; hc = Current_font->h - yd;
 655                 if ( xc + wc > gr_screen.clip_right ) wc = gr_screen.clip_right - xc;
 656                 if ( yc + hc > gr_screen.clip_bottom ) hc = gr_screen.clip_bottom - yc;
 657
 658                 if ( wc < 1 ) continue;
 659                 if ( hc < 1 ) continue;
 660
 661                 float u = i2fl(Current_font->bm_u[letter] + xd);
 662                 float v = i2fl(Current_font->bm_v[letter] + yd);
 663
 664                 x1 = i2fl(xc + gr_screen.offset_x);
 665                 y1 = i2fl(yc + gr_screen.offset_y);
 666                 x2 = x1 + i2fl(wc);
 667                 y2 = y1 + i2fl(hc);
 668
 669                 u0 = u_scale * (u * fbw);
 670                 v0 = v_scale * (v * fbh);
 671
 672                 u1 = u_scale * ((u+i2fl(wc)) * fbw);
 673                 v1 = v_scale * ((v+i2fl(hc)) * fbh);
 674
 675                 // maybe go ahead and draw
 676                 if (rb_offset == alocsize) {
 677                         glDrawArrays(GL_TRIANGLE_STRIP, 0, rb_offset);
 678                         rb_offset = 0;
 679                 }
 680
 681                 render_buffer[rb_offset].x = x1;
 682                 render_buffer[rb_offset].y = y1;
 683                 render_buffer[rb_offset].u = u0;
 684                 render_buffer[rb_offset].v = v0;
 685                 ++rb_offset;
 686
 687                 render_buffer[rb_offset].x = x1;
 688                 render_buffer[rb_offset].y = y2;
 689                 render_buffer[rb_offset].u = u0;
 690                 render_buffer[rb_offset].v = v1;
 691                 ++rb_offset;
 692
 693                 render_buffer[rb_offset].x = x2;
 694                 render_buffer[rb_offset].y = y1;
 695                 render_buffer[rb_offset].u = u1;
 696                 render_buffer[rb_offset].v = v0;
 697                 ++rb_offset;
 698
 699                 render_buffer[rb_offset].x = x2;
 700                 render_buffer[rb_offset].y = y2;
 701                 render_buffer[rb_offset].u = u1;
 702                 render_buffer[rb_offset].v = v1;
 703                 ++rb_offset;
 704         }
 705
 706         if (rb_offset) {
 707                 glDrawArrays(GL_TRIANGLE_STRIP, 0, rb_offset);
 708         }
 709
 710         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 711         glDisableClientState(GL_VERTEX_ARRAY);
 712 }
 713
 714 void gr_opengl1_line(int x1,int y1,int x2,int y2)
 715 {
 716         opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 717
 718         INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,
 719                         gr_screen.clip_right,gr_screen.clip_bottom,return,void(),void());
 720
 721         float sx1, sy1;
 722         float sx2, sy2;
 723
 724         sx1 = i2fl(x1 + gr_screen.offset_x)+0.5;
 725         sy1 = i2fl(y1 + gr_screen.offset_y)+0.5;
 726         sx2 = i2fl(x2 + gr_screen.offset_x)+0.5;
 727         sy2 = i2fl(y2 + gr_screen.offset_y)+0.5;
 728
 729         opengl_alloc_render_buffer(2);
 730
 731         if ( x1 == x2 && y1 == y2 ) {
 732                 render_buffer[0].x = sx1;
 733                 render_buffer[0].y = sy1;
 734                 render_buffer[0].z = -0.99f;
 735
 736                 glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 737                                 gr_screen.current_color.blue, gr_screen.current_color.alpha);
 738
 739                 glEnableClientState(GL_VERTEX_ARRAY);
 740                 glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 741
 742                 glDrawArrays(GL_POINTS, 0, 1);
 743
 744                 glDisableClientState(GL_VERTEX_ARRAY);
 745
 746                 return;
 747         }
 748
 749         if ( x1 == x2 ) {
 750                 if ( sy1 < sy2 )    {
 751                         sy2 += 0.5f;
 752                 } else {
 753                         sy1 += 0.5f;
 754                 }
 755         } else if ( y1 == y2 )  {
 756                 if ( sx1 < sx2 )    {
 757                         sx2 += 0.5f;
 758                 } else {
 759                         sx1 += 0.5f;
 760                 }
 761         }
 762
 763         render_buffer[0].x = sx2;
 764         render_buffer[0].y = sy2;
 765         render_buffer[0].z = -0.99f;
 766
 767         render_buffer[1].x = sx1;
 768         render_buffer[1].y = sy1;
 769         render_buffer[1].z = -0.99f;
 770
 771         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 772                         gr_screen.current_color.blue, gr_screen.current_color.alpha);
 773
 774         glEnableClientState(GL_VERTEX_ARRAY);
 775         glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 776
 777         glDrawArrays(GL_LINES, 0, 2);
 778
 779         glDisableClientState(GL_VERTEX_ARRAY);
 780 }
 781
 782 void gr_opengl1_aaline(vertex *v1, vertex *v2)
 783 {
 784         gr_opengl1_line( fl2i(v1->sx), fl2i(v1->sy), fl2i(v2->sx), fl2i(v2->sy) );
 785 }
 786
 787 void gr_opengl1_gradient(int x1,int y1,int x2,int y2)
 788 {
 789         int swapped=0;
 790
 791         if ( !gr_screen.current_color.is_alphacolor )   {
 792                 gr_line( x1, y1, x2, y2 );
 793                 return;
 794         }
 795
 796         INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,
 797                         gr_screen.clip_right,gr_screen.clip_bottom,return,void(),swapped=1);
 798
 799         opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 800
 801         int aa = swapped ? 0 : gr_screen.current_color.alpha;
 802         int ba = swapped ? gr_screen.current_color.alpha : 0;
 803
 804         float sx1, sy1;
 805         float sx2, sy2;
 806
 807         sx1 = i2fl(x1 + gr_screen.offset_x)+0.5;
 808         sy1 = i2fl(y1 + gr_screen.offset_y)+0.5;
 809         sx2 = i2fl(x2 + gr_screen.offset_x)+0.5;
 810         sy2 = i2fl(y2 + gr_screen.offset_y)+0.5;
 811
 812         if ( x1 == x2 ) {
 813                 if ( sy1 < sy2 )    {
 814                         sy2 += 0.5f;
 815                 } else {
 816                         sy1 += 0.5f;
 817                 }
 818         } else if ( y1 == y2 )  {
 819                 if ( sx1 < sx2 )    {
 820                         sx2 += 0.5f;
 821                 } else {
 822                         sx1 += 0.5f;
 823                 }
 824         }
 825
 826         opengl_alloc_render_buffer(2);
 827
 828         render_buffer[0].r = gr_screen.current_color.red;
 829         render_buffer[0].g = gr_screen.current_color.green;
 830         render_buffer[0].b = gr_screen.current_color.blue;
 831         render_buffer[0].a = ba;
 832         render_buffer[0].x = sx2;
 833         render_buffer[0].y = sy2;
 834         render_buffer[0].z = -0.99f;
 835
 836         render_buffer[1].r = gr_screen.current_color.red;
 837         render_buffer[1].g = gr_screen.current_color.green;
 838         render_buffer[1].b = gr_screen.current_color.blue;
 839         render_buffer[1].a = aa;
 840         render_buffer[1].x = sx1;
 841         render_buffer[1].y = sy1;
 842         render_buffer[1].z = -0.99f;
 843
 844         glEnableClientState(GL_COLOR_ARRAY);
 845         glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].r);
 846
 847         glEnableClientState(GL_VERTEX_ARRAY);
 848         glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 849
 850         glDrawArrays(GL_LINES, 0, 2);
 851
 852         glDisableClientState(GL_COLOR_ARRAY);
 853         glDisableClientState(GL_VERTEX_ARRAY);
 854 }
 855
 856 void gr_opengl1_circle( int xc, int yc, int d )
 857 {
 858         int p,x, y, r;
 859
 860         r = d/2;
 861         p=3-d;
 862         x=0;
 863         y=r;
 864
 865         // Big clip
 866         if ( (xc+r) < gr_screen.clip_left ) return;
 867         if ( (xc-r) > gr_screen.clip_right ) return;
 868         if ( (yc+r) < gr_screen.clip_top ) return;
 869         if ( (yc-r) > gr_screen.clip_bottom ) return;
 870
 871         while(x<y)      {
 872                 // Draw the first octant
 873                 gr_opengl1_line( xc-y, yc-x, xc+y, yc-x );
 874                 gr_opengl1_line( xc-y, yc+x, xc+y, yc+x );
 875
 876                 if (p<0)
 877                         p=p+(x<<2)+6;
 878                 else    {
 879                         // Draw the second octant
 880                         gr_opengl1_line( xc-x, yc-y, xc+x, yc-y );
 881                         gr_opengl1_line( xc-x, yc+y, xc+x, yc+y );
 882
 883                         p=p+((x-y)<<2)+10;
 884                         y--;
 885                 }
 886                 x++;
 887         }
 888         if(x==y) {
 889                 gr_opengl1_line( xc-x, yc-y, xc+x, yc-y );
 890                 gr_opengl1_line( xc-x, yc+y, xc+x, yc+y );
 891         }
 892         return;
 893 }
 894
 895 void gr_opengl1_pixel(int x, int y)
 896 {
 897         gr_line(x,y,x,y);
 898 }
 899
 900
 901 // cross fade
 902 void gr_opengl1_cross_fade(int bmap1, int bmap2, int x1, int y1, int x2, int y2, float pct)
 903 {
 904         gr_set_bitmap(bmap1, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, 1.0f - pct );
 905         gr_bitmap(x1, y1);
 906
 907         gr_set_bitmap(bmap2, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, pct );
 908         gr_bitmap(x2, y2);
 909 }
 910
 911 void gr_opengl1_flash(int r, int g, int b)
 912 {
 913         CAP(r,0,255);
 914         CAP(g,0,255);
 915         CAP(b,0,255);
 916
 917         if ( r || g || b ) {
 918                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_ADDITIVE, ZBUFFER_TYPE_NONE );
 919
 920                 float x1, x2, y1, y2;
 921                 x1 = i2fl(gr_screen.clip_left+gr_screen.offset_x);
 922                 y1 = i2fl(gr_screen.clip_top+gr_screen.offset_y);
 923                 x2 = i2fl(gr_screen.clip_right+gr_screen.offset_x);
 924                 y2 = i2fl(gr_screen.clip_bottom+gr_screen.offset_y);
 925
 926                 glColor4ub(r, g, b, 255);
 927
 928                 opengl_alloc_render_buffer(4);
 929
 930                 render_buffer[0].x = x1;
 931                 render_buffer[0].y = y1;
 932                 render_buffer[0].z = -0.99f;
 933
 934                 render_buffer[1].x = x1;
 935                 render_buffer[1].y = y2;
 936                 render_buffer[1].z = -0.99f;
 937
 938                 render_buffer[2].x = x2;
 939                 render_buffer[2].y = y1;
 940                 render_buffer[2].z = -0.99f;
 941
 942                 render_buffer[3].x = x2;
 943                 render_buffer[3].y = y2;
 944                 render_buffer[3].z = -0.99f;
 945
 946                 glEnableClientState(GL_VERTEX_ARRAY);
 947                 glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 948
 949                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 950
 951                 glDisableClientState(GL_VERTEX_ARRAY);
 952         }
 953 }
 954
 955 void gr_opengl1_tmapper( int nverts, vertex **verts, uint flags )
 956 {
 957         opengl1_tmapper_internal( nverts, verts, flags, 0 );
 958 }
 959
 960 #define FIND_SCALED_NUM(x,x0,x1,y0,y1) (((((x)-(x0))*((y1)-(y0)))/((x1)-(x0)))+(y0))
 961
 962 void gr_opengl1_scaler(vertex *va, vertex *vb )
 963 {
 964         float x0, y0, x1, y1;
 965         float u0, v0, u1, v1;
 966         float clipped_x0, clipped_y0, clipped_x1, clipped_y1;
 967         float clipped_u0, clipped_v0, clipped_u1, clipped_v1;
 968         float xmin, xmax, ymin, ymax;
 969         int dx0, dy0, dx1, dy1;
 970
 971         //============= CLIP IT =====================
 972
 973         x0 = va->sx; y0 = va->sy;
 974         x1 = vb->sx; y1 = vb->sy;
 975
 976         xmin = i2fl(gr_screen.clip_left); ymin = i2fl(gr_screen.clip_top);
 977         xmax = i2fl(gr_screen.clip_right); ymax = i2fl(gr_screen.clip_bottom);
 978
 979         u0 = va->u; v0 = va->v;
 980         u1 = vb->u; v1 = vb->v;
 981
 982         // Check for obviously offscreen bitmaps...
 983         if ( (y1<=y0) || (x1<=x0) ) return;
 984         if ( (x1<xmin ) || (x0>xmax) ) return;
 985         if ( (y1<ymin ) || (y0>ymax) ) return;
 986
 987         clipped_u0 = u0; clipped_v0 = v0;
 988         clipped_u1 = u1; clipped_v1 = v1;
 989
 990         clipped_x0 = x0; clipped_y0 = y0;
 991         clipped_x1 = x1; clipped_y1 = y1;
 992
 993         // Clip the left, moving u0 right as necessary
 994         if ( x0 < xmin )        {
 995                 clipped_u0 = FIND_SCALED_NUM(xmin,x0,x1,u0,u1);
 996                 clipped_x0 = xmin;
 997         }
 998
 999         // Clip the right, moving u1 left as necessary
1000         if ( x1 > xmax )        {
1001                 clipped_u1 = FIND_SCALED_NUM(xmax,x0,x1,u0,u1);
1002                 clipped_x1 = xmax;
1003         }
1004
1005         // Clip the top, moving v0 down as necessary
1006         if ( y0 < ymin )        {
1007                 clipped_v0 = FIND_SCALED_NUM(ymin,y0,y1,v0,v1);
1008                 clipped_y0 = ymin;
1009         }
1010
1011         // Clip the bottom, moving v1 up as necessary
1012         if ( y1 > ymax )        {
1013                 clipped_v1 = FIND_SCALED_NUM(ymax,y0,y1,v0,v1);
1014                 clipped_y1 = ymax;
1015         }
1016
1017         dx0 = fl2i(clipped_x0); dx1 = fl2i(clipped_x1);
1018         dy0 = fl2i(clipped_y0); dy1 = fl2i(clipped_y1);
1019
1020         if (dx1<=dx0) return;
1021         if (dy1<=dy0) return;
1022
1023         //============= DRAW IT =====================
1024
1025         vertex v[4];
1026         vertex *vl[4];
1027
1028         vl[0] = &v[0];
1029         v[0].sx = clipped_x0;
1030         v[0].sy = clipped_y0;
1031         v[0].sw = va->sw;
1032         v[0].z = va->z;
1033         v[0].u = clipped_u0;
1034         v[0].v = clipped_v0;
1035
1036         vl[1] = &v[1];
1037         v[1].sx = clipped_x1;
1038         v[1].sy = clipped_y0;
1039         v[1].sw = va->sw;
1040         v[1].z = va->z;
1041         v[1].u = clipped_u1;
1042         v[1].v = clipped_v0;
1043
1044         vl[2] = &v[2];
1045         v[2].sx = clipped_x1;
1046         v[2].sy = clipped_y1;
1047         v[2].sw = va->sw;
1048         v[2].z = va->z;
1049         v[2].u = clipped_u1;
1050         v[2].v = clipped_v1;
1051
1052         vl[3] = &v[3];
1053         v[3].sx = clipped_x0;
1054         v[3].sy = clipped_y1;
1055         v[3].sw = va->sw;
1056         v[3].z = va->z;
1057         v[3].u = clipped_u0;
1058         v[3].v = clipped_v1;
1059
1060         opengl1_tmapper_internal( 4, vl, TMAP_FLAG_TEXTURED, 1 );
1061 }