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         // Make nebula use the texture mapper... this blends the colors better.
 200         if ( flags & TMAP_FLAG_NEBULA ){
 201                 Int3 ();
 202         }
 203
 204         gr_texture_source texture_source = (gr_texture_source)-1;
 205         gr_alpha_blend alpha_blend = (gr_alpha_blend)-1;
 206         gr_zbuffer_type zbuffer_type = (gr_zbuffer_type)-1;
 207
 208         if (Gr_zbuffering) {
 209                 if ( is_scaler || (gr_screen.current_alphablend_mode == GR_ALPHABLEND_FILTER) ) {
 210                         zbuffer_type = ZBUFFER_TYPE_READ;
 211                 } else {
 212                         zbuffer_type = ZBUFFER_TYPE_FULL;
 213                 }
 214         } else {
 215                 zbuffer_type = ZBUFFER_TYPE_NONE;
 216         }
 217
 218         int alpha;
 219
 220         int tmap_type = TCACHE_TYPE_NORMAL;
 221
 222         int r, g, b;
 223
 224         if ( flags & TMAP_FLAG_TEXTURED )       {
 225                 r = g = b = 255;
 226         } else {
 227                 r = gr_screen.current_color.red;
 228                 g = gr_screen.current_color.green;
 229                 b = gr_screen.current_color.blue;
 230         }
 231
 232         if (gr_screen.current_alphablend_mode == GR_ALPHABLEND_FILTER) {
 233                 tmap_type = TCACHE_TYPE_NORMAL;
 234                 alpha_blend = ALPHA_BLEND_ALPHA_ADDITIVE;
 235
 236                 // Blend with screen pixel using src*alpha+dst
 237
 238                 alpha = 255;
 239
 240                 if (gr_screen.current_alpha <= 1.0f)   {
 241                         r = fl2i((r * gr_screen.current_alpha) + 0.5f);
 242                         g = fl2i((g * gr_screen.current_alpha) + 0.5f);
 243                         b = fl2i((b * gr_screen.current_alpha) + 0.5f);
 244                 }
 245         } else {
 246                 alpha_blend = ALPHA_BLEND_ALPHA_BLEND_ALPHA;
 247                 alpha = 255;
 248         }
 249
 250         if (flags & TMAP_FLAG_BITMAP_SECTION) {
 251                 SDL_assert( !(flags & TMAP_FLAG_BITMAP_INTERFACE) );
 252                 tmap_type = TCACHE_TYPE_BITMAP_SECTION;
 253         } else if (flags & TMAP_FLAG_BITMAP_INTERFACE) {
 254                 SDL_assert( !(flags & TMAP_FLAG_BITMAP_SECTION) );
 255                 tmap_type = TCACHE_TYPE_BITMAP_INTERFACE;
 256         }
 257
 258         texture_source = TEXTURE_SOURCE_NONE;
 259
 260         if (flags & TMAP_FLAG_TEXTURED) {
 261                 if ( !opengl1_tcache_set(gr_screen.current_bitmap, tmap_type, &u_scale,
 262                                 &v_scale, 0, gr_screen.current_bitmap_sx, gr_screen.current_bitmap_sy, 0) )
 263                 {
 264                         mprintf(( "Not rendering a texture because it didn't fit in VRAM!\n" ));
 265                         return;
 266                 }
 267
 268                 // use non-filtered textures for bitmap sections and UI graphics
 269                 switch (tmap_type) {
 270                         case TCACHE_TYPE_BITMAP_INTERFACE:
 271                         case TCACHE_TYPE_BITMAP_SECTION:
 272                                 texture_source = TEXTURE_SOURCE_NO_FILTERING;
 273                                 break;
 274
 275                         default:
 276                                 texture_source = TEXTURE_SOURCE_DECAL;
 277                                 break;
 278                 }
 279         }
 280
 281
 282         opengl1_set_state( texture_source, alpha_blend, zbuffer_type );
 283
 284         float fr = 1.0f, fg = 1.0f, fb = 1.0f;
 285
 286         if (flags & TMAP_FLAG_PIXEL_FOG) {
 287                 int r, g, b;
 288                 int ra, ga, ba;
 289                 float sx, sy;
 290                 int x, y;
 291
 292                 ra = ga = ba = 0;
 293
 294                 /* argh */
 295                 for (i=nv-1;i>=0;i--)   // DDOI - change polygon winding
 296                 {
 297                         vertex * va = verts[i];
 298
 299                         x = fl2i(va->sx*16.0f);
 300                         y = fl2i(va->sy*16.0f);
 301
 302                         x += gr_screen.offset_x*16;
 303                         y += gr_screen.offset_y*16;
 304
 305                         sx = i2fl(x) / 16.0f;
 306                         sy = i2fl(y) / 16.0f;
 307
 308                         neb2_get_pixel((int)sx, (int)sy, &r, &g, &b);
 309
 310                         ra += r;
 311                         ga += g;
 312                         ba += b;
 313                 }
 314
 315                 ra /= nv;
 316                 ga /= nv;
 317                 ba /= nv;
 318
 319                 gr_fog_set(GR_FOGMODE_FOG, ra, ga, ba, -1.0f, -1.0f);
 320
 321                 fr = ra / 255.0f;
 322                 fg = ga / 255.0f;
 323                 fb = ba / 255.0f;
 324         }
 325
 326         opengl_alloc_render_buffer(nv);
 327
 328         int rb_offset = 0;
 329
 330         int x, y;
 331         float sx, sy, sz, rhw;
 332         int a;
 333
 334         for (i = nv-1; i >= 0; i--) {
 335                 vertex * va = verts[i];
 336
 337                 if ( Gr_zbuffering || (flags & TMAP_FLAG_NEBULA) ) {
 338                         sz = 1.0 - 1.0 / (1.0 + va->z / (32768.0 / 256.0));
 339
 340                         if ( sz > 0.98f ) {
 341                                 sz = 0.98f;
 342                         }
 343                 } else {
 344                         sz = 0.99f;
 345                 }
 346
 347                 if (flags & TMAP_FLAG_CORRECT) {
 348                         rhw = 1.0f / va->sw;
 349                 } else {
 350                         rhw = 1.0f;
 351                 }
 352
 353                 if (flags & TMAP_FLAG_ALPHA) {
 354                         a = verts[i]->a;
 355                 } else {
 356                         a = alpha;
 357                 }
 358
 359                 if (flags & TMAP_FLAG_NEBULA ) {
 360                         int pal = (verts[i]->b*(NEBULA_COLORS-1))/255;
 361                         r = gr_palette[pal*3+0];
 362                         g = gr_palette[pal*3+1];
 363                         b = gr_palette[pal*3+2];
 364                 } else if ( (flags & TMAP_FLAG_RAMP) && (flags & TMAP_FLAG_GOURAUD) )   {
 365                         r = Gr_gamma_lookup[verts[i]->b];
 366                         g = Gr_gamma_lookup[verts[i]->b];
 367                         b = Gr_gamma_lookup[verts[i]->b];
 368                 } else if ( (flags & TMAP_FLAG_RGB)  && (flags & TMAP_FLAG_GOURAUD) )   {
 369                         // Make 0.75 be 256.0f
 370                         r = Gr_gamma_lookup[verts[i]->r];
 371                         g = Gr_gamma_lookup[verts[i]->g];
 372                         b = Gr_gamma_lookup[verts[i]->b];
 373                 } else {
 374                         // use constant RGB values...
 375                 }
 376
 377                 render_buffer[rb_offset].r = r;
 378                 render_buffer[rb_offset].g = g;
 379                 render_buffer[rb_offset].b = b;
 380                 render_buffer[rb_offset].a = a;
 381
 382                 if ( (flags & TMAP_FLAG_PIXEL_FOG) && (OGL_fog_mode == 1) ) {
 383                         float f_val;
 384
 385                         opengl1_stuff_fog_value(va->z, &f_val);
 386
 387                         render_buffer[rb_offset].sr = fl2i(((fr * f_val) * 255.0f) + 0.5f);
 388                         render_buffer[rb_offset].sg = fl2i(((fg * f_val) * 255.0f) + 0.5f);
 389                         render_buffer[rb_offset].sb = fl2i(((fb * f_val) * 255.0f) + 0.5f);
 390                 }
 391
 392                 x = fl2i(va->sx*16.0f);
 393                 y = fl2i(va->sy*16.0f);
 394
 395                 x += gr_screen.offset_x*16;
 396                 y += gr_screen.offset_y*16;
 397
 398                 sx = i2fl(x) / 16.0f;
 399                 sy = i2fl(y) / 16.0f;
 400
 401                 if ( flags & TMAP_FLAG_TEXTURED )       {
 402                         render_buffer[rb_offset].u = va->u * u_scale;
 403                         render_buffer[rb_offset].v = va->v * v_scale;
 404                 }
 405
 406                 render_buffer[rb_offset].x = sx * rhw;
 407                 render_buffer[rb_offset].y = sy * rhw;
 408                 render_buffer[rb_offset].z = -sz * rhw;
 409                 render_buffer[rb_offset].w = rhw;
 410
 411                 ++rb_offset;
 412         }
 413
 414         if (flags & TMAP_FLAG_TEXTURED) {
 415                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 416                 glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 417         }
 418
 419         if ( (gr_screen.current_fog_mode != GR_FOGMODE_NONE) && (OGL_fog_mode == 1) ) {
 420                 glEnableClientState(GL_SECONDARY_COLOR_ARRAY);
 421                 vglSecondaryColorPointer(3, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].sr);
 422         }
 423
 424         glEnableClientState(GL_COLOR_ARRAY);
 425         glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].r);
 426
 427         glEnableClientState(GL_VERTEX_ARRAY);
 428         glVertexPointer(4, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 429
 430         glDrawArrays(GL_TRIANGLE_FAN, 0, rb_offset);
 431
 432         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 433         glDisableClientState(GL_SECONDARY_COLOR_ARRAY);
 434         glDisableClientState(GL_COLOR_ARRAY);
 435         glDisableClientState(GL_VERTEX_ARRAY);
 436 }
 437
 438 void gr_opengl1_rect(int x,int y,int w,int h)
 439 {
 440         opengl1_rect_internal(x, y, w, h, gr_screen.current_color.red,
 441                         gr_screen.current_color.green, gr_screen.current_color.blue,
 442                         gr_screen.current_color.alpha);
 443 }
 444
 445 void gr_opengl1_shade(int x,int y,int w,int h)
 446 {
 447         int r,g,b,a;
 448
 449         float shade1 = 1.0f;
 450         float shade2 = 6.0f;
 451
 452         r = fl2i(gr_screen.current_shader.r*255.0f*shade1);
 453         if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
 454         g = fl2i(gr_screen.current_shader.g*255.0f*shade1);
 455         if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
 456         b = fl2i(gr_screen.current_shader.b*255.0f*shade1);
 457         if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
 458         a = fl2i(gr_screen.current_shader.c*255.0f*shade2);
 459         if ( a < 0 ) a = 0; else if ( a > 255 ) a = 255;
 460
 461         opengl1_rect_internal(x, y, w, h, r, g, b, a);
 462 }
 463
 464 void gr_opengl1_aabitmap_ex(int x,int y,int w,int h,int sx,int sy)
 465 {
 466         int reclip;
 467         #ifndef NDEBUG
 468         int count = 0;
 469         #endif
 470
 471         int dx1=x, dx2=x+w-1;
 472         int dy1=y, dy2=y+h-1;
 473
 474         int bw, bh;
 475         bm_get_info( gr_screen.current_bitmap, &bw, &bh, NULL );
 476
 477         do {
 478                 reclip = 0;
 479                 #ifndef NDEBUG
 480                         if ( count > 1 ) Int3();
 481                         count++;
 482                 #endif
 483
 484                 if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
 485                 if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
 486                 if ( dx1 < gr_screen.clip_left ) { sx += gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
 487                 if ( dy1 < gr_screen.clip_top ) { sy += gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
 488                 if ( dx2 > gr_screen.clip_right )       { dx2 = gr_screen.clip_right; }
 489                 if ( dy2 > gr_screen.clip_bottom )      { dy2 = gr_screen.clip_bottom; }
 490
 491                 if ( sx < 0 ) {
 492                         dx1 -= sx;
 493                         sx = 0;
 494                         reclip = 1;
 495                 }
 496
 497                 if ( sy < 0 ) {
 498                         dy1 -= sy;
 499                         sy = 0;
 500                         reclip = 1;
 501                 }
 502
 503                 w = dx2-dx1+1;
 504                 h = dy2-dy1+1;
 505
 506                 if ( sx + w > bw ) {
 507                         w = bw - sx;
 508                         dx2 = dx1 + w - 1;
 509                 }
 510
 511                 if ( sy + h > bh ) {
 512                         h = bh - sy;
 513                         dy2 = dy1 + h - 1;
 514                 }
 515
 516                 if ( w < 1 ) return;            // clipped away!
 517                 if ( h < 1 ) return;            // clipped away!
 518
 519         } while (reclip);
 520
 521         // Make sure clipping algorithm works
 522         #ifndef NDEBUG
 523                 SDL_assert( w > 0 );
 524                 SDL_assert( h > 0 );
 525                 SDL_assert( w == (dx2-dx1+1) );
 526                 SDL_assert( h == (dy2-dy1+1) );
 527                 SDL_assert( sx >= 0 );
 528                 SDL_assert( sy >= 0 );
 529                 SDL_assert( sx+w <= bw );
 530                 SDL_assert( sy+h <= bh );
 531                 SDL_assert( dx2 >= dx1 );
 532                 SDL_assert( dy2 >= dy1 );
 533                 SDL_assert( (dx1 >= gr_screen.clip_left ) && (dx1 <= gr_screen.clip_right) );
 534                 SDL_assert( (dx2 >= gr_screen.clip_left ) && (dx2 <= gr_screen.clip_right) );
 535                 SDL_assert( (dy1 >= gr_screen.clip_top ) && (dy1 <= gr_screen.clip_bottom) );
 536                 SDL_assert( (dy2 >= gr_screen.clip_top ) && (dy2 <= gr_screen.clip_bottom) );
 537         #endif
 538
 539         // We now have dx1,dy1 and dx2,dy2 and sx, sy all set validly within clip regions.
 540         opengl1_aabitmap_ex_internal(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
 541 }
 542
 543 void gr_opengl1_aabitmap(int x, int y)
 544 {
 545         int w, h;
 546
 547         bm_get_info( gr_screen.current_bitmap, &w, &h, NULL );
 548         int dx1=x, dx2=x+w-1;
 549         int dy1=y, dy2=y+h-1;
 550         int sx=0, sy=0;
 551
 552         if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
 553         if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
 554         if ( dx1 < gr_screen.clip_left ) { sx = gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
 555         if ( dy1 < gr_screen.clip_top ) { sy = gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
 556         if ( dx2 > gr_screen.clip_right )       { dx2 = gr_screen.clip_right; }
 557         if ( dy2 > gr_screen.clip_bottom )      { dy2 = gr_screen.clip_bottom; }
 558
 559         if ( sx < 0 ) return;
 560         if ( sy < 0 ) return;
 561         if ( sx >= w ) return;
 562         if ( sy >= h ) return;
 563
 564         // Draw bitmap bm[sx,sy] into (dx1,dy1)-(dx2,dy2)
 565         gr_opengl1_aabitmap_ex(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
 566 }
 567
 568 void gr_opengl1_string( int sx, int sy, const char *s )
 569 {
 570         int width, spacing, letter;
 571         int x, y;
 572         int rb_offset;
 573         float u_scale, v_scale;
 574         float u0, u1, v0, v1;
 575         float x1, x2, y1, y2;
 576         int bw, bh;
 577         float fbw, fbh;
 578
 579         if ( !Current_font )    {
 580                 return;
 581         }
 582
 583         gr_set_bitmap(Current_font->bitmap_id, GR_ALPHABLEND_NONE, GR_BITBLT_MODE_NORMAL, 1.0f, -1, -1);
 584
 585         if ( !opengl1_tcache_set( gr_screen.current_bitmap, TCACHE_TYPE_AABITMAP, &u_scale, &v_scale, 0, -1, -1, 0 ) )  {
 586                 // Couldn't set texture
 587                 mprintf(( "WARNING: Error setting aabitmap texture!\n" ));
 588                 return;
 589         }
 590
 591         bm_get_info( gr_screen.current_bitmap, &bw, &bh );
 592
 593         fbw = 1.0f / i2fl(bw);
 594         fbh = 1.0f / i2fl(bh);
 595
 596         opengl1_set_state( TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 597
 598         // don't want to create a super huge buffer size (i.e. credits text)
 599         const int alocsize = 320;       // 80 characters max per render call
 600         opengl_alloc_render_buffer(alocsize);
 601
 602         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 603                         gr_screen.current_color.blue, gr_screen.current_color.alpha);
 604
 605         glEnableClientState(GL_VERTEX_ARRAY);
 606         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 607
 608         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 609         glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 610
 611         x = sx;
 612         y = sy;
 613
 614         if (sx==0x8000) {                       //centered
 615                 x = get_centered_x(s);
 616         } else {
 617                 x = sx;
 618         }
 619
 620         spacing = 0;
 621         rb_offset = 0;
 622
 623         while (*s)      {
 624                 x += spacing;
 625
 626                 while (*s== '\n' )      {
 627                         s++;
 628                         y += Current_font->h;
 629                         if (sx==0x8000) {                       //centered
 630                                 x = get_centered_x(s);
 631                         } else {
 632                                 x = sx;
 633                         }
 634                 }
 635                 if (*s == 0 ) break;
 636
 637                 letter = get_char_width(s[0],s[1],&width,&spacing);
 638                 s++;
 639
 640                 //not in font, draw as space
 641                 if (letter<0)   {
 642                         continue;
 643                 }
 644
 645                 int xd, yd, xc, yc;
 646                 int wc, hc;
 647
 648                 // Check if this character is totally clipped
 649                 if ( x + width < gr_screen.clip_left ) continue;
 650                 if ( y + Current_font->h < gr_screen.clip_top ) continue;
 651                 if ( x > gr_screen.clip_right ) continue;
 652                 if ( y > gr_screen.clip_bottom ) continue;
 653
 654                 xd = yd = 0;
 655                 if ( x < gr_screen.clip_left ) xd = gr_screen.clip_left - x;
 656                 if ( y < gr_screen.clip_top ) yd = gr_screen.clip_top - y;
 657                 xc = x+xd;
 658                 yc = y+yd;
 659
 660                 wc = width - xd; hc = Current_font->h - yd;
 661                 if ( xc + wc > gr_screen.clip_right ) wc = gr_screen.clip_right - xc;
 662                 if ( yc + hc > gr_screen.clip_bottom ) hc = gr_screen.clip_bottom - yc;
 663
 664                 if ( wc < 1 ) continue;
 665                 if ( hc < 1 ) continue;
 666
 667                 float u = i2fl(Current_font->bm_u[letter] + xd);
 668                 float v = i2fl(Current_font->bm_v[letter] + yd);
 669
 670                 x1 = i2fl(xc + gr_screen.offset_x);
 671                 y1 = i2fl(yc + gr_screen.offset_y);
 672                 x2 = x1 + i2fl(wc);
 673                 y2 = y1 + i2fl(hc);
 674
 675                 u0 = u_scale * (u * fbw);
 676                 v0 = v_scale * (v * fbh);
 677
 678                 u1 = u_scale * ((u+i2fl(wc)) * fbw);
 679                 v1 = v_scale * ((v+i2fl(hc)) * fbh);
 680
 681                 // maybe go ahead and draw
 682                 if (rb_offset == alocsize) {
 683                         glDrawArrays(GL_TRIANGLE_STRIP, 0, rb_offset);
 684                         rb_offset = 0;
 685                 }
 686
 687                 render_buffer[rb_offset].x = x1;
 688                 render_buffer[rb_offset].y = y1;
 689                 render_buffer[rb_offset].u = u0;
 690                 render_buffer[rb_offset].v = v0;
 691                 ++rb_offset;
 692
 693                 render_buffer[rb_offset].x = x1;
 694                 render_buffer[rb_offset].y = y2;
 695                 render_buffer[rb_offset].u = u0;
 696                 render_buffer[rb_offset].v = v1;
 697                 ++rb_offset;
 698
 699                 render_buffer[rb_offset].x = x2;
 700                 render_buffer[rb_offset].y = y1;
 701                 render_buffer[rb_offset].u = u1;
 702                 render_buffer[rb_offset].v = v0;
 703                 ++rb_offset;
 704
 705                 render_buffer[rb_offset].x = x2;
 706                 render_buffer[rb_offset].y = y2;
 707                 render_buffer[rb_offset].u = u1;
 708                 render_buffer[rb_offset].v = v1;
 709                 ++rb_offset;
 710         }
 711
 712         if (rb_offset) {
 713                 glDrawArrays(GL_TRIANGLE_STRIP, 0, rb_offset);
 714         }
 715
 716         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 717         glDisableClientState(GL_VERTEX_ARRAY);
 718 }
 719
 720 void gr_opengl1_line(int x1,int y1,int x2,int y2)
 721 {
 722         opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 723
 724         INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,
 725                         gr_screen.clip_right,gr_screen.clip_bottom,return,void(),void());
 726
 727         float sx1, sy1;
 728         float sx2, sy2;
 729
 730         sx1 = i2fl(x1 + gr_screen.offset_x)+0.5;
 731         sy1 = i2fl(y1 + gr_screen.offset_y)+0.5;
 732         sx2 = i2fl(x2 + gr_screen.offset_x)+0.5;
 733         sy2 = i2fl(y2 + gr_screen.offset_y)+0.5;
 734
 735         opengl_alloc_render_buffer(2);
 736
 737         if ( x1 == x2 && y1 == y2 ) {
 738                 render_buffer[0].x = sx1;
 739                 render_buffer[0].y = sy1;
 740                 render_buffer[0].z = -0.99f;
 741
 742                 glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 743                                 gr_screen.current_color.blue, gr_screen.current_color.alpha);
 744
 745                 glEnableClientState(GL_VERTEX_ARRAY);
 746                 glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 747
 748                 glDrawArrays(GL_POINTS, 0, 1);
 749
 750                 glDisableClientState(GL_VERTEX_ARRAY);
 751
 752                 return;
 753         }
 754
 755         if ( x1 == x2 ) {
 756                 if ( sy1 < sy2 )    {
 757                         sy2 += 0.5f;
 758                 } else {
 759                         sy1 += 0.5f;
 760                 }
 761         } else if ( y1 == y2 )  {
 762                 if ( sx1 < sx2 )    {
 763                         sx2 += 0.5f;
 764                 } else {
 765                         sx1 += 0.5f;
 766                 }
 767         }
 768
 769         render_buffer[0].x = sx2;
 770         render_buffer[0].y = sy2;
 771         render_buffer[0].z = -0.99f;
 772
 773         render_buffer[1].x = sx1;
 774         render_buffer[1].y = sy1;
 775         render_buffer[1].z = -0.99f;
 776
 777         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 778                         gr_screen.current_color.blue, gr_screen.current_color.alpha);
 779
 780         glEnableClientState(GL_VERTEX_ARRAY);
 781         glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 782
 783         glDrawArrays(GL_LINES, 0, 2);
 784
 785         glDisableClientState(GL_VERTEX_ARRAY);
 786 }
 787
 788 void gr_opengl1_aaline(vertex *v1, vertex *v2)
 789 {
 790         gr_opengl1_line( fl2i(v1->sx), fl2i(v1->sy), fl2i(v2->sx), fl2i(v2->sy) );
 791 }
 792
 793 void gr_opengl1_gradient(int x1,int y1,int x2,int y2)
 794 {
 795         int swapped=0;
 796
 797         if ( !gr_screen.current_color.is_alphacolor )   {
 798                 gr_line( x1, y1, x2, y2 );
 799                 return;
 800         }
 801
 802         INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,
 803                         gr_screen.clip_right,gr_screen.clip_bottom,return,void(),swapped=1);
 804
 805         opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 806
 807         int aa = swapped ? 0 : gr_screen.current_color.alpha;
 808         int ba = swapped ? gr_screen.current_color.alpha : 0;
 809
 810         float sx1, sy1;
 811         float sx2, sy2;
 812
 813         sx1 = i2fl(x1 + gr_screen.offset_x)+0.5;
 814         sy1 = i2fl(y1 + gr_screen.offset_y)+0.5;
 815         sx2 = i2fl(x2 + gr_screen.offset_x)+0.5;
 816         sy2 = i2fl(y2 + gr_screen.offset_y)+0.5;
 817
 818         if ( x1 == x2 ) {
 819                 if ( sy1 < sy2 )    {
 820                         sy2 += 0.5f;
 821                 } else {
 822                         sy1 += 0.5f;
 823                 }
 824         } else if ( y1 == y2 )  {
 825                 if ( sx1 < sx2 )    {
 826                         sx2 += 0.5f;
 827                 } else {
 828                         sx1 += 0.5f;
 829                 }
 830         }
 831
 832         opengl_alloc_render_buffer(2);
 833
 834         render_buffer[0].r = gr_screen.current_color.red;
 835         render_buffer[0].g = gr_screen.current_color.green;
 836         render_buffer[0].b = gr_screen.current_color.blue;
 837         render_buffer[0].a = ba;
 838         render_buffer[0].x = sx2;
 839         render_buffer[0].y = sy2;
 840         render_buffer[0].z = -0.99f;
 841
 842         render_buffer[1].r = gr_screen.current_color.red;
 843         render_buffer[1].g = gr_screen.current_color.green;
 844         render_buffer[1].b = gr_screen.current_color.blue;
 845         render_buffer[1].a = aa;
 846         render_buffer[1].x = sx1;
 847         render_buffer[1].y = sy1;
 848         render_buffer[1].z = -0.99f;
 849
 850         glEnableClientState(GL_COLOR_ARRAY);
 851         glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].r);
 852
 853         glEnableClientState(GL_VERTEX_ARRAY);
 854         glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 855
 856         glDrawArrays(GL_LINES, 0, 2);
 857
 858         glDisableClientState(GL_COLOR_ARRAY);
 859         glDisableClientState(GL_VERTEX_ARRAY);
 860 }
 861
 862 void gr_opengl1_circle( int xc, int yc, int d )
 863 {
 864         int p,x, y, r;
 865
 866         r = d/2;
 867         p=3-d;
 868         x=0;
 869         y=r;
 870
 871         // Big clip
 872         if ( (xc+r) < gr_screen.clip_left ) return;
 873         if ( (xc-r) > gr_screen.clip_right ) return;
 874         if ( (yc+r) < gr_screen.clip_top ) return;
 875         if ( (yc-r) > gr_screen.clip_bottom ) return;
 876
 877         while(x<y)      {
 878                 // Draw the first octant
 879                 gr_opengl1_line( xc-y, yc-x, xc+y, yc-x );
 880                 gr_opengl1_line( xc-y, yc+x, xc+y, yc+x );
 881
 882                 if (p<0)
 883                         p=p+(x<<2)+6;
 884                 else    {
 885                         // Draw the second octant
 886                         gr_opengl1_line( xc-x, yc-y, xc+x, yc-y );
 887                         gr_opengl1_line( xc-x, yc+y, xc+x, yc+y );
 888
 889                         p=p+((x-y)<<2)+10;
 890                         y--;
 891                 }
 892                 x++;
 893         }
 894         if(x==y) {
 895                 gr_opengl1_line( xc-x, yc-y, xc+x, yc-y );
 896                 gr_opengl1_line( xc-x, yc+y, xc+x, yc+y );
 897         }
 898         return;
 899 }
 900
 901 void gr_opengl1_pixel(int x, int y)
 902 {
 903         gr_line(x,y,x,y);
 904 }
 905
 906
 907 // cross fade
 908 void gr_opengl1_cross_fade(int bmap1, int bmap2, int x1, int y1, int x2, int y2, float pct)
 909 {
 910         gr_set_bitmap(bmap1, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, 1.0f - pct );
 911         gr_bitmap(x1, y1);
 912
 913         gr_set_bitmap(bmap2, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, pct );
 914         gr_bitmap(x2, y2);
 915 }
 916
 917 void gr_opengl1_flash(int r, int g, int b)
 918 {
 919         CAP(r,0,255);
 920         CAP(g,0,255);
 921         CAP(b,0,255);
 922
 923         if ( r || g || b ) {
 924                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_ADDITIVE, ZBUFFER_TYPE_NONE );
 925
 926                 float x1, x2, y1, y2;
 927                 x1 = i2fl(gr_screen.clip_left+gr_screen.offset_x);
 928                 y1 = i2fl(gr_screen.clip_top+gr_screen.offset_y);
 929                 x2 = i2fl(gr_screen.clip_right+gr_screen.offset_x);
 930                 y2 = i2fl(gr_screen.clip_bottom+gr_screen.offset_y);
 931
 932                 glColor4ub(r, g, b, 255);
 933
 934                 opengl_alloc_render_buffer(4);
 935
 936                 render_buffer[0].x = x1;
 937                 render_buffer[0].y = y1;
 938                 render_buffer[0].z = -0.99f;
 939
 940                 render_buffer[1].x = x1;
 941                 render_buffer[1].y = y2;
 942                 render_buffer[1].z = -0.99f;
 943
 944                 render_buffer[2].x = x2;
 945                 render_buffer[2].y = y1;
 946                 render_buffer[2].z = -0.99f;
 947
 948                 render_buffer[3].x = x2;
 949                 render_buffer[3].y = y2;
 950                 render_buffer[3].z = -0.99f;
 951
 952                 glEnableClientState(GL_VERTEX_ARRAY);
 953                 glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 954
 955                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 956
 957                 glDisableClientState(GL_VERTEX_ARRAY);
 958         }
 959 }
 960
 961 void gr_opengl1_tmapper( int nverts, vertex **verts, uint flags )
 962 {
 963         opengl1_tmapper_internal( nverts, verts, flags, 0 );
 964 }
 965
 966 #define FIND_SCALED_NUM(x,x0,x1,y0,y1) (((((x)-(x0))*((y1)-(y0)))/((x1)-(x0)))+(y0))
 967
 968 void gr_opengl1_scaler(vertex *va, vertex *vb )
 969 {
 970         float x0, y0, x1, y1;
 971         float u0, v0, u1, v1;
 972         float clipped_x0, clipped_y0, clipped_x1, clipped_y1;
 973         float clipped_u0, clipped_v0, clipped_u1, clipped_v1;
 974         float xmin, xmax, ymin, ymax;
 975         int dx0, dy0, dx1, dy1;
 976
 977         //============= CLIP IT =====================
 978
 979         x0 = va->sx; y0 = va->sy;
 980         x1 = vb->sx; y1 = vb->sy;
 981
 982         xmin = i2fl(gr_screen.clip_left); ymin = i2fl(gr_screen.clip_top);
 983         xmax = i2fl(gr_screen.clip_right); ymax = i2fl(gr_screen.clip_bottom);
 984
 985         u0 = va->u; v0 = va->v;
 986         u1 = vb->u; v1 = vb->v;
 987
 988         // Check for obviously offscreen bitmaps...
 989         if ( (y1<=y0) || (x1<=x0) ) return;
 990         if ( (x1<xmin ) || (x0>xmax) ) return;
 991         if ( (y1<ymin ) || (y0>ymax) ) return;
 992
 993         clipped_u0 = u0; clipped_v0 = v0;
 994         clipped_u1 = u1; clipped_v1 = v1;
 995
 996         clipped_x0 = x0; clipped_y0 = y0;
 997         clipped_x1 = x1; clipped_y1 = y1;
 998
 999         // Clip the left, moving u0 right as necessary
1000         if ( x0 < xmin )        {
1001                 clipped_u0 = FIND_SCALED_NUM(xmin,x0,x1,u0,u1);
1002                 clipped_x0 = xmin;
1003         }
1004
1005         // Clip the right, moving u1 left as necessary
1006         if ( x1 > xmax )        {
1007                 clipped_u1 = FIND_SCALED_NUM(xmax,x0,x1,u0,u1);
1008                 clipped_x1 = xmax;
1009         }
1010
1011         // Clip the top, moving v0 down as necessary
1012         if ( y0 < ymin )        {
1013                 clipped_v0 = FIND_SCALED_NUM(ymin,y0,y1,v0,v1);
1014                 clipped_y0 = ymin;
1015         }
1016
1017         // Clip the bottom, moving v1 up as necessary
1018         if ( y1 > ymax )        {
1019                 clipped_v1 = FIND_SCALED_NUM(ymax,y0,y1,v0,v1);
1020                 clipped_y1 = ymax;
1021         }
1022
1023         dx0 = fl2i(clipped_x0); dx1 = fl2i(clipped_x1);
1024         dy0 = fl2i(clipped_y0); dy1 = fl2i(clipped_y1);
1025
1026         if (dx1<=dx0) return;
1027         if (dy1<=dy0) return;
1028
1029         //============= DRAW IT =====================
1030
1031         vertex v[4];
1032         vertex *vl[4];
1033
1034         vl[0] = &v[0];
1035         v[0].sx = clipped_x0;
1036         v[0].sy = clipped_y0;
1037         v[0].sw = va->sw;
1038         v[0].z = va->z;
1039         v[0].u = clipped_u0;
1040         v[0].v = clipped_v0;
1041
1042         vl[1] = &v[1];
1043         v[1].sx = clipped_x1;
1044         v[1].sy = clipped_y0;
1045         v[1].sw = va->sw;
1046         v[1].z = va->z;
1047         v[1].u = clipped_u1;
1048         v[1].v = clipped_v0;
1049
1050         vl[2] = &v[2];
1051         v[2].sx = clipped_x1;
1052         v[2].sy = clipped_y1;
1053         v[2].sw = va->sw;
1054         v[2].z = va->z;
1055         v[2].u = clipped_u1;
1056         v[2].v = clipped_v1;
1057
1058         vl[3] = &v[3];
1059         v[3].sx = clipped_x0;
1060         v[3].sy = clipped_y1;
1061         v[3].sw = va->sw;
1062         v[3].z = va->z;
1063         v[3].u = clipped_u0;
1064         v[3].v = clipped_v1;
1065
1066         opengl1_tmapper_internal( 4, vl, TMAP_FLAG_TEXTURED, 1 );
1067 }