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 "SDL_opengl.h"
  10
  11 #include "pstypes.h"
  12 #include "2d.h"
  13 #include "gropengl.h"
  14 #include "gropenglinternal.h"
  15 #include "grgl1.h"
  16 #include "bmpman.h"
  17 #include "grinternal.h"
  18 #include "3d.h"
  19 #include "neb.h"
  20 #include "line.h"
  21 #include "palman.h"
  22
  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 = gr_zbuffer_get();
  30
  31         // no zbuffering, no culling
  32         gr_zbuffer_set(GR_ZBUFF_NONE);
  33         gr_opengl_set_cull(0);
  34
  35         opengl_alloc_render_buffer(4);
  36
  37         render_buffer[0].x = i2fl(x);
  38         render_buffer[0].y = i2fl(y);
  39
  40         render_buffer[1].x = i2fl(x);
  41         render_buffer[1].y = i2fl(y + h);
  42
  43         render_buffer[2].x = i2fl(x + w);
  44         render_buffer[2].y = i2fl(y);
  45
  46         render_buffer[3].x = i2fl(x + w);
  47         render_buffer[3].y = i2fl(y + h);
  48
  49         glColor4ub((ubyte)r, (ubyte)g, (ubyte)b, (ubyte)a);
  50
  51         glEnableClientState(GL_VERTEX_ARRAY);
  52
  53         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
  54
  55         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  56
  57         glDisableClientState(GL_VERTEX_ARRAY);
  58
  59         // restore zbuffer and culling
  60         gr_zbuffer_set(saved_zbuf);
  61         gr_opengl_set_cull(1);
  62 }
  63
  64 static void opengl1_aabitmap_ex_internal(int x,int y,int w,int h,int sx,int sy)
  65 {
  66         if ( (w < 1) || (h < 1) ) {
  67                 return;
  68         }
  69
  70         if ( !gr_screen.current_color.is_alphacolor ) {
  71                 return;
  72         }
  73
  74         float u_scale, v_scale;
  75
  76         if ( !opengl1_tcache_set(gr_screen.current_bitmap, TCACHE_TYPE_AABITMAP,
  77                         &u_scale, &v_scale, 0, -1, -1, 0) )
  78         {
  79                 // Couldn't set texture
  80                 mprintf(( "WARNING: Error setting aabitmap texture!\n" ));
  81                 return;
  82         }
  83
  84         opengl1_set_state( TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
  85
  86         float u0, u1, v0, v1;
  87         float x1, x2, y1, y2;
  88         int bw, bh;
  89
  90         bm_get_info( gr_screen.current_bitmap, &bw, &bh );
  91
  92         u0 = u_scale*i2fl(sx)/i2fl(bw);
  93         v0 = v_scale*i2fl(sy)/i2fl(bh);
  94
  95         u1 = u_scale*i2fl(sx+w)/i2fl(bw);
  96         v1 = v_scale*i2fl(sy+h)/i2fl(bh);
  97
  98         x1 = i2fl(x+gr_screen.offset_x);
  99         y1 = i2fl(y+gr_screen.offset_y);
 100         x2 = i2fl(x+w+gr_screen.offset_x);
 101         y2 = i2fl(y+h+gr_screen.offset_y);
 102
 103         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 104                         gr_screen.current_color.blue,gr_screen.current_color.alpha);
 105
 106         opengl_alloc_render_buffer(4);
 107
 108         render_buffer[0].x = x1;
 109         render_buffer[0].y = y1;
 110         render_buffer[0].u = u0;
 111         render_buffer[0].v = v0;
 112
 113         render_buffer[1].x = x1;
 114         render_buffer[1].y = y2;
 115         render_buffer[1].u = u0;
 116         render_buffer[1].v = v1;
 117
 118         render_buffer[2].x = x2;
 119         render_buffer[2].y = y1;
 120         render_buffer[2].u = u1;
 121         render_buffer[2].v = v0;
 122
 123         render_buffer[3].x = x2;
 124         render_buffer[3].y = y2;
 125         render_buffer[3].u = u1;
 126         render_buffer[3].v = v1;
 127
 128         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 129         glEnableClientState(GL_VERTEX_ARRAY);
 130
 131         glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 132         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 133
 134         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 135
 136         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 137         glDisableClientState(GL_VERTEX_ARRAY);
 138 }
 139
 140 static void opengl1_tmapper_internal( int nv, vertex ** verts, uint flags, int is_scaler )
 141 {
 142         int i;
 143         float u_scale = 1.0f, v_scale = 1.0f;
 144
 145         gr_texture_source texture_source = TEXTURE_SOURCE_NONE;
 146         gr_alpha_blend alpha_blend = ALPHA_BLEND_ALPHA_BLEND_ALPHA;
 147         gr_zbuffer_type zbuffer_type = ZBUFFER_TYPE_NONE;
 148
 149         if (Gr_zbuffering) {
 150                 if ( is_scaler || (gr_screen.current_alphablend_mode == GR_ALPHABLEND_FILTER) ) {
 151                         zbuffer_type = ZBUFFER_TYPE_READ;
 152                 } else {
 153                         zbuffer_type = ZBUFFER_TYPE_FULL;
 154                 }
 155         }
 156
 157         int tmap_type = TCACHE_TYPE_NORMAL;
 158
 159         ubyte r = 255, g = 255, b = 255, a = 255;
 160
 161         if ( !(flags & TMAP_FLAG_TEXTURED) ) {
 162                 r = gr_screen.current_color.red;
 163                 g = gr_screen.current_color.green;
 164                 b = gr_screen.current_color.blue;
 165         }
 166
 167         if (gr_screen.current_alphablend_mode == GR_ALPHABLEND_FILTER) {
 168                 alpha_blend = ALPHA_BLEND_ALPHA_ADDITIVE;
 169
 170                 // Blend with screen pixel using src*alpha+dst
 171
 172                 if (gr_screen.current_alpha < 1.0f) {
 173                         r = ubyte((r * gr_screen.current_alpha) + 0.5f);
 174                         g = ubyte((g * gr_screen.current_alpha) + 0.5f);
 175                         b = ubyte((b * gr_screen.current_alpha) + 0.5f);
 176                 }
 177         }
 178
 179         if (flags & TMAP_FLAG_BITMAP_SECTION) {
 180                 SDL_assert( !(flags & TMAP_FLAG_BITMAP_INTERFACE) );
 181                 tmap_type = TCACHE_TYPE_BITMAP_SECTION;
 182         } else if (flags & TMAP_FLAG_BITMAP_INTERFACE) {
 183                 SDL_assert( !(flags & TMAP_FLAG_BITMAP_SECTION) );
 184                 tmap_type = TCACHE_TYPE_BITMAP_INTERFACE;
 185         }
 186
 187         if (flags & TMAP_FLAG_TEXTURED) {
 188                 if ( !opengl1_tcache_set(gr_screen.current_bitmap, tmap_type, &u_scale,
 189                                 &v_scale, 0, gr_screen.current_bitmap_sx, gr_screen.current_bitmap_sy, 0) )
 190                 {
 191                         mprintf(( "Not rendering a texture because it didn't fit in VRAM!\n" ));
 192                         return;
 193                 }
 194
 195                 // use non-filtered textures for bitmap sections and UI graphics
 196                 switch (tmap_type) {
 197                         case TCACHE_TYPE_BITMAP_INTERFACE:
 198                         case TCACHE_TYPE_BITMAP_SECTION:
 199                                 texture_source = TEXTURE_SOURCE_NO_FILTERING;
 200                                 break;
 201
 202                         default:
 203                                 texture_source = TEXTURE_SOURCE_DECAL;
 204                                 break;
 205                 }
 206         }
 207
 208
 209         opengl1_set_state( texture_source, alpha_blend, zbuffer_type );
 210
 211         float ox = gr_screen.offset_x * 16.0f;
 212         float oy = gr_screen.offset_y * 16.0f;
 213
 214         if (flags & TMAP_FLAG_PIXEL_FOG) {
 215                 int fr, fg, fb;
 216                 int ra, ga, ba;
 217                 float sx, sy;
 218
 219                 ra = ga = ba = 0;
 220
 221                 for (i = nv-1; i >= 0; i--) {
 222                         vertex * va = verts[i];
 223
 224                         sx = (va->sx * 16.0f + ox) / 16.0f;
 225                         sy = (va->sy * 16.0f + oy) / 16.0f;
 226
 227                         neb2_get_pixel((int)sx, (int)sy, &fr, &fg, &fb);
 228
 229                         ra += fr;
 230                         ga += fg;
 231                         ba += fb;
 232                 }
 233
 234                 ra /= nv;
 235                 ga /= nv;
 236                 ba /= nv;
 237
 238                 gr_opengl1_fog_set(GR_FOGMODE_FOG, ra, ga, ba, -1.0f, -1.0f);
 239         }
 240
 241         opengl_alloc_render_buffer(nv);
 242
 243         int rb_offset = 0;
 244
 245         float sx, sy, sz = 0.99f, rhw = 1.0f;
 246
 247         bool bZval = (Gr_zbuffering || (flags & TMAP_FLAG_NEBULA));
 248         bool bCorrect = ((flags & TMAP_FLAG_CORRECT) == TMAP_FLAG_CORRECT);
 249         bool bAlpha = ((flags & TMAP_FLAG_ALPHA) == TMAP_FLAG_ALPHA);
 250         bool bNebula = ((flags & TMAP_FLAG_NEBULA) == TMAP_FLAG_NEBULA);
 251         bool bRamp = ((flags & TMAP_FLAG_RAMP) && (flags & TMAP_FLAG_GOURAUD));
 252         bool bRGB = ((flags & TMAP_FLAG_RGB) && (flags & TMAP_FLAG_GOURAUD));
 253         bool bTextured = ((flags & TMAP_FLAG_TEXTURED) == TMAP_FLAG_TEXTURED);
 254
 255         for (i = nv-1; i >= 0; i--) {
 256                 vertex *va = verts[i];
 257
 258                 if (bZval) {
 259                         sz = 1.0f - 1.0f / (1.0f + va->z / (32768.0f / 256.0f));
 260
 261                         if ( sz > 0.98f ) {
 262                                 sz = 0.98f;
 263                         }
 264                 }
 265
 266                 if (bCorrect) {
 267                         rhw = 1.0f / va->sw;
 268                 }
 269
 270                 if (bAlpha) {
 271                         a = va->a;
 272                 }
 273
 274                 if (bRGB) {
 275                         // Make 0.75 be 256.0f
 276                         r = (ubyte)Gr_gamma_lookup[va->r];
 277                         g = (ubyte)Gr_gamma_lookup[va->g];
 278                         b = (ubyte)Gr_gamma_lookup[va->b];
 279                 } else if (bNebula) {
 280                         int pal = (va->b*(NEBULA_COLORS-1))/255;
 281                         r = gr_palette[pal*3+0];
 282                         g = gr_palette[pal*3+1];
 283                         b = gr_palette[pal*3+2];
 284                 } else if (bRamp) {
 285                         r = g = b = (ubyte)Gr_gamma_lookup[va->b];
 286                 }
 287
 288                 render_buffer[rb_offset].r = r;
 289                 render_buffer[rb_offset].g = g;
 290                 render_buffer[rb_offset].b = b;
 291                 render_buffer[rb_offset].a = a;
 292
 293                 sx = (va->sx * 16.0f + ox) / 16.0f;
 294                 sy = (va->sy * 16.0f + oy) / 16.0f;
 295
 296                 if (bTextured) {
 297                         render_buffer[rb_offset].u = va->u * u_scale;
 298                         render_buffer[rb_offset].v = va->v * v_scale;
 299                 }
 300
 301                 render_buffer[rb_offset].x = sx * rhw;
 302                 render_buffer[rb_offset].y = sy * rhw;
 303                 render_buffer[rb_offset].z = -sz * rhw;
 304                 render_buffer[rb_offset].w = rhw;
 305
 306                 ++rb_offset;
 307         }
 308
 309         if (flags & TMAP_FLAG_TEXTURED) {
 310                 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 311                 glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 312         }
 313
 314         glEnableClientState(GL_COLOR_ARRAY);
 315         glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].r);
 316
 317         glEnableClientState(GL_VERTEX_ARRAY);
 318         glVertexPointer(4, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 319
 320         glDrawArrays(GL_TRIANGLE_FAN, 0, rb_offset);
 321
 322         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 323         glDisableClientState(GL_SECONDARY_COLOR_ARRAY);
 324         glDisableClientState(GL_COLOR_ARRAY);
 325         glDisableClientState(GL_VERTEX_ARRAY);
 326 }
 327
 328 void gr_opengl1_rect(int x,int y,int w,int h)
 329 {
 330         opengl1_rect_internal(x, y, w, h, gr_screen.current_color.red,
 331                         gr_screen.current_color.green, gr_screen.current_color.blue,
 332                         gr_screen.current_color.alpha);
 333 }
 334
 335 void gr_opengl1_shade(int x,int y,int w,int h)
 336 {
 337         int r,g,b,a;
 338
 339         float shade1 = 1.0f;
 340         float shade2 = 6.0f;
 341
 342         r = fl2i(gr_screen.current_shader.r*255.0f*shade1);
 343         CAP(r, 0, 255);
 344         g = fl2i(gr_screen.current_shader.g*255.0f*shade1);
 345         CAP(g, 0, 255);
 346         b = fl2i(gr_screen.current_shader.b*255.0f*shade1);
 347         CAP(b, 0, 255);
 348         a = fl2i(gr_screen.current_shader.c*255.0f*shade2);
 349         CAP(a, 0, 255);
 350
 351         opengl1_rect_internal(x, y, w, h, r, g, b, a);
 352 }
 353
 354 void gr_opengl1_aabitmap_ex(int x,int y,int w,int h,int sx,int sy)
 355 {
 356         if ( (x > gr_screen.clip_right ) || ((x+w-1) < gr_screen.clip_left) )
 357                 return;
 358
 359         if ( (y > gr_screen.clip_bottom ) || ((y+h-1) < gr_screen.clip_top) )
 360                 return;
 361
 362         opengl1_aabitmap_ex_internal(x, y, w, h, sx, sy);
 363 }
 364
 365 void gr_opengl1_aabitmap(int x, int y)
 366 {
 367         int w, h;
 368
 369         bm_get_info( gr_screen.current_bitmap, &w, &h, NULL );
 370
 371         gr_opengl1_aabitmap_ex(x, y, w, h, 0, 0);
 372 }
 373
 374 void gr_opengl1_string( int sx, int sy, const char *s )
 375 {
 376         int width, spacing, letter;
 377         int x, y;
 378         int rb_offset;
 379         float u_scale, v_scale;
 380         float u0, u1, v0, v1;
 381         float x1, x2, y1, y2;
 382         int bw, bh;
 383         float fbw, fbh;
 384
 385         if ( !Current_font )    {
 386                 return;
 387         }
 388
 389         gr_set_bitmap(Current_font->bitmap_id, GR_ALPHABLEND_NONE, GR_BITBLT_MODE_NORMAL, 1.0f, -1, -1);
 390
 391         if ( !opengl1_tcache_set( gr_screen.current_bitmap, TCACHE_TYPE_AABITMAP, &u_scale, &v_scale, 0, -1, -1, 0 ) )  {
 392                 // Couldn't set texture
 393                 mprintf(( "WARNING: Error setting aabitmap texture!\n" ));
 394                 return;
 395         }
 396
 397         bm_get_info( gr_screen.current_bitmap, &bw, &bh );
 398
 399         fbw = 1.0f / i2fl(bw);
 400         fbh = 1.0f / i2fl(bh);
 401
 402         opengl1_set_state( TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 403
 404         // don't want to create a super huge buffer size (i.e. credits text)
 405         const int alocsize = 320;       // 80 characters max per render call
 406         opengl_alloc_render_buffer(alocsize);
 407
 408         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 409                         gr_screen.current_color.blue, gr_screen.current_color.alpha);
 410
 411         glEnableClientState(GL_VERTEX_ARRAY);
 412         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 413
 414         glVertexPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 415         glTexCoordPointer(2, GL_FLOAT, sizeof(rb_t), &render_buffer[0].u);
 416
 417         y = sy;
 418
 419         if (sx==0x8000) {                       //centered
 420                 x = get_centered_x(s);
 421         } else {
 422                 x = sx;
 423         }
 424
 425         spacing = 0;
 426         rb_offset = 0;
 427
 428         while (*s)      {
 429                 x += spacing;
 430
 431                 while (*s== '\n' )      {
 432                         s++;
 433                         y += Current_font->h;
 434                         if (sx==0x8000) {                       //centered
 435                                 x = get_centered_x(s);
 436                         } else {
 437                                 x = sx;
 438                         }
 439                 }
 440                 if (*s == 0 ) break;
 441
 442                 letter = get_char_width(s[0],s[1],&width,&spacing);
 443                 s++;
 444
 445                 //not in font, draw as space
 446                 if (letter<0)   {
 447                         continue;
 448                 }
 449
 450                 int xd, yd, xc, yc;
 451                 int wc, hc;
 452
 453                 // Check if this character is totally clipped
 454                 if ( x + width < gr_screen.clip_left ) continue;
 455                 if ( y + Current_font->h < gr_screen.clip_top ) continue;
 456                 if ( x > gr_screen.clip_right ) continue;
 457                 if ( y > gr_screen.clip_bottom ) continue;
 458
 459                 xd = yd = 0;
 460                 if ( x < gr_screen.clip_left ) xd = gr_screen.clip_left - x;
 461                 if ( y < gr_screen.clip_top ) yd = gr_screen.clip_top - y;
 462                 xc = x+xd;
 463                 yc = y+yd;
 464
 465                 wc = width - xd; hc = Current_font->h - yd;
 466                 if ( xc + wc > gr_screen.clip_right ) wc = gr_screen.clip_right - xc;
 467                 if ( yc + hc > gr_screen.clip_bottom ) hc = gr_screen.clip_bottom - yc;
 468
 469                 if ( wc < 1 ) continue;
 470                 if ( hc < 1 ) continue;
 471
 472                 float u = i2fl(Current_font->bm_u[letter] + xd);
 473                 float v = i2fl(Current_font->bm_v[letter] + yd);
 474
 475                 x1 = i2fl(xc + gr_screen.offset_x);
 476                 y1 = i2fl(yc + gr_screen.offset_y);
 477                 x2 = x1 + i2fl(wc);
 478                 y2 = y1 + i2fl(hc);
 479
 480                 u0 = u_scale * (u * fbw);
 481                 v0 = v_scale * (v * fbh);
 482
 483                 u1 = u_scale * ((u+i2fl(wc)) * fbw);
 484                 v1 = v_scale * ((v+i2fl(hc)) * fbh);
 485
 486                 // maybe go ahead and draw
 487                 if (rb_offset == alocsize) {
 488                         glDrawArrays(GL_TRIANGLE_STRIP, 0, rb_offset);
 489                         rb_offset = 0;
 490                 }
 491
 492                 render_buffer[rb_offset].x = x1;
 493                 render_buffer[rb_offset].y = y1;
 494                 render_buffer[rb_offset].u = u0;
 495                 render_buffer[rb_offset].v = v0;
 496                 ++rb_offset;
 497
 498                 render_buffer[rb_offset].x = x1;
 499                 render_buffer[rb_offset].y = y2;
 500                 render_buffer[rb_offset].u = u0;
 501                 render_buffer[rb_offset].v = v1;
 502                 ++rb_offset;
 503
 504                 render_buffer[rb_offset].x = x2;
 505                 render_buffer[rb_offset].y = y1;
 506                 render_buffer[rb_offset].u = u1;
 507                 render_buffer[rb_offset].v = v0;
 508                 ++rb_offset;
 509
 510                 render_buffer[rb_offset].x = x2;
 511                 render_buffer[rb_offset].y = y2;
 512                 render_buffer[rb_offset].u = u1;
 513                 render_buffer[rb_offset].v = v1;
 514                 ++rb_offset;
 515         }
 516
 517         if (rb_offset) {
 518                 glDrawArrays(GL_TRIANGLE_STRIP, 0, rb_offset);
 519         }
 520
 521         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 522         glDisableClientState(GL_VERTEX_ARRAY);
 523 }
 524
 525 void gr_opengl1_line(int x1,int y1,int x2,int y2)
 526 {
 527         opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 528
 529         INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,
 530                         gr_screen.clip_right,gr_screen.clip_bottom,return,void(),void());
 531
 532         float sx1, sy1;
 533         float sx2, sy2;
 534
 535         sx1 = i2fl(x1 + gr_screen.offset_x)+0.5f;
 536         sy1 = i2fl(y1 + gr_screen.offset_y)+0.5f;
 537         sx2 = i2fl(x2 + gr_screen.offset_x)+0.5f;
 538         sy2 = i2fl(y2 + gr_screen.offset_y)+0.5f;
 539
 540         opengl_alloc_render_buffer(2);
 541
 542         if ( x1 == x2 && y1 == y2 ) {
 543                 render_buffer[0].x = sx1;
 544                 render_buffer[0].y = sy1;
 545                 render_buffer[0].z = -0.99f;
 546
 547                 glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 548                                 gr_screen.current_color.blue, gr_screen.current_color.alpha);
 549
 550                 glEnableClientState(GL_VERTEX_ARRAY);
 551                 glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 552
 553                 glDrawArrays(GL_POINTS, 0, 1);
 554
 555                 glDisableClientState(GL_VERTEX_ARRAY);
 556
 557                 return;
 558         }
 559
 560         if ( x1 == x2 ) {
 561                 if ( sy1 < sy2 )    {
 562                         sy2 += 0.5f;
 563                 } else {
 564                         sy1 += 0.5f;
 565                 }
 566         } else if ( y1 == y2 )  {
 567                 if ( sx1 < sx2 )    {
 568                         sx2 += 0.5f;
 569                 } else {
 570                         sx1 += 0.5f;
 571                 }
 572         }
 573
 574         render_buffer[0].x = sx2;
 575         render_buffer[0].y = sy2;
 576         render_buffer[0].z = -0.99f;
 577
 578         render_buffer[1].x = sx1;
 579         render_buffer[1].y = sy1;
 580         render_buffer[1].z = -0.99f;
 581
 582         glColor4ub(gr_screen.current_color.red, gr_screen.current_color.green,
 583                         gr_screen.current_color.blue, gr_screen.current_color.alpha);
 584
 585         glEnableClientState(GL_VERTEX_ARRAY);
 586         glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 587
 588         glDrawArrays(GL_LINES, 0, 2);
 589
 590         glDisableClientState(GL_VERTEX_ARRAY);
 591 }
 592
 593 void gr_opengl1_aaline(vertex *v1, vertex *v2)
 594 {
 595         gr_opengl1_line( fl2i(v1->sx), fl2i(v1->sy), fl2i(v2->sx), fl2i(v2->sy) );
 596 }
 597
 598 void gr_opengl1_gradient(int x1,int y1,int x2,int y2)
 599 {
 600         int swapped=0;
 601
 602         if ( !gr_screen.current_color.is_alphacolor )   {
 603                 gr_line( x1, y1, x2, y2 );
 604                 return;
 605         }
 606
 607         INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,
 608                         gr_screen.clip_right,gr_screen.clip_bottom,return,void(),swapped=1);
 609
 610         opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_BLEND_ALPHA, ZBUFFER_TYPE_NONE );
 611
 612         int aa = swapped ? 0 : gr_screen.current_color.alpha;
 613         int ba = swapped ? gr_screen.current_color.alpha : 0;
 614
 615         float sx1, sy1;
 616         float sx2, sy2;
 617
 618         sx1 = i2fl(x1 + gr_screen.offset_x)+0.5f;
 619         sy1 = i2fl(y1 + gr_screen.offset_y)+0.5f;
 620         sx2 = i2fl(x2 + gr_screen.offset_x)+0.5f;
 621         sy2 = i2fl(y2 + gr_screen.offset_y)+0.5f;
 622
 623         if ( x1 == x2 ) {
 624                 if ( sy1 < sy2 )    {
 625                         sy2 += 0.5f;
 626                 } else {
 627                         sy1 += 0.5f;
 628                 }
 629         } else if ( y1 == y2 )  {
 630                 if ( sx1 < sx2 )    {
 631                         sx2 += 0.5f;
 632                 } else {
 633                         sx1 += 0.5f;
 634                 }
 635         }
 636
 637         opengl_alloc_render_buffer(2);
 638
 639         render_buffer[0].r = gr_screen.current_color.red;
 640         render_buffer[0].g = gr_screen.current_color.green;
 641         render_buffer[0].b = gr_screen.current_color.blue;
 642         render_buffer[0].a = (ubyte)ba;
 643         render_buffer[0].x = sx2;
 644         render_buffer[0].y = sy2;
 645         render_buffer[0].z = -0.99f;
 646
 647         render_buffer[1].r = gr_screen.current_color.red;
 648         render_buffer[1].g = gr_screen.current_color.green;
 649         render_buffer[1].b = gr_screen.current_color.blue;
 650         render_buffer[1].a = (ubyte)aa;
 651         render_buffer[1].x = sx1;
 652         render_buffer[1].y = sy1;
 653         render_buffer[1].z = -0.99f;
 654
 655         glEnableClientState(GL_COLOR_ARRAY);
 656         glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(rb_t), &render_buffer[0].r);
 657
 658         glEnableClientState(GL_VERTEX_ARRAY);
 659         glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 660
 661         glDrawArrays(GL_LINES, 0, 2);
 662
 663         glDisableClientState(GL_COLOR_ARRAY);
 664         glDisableClientState(GL_VERTEX_ARRAY);
 665 }
 666
 667 void gr_opengl1_circle( int xc, int yc, int d )
 668 {
 669         int p,x, y, r;
 670
 671         r = d/2;
 672         p=3-d;
 673         x=0;
 674         y=r;
 675
 676         // Big clip
 677         if ( (xc+r) < gr_screen.clip_left ) return;
 678         if ( (xc-r) > gr_screen.clip_right ) return;
 679         if ( (yc+r) < gr_screen.clip_top ) return;
 680         if ( (yc-r) > gr_screen.clip_bottom ) return;
 681
 682         while(x<y)      {
 683                 // Draw the first octant
 684                 gr_opengl1_line( xc-y, yc-x, xc+y, yc-x );
 685                 gr_opengl1_line( xc-y, yc+x, xc+y, yc+x );
 686
 687                 if (p<0)
 688                         p=p+(x<<2)+6;
 689                 else    {
 690                         // Draw the second octant
 691                         gr_opengl1_line( xc-x, yc-y, xc+x, yc-y );
 692                         gr_opengl1_line( xc-x, yc+y, xc+x, yc+y );
 693
 694                         p=p+((x-y)<<2)+10;
 695                         y--;
 696                 }
 697                 x++;
 698         }
 699         if(x==y) {
 700                 gr_opengl1_line( xc-x, yc-y, xc+x, yc-y );
 701                 gr_opengl1_line( xc-x, yc+y, xc+x, yc+y );
 702         }
 703         return;
 704 }
 705
 706 void gr_opengl1_pixel(int x, int y)
 707 {
 708         gr_opengl1_line(x, y, x, y);
 709 }
 710
 711
 712 // cross fade
 713 void gr_opengl1_cross_fade(int bmap1, int bmap2, int x1, int y1, int x2, int y2, float pct)
 714 {
 715         gr_set_bitmap(bmap1, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, 1.0f - pct );
 716         gr_bitmap(x1, y1);
 717
 718         gr_set_bitmap(bmap2, GR_ALPHABLEND_FILTER, GR_BITBLT_MODE_NORMAL, pct );
 719         gr_bitmap(x2, y2);
 720 }
 721
 722 void gr_opengl1_flash(int r, int g, int b)
 723 {
 724         CAP(r,0,255);
 725         CAP(g,0,255);
 726         CAP(b,0,255);
 727
 728         if ( r || g || b ) {
 729                 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_ALPHA_ADDITIVE, ZBUFFER_TYPE_NONE );
 730
 731                 float x1, x2, y1, y2;
 732                 x1 = i2fl(gr_screen.clip_left+gr_screen.offset_x);
 733                 y1 = i2fl(gr_screen.clip_top+gr_screen.offset_y);
 734                 x2 = i2fl(gr_screen.clip_right+gr_screen.offset_x);
 735                 y2 = i2fl(gr_screen.clip_bottom+gr_screen.offset_y);
 736
 737                 glColor4ub((GLubyte)r, (GLubyte)g, (GLubyte)b, 255);
 738
 739                 opengl_alloc_render_buffer(4);
 740
 741                 render_buffer[0].x = x1;
 742                 render_buffer[0].y = y1;
 743                 render_buffer[0].z = -0.99f;
 744
 745                 render_buffer[1].x = x1;
 746                 render_buffer[1].y = y2;
 747                 render_buffer[1].z = -0.99f;
 748
 749                 render_buffer[2].x = x2;
 750                 render_buffer[2].y = y1;
 751                 render_buffer[2].z = -0.99f;
 752
 753                 render_buffer[3].x = x2;
 754                 render_buffer[3].y = y2;
 755                 render_buffer[3].z = -0.99f;
 756
 757                 glEnableClientState(GL_VERTEX_ARRAY);
 758                 glVertexPointer(3, GL_FLOAT, sizeof(rb_t), &render_buffer[0].x);
 759
 760                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 761
 762                 glDisableClientState(GL_VERTEX_ARRAY);
 763         }
 764 }
 765
 766 void gr_opengl1_tmapper( int nverts, vertex **verts, uint flags )
 767 {
 768         opengl1_tmapper_internal( nverts, verts, flags, 0 );
 769 }
 770
 771 #define FIND_SCALED_NUM(x,x0,x1,y0,y1) (((((x)-(x0))*((y1)-(y0)))/((x1)-(x0)))+(y0))
 772
 773 void gr_opengl1_scaler(vertex *va, vertex *vb )
 774 {
 775         float x0, y0, x1, y1;
 776         float u0, v0, u1, v1;
 777         float clipped_x0, clipped_y0, clipped_x1, clipped_y1;
 778         float clipped_u0, clipped_v0, clipped_u1, clipped_v1;
 779         float xmin, xmax, ymin, ymax;
 780         int dx0, dy0, dx1, dy1;
 781
 782         //============= CLIP IT =====================
 783
 784         x0 = va->sx; y0 = va->sy;
 785         x1 = vb->sx; y1 = vb->sy;
 786
 787         xmin = i2fl(gr_screen.clip_left); ymin = i2fl(gr_screen.clip_top);
 788         xmax = i2fl(gr_screen.clip_right); ymax = i2fl(gr_screen.clip_bottom);
 789
 790         u0 = va->u; v0 = va->v;
 791         u1 = vb->u; v1 = vb->v;
 792
 793         // Check for obviously offscreen bitmaps...
 794         if ( (y1<=y0) || (x1<=x0) ) return;
 795         if ( (x1<xmin ) || (x0>xmax) ) return;
 796         if ( (y1<ymin ) || (y0>ymax) ) return;
 797
 798         clipped_u0 = u0; clipped_v0 = v0;
 799         clipped_u1 = u1; clipped_v1 = v1;
 800
 801         clipped_x0 = x0; clipped_y0 = y0;
 802         clipped_x1 = x1; clipped_y1 = y1;
 803
 804         // Clip the left, moving u0 right as necessary
 805         if ( x0 < xmin )        {
 806                 clipped_u0 = FIND_SCALED_NUM(xmin,x0,x1,u0,u1);
 807                 clipped_x0 = xmin;
 808         }
 809
 810         // Clip the right, moving u1 left as necessary
 811         if ( x1 > xmax )        {
 812                 clipped_u1 = FIND_SCALED_NUM(xmax,x0,x1,u0,u1);
 813                 clipped_x1 = xmax;
 814         }
 815
 816         // Clip the top, moving v0 down as necessary
 817         if ( y0 < ymin )        {
 818                 clipped_v0 = FIND_SCALED_NUM(ymin,y0,y1,v0,v1);
 819                 clipped_y0 = ymin;
 820         }
 821
 822         // Clip the bottom, moving v1 up as necessary
 823         if ( y1 > ymax )        {
 824                 clipped_v1 = FIND_SCALED_NUM(ymax,y0,y1,v0,v1);
 825                 clipped_y1 = ymax;
 826         }
 827
 828         dx0 = fl2i(clipped_x0); dx1 = fl2i(clipped_x1);
 829         dy0 = fl2i(clipped_y0); dy1 = fl2i(clipped_y1);
 830
 831         if (dx1<=dx0) return;
 832         if (dy1<=dy0) return;
 833
 834         //============= DRAW IT =====================
 835
 836         vertex v[4];
 837         vertex *vl[4];
 838
 839         vl[0] = &v[0];
 840         v[0].sx = clipped_x0;
 841         v[0].sy = clipped_y0;
 842         v[0].sw = va->sw;
 843         v[0].z = va->z;
 844         v[0].u = clipped_u0;
 845         v[0].v = clipped_v0;
 846
 847         vl[1] = &v[1];
 848         v[1].sx = clipped_x1;
 849         v[1].sy = clipped_y0;
 850         v[1].sw = va->sw;
 851         v[1].z = va->z;
 852         v[1].u = clipped_u1;
 853         v[1].v = clipped_v0;
 854
 855         vl[2] = &v[2];
 856         v[2].sx = clipped_x1;
 857         v[2].sy = clipped_y1;
 858         v[2].sw = va->sw;
 859         v[2].z = va->z;
 860         v[2].u = clipped_u1;
 861         v[2].v = clipped_v1;
 862
 863         vl[3] = &v[3];
 864         v[3].sx = clipped_x0;
 865         v[3].sy = clipped_y1;
 866         v[3].sw = va->sw;
 867         v[3].z = va->z;
 868         v[3].u = clipped_u0;
 869         v[3].v = clipped_v1;
 870
 871         opengl1_tmapper_internal( 4, vl, TMAP_FLAG_TEXTURED, 1 );
 872 }