lib/devices/opengl.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <math.h>
   5
   6 #include "../gfxdevice.h"
   7 #include "../gfxtools.h"
   8 #include "../MD5.h"
   9 #include "../types.h"
  10
  11 #include <math.h>
  12 #include <time.h>
  13 #include <GL/gl.h>
  14 #include <GL/glut.h>
  15
  16 #include <stdarg.h>
  17
  18 //#define ZSTEP (1/65536.0)
  19 #define ZSTEP (1/4.0)
  20
  21 typedef struct _fontlist {
  22     gfxfont_t*font;
  23     struct _fontlist*next;
  24 } fontlist_t;
  25
  26 typedef struct _internal {
  27     gfxfont_t*font;
  28     char*fontid;
  29     fontlist_t* fontlist;
  30     int width, height;
  31     int currentz;
  32
  33     int config_polygonoutlines;
  34
  35     GLUtesselator *tesselator;
  36     GLUtesselator *tesselator_line;
  37     GLUtesselator *tesselator_tex;
  38 } internal_t;
  39
  40 static int verbose = 0;
  41 static void dbg(char*format, ...)
  42 {
  43     char buf[1024];
  44     int l;
  45     va_list arglist;
  46     if(!verbose)
  47         return;
  48     va_start(arglist, format);
  49     vsprintf(buf, format, arglist);
  50     va_end(arglist);
  51     l = strlen(buf);
  52     while(l && buf[l-1]=='\n') {
  53         buf[l-1] = 0;
  54         l--;
  55     }
  56     printf("(device-opengl) %s\n", buf);
  57     fflush(stdout);
  58 }
  59
  60 #ifndef CALLBACK
  61 #define CALLBACK
  62 #endif
  63
  64 typedef void(*callbackfunction_t)();
  65
  66 void CALLBACK errorCallback(GLenum errorCode)
  67 {
  68    const GLubyte *estring;
  69    estring = gluErrorString(errorCode);
  70    dbg("Tessellation Error: %s\n", estring);
  71    exit(0);
  72 }
  73 void CALLBACK beginCallback(GLenum which)
  74 {
  75    glBegin(which);
  76 }
  77 void CALLBACK endCallback(void)
  78 {
  79    glEnd();
  80 }
  81 void CALLBACK vertexCallback(GLvoid *vertex)
  82 {
  83    double*xyz = (GLdouble*)vertex;
  84    glVertex3d(xyz[0],xyz[1],xyz[2]);
  85 }
  86 void CALLBACK combineCallback(GLdouble coords[3], GLdouble *data[4], GLfloat w[4], GLdouble **out)
  87 {
  88    GLdouble *vertex;
  89    vertex = (GLdouble *) malloc(6 * sizeof(GLdouble));
  90    vertex[0] = coords[0];
  91    vertex[1] = coords[1];
  92    vertex[2] = coords[2];
  93    *out = vertex;
  94 }
  95 void CALLBACK vertexCallbackTex(GLvoid *vertex)
  96 {
  97    double*v = (GLdouble*)vertex;
  98    glTexCoord2f(v[3],v[4]);
  99    glVertex3d(v[0],v[1],v[2]);
 100 }
 101 void CALLBACK combineCallbackTex(GLdouble coords[3], GLdouble *data[4], GLfloat w[4], GLdouble **out)
 102 {
 103    GLdouble *vertex, *texCoord;
 104    vertex = (GLdouble *) malloc(5 * sizeof(GLdouble));
 105    vertex[0] = coords[0];
 106    vertex[1] = coords[1];
 107    vertex[2] = coords[2];
 108    texCoord = &vertex[3];
 109    vertex[3] = w[0]*data[0][3] + w[1]*data[1][3] + w[2]*data[2][3] + w[3]*data[3][3];
 110    vertex[4] = w[0]*data[0][4] + w[1]*data[1][4] + w[2]*data[2][4] + w[3]*data[3][4];
 111    *out = vertex;
 112 }
 113
 114 int opengl_setparameter(struct _gfxdevice*dev, const char*key, const char*value)
 115 {
 116     internal_t*i = (internal_t*)dev->internal;
 117     dbg("setparameter %s=%s", key, value);
 118     if(!strcmp(key, "polygonoutlines")) {
 119         i->config_polygonoutlines = atoi(value);
 120     }
 121     return 0;
 122 }
 123
 124 void opengl_startpage(struct _gfxdevice*dev, int width, int height)
 125 {
 126     dbg("startpage %d %d", width, height);
 127     internal_t*i = (internal_t*)dev->internal;
 128     i->width = width;
 129     i->height = height;
 130     i->currentz = 0;
 131 }
 132
 133 void opengl_startclip(struct _gfxdevice*dev, gfxline_t*line)
 134 {
 135     dbg("startclip");
 136 }
 137
 138 void opengl_endclip(struct _gfxdevice*dev)
 139 {
 140     dbg("endclip");
 141 }
 142
 143 void opengl_stroke(struct _gfxdevice*dev, gfxline_t*line, gfxcoord_t width, gfxcolor_t*color, gfx_capType cap_style, gfx_joinType joint_style, gfxcoord_t miterLimit)
 144 {
 145     dbg("stroke");
 146     internal_t*i = (internal_t*)dev->internal;
 147     i->currentz++;
 148     char running = 0;
 149     gfxline_t*l=0;
 150
 151     glColor4f(color->r/255.0, color->g/255.0, color->b/255.0, color->a/255.0);
 152
 153     //glLineWidth(width*64);
 154     if(width <= 0) {
 155         width = 1.0;
 156     }
 157     glLineWidth(width);
 158     double z = i->currentz*ZSTEP;
 159
 160     glPolygonOffset(0.0, 500.0);
 161
 162     l = line;
 163     while(l) {
 164         if(l->type == gfx_moveTo) {
 165             if(running) {
 166                 running = 0;
 167                 glEnd();
 168             }
 169         }
 170         if(!running) {
 171             running = 1;
 172             glBegin(GL_LINE_STRIP);
 173         }
 174         glVertex3d(l->x, l->y, z);
 175         l=l->next;
 176     }
 177     if(running) {
 178         running = 0;
 179         glEnd();
 180     }
 181     glLineWidth(1.0);
 182 }
 183
 184 #define SPLINE_SUBDIVISION 2
 185
 186 void tesselatePolygon(GLUtesselator*tesselator, double z, gfxline_t*line)
 187 {
 188     int len = 0;
 189     gfxline_t*l=0;
 190     double lastx=0,lasty=0;
 191     double*xyz=0;
 192     char running = 0;
 193     gluTessBeginPolygon(tesselator, NULL);
 194     l = line;
 195     len = 0;
 196     while(l) {
 197         if(l->type == gfx_splineTo) {
 198             double c = sqrt(abs(l->x-2*l->sx+lastx) + abs(l->y-2*l->sy+lasty))*SPLINE_SUBDIVISION;
 199             int steps = (int)c;
 200             if(steps<1) steps = 1;
 201             len += steps;
 202         } else {
 203             len++;
 204         }
 205         l = l->next;
 206     }
 207     //printf("full len:%d\n", len);
 208     xyz = malloc(sizeof(double)*3*len);
 209     l = line;
 210     len = 0;
 211     while(l) {
 212         if(l->type == gfx_moveTo) {
 213             if(running) {
 214                 running = 0;
 215                 gluTessEndContour(tesselator);
 216             }
 217         }
 218         if(!running) {
 219             running = 1;
 220             gluTessBeginContour(tesselator);
 221         }
 222
 223         if(l->type == gfx_splineTo) {
 224             int j;
 225             double c = sqrt(abs(l->x-2*l->sx+lastx) + abs(l->y-2*l->sy+lasty))*SPLINE_SUBDIVISION;
 226             int steps = (int)c;
 227             if(steps<1) steps = 1;
 228             //printf("c=%f d1=%f (%f/%f) d2=%f (%f/%f)\n", c,d1,l->x-l->sx,l->y-l->sy,d2,lastx-l->sx,lasty-l->sy);
 229             //printf("%f %f %f\n", lastx, l->sx, l->x);
 230             //printf("%f %f %f\n", lasty, l->sy, l->y);
 231             for(j=1;j<=steps;j++) {
 232                 //printf("%d\n", j);
 233                 double t = (double)j / (double)steps;
 234                 xyz[len*3+0] = lastx*(1-t)*(1-t) + 2*l->sx*(1-t)*t + l->x*t*t;
 235                 xyz[len*3+1] = lasty*(1-t)*(1-t) + 2*l->sy*(1-t)*t + l->y*t*t;
 236                 xyz[len*3+2] = z;
 237                 gluTessVertex(tesselator, &xyz[len*3], &xyz[len*3]);
 238                 len++;
 239             }
 240             //printf("%d\n", len);
 241         } else {
 242             xyz[len*3+0] = l->x;
 243             xyz[len*3+1] = l->y;
 244             xyz[len*3+2] = z;
 245             gluTessVertex(tesselator, &xyz[len*3], &xyz[len*3]);
 246             len++;
 247         }
 248         lastx = l->x;
 249         lasty = l->y;
 250
 251         l=l->next;
 252     }
 253     if(running) {
 254         running = 0;
 255         gluTessEndContour(tesselator);
 256     }
 257     gluTessEndPolygon(tesselator);
 258     free(xyz);
 259 }
 260
 261 void opengl_fill(struct _gfxdevice*dev, gfxline_t*line, gfxcolor_t*color)
 262 {
 263     double z;
 264     dbg("fill");
 265     internal_t*i = (internal_t*)dev->internal;
 266
 267     glColor4f(color->r/255.0, color->g/255.0, color->b/255.0, color->a/255.0);
 268
 269     i->currentz ++;
 270     z = (i->currentz*ZSTEP);
 271     tesselatePolygon(i->tesselator, z, line);
 272
 273     //tesselatePolygon(i->tesselator_line, z, line);
 274 }
 275
 276 typedef struct _gfxhash
 277 {
 278     unsigned char d[16];
 279 } gfxhash_t;
 280
 281 char gfxhash_compare(gfxhash_t*h1, gfxhash_t*h2)
 282 {
 283     return !memcmp(h1->d, h2->d, 16);
 284 }
 285
 286 typedef struct _imgopengl
 287 {
 288     gfxhash_t hash;
 289     GLuint texID;
 290     int width, height;
 291     struct _imgopengl*next;
 292 } imgopengl_t;
 293
 294 imgopengl_t*img2texid = 0;
 295
 296 gfxhash_t gfximage_hash(gfximage_t*img)
 297 {
 298     int t;
 299     int size = img->width*img->height*4;
 300     U8*data = (U8*)img->data;
 301     gfxhash_t hash;
 302     hash_md5(data, size, hash.d);
 303     return hash;
 304 }
 305
 306 imgopengl_t*addTexture(gfximage_t*img)
 307 {
 308     gfxhash_t hash = gfximage_hash(img);
 309     imgopengl_t*i = img2texid;
 310
 311     int width_bits = 0;
 312     int height_bits = 0;
 313     while(1<<width_bits < img->width)
 314         width_bits++;
 315     while(1<<height_bits < img->height)
 316         height_bits++;
 317     int newwidth = 1<<width_bits;
 318     int newheight = 1<<height_bits;
 319
 320     while(i) {
 321         if(gfxhash_compare(&hash, &i->hash) && newwidth==i->width && newheight==i->height) {
 322             return i;
 323         }
 324         i = i->next;
 325     }
 326
 327     GLuint texIDs[1];
 328     glGenTextures(1, texIDs);
 329
 330     i = malloc(sizeof(imgopengl_t));
 331     i->hash = hash;
 332     i->texID = texIDs[0];
 333     i->next = img2texid;
 334     img2texid = i;
 335
 336     i->width = newwidth;
 337     i->height = newheight;
 338
 339     unsigned char*data = malloc(newwidth*newheight*4);
 340     int x,y;
 341     for(y=0;y<img->height;y++) {
 342         for(x=0;x<img->width;x++) {
 343             data[(y*newwidth+x)*4+0] = img->data[y*img->width+x].r;
 344             data[(y*newwidth+x)*4+1] = img->data[y*img->width+x].g;
 345             data[(y*newwidth+x)*4+2] = img->data[y*img->width+x].b;
 346             data[(y*newwidth+x)*4+3] = img->data[y*img->width+x].a;
 347         }
 348         int lastx = img->width - 1;
 349         for(;x<newwidth;x++) {
 350             data[(y*newwidth+x)*4+0] = img->data[y*img->width+lastx].r;
 351             data[(y*newwidth+x)*4+1] = img->data[y*img->width+lastx].g;
 352             data[(y*newwidth+x)*4+2] = img->data[y*img->width+lastx].b;
 353             data[(y*newwidth+x)*4+3] = img->data[y*img->width+lastx].a;
 354         }
 355     }
 356     int lasty = img->height - 1;
 357     for(;y<newheight;y++) {
 358         for(x=0;x<newwidth;x++) {
 359             data[(y*newwidth+x)*4+0] = img->data[lasty*img->width+x].r;
 360             data[(y*newwidth+x)*4+1] = img->data[lasty*img->width+x].g;
 361             data[(y*newwidth+x)*4+2] = img->data[lasty*img->width+x].b;
 362             data[(y*newwidth+x)*4+3] = img->data[lasty*img->width+x].a;
 363         }
 364     }
 365
 366     glEnable(GL_TEXTURE_2D);
 367     glBindTexture(GL_TEXTURE_2D, i->texID);
 368     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, i->width, i->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
 369
 370     return i;
 371 };
 372
 373 void opengl_fillbitmap(struct _gfxdevice*dev, gfxline_t*line, gfximage_t*img, gfxmatrix_t*matrix, gfxcxform_t*cxform)
 374 {
 375     dbg("fillbitmap");
 376     internal_t*i = (internal_t*)dev->internal;
 377     char running = 0;
 378     int len = 0;
 379     double*xyz=0;
 380     gfxline_t*l=0;
 381     glColor4f(1.0,0,0,1.0);
 382
 383     i->currentz ++;
 384
 385     imgopengl_t* txt = addTexture(img);
 386
 387     gfxmatrix_t m2;
 388     gfxmatrix_invert(matrix, &m2);
 389     m2.m00 /= txt->width;
 390     m2.m10 /= txt->width;
 391     m2.tx /= txt->width;
 392     m2.m01 /= txt->height;
 393     m2.m11 /= txt->height;
 394     m2.ty /= txt->height;
 395
 396     glEnable(GL_TEXTURE_2D);
 397     glBindTexture(GL_TEXTURE_2D, txt->texID);
 398     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 399     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 400     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 401     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 402     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 403
 404     gluTessBeginPolygon(i->tesselator_tex, NULL);
 405     l = line;
 406     len = 0;
 407     while(l) {
 408         len++;
 409         l = l->next;
 410     }
 411     xyz = malloc(sizeof(double)*5*len);
 412     l = line;
 413     len = 0;
 414     while(l) {
 415         if(l->type == gfx_moveTo) {
 416             if(running) {
 417                 running = 0;
 418                 gluTessEndContour(i->tesselator_tex);
 419             }
 420         }
 421         if(!running) {
 422             running = 1;
 423             gluTessBeginContour(i->tesselator_tex);
 424         }
 425
 426         xyz[len*5+0] = l->x;
 427         xyz[len*5+1] = l->y;
 428         xyz[len*5+2] = (i->currentz*ZSTEP);
 429         xyz[len*5+3] = 0;
 430         xyz[len*5+4] = 0;
 431         gfxmatrix_transform(&m2, /*src*/&xyz[len*5+0], /*dest*/&xyz[len*5+3]);
 432
 433         gluTessVertex(i->tesselator_tex, &xyz[len*5], &xyz[len*5]);
 434         len++;
 435
 436         l=l->next;
 437     }
 438
 439     if(running) {
 440         running = 0;
 441         gluTessEndContour(i->tesselator_tex);
 442     }
 443     gluTessEndPolygon(i->tesselator_tex);
 444     free(xyz);
 445
 446     glDisable(GL_TEXTURE_2D);
 447 }
 448
 449 void opengl_fillgradient(struct _gfxdevice*dev, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*matrix)
 450 {
 451     dbg("fillgradient");
 452 }
 453
 454 void opengl_addfont(gfxdevice_t*dev, gfxfont_t*font)
 455 {
 456     internal_t*i = (internal_t*)dev->internal;
 457
 458     fontlist_t*last=0,*l = i->fontlist;
 459     while(l) {
 460         last = l;
 461         if(!strcmp((char*)l->font->id, font->id)) {
 462             return; // we already know this font
 463         }
 464         l = l->next;
 465     }
 466     l = (fontlist_t*)rfx_calloc(sizeof(fontlist_t));
 467     l->font = font;
 468     l->next = 0;
 469     if(last) {
 470         last->next = l;
 471     } else {
 472         i->fontlist = l;
 473     }
 474 }
 475
 476 void opengl_drawchar(gfxdevice_t*dev, gfxfont_t*font, int glyphnr, gfxcolor_t*color, gfxmatrix_t*matrix)
 477 {
 478     internal_t*i = (internal_t*)dev->internal;
 479
 480     if(i->font && i->font->id && !strcmp(font->id, i->font->id)) {
 481         // current font is correct
 482     } else {
 483         fontlist_t*l = i->fontlist;
 484         i->font = 0;
 485         while(l) {
 486             if(!strcmp((char*)l->font->id, font->id)) {
 487                 i->font = l->font;
 488                 break;
 489             }
 490             l = l->next;
 491         }
 492         if(i->font == 0) {
 493             fprintf(stderr, "Unknown font id: %s", font->id);
 494             return;
 495         }
 496     }
 497
 498     gfxglyph_t*glyph = &i->font->glyphs[glyphnr];
 499
 500     gfxline_t*line2 = gfxline_clone(glyph->line);
 501     gfxline_transform(line2, matrix);
 502     opengl_fill(dev, line2, color);
 503     gfxline_free(line2);
 504
 505     i->currentz --;
 506
 507     return;
 508 }
 509
 510
 511
 512 void opengl_drawlink(struct _gfxdevice*dev, gfxline_t*line, char*action)
 513 {
 514     dbg("link");
 515 }
 516
 517 void opengl_endpage(struct _gfxdevice*dev)
 518 {
 519     dbg("endpage");
 520 }
 521
 522 int opengl_result_save(struct _gfxresult*gfx, char*filename)
 523 {
 524     dbg("result:save");
 525     return 0;
 526 }
 527 void* opengl_result_get(struct _gfxresult*gfx, char*name)
 528 {
 529     dbg("result:get");
 530     return 0;
 531 }
 532 void opengl_result_destroy(struct _gfxresult*gfx)
 533 {
 534     dbg("result:destroy");
 535     free(gfx);
 536 }
 537
 538 gfxresult_t*opengl_finish(struct _gfxdevice*dev)
 539 {
 540     dbg("finish");
 541     internal_t*i = (internal_t*)dev->internal;
 542     gluDeleteTess(i->tesselator);i->tesselator=0;
 543     gluDeleteTess(i->tesselator_tex);i->tesselator_tex=0;
 544     gfxresult_t*result = (gfxresult_t*)malloc(sizeof(gfxresult_t));
 545     memset(result, 0, sizeof(gfxresult_t));
 546     result->save = opengl_result_save;
 547     result->get = opengl_result_get;
 548     result->destroy = opengl_result_destroy;
 549     return result;
 550 }
 551
 552 void gfxdevice_opengl_init(gfxdevice_t*dev)
 553 {
 554     dbg("init");
 555     internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
 556     memset(dev, 0, sizeof(gfxdevice_t));
 557
 558     dev->name = "opengl";
 559
 560     dev->internal = i;
 561
 562     dev->setparameter = opengl_setparameter;
 563     dev->startpage = opengl_startpage;
 564     dev->startclip = opengl_startclip;
 565     dev->endclip = opengl_endclip;
 566     dev->stroke = opengl_stroke;
 567     dev->fill = opengl_fill;
 568     dev->fillbitmap = opengl_fillbitmap;
 569     dev->fillgradient = opengl_fillgradient;
 570     dev->addfont = opengl_addfont;
 571     dev->drawchar = opengl_drawchar;
 572     dev->drawlink = opengl_drawlink;
 573     dev->endpage = opengl_endpage;
 574     dev->finish = opengl_finish;
 575
 576     i->tesselator = gluNewTess();
 577     gluTessCallback(i->tesselator, GLU_TESS_ERROR, (callbackfunction_t)errorCallback);
 578     gluTessCallback(i->tesselator, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallback);
 579     gluTessCallback(i->tesselator, GLU_TESS_BEGIN, (callbackfunction_t)beginCallback);
 580     gluTessCallback(i->tesselator, GLU_TESS_END, (callbackfunction_t)endCallback);
 581     //gluTessCallback(i->tesselator, GLU_TESS_COMBINE, (callbackfunction_t)combineCallback);
 582
 583     i->tesselator_line = gluNewTess();
 584     gluTessCallback(i->tesselator_line, GLU_TESS_ERROR, (callbackfunction_t)errorCallback);
 585     gluTessCallback(i->tesselator_line, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallback);
 586     gluTessCallback(i->tesselator_line, GLU_TESS_BEGIN, (callbackfunction_t)beginCallback);
 587     gluTessCallback(i->tesselator_line, GLU_TESS_END, (callbackfunction_t)endCallback);
 588     gluTessProperty(i->tesselator_line, GLU_TESS_BOUNDARY_ONLY, 1.0);
 589
 590     i->tesselator_tex = gluNewTess();
 591     gluTessCallback(i->tesselator_tex, GLU_TESS_ERROR, (callbackfunction_t)errorCallback);
 592     gluTessCallback(i->tesselator_tex, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallbackTex);
 593     gluTessCallback(i->tesselator_tex, GLU_TESS_BEGIN, (callbackfunction_t)beginCallback);
 594     gluTessCallback(i->tesselator_tex, GLU_TESS_END, (callbackfunction_t)endCallback);
 595     gluTessCallback(i->tesselator_tex, GLU_TESS_COMBINE, (callbackfunction_t)combineCallbackTex);
 596
 597     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 598 }