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 (1/32.0)
  20 //#define ZSTEP (1/4.0)
  21
  22 typedef struct _fontlist {
  23     gfxfont_t*font;
  24     struct _fontlist*next;
  25 } fontlist_t;
  26
  27 typedef struct _internal {
  28     gfxfont_t*font;
  29     char*fontid;
  30     fontlist_t* fontlist;
  31     int width, height;
  32     int currentz;
  33
  34     int config_polygonoutlines;
  35
  36     GLUtesselator *tesselator;
  37     GLUtesselator *tesselator_line;
  38     GLUtesselator *tesselator_tex;
  39 } internal_t;
  40
  41 static int verbose = 0;
  42 static void dbg(char*format, ...)
  43 {
  44     char buf[1024];
  45     int l;
  46     va_list arglist;
  47     if(!verbose)
  48         return;
  49     va_start(arglist, format);
  50     vsprintf(buf, format, arglist);
  51     va_end(arglist);
  52     l = strlen(buf);
  53     while(l && buf[l-1]=='\n') {
  54         buf[l-1] = 0;
  55         l--;
  56     }
  57     printf("(device-opengl) %s\n", buf);
  58     fflush(stdout);
  59 }
  60
  61 #ifndef CALLBACK
  62 #define CALLBACK
  63 #endif
  64
  65 typedef void(*callbackfunction_t)();
  66
  67 void CALLBACK errorCallback(GLenum errorCode)
  68 {
  69    const GLubyte *estring;
  70    estring = gluErrorString(errorCode);
  71    printf("Tessellation Error: %s\n", estring);
  72    exit(0);
  73 }
  74 void CALLBACK beginCallback(GLenum which)
  75 {
  76     glBegin(which);
  77 }
  78 void CALLBACK endCallback(void)
  79 {
  80     glEnd();
  81 }
  82 void CALLBACK vertexCallback(GLvoid *vertex)
  83 {
  84    double*xyz = (GLdouble*)vertex;
  85    glVertex3d(xyz[0],xyz[1],xyz[2]);
  86 }
  87 void CALLBACK combineCallback(GLdouble coords[3], GLdouble *data[4], GLfloat w[4], GLdouble **out)
  88 {
  89    GLdouble *vertex;
  90    vertex = (GLdouble *) malloc(6 * sizeof(GLdouble));
  91    vertex[0] = coords[0];
  92    vertex[1] = coords[1];
  93    vertex[2] = coords[2];
  94    *out = vertex;
  95 }
  96 void CALLBACK vertexCallbackTex(GLvoid *vertex)
  97 {
  98    double*v = (GLdouble*)vertex;
  99    glTexCoord2f(v[3],v[4]);
 100    glVertex3d(v[0],v[1],v[2]);
 101 }
 102 void CALLBACK combineCallbackTex(GLdouble coords[3], GLdouble *data[4], GLfloat w[4], GLdouble **out)
 103 {
 104    GLdouble *vertex;
 105    vertex = (GLdouble *) malloc(5 * sizeof(GLdouble));
 106    vertex[0] = coords[0];
 107    vertex[1] = coords[1];
 108    vertex[2] = coords[2];
 109    if(data[2] && data[3]) {
 110        vertex[3] = w[0]*data[0][3] + w[1]*data[1][3] + w[2]*data[2][3] + w[3]*data[3][3];
 111        vertex[4] = w[0]*data[0][4] + w[1]*data[1][4] + w[2]*data[2][4] + w[3]*data[3][4];
 112    } else {
 113        vertex[3] = w[0]*data[0][3] + w[1]*data[1][3];
 114        vertex[4] = w[0]*data[0][4] + w[1]*data[1][4];
 115    }
 116    *out = vertex;
 117 }
 118
 119 int opengl_setparameter(struct _gfxdevice*dev, const char*key, const char*value)
 120 {
 121     internal_t*i = (internal_t*)dev->internal;
 122     dbg("setparameter %s=%s", key, value);
 123     if(!strcmp(key, "polygonoutlines")) {
 124         i->config_polygonoutlines = atoi(value);
 125     }
 126     return 0;
 127 }
 128
 129 void opengl_startpage(struct _gfxdevice*dev, int width, int height)
 130 {
 131     dbg("startpage %d %d", width, height);
 132     internal_t*i = (internal_t*)dev->internal;
 133     i->width = width;
 134     i->height = height;
 135     i->currentz = 0;
 136 }
 137
 138 void opengl_startclip(struct _gfxdevice*dev, gfxline_t*line)
 139 {
 140     dbg("startclip");
 141 }
 142
 143 void opengl_endclip(struct _gfxdevice*dev)
 144 {
 145     dbg("endclip");
 146 }
 147
 148 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)
 149 {
 150     dbg("stroke");
 151     internal_t*i = (internal_t*)dev->internal;
 152     i->currentz++;
 153     char running = 0;
 154     gfxline_t*l=0;
 155
 156     glColor4f(color->r/255.0, color->g/255.0, color->b/255.0, color->a/255.0);
 157
 158     //glLineWidth(width*64);
 159     if(width <= 0) {
 160         width = 1.0;
 161     }
 162     glLineWidth(width);
 163     double z = i->currentz*ZSTEP;
 164
 165     glPolygonOffset(0.0, 500.0);
 166
 167     l = line;
 168     while(l) {
 169         if(l->type == gfx_moveTo) {
 170             if(running) {
 171                 running = 0;
 172                 glEnd();
 173             }
 174         }
 175         if(!running) {
 176             running = 1;
 177             glBegin(GL_LINE_STRIP);
 178         }
 179         glVertex3d(l->x, l->y, z);
 180         l=l->next;
 181     }
 182     if(running) {
 183         running = 0;
 184         glEnd();
 185     }
 186     glLineWidth(1.0);
 187 }
 188
 189 #define SPLINE_SUBDIVISION 2
 190
 191 void tesselatePolygon(GLUtesselator*tesselator, double z, gfxline_t*line)
 192 {
 193     int len = 0;
 194     gfxline_t*l=0;
 195     double lastx=0,lasty=0;
 196     double*xyz=0;
 197     char running = 0;
 198     gluTessBeginPolygon(tesselator, NULL);
 199     l = line;
 200     len = 0;
 201     while(l) {
 202         if(l->type == gfx_splineTo) {
 203             double c = sqrt(abs(l->x-2*l->sx+lastx) + abs(l->y-2*l->sy+lasty))*SPLINE_SUBDIVISION;
 204             int steps = (int)c;
 205             if(steps<1) steps = 1;
 206             len += steps;
 207         } else {
 208             len++;
 209         }
 210         l = l->next;
 211     }
 212     //printf("full len:%d\n", len);
 213     xyz = malloc(sizeof(double)*3*len);
 214     l = line;
 215     len = 0;
 216     while(l) {
 217         if(l->type == gfx_moveTo) {
 218             if(running) {
 219                 running = 0;
 220                 gluTessEndContour(tesselator);
 221             }
 222         }
 223         if(!running) {
 224             running = 1;
 225             gluTessBeginContour(tesselator);
 226         }
 227
 228         if(l->type == gfx_splineTo) {
 229             int j;
 230             double c = sqrt(abs(l->x-2*l->sx+lastx) + abs(l->y-2*l->sy+lasty))*SPLINE_SUBDIVISION;
 231             int steps = (int)c;
 232             if(steps<1) steps = 1;
 233             //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);
 234             //printf("%f %f %f\n", lastx, l->sx, l->x);
 235             //printf("%f %f %f\n", lasty, l->sy, l->y);
 236             for(j=1;j<=steps;j++) {
 237                 //printf("%d\n", j);
 238                 double t = (double)j / (double)steps;
 239                 xyz[len*3+0] = lastx*(1-t)*(1-t) + 2*l->sx*(1-t)*t + l->x*t*t;
 240                 xyz[len*3+1] = lasty*(1-t)*(1-t) + 2*l->sy*(1-t)*t + l->y*t*t;
 241                 xyz[len*3+2] = z;
 242                 gluTessVertex(tesselator, &xyz[len*3], &xyz[len*3]);
 243                 len++;
 244             }
 245             //printf("%d\n", len);
 246         } else {
 247             xyz[len*3+0] = l->x;
 248             xyz[len*3+1] = l->y;
 249             xyz[len*3+2] = z;
 250             gluTessVertex(tesselator, &xyz[len*3], &xyz[len*3]);
 251             len++;
 252         }
 253         lastx = l->x;
 254         lasty = l->y;
 255
 256         l=l->next;
 257     }
 258     if(running) {
 259         running = 0;
 260         gluTessEndContour(tesselator);
 261     }
 262     gluTessEndPolygon(tesselator);
 263     free(xyz);
 264 }
 265
 266 void opengl_fill(struct _gfxdevice*dev, gfxline_t*line, gfxcolor_t*color)
 267 {
 268     double z;
 269     dbg("fill %02x%02x%02x%02x", color->a, color->r, color->g, color->b);
 270     internal_t*i = (internal_t*)dev->internal;
 271
 272     glDisable(GL_TEXTURE_2D);
 273     glColor4f(color->r/255.0, color->g/255.0, color->b/255.0, color->a/255.0);
 274
 275     i->currentz ++;
 276     z = (i->currentz*ZSTEP);
 277     tesselatePolygon(i->tesselator, z, line);
 278
 279     //tesselatePolygon(i->tesselator_line, z, line);
 280 }
 281
 282 typedef struct _gfxhash
 283 {
 284     unsigned char d[16];
 285 } gfxhash_t;
 286
 287 char gfxhash_compare(gfxhash_t*h1, gfxhash_t*h2)
 288 {
 289     return !memcmp(h1->d, h2->d, 16);
 290 }
 291
 292 typedef struct _imgopengl
 293 {
 294     gfxhash_t hash;
 295     GLuint texID;
 296     int width, height;
 297     struct _imgopengl*next;
 298 } imgopengl_t;
 299
 300 imgopengl_t*img2texid = 0;
 301
 302 gfxhash_t gfximage_hash(gfximage_t*img)
 303 {
 304     int t;
 305     int size = img->width*img->height*4;
 306     U8*data = (U8*)img->data;
 307     gfxhash_t hash;
 308     hash_md5(data, size, hash.d);
 309     return hash;
 310 }
 311
 312 imgopengl_t*addTexture(gfximage_t*img)
 313 {
 314     gfxhash_t hash = gfximage_hash(img);
 315     imgopengl_t*i = img2texid;
 316
 317     int width_bits = 0;
 318     int height_bits = 0;
 319     while(1<<width_bits < img->width)
 320         width_bits++;
 321     while(1<<height_bits < img->height)
 322         height_bits++;
 323     int newwidth = 1<<width_bits;
 324     int newheight = 1<<height_bits;
 325
 326     while(i) {
 327         if(gfxhash_compare(&hash, &i->hash) && newwidth==i->width && newheight==i->height) {
 328             return i;
 329         }
 330         i = i->next;
 331     }
 332
 333     GLuint texIDs[1];
 334     glGenTextures(1, texIDs);
 335
 336     i = malloc(sizeof(imgopengl_t));
 337     i->hash = hash;
 338     i->texID = texIDs[0];
 339     i->next = img2texid;
 340     img2texid = i;
 341
 342     i->width = newwidth;
 343     i->height = newheight;
 344
 345     unsigned char*data = malloc(newwidth*newheight*4);
 346     int x,y;
 347     for(y=0;y<img->height;y++) {
 348         for(x=0;x<img->width;x++) {
 349             data[(y*newwidth+x)*4+0] = img->data[y*img->width+x].r;
 350             data[(y*newwidth+x)*4+1] = img->data[y*img->width+x].g;
 351             data[(y*newwidth+x)*4+2] = img->data[y*img->width+x].b;
 352             data[(y*newwidth+x)*4+3] = img->data[y*img->width+x].a;
 353         }
 354         int lastx = img->width - 1;
 355         for(;x<newwidth;x++) {
 356             data[(y*newwidth+x)*4+0] = img->data[y*img->width+lastx].r;
 357             data[(y*newwidth+x)*4+1] = img->data[y*img->width+lastx].g;
 358             data[(y*newwidth+x)*4+2] = img->data[y*img->width+lastx].b;
 359             data[(y*newwidth+x)*4+3] = img->data[y*img->width+lastx].a;
 360         }
 361     }
 362     int lasty = img->height - 1;
 363     for(;y<newheight;y++) {
 364         for(x=0;x<newwidth;x++) {
 365             data[(y*newwidth+x)*4+0] = img->data[lasty*img->width+x].r;
 366             data[(y*newwidth+x)*4+1] = img->data[lasty*img->width+x].g;
 367             data[(y*newwidth+x)*4+2] = img->data[lasty*img->width+x].b;
 368             data[(y*newwidth+x)*4+3] = img->data[lasty*img->width+x].a;
 369         }
 370     }
 371
 372     glEnable(GL_TEXTURE_2D);
 373     glBindTexture(GL_TEXTURE_2D, i->texID);
 374     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, i->width, i->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
 375
 376     return i;
 377 };
 378
 379 void opengl_fillbitmap(struct _gfxdevice*dev, gfxline_t*line, gfximage_t*img, gfxmatrix_t*matrix, gfxcxform_t*cxform)
 380 {
 381     dbg("fillbitmap");
 382     internal_t*i = (internal_t*)dev->internal;
 383     char running = 0;
 384     int len = 0;
 385     double*xyz=0;
 386     gfxline_t*l=0;
 387     glColor4f(1.0,0,0.7,1.0);
 388
 389     i->currentz ++;
 390
 391     imgopengl_t* txt = addTexture(img);
 392
 393     gfxmatrix_t m2;
 394     gfxmatrix_invert(matrix, &m2);
 395     m2.m00 /= txt->width;
 396     m2.m10 /= txt->width;
 397     m2.tx /= txt->width;
 398     m2.m01 /= txt->height;
 399     m2.m11 /= txt->height;
 400     m2.ty /= txt->height;
 401
 402     glEnable(GL_TEXTURE_2D);
 403     glBindTexture(GL_TEXTURE_2D, txt->texID);
 404     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 405     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 406     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 407     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 408     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 409
 410     gluTessBeginPolygon(i->tesselator_tex, NULL);
 411     l = line;
 412     len = 0;
 413     while(l) {
 414         len++;
 415         l = l->next;
 416     }
 417     xyz = malloc(sizeof(double)*5*len);
 418     l = line;
 419     len = 0;
 420     while(l) {
 421         if(l->type == gfx_moveTo) {
 422             if(running) {
 423                 running = 0;
 424                 gluTessEndContour(i->tesselator_tex);
 425             }
 426         }
 427         if(!running) {
 428             running = 1;
 429             gluTessBeginContour(i->tesselator_tex);
 430         }
 431
 432         xyz[len*5+0] = l->x;
 433         xyz[len*5+1] = l->y;
 434         xyz[len*5+2] = (i->currentz*ZSTEP);
 435         xyz[len*5+3] = 0;
 436         xyz[len*5+4] = 0;
 437         gfxmatrix_transform(&m2, /*src*/&xyz[len*5+0], /*dest*/&xyz[len*5+3]);
 438
 439         gluTessVertex(i->tesselator_tex, &xyz[len*5], &xyz[len*5]);
 440         len++;
 441
 442         l=l->next;
 443     }
 444
 445     if(running) {
 446         running = 0;
 447         gluTessEndContour(i->tesselator_tex);
 448     }
 449     gluTessEndPolygon(i->tesselator_tex);
 450     free(xyz);
 451
 452     glDisable(GL_TEXTURE_2D);
 453 }
 454
 455 void opengl_fillgradient(struct _gfxdevice*dev, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*matrix)
 456 {
 457     dbg("fillgradient");
 458 }
 459
 460 void opengl_addfont(gfxdevice_t*dev, gfxfont_t*font)
 461 {
 462     internal_t*i = (internal_t*)dev->internal;
 463
 464     fontlist_t*last=0,*l = i->fontlist;
 465     while(l) {
 466         last = l;
 467         if(!strcmp((char*)l->font->id, font->id)) {
 468             return; // we already know this font
 469         }
 470         l = l->next;
 471     }
 472     l = (fontlist_t*)rfx_calloc(sizeof(fontlist_t));
 473     l->font = font;
 474     l->next = 0;
 475     if(last) {
 476         last->next = l;
 477     } else {
 478         i->fontlist = l;
 479     }
 480 }
 481
 482 void opengl_drawchar(gfxdevice_t*dev, gfxfont_t*font, int glyphnr, gfxcolor_t*color, gfxmatrix_t*matrix)
 483 {
 484     internal_t*i = (internal_t*)dev->internal;
 485     if(!font)
 486         return;
 487
 488     if(i->font && i->font->id && !strcmp(font->id, i->font->id)) {
 489         // current font is correct
 490     } else {
 491         fontlist_t*l = i->fontlist;
 492         i->font = 0;
 493         while(l) {
 494             if(!strcmp((char*)l->font->id, font->id)) {
 495                 i->font = l->font;
 496                 break;
 497             }
 498             l = l->next;
 499         }
 500         if(i->font == 0) {
 501             opengl_addfont(dev, font);
 502             i->font = font;
 503             //fprintf(stderr, "Unknown font id: %s", font->id);
 504             //return;
 505         }
 506     }
 507
 508     gfxglyph_t*glyph = &i->font->glyphs[glyphnr];
 509
 510     gfxline_t*line2 = gfxline_clone(glyph->line);
 511     gfxline_transform(line2, matrix);
 512     opengl_fill(dev, line2, color);
 513     gfxline_free(line2);
 514
 515     i->currentz --;
 516
 517     return;
 518 }
 519
 520
 521
 522 void opengl_drawlink(struct _gfxdevice*dev, gfxline_t*line, const char*action)
 523 {
 524     dbg("link");
 525 }
 526
 527 void opengl_endpage(struct _gfxdevice*dev)
 528 {
 529     dbg("endpage");
 530 }
 531
 532 int opengl_result_save(struct _gfxresult*gfx, const char*filename)
 533 {
 534     dbg("result:save");
 535     return 0;
 536 }
 537 void* opengl_result_get(struct _gfxresult*gfx, const char*name)
 538 {
 539     dbg("result:get");
 540     return 0;
 541 }
 542 void opengl_result_destroy(struct _gfxresult*gfx)
 543 {
 544     dbg("result:destroy");
 545     free(gfx);
 546 }
 547
 548 gfxresult_t*opengl_finish(struct _gfxdevice*dev)
 549 {
 550     dbg("finish");
 551     internal_t*i = (internal_t*)dev->internal;
 552     gluDeleteTess(i->tesselator);i->tesselator=0;
 553     gluDeleteTess(i->tesselator_tex);i->tesselator_tex=0;
 554     gfxresult_t*result = (gfxresult_t*)malloc(sizeof(gfxresult_t));
 555     memset(result, 0, sizeof(gfxresult_t));
 556     result->save = opengl_result_save;
 557     result->get = opengl_result_get;
 558     result->destroy = opengl_result_destroy;
 559     return result;
 560 }
 561
 562 void gfxdevice_opengl_init(gfxdevice_t*dev)
 563 {
 564     dbg("init");
 565     internal_t*i = (internal_t*)rfx_calloc(sizeof(internal_t));
 566     memset(dev, 0, sizeof(gfxdevice_t));
 567
 568     dev->name = "opengl";
 569
 570     dev->internal = i;
 571
 572     dev->setparameter = opengl_setparameter;
 573     dev->startpage = opengl_startpage;
 574     dev->startclip = opengl_startclip;
 575     dev->endclip = opengl_endclip;
 576     dev->stroke = opengl_stroke;
 577     dev->fill = opengl_fill;
 578     dev->fillbitmap = opengl_fillbitmap;
 579     dev->fillgradient = opengl_fillgradient;
 580     dev->addfont = opengl_addfont;
 581     dev->drawchar = opengl_drawchar;
 582     dev->drawlink = opengl_drawlink;
 583     dev->endpage = opengl_endpage;
 584     dev->finish = opengl_finish;
 585
 586     i->tesselator = gluNewTess();
 587     gluTessCallback(i->tesselator, GLU_TESS_ERROR, (callbackfunction_t)errorCallback);
 588     gluTessCallback(i->tesselator, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallback);
 589     gluTessCallback(i->tesselator, GLU_TESS_BEGIN, (callbackfunction_t)beginCallback);
 590     gluTessCallback(i->tesselator, GLU_TESS_END, (callbackfunction_t)endCallback);
 591     gluTessCallback(i->tesselator, GLU_TESS_COMBINE, (callbackfunction_t)combineCallback);
 592
 593     i->tesselator_line = gluNewTess();
 594     gluTessCallback(i->tesselator_line, GLU_TESS_ERROR, (callbackfunction_t)errorCallback);
 595     gluTessCallback(i->tesselator_line, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallback);
 596     gluTessCallback(i->tesselator_line, GLU_TESS_BEGIN, (callbackfunction_t)beginCallback);
 597     gluTessCallback(i->tesselator_line, GLU_TESS_END, (callbackfunction_t)endCallback);
 598     gluTessProperty(i->tesselator_line, GLU_TESS_BOUNDARY_ONLY, 1.0);
 599
 600     i->tesselator_tex = gluNewTess();
 601     gluTessCallback(i->tesselator_tex, GLU_TESS_ERROR, (callbackfunction_t)errorCallback);
 602     gluTessCallback(i->tesselator_tex, GLU_TESS_VERTEX, (callbackfunction_t)vertexCallbackTex);
 603     gluTessCallback(i->tesselator_tex, GLU_TESS_BEGIN, (callbackfunction_t)beginCallback);
 604     gluTessCallback(i->tesselator_tex, GLU_TESS_END, (callbackfunction_t)endCallback);
 605     gluTessCallback(i->tesselator_tex, GLU_TESS_COMBINE, (callbackfunction_t)combineCallbackTex);
 606
 607     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 608 }