git.mutantstargoat.com Git - ld37_one_room/blob - src/texture.cc

   1 #include <math.h>
   2 #include <assert.h>
   3 #include "texture.h"
   4 #include "datamap.h"
   5 #include "image.h"
   6 #include "opengl.h"
   7 #include "imago2.h"
   8 #include "logger.h"
   9
  10 static int glifmt_from_ifmt(unsigned int ifmt);
  11 static int glfmt_from_ifmt(unsigned int ifmt);
  12 static int gltype_from_ifmt(unsigned int ifmt);
  13
  14 static int glifmt_from_imgfmt(Image::Format fmt);
  15
  16 static unsigned int type_to_target(TextureType type);
  17 static TextureType target_to_type(unsigned int targ);
  18
  19 static unsigned int cur_target[8] = {
  20         GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D,
  21         GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D, GL_TEXTURE_2D
  22 };
  23
  24 static unsigned int cube_faces[] = {
  25         GL_TEXTURE_CUBE_MAP_POSITIVE_X,
  26         GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
  27         GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
  28         GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
  29         GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
  30         GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
  31 };
  32
  33
  34 void bind_texture(Texture *tex, int tunit)
  35 {
  36         if(tex) {
  37                 tex->bind(tunit);
  38         } else {
  39                 glActiveTexture(GL_TEXTURE0 + tunit);
  40                 glBindTexture(cur_target[tunit], 0);
  41                 assert(glGetError() == GL_NO_ERROR);
  42                 glActiveTexture(GL_TEXTURE0);
  43         }
  44 }
  45
  46
  47 Image *Texture::default_img;
  48
  49 Texture::Texture()
  50 {
  51         target = 0;
  52         sz[0] = sz[1] = sz[2] = 0;
  53         texfmt = 0;
  54
  55         img = 0;
  56         glGenTextures(1, &id);
  57 }
  58
  59 Texture::~Texture()
  60 {
  61         if(id) {
  62                 glDeleteTextures(1, &id);
  63         }
  64         if(img) {
  65                 delete img;
  66         }
  67 }
  68
  69 void Texture::set_wrapping(unsigned int wrap)
  70 {
  71         if(!target) {
  72                 return;
  73         }
  74
  75         glBindTexture(target, id);
  76         assert(glGetError() == GL_NO_ERROR);
  77         glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap);
  78         glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap);
  79         glTexParameteri(target, GL_TEXTURE_WRAP_R, wrap);
  80 }
  81
  82 void Texture::set_filtering(unsigned int filt)
  83 {
  84         unsigned int mag_filter;
  85
  86         if(!target) {
  87                 return;
  88         }
  89
  90         switch(filt) {
  91         case GL_LINEAR_MIPMAP_NEAREST:
  92         case GL_LINEAR_MIPMAP_LINEAR:
  93                 mag_filter = GL_LINEAR;
  94                 break;
  95
  96         case GL_NEAREST_MIPMAP_NEAREST:
  97         case GL_NEAREST_MIPMAP_LINEAR:
  98                 mag_filter = GL_NEAREST;
  99                 break;
 100
 101         default:
 102                 mag_filter = filt;
 103         }
 104
 105         set_filtering(filt, mag_filter);
 106 }
 107
 108 void Texture::set_filtering(unsigned int min_filt, unsigned int mag_filt)
 109 {
 110         glBindTexture(target, id);
 111         assert(glGetError() == GL_NO_ERROR);
 112         glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filt);
 113         glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mag_filt);
 114 }
 115
 116 unsigned int Texture::get_format() const
 117 {
 118         return texfmt;
 119 }
 120
 121 int Texture::get_size(int dim) const
 122 {
 123         if(dim < 0 || dim >= 3) {
 124                 return 0;
 125         }
 126         return sz[dim];
 127 }
 128
 129 unsigned int Texture::get_id() const
 130 {
 131         return id;
 132 }
 133
 134 TextureType Texture::get_type() const
 135 {
 136         return target_to_type(target);
 137 }
 138
 139 void Texture::bind(int tex_unit) const
 140 {
 141         glActiveTexture(GL_TEXTURE0 + tex_unit);
 142         glBindTexture(target, id);
 143         assert(glGetError() == GL_NO_ERROR);
 144         glActiveTexture(GL_TEXTURE0);
 145
 146         cur_target[tex_unit] = target;
 147 }
 148
 149
 150 void Texture::create(int xsz, int ysz, TextureType textype, unsigned int ifmt)
 151 {
 152         if(textype == TEX_CUBE && xsz != ysz) {
 153                 error_log("trying to create cubemap with different width and height (%dx%d)\n", xsz, ysz);
 154                 return;
 155         }
 156
 157         int fmt = glfmt_from_ifmt(ifmt);
 158         int type = gltype_from_ifmt(ifmt);
 159
 160         target = type_to_target(textype);
 161
 162         glBindTexture(target, id);
 163         assert(glGetError() == GL_NO_ERROR);
 164         glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 165         glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 166
 167         switch(type) {
 168         case TEX_2D:
 169                 glTexImage2D(GL_TEXTURE_2D, 0, glifmt_from_ifmt(ifmt), xsz, ysz, 0, fmt, type, 0);
 170                 break;
 171
 172         case TEX_CUBE:
 173                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 174                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 175                 glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 176                 for(int i=0; i<6; i++) {
 177                         glTexImage2D(cube_faces[i], 0, ifmt, xsz, ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
 178                 }
 179                 break;
 180         }
 181
 182         sz[0] = xsz;
 183         sz[1] = ysz;
 184         texfmt = ifmt;
 185 }
 186
 187 #define DEF_IMAGE_SIZE  64
 188 void Texture::create_default(TextureType type)
 189 {
 190         if(!default_img) {
 191                 default_img = new Image;
 192                 default_img->create(DEF_IMAGE_SIZE, DEF_IMAGE_SIZE, Image::FMT_RGBA);
 193
 194                 unsigned char *pixels = (unsigned char*)default_img->get_pixels();
 195                 for(int i=0; i<DEF_IMAGE_SIZE; i++) {
 196                         for(int j=0; j<DEF_IMAGE_SIZE; j++) {
 197                                 bool chess = ((i >> 3) & 1) == ((j >> 3) & 1);
 198                                 pixels[0] = chess ? 255 : 32;
 199                                 pixels[1] = 64;
 200                                 pixels[2] = chess ? 32 : 255;
 201                                 pixels[3] = 255;
 202                                 pixels += 4;
 203                         }
 204                 }
 205         }
 206
 207         switch(type) {
 208         case TEX_2D:
 209                 set_image(*default_img);
 210                 break;
 211
 212         case TEX_CUBE:
 213                 for(int i=0; i<6; i++) {
 214                         set_image(*default_img, i);
 215                 }
 216                 break;
 217         }
 218 }
 219
 220 void Texture::set_image(const Image &img, int idx)
 221 {
 222         if(idx >= 0 && idx < 6) {
 223                 set_image_cube(img, idx);
 224         } else {
 225                 if(!set_image_cube(img)) {
 226                         set_image_2d(img);
 227                 }
 228         }
 229 }
 230
 231 void Texture::set_image_2d(const Image &img)
 232 {
 233         texfmt = glifmt_from_imgfmt(img.get_format());
 234         unsigned int fmt = glfmt_from_ifmt(texfmt);
 235         unsigned int type = gltype_from_ifmt(texfmt);
 236
 237         sz[0] = img.get_width();
 238         sz[1] = img.get_height();
 239
 240         target = GL_TEXTURE_2D;
 241         glBindTexture(target, id);
 242         assert(glGetError() == GL_NO_ERROR);
 243         glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 244         glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 245         glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_REPEAT);
 246         glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_REPEAT);
 247
 248         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 249
 250 #ifdef __GLEW_H__
 251         if(GLEW_SGIS_generate_mipmap) {
 252                 glTexParameteri(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
 253 #endif
 254                 glTexImage2D(target, 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
 255 #ifdef __GLEW_H__
 256         } else {
 257                 gluBuild2DMipmaps(target, texfmt, sz[0], sz[1], fmt, type, img.get_pixels());
 258         }
 259 #endif
 260
 261 #ifdef GL_ES_VERSION_2_0
 262         glGenerateMipmap(target);
 263 #endif
 264 }
 265
 266 bool Texture::set_image_cube(const Image &img, int idx)
 267 {
 268         unsigned int err;
 269         if(idx < 0 || idx >= 6) {
 270                 return false;
 271         }
 272
 273         texfmt = glifmt_from_imgfmt(img.get_format());
 274         unsigned int fmt = glfmt_from_ifmt(texfmt);
 275         unsigned int type = gltype_from_ifmt(texfmt);
 276
 277         sz[0] = img.get_width();
 278         sz[1] = img.get_height();
 279
 280         target = GL_TEXTURE_CUBE_MAP;
 281         glBindTexture(target, id);
 282         if((err = glGetError()) == GL_INVALID_OPERATION) {
 283                 return false;   // probably not a cubemap
 284         }
 285         assert(err == GL_NO_ERROR);
 286         glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 287         glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 288         glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 289         glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 290         glTexParameteri(target, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 291
 292         glTexImage2D(cube_faces[idx], 0, texfmt, sz[0], sz[1], 0, fmt, type, img.get_pixels());
 293         return true;
 294 }
 295
 296 bool Texture::set_image_cube(const Image &img)
 297 {
 298         static const float one_third = 1.0 / 3.0;
 299         static const float two_thirds = 2.0 / 3.0;
 300         static const float hcross[2][6] = {
 301                 {0.5, 0.0, 0.25, 0.25, 0.25, 0.75}, {one_third, one_third, 0.0, two_thirds, one_third, one_third} };
 302         static const float vcross[2][6] = {
 303                 {two_thirds, 0.0, one_third, one_third, one_third, one_third}, {0.25, 0.25, 0.0, 0.5, 0.25, 0.75} };
 304         static const float hsix[2][6] = {
 305                 {0.0, 0.0, one_third, one_third, two_thirds, two_thirds}, {0.0, 0.5, 0.0, 0.5, 0.0, 0.5} };
 306
 307         int xsz = img.get_width();
 308         int ysz = img.get_height();
 309
 310         if((xsz << 8) / 4 == (ysz << 8) / 3) {
 311                 // horizontal cross, assume the vertical bit is center-left
 312                 return set_cube_multi(img, hcross[0], hcross[1], xsz / 4);
 313         }
 314         if((xsz << 8) / 3 == (ysz << 8) / 4) {
 315                 // vertical cross, assume the horizontal bit is center-top (180-rotated image 5)
 316                 return set_cube_multi(img, vcross[0], vcross[1], ysz / 4, (1 << 5));
 317         }
 318         if((xsz << 8) / 3 == (ysz << 8) / 2) {
 319                 // horizontal sixpack
 320                 return set_cube_multi(img, hsix[0], hsix[1], ysz / 2);
 321         }
 322
 323         return false;
 324 }
 325
 326
 327 bool Texture::load(const char *fname)
 328 {
 329         Image img;
 330         if(!img.load(fname)) {
 331                 error_log("failed to load 2D texture: %s\n", fname);
 332                 return false;
 333         }
 334         set_image(img);
 335
 336         info_log("loaded 2D texture: %s\n", fname);
 337         return true;
 338 }
 339
 340 bool Texture::load_cube(const char *fname)
 341 {
 342         Image img;
 343         if(!img.load(fname)) {
 344                 return false;
 345         }
 346         return set_image_cube(img);
 347 }
 348
 349 bool Texture::set_cube_multi(const Image &img, const float *xoffsets, const float *yoffsets, float sz,
 350                 unsigned int rotmask)
 351 {
 352         for(int i=0; i<6; i++) {
 353                 Image face;
 354
 355                 int xoffs = xoffsets[i] * img.get_width();
 356                 int yoffs = yoffsets[i] * img.get_height();
 357
 358                 if(!face.set_pixels(sz, sz, img.get_pixels(), xoffs, yoffs, img.get_width(), img.get_format())) {
 359                         return false;
 360                 }
 361
 362                 if(rotmask & (1 << i)) {
 363                         face.rotate_180();
 364                 }
 365                 set_image_cube(face, i);
 366         }
 367         return true;
 368 }
 369
 370 static int glifmt_from_ifmt(unsigned int ifmt)
 371 {
 372 #ifdef GL_ES_VERSION_2_0
 373         switch(ifmt) {
 374         case GL_LUMINANCE16F_ARB:
 375         case GL_LUMINANCE32F_ARB:
 376                 ifmt = GL_LUMINANCE;
 377                 break;
 378
 379         case GL_RGB16F:
 380         case GL_RGB32F:
 381                 ifmt = GL_RGB;
 382                 break;
 383
 384         case GL_RGBA16F:
 385         case GL_RGBA32F:
 386                 ifmt = GL_RGBA;
 387                 break;
 388
 389         default:
 390                 break;
 391         }
 392 #endif
 393         return ifmt;    // by default just pass it through...
 394 }
 395
 396 static int glfmt_from_ifmt(unsigned int ifmt)
 397 {
 398         switch(ifmt) {
 399         case GL_LUMINANCE16F_ARB:
 400         case GL_LUMINANCE32F_ARB:
 401         case GL_SLUMINANCE:
 402                 return GL_LUMINANCE;
 403
 404         case GL_RGB16F:
 405         case GL_RGB32F:
 406         case GL_SRGB:
 407                 return GL_RGB;
 408
 409         case GL_RGBA16F:
 410         case GL_RGBA32F:
 411         case GL_SRGB_ALPHA:
 412                 return GL_RGBA;
 413
 414         default:
 415                 break;
 416         }
 417         return ifmt;
 418 }
 419
 420 static int gltype_from_ifmt(unsigned int ifmt)
 421 {
 422         switch(ifmt) {
 423         case GL_RGB16F:
 424         case GL_RGBA16F:
 425         case GL_LUMINANCE16F_ARB:
 426 #ifdef GL_ES_VERSION_2_0
 427                 return GL_HALF_FLOAT_OES;
 428 #endif
 429         case GL_RGB32F:
 430         case GL_RGBA32F:
 431         case GL_LUMINANCE32F_ARB:
 432                 return GL_FLOAT;
 433
 434         default:
 435                 break;
 436         }
 437         return GL_UNSIGNED_BYTE;
 438 }
 439
 440 static int glifmt_from_imgfmt(Image::Format fmt)
 441 {
 442         switch(fmt) {
 443         case Image::FMT_GREY:
 444                 return GL_SLUMINANCE;
 445         case Image::FMT_GREY_FLOAT:
 446                 return GL_LUMINANCE16F_ARB;
 447         case Image::FMT_RGB:
 448                 return GL_SRGB;
 449         case Image::FMT_RGB_FLOAT:
 450                 return GL_RGB16F;
 451         case Image::FMT_RGBA:
 452                 return GL_SRGB_ALPHA;
 453         case Image::FMT_RGBA_FLOAT:
 454                 return GL_RGBA16F;
 455         default:
 456                 break;
 457         }
 458         return 0;
 459 }
 460
 461 static unsigned int type_to_target(TextureType type)
 462 {
 463         return type == TEX_CUBE ? GL_TEXTURE_CUBE_MAP : GL_TEXTURE_2D;
 464 }
 465
 466 static TextureType target_to_type(unsigned int targ)
 467 {
 468         return targ == GL_TEXTURE_CUBE_MAP ? TEX_CUBE : TEX_2D;
 469 }
 470
 471 // ---- TextureSet ----
 472 TextureSet::TextureSet()
 473         : DataSet<Texture*>(create_tex, load_tex, done_tex, free_tex)
 474 {
 475 }
 476
 477 Texture *TextureSet::get_texture(const char *name, TextureType type, const DataMap *dmap) const
 478 {
 479         char *fname;
 480         int nsize = dmap ? dmap->path_size(name) : 0;
 481         if(nsize) {
 482                 fname = (char*)alloca(nsize);
 483                 dmap->lookup(name, fname, nsize);
 484                 //debug_log("texture lookup: %s -> %s\n", name, fname);
 485         } else {
 486                 fname = (char*)name;
 487                 //debug_log("texture lookup failed, using: %s\n", fname);
 488         }
 489
 490         std::map<std::string, Texture*>::const_iterator iter = data.find(fname);
 491         if(iter != data.end()) {
 492                 return iter->second;
 493         }
 494
 495         Texture *res = create();
 496         data[fname] = res;
 497         res->create_default(type);
 498         resman_lookup(rman, fname, res);
 499         return res;
 500 }
 501
 502 // static callbacks
 503
 504 Texture *TextureSet::create_tex()
 505 {
 506         return new Texture;
 507 }
 508
 509 bool TextureSet::load_tex(Texture *tex, const char *fname)
 510 {
 511         Image *img = new Image;
 512         img->name = fname;
 513         if(!img->load(fname)) {
 514                 delete img;
 515                 return false;
 516         }
 517
 518         delete tex->img;
 519         tex->img = img;
 520
 521         return true;
 522 }
 523
 524 bool TextureSet::done_tex(Texture *tex)
 525 {
 526         //debug_log("TextureSet::done_tex [%s]\n", tex->img->name.c_str());
 527         if(!tex->img) {
 528                 return false;
 529         }
 530
 531         tex->set_image(*tex->img);
 532         return true;
 533 }
 534
 535 void TextureSet::free_tex(Texture *tex)
 536 {
 537         delete tex;
 538 }