source/texture.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_shadow.h>
   3 #include <msp/gl/extensions/arb_texture_swizzle.h>
   4 #include <msp/gl/extensions/ext_framebuffer_object.h>
   5 #include <msp/gl/extensions/ext_texture3d.h>
   6 #include <msp/gl/extensions/ext_texture_filter_anisotropic.h>
   7 #include <msp/gl/extensions/sgis_generate_mipmap.h>
   8 #include <msp/io/memory.h>
   9 #include <msp/strings/format.h>
  10 #include "error.h"
  11 #include "resourcemanager.h"
  12 #include "resources.h"
  13 #include "texture.h"
  14 #include "texunit.h"
  15
  16 using namespace std;
  17
  18 namespace Msp {
  19 namespace GL {
  20
  21 void operator>>(const LexicalConverter &c, TextureFilter &tf)
  22 {
  23         if(c.get()=="NEAREST")
  24                 tf = NEAREST;
  25         else if(c.get()=="LINEAR")
  26                 tf = LINEAR;
  27         else if(c.get()=="NEAREST_MIPMAP_NEAREST")
  28                 tf = NEAREST_MIPMAP_NEAREST;
  29         else if(c.get()=="NEAREST_MIPMAP_LINEAR")
  30                 tf = NEAREST_MIPMAP_LINEAR;
  31         else if(c.get()=="LINEAR_MIPMAP_NEAREST")
  32                 tf = LINEAR_MIPMAP_NEAREST;
  33         else if(c.get()=="LINEAR_MIPMAP_LINEAR")
  34                 tf = LINEAR_MIPMAP_LINEAR;
  35         else
  36                 throw lexical_error(format("conversion of '%s' to TextureFilter", c.get()));
  37 }
  38
  39
  40 void operator>>(const LexicalConverter &c, TextureWrap &tw)
  41 {
  42         if(c.get()=="REPEAT")
  43                 tw = REPEAT;
  44         else if(c.get()=="CLAMP_TO_EDGE")
  45                 tw = CLAMP_TO_EDGE;
  46         else if(c.get()=="MIRRORED_REPEAT")
  47                 tw = MIRRORED_REPEAT;
  48         else
  49                 throw lexical_error(format("conversion of '%s' to TextureWrap", c.get()));
  50 }
  51
  52
  53 int Texture::swizzle_orders[] =
  54 {
  55         GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA,
  56         GL_RED, GL_RED, GL_RED, GL_ONE,
  57         GL_RED, GL_RED, GL_RED, GL_GREEN
  58 };
  59
  60 Texture::Texture(GLenum t, ResourceManager *m):
  61         id(0),
  62         target(t),
  63         ifmt(RGB),
  64         min_filter(NEAREST_MIPMAP_LINEAR),
  65         mag_filter(LINEAR),
  66         wrap_s(REPEAT),
  67         wrap_t(REPEAT),
  68         wrap_r(REPEAT),
  69         gen_mipmap(false),
  70         compare(false),
  71         cmp_func(LEQUAL),
  72         dirty_params(0)
  73 {
  74         if(m)
  75                 set_manager(m);
  76         else if(ARB_direct_state_access)
  77                 glCreateTextures(target, 1, &id);
  78         else
  79                 glGenTextures(1, &id);
  80 }
  81
  82 Texture::~Texture()
  83 {
  84         while(TexUnit *unit = TexUnit::find_unit(this))
  85                 unbind_from(unit->get_index());
  86
  87         if(id)
  88                 glDeleteTextures(1, &id);
  89 }
  90
  91 DataType Texture::get_alloc_type(PixelFormat fmt)
  92 {
  93         return (get_base_pixelformat(fmt)==DEPTH_COMPONENT ? UNSIGNED_SHORT : UNSIGNED_BYTE);
  94 }
  95
  96 void Texture::set_internal_format(PixelFormat fmt)
  97 {
  98         if(!get_component_size(fmt) && OES_required_internalformat)
  99                 fmt = get_default_sized_pixelformat(fmt);
 100
 101         FormatSwizzle swiz = NO_SWIZZLE;
 102         if(ARB_texture_rg && ARB_texture_swizzle)
 103         {
 104                 if(fmt==LUMINANCE8 || fmt==SLUMINANCE8)
 105                 {
 106                         fmt = R8;
 107                         swiz = R_TO_LUMINANCE;
 108                 }
 109                 else if(fmt==LUMINANCE8_ALPHA8 || fmt==SLUMINANCE8_ALPHA8)
 110                 {
 111                         fmt = RG8;
 112                         swiz = RG_TO_LUMINANCE_ALPHA;
 113                 }
 114         }
 115
 116         require_pixelformat(fmt);
 117         ifmt = fmt;
 118         swizzle = swiz;
 119         if(swizzle)
 120                 update_parameter(FORMAT_SWIZZLE);
 121 }
 122
 123 PixelFormat Texture::get_upload_format(PixelFormat fmt) const
 124 {
 125         if(fmt==LUMINANCE || fmt==LUMINANCE_ALPHA)
 126                 return get_base_pixelformat(ifmt);
 127         else
 128                 return fmt;
 129 }
 130
 131 void Texture::update_parameter(int mask) const
 132 {
 133         if(!ARB_direct_state_access && TexUnit::current().get_texture()!=this)
 134         {
 135                 TexUnit *unit = TexUnit::find_unit(this);
 136                 if(!unit)
 137                 {
 138                         dirty_params |= mask;
 139                         return;
 140                 }
 141
 142                 unit->bind();
 143         }
 144
 145         if(mask&MIN_FILTER)
 146                 set_parameter_i(GL_TEXTURE_MIN_FILTER, min_filter);
 147         if(mask&MAG_FILTER)
 148                 set_parameter_i(GL_TEXTURE_MAG_FILTER, mag_filter);
 149         if(mask&MAX_ANISOTROPY)
 150                 set_parameter_f(GL_TEXTURE_MAX_ANISOTROPY_EXT, max_anisotropy);
 151         if(mask&WRAP_S)
 152                 set_parameter_i(GL_TEXTURE_WRAP_S, wrap_s);
 153         if(mask&WRAP_T)
 154                 set_parameter_i(GL_TEXTURE_WRAP_T, wrap_t);
 155         if(mask&WRAP_R)
 156                 set_parameter_i(GL_TEXTURE_WRAP_R, wrap_r);
 157         if(mask&GENERATE_MIPMAP)
 158                 set_parameter_i(GL_GENERATE_MIPMAP, gen_mipmap);
 159         if(mask&COMPARE)
 160                 set_parameter_i(GL_TEXTURE_COMPARE_MODE, (compare ? GL_COMPARE_R_TO_TEXTURE : GL_NONE));
 161         if(mask&COMPARE_FUNC)
 162                 set_parameter_i(GL_TEXTURE_COMPARE_FUNC, cmp_func);
 163         if(mask&FORMAT_SWIZZLE)
 164         {
 165                 if(get_gl_api()==OPENGL_ES2)
 166                 {
 167                         set_parameter_i(GL_TEXTURE_SWIZZLE_R, swizzle_orders[swizzle*4]);
 168                         set_parameter_i(GL_TEXTURE_SWIZZLE_G, swizzle_orders[swizzle*4+1]);
 169                         set_parameter_i(GL_TEXTURE_SWIZZLE_B, swizzle_orders[swizzle*4+2]);
 170                         set_parameter_i(GL_TEXTURE_SWIZZLE_A, swizzle_orders[swizzle*4+3]);
 171                 }
 172                 else
 173                 {
 174                         if(ARB_direct_state_access)
 175                                 glTextureParameteriv(id, GL_TEXTURE_SWIZZLE_RGBA, swizzle_orders+swizzle*4);
 176                         else
 177                                 glTexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle_orders+swizzle*4);
 178                 }
 179         }
 180 }
 181
 182 void Texture::set_parameter_i(GLenum param, int value) const
 183 {
 184         if(ARB_direct_state_access)
 185                 glTextureParameteri(id, param, value);
 186         else
 187                 glTexParameteri(target, param, value);
 188 }
 189
 190 void Texture::set_parameter_f(GLenum param, float value) const
 191 {
 192         if(ARB_direct_state_access)
 193                 glTextureParameterf(id, param, value);
 194         else
 195                 glTexParameterf(target, param, value);
 196 }
 197
 198 void Texture::set_min_filter(TextureFilter f)
 199 {
 200         min_filter = f;
 201         update_parameter(MIN_FILTER);
 202 }
 203
 204 void Texture::set_mag_filter(TextureFilter f)
 205 {
 206         mag_filter = f;
 207         update_parameter(MAG_FILTER);
 208 }
 209
 210 void Texture::set_filter(TextureFilter f)
 211 {
 212         set_min_filter(f);
 213         set_mag_filter(f==NEAREST ? NEAREST : LINEAR);
 214 }
 215
 216 void Texture::set_max_anisotropy(float a)
 217 {
 218         if(a<1.0f)
 219                 throw invalid_argument("Texture::set_max_anisotropy");
 220         else if(a>1.0f)
 221                 static Require _req(EXT_texture_filter_anisotropic);
 222         max_anisotropy = a;
 223         update_parameter(MAX_ANISOTROPY);
 224 }
 225
 226 void Texture::set_wrap(TextureWrap w)
 227 {
 228         set_wrap_s(w);
 229         set_wrap_t(w);
 230         if(EXT_texture3D)
 231                 set_wrap_r(w);
 232 }
 233
 234 void Texture::set_wrap_s(TextureWrap w)
 235 {
 236         wrap_s = w;
 237         update_parameter(WRAP_S);
 238 }
 239
 240 void Texture::set_wrap_t(TextureWrap w)
 241 {
 242         wrap_t = w;
 243         update_parameter(WRAP_T);
 244 }
 245
 246 void Texture::set_wrap_r(TextureWrap w)
 247 {
 248         static Require _req(EXT_texture3D);
 249         wrap_r = w;
 250         update_parameter(WRAP_R);
 251 }
 252
 253 bool Texture::can_generate_mipmap()
 254 {
 255         return (EXT_framebuffer_object || SGIS_generate_mipmap);
 256 }
 257
 258 void Texture::set_generate_mipmap(bool gm)
 259 {
 260         if(gm && !EXT_framebuffer_object)
 261                 static Require _req(SGIS_generate_mipmap);
 262         gen_mipmap = gm;
 263         if(!EXT_framebuffer_object)
 264                 update_parameter(GENERATE_MIPMAP);
 265 }
 266
 267 void Texture::auto_generate_mipmap()
 268 {
 269         // glGenerateMipmap is defined here
 270         if(EXT_framebuffer_object)
 271         {
 272                 if(ARB_direct_state_access)
 273                         glGenerateTextureMipmap(id);
 274                 else
 275                         glGenerateMipmap(target);
 276         }
 277 }
 278
 279 void Texture::set_compare_enabled(bool c)
 280 {
 281         if(c)
 282                 static Require _req(ARB_shadow);
 283         compare = c;
 284         update_parameter(COMPARE);
 285 }
 286
 287 void Texture::set_compare_func(Predicate f)
 288 {
 289         static Require _req(ARB_shadow);
 290         cmp_func = f;
 291         update_parameter(COMPARE_FUNC);
 292 }
 293
 294 void Texture::load_image(const string &fn, bool srgb)
 295 {
 296         Graphics::Image img;
 297         img.load_file(fn);
 298
 299         image(img, srgb);
 300 }
 301
 302 void Texture::bind_to(unsigned i) const
 303 {
 304         if(!id)
 305         {
 306                 if(manager)
 307                         manager->resource_used(*this);
 308                 if(!id)
 309                 {
 310                         unbind_from(i);
 311                         return;
 312                 }
 313         }
 314
 315         TexUnit &unit = TexUnit::get_unit(i);
 316         const Texture *old = unit.get_texture();
 317         if(unit.set_texture(this))
 318         {
 319                 if(manager)
 320                         manager->resource_used(*this);
 321
 322                 unit.bind();
 323                 if(unit.supports_legacy())
 324                 {
 325                         if(old && old->target!=target)
 326                                 glDisable(old->target);
 327                         if(!old || old->target!=target)
 328                                 glEnable(target);
 329                 }
 330                 glBindTexture(target, id);
 331
 332                 if(dirty_params)
 333                 {
 334                         update_parameter(dirty_params);
 335                         dirty_params = 0;
 336                 }
 337         }
 338 }
 339
 340 const Texture *Texture::current(unsigned i)
 341 {
 342         return TexUnit::get_unit(i).get_texture();
 343 }
 344
 345 void Texture::unbind_from(unsigned i)
 346 {
 347         TexUnit &unit = TexUnit::get_unit(i);
 348         const Texture *cur = unit.get_texture();
 349         if(unit.set_texture(0))
 350         {
 351                 unit.bind();
 352                 glBindTexture(cur->target, 0);
 353                 if(unit.supports_legacy())
 354                         glDisable(cur->target);
 355         }
 356 }
 357
 358
 359 Texture::Loader::Loader(Texture &t):
 360         DataFile::CollectionObjectLoader<Texture>(t, 0)
 361 {
 362         init();
 363 }
 364
 365 Texture::Loader::Loader(Texture &t, Collection &c):
 366         DataFile::CollectionObjectLoader<Texture>(t, &c)
 367 {
 368         init();
 369 }
 370
 371 void Texture::Loader::init()
 372 {
 373         if(Resources *res = dynamic_cast<Resources *>(coll))
 374                 srgb = res->get_srgb_conversion();
 375         else
 376                 srgb = false;
 377
 378         add("external_image", &Loader::external_image);
 379         add("filter", &Loader::filter);
 380         add("generate_mipmap", &Loader::generate_mipmap);
 381         add("image_data", &Loader::image_data);
 382         add("mag_filter", &Loader::mag_filter);
 383         add("max_anisotropy", &Loader::max_anisotropy);
 384         add("min_filter", &Loader::min_filter);
 385         add("wrap",       &Loader::wrap);
 386         add("wrap_r",     &Loader::wrap_r);
 387         add("wrap_s",     &Loader::wrap_s);
 388         add("wrap_t",     &Loader::wrap_t);
 389 }
 390
 391 void Texture::Loader::external_image(const string &fn)
 392 {
 393         Graphics::Image img;
 394         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 395         img.load_io(*io);
 396
 397         obj.image(img, srgb);
 398 }
 399
 400 void Texture::Loader::filter(TextureFilter f)
 401 {
 402         obj.set_filter(f);
 403 }
 404
 405 void Texture::Loader::generate_mipmap(bool gm)
 406 {
 407         obj.set_generate_mipmap(gm);
 408 }
 409
 410 void Texture::Loader::image_data(const string &data)
 411 {
 412         Graphics::Image img;
 413         IO::Memory mem(data.data(), data.size());
 414         img.load_io(mem);
 415
 416         obj.image(img, srgb);
 417 }
 418
 419 void Texture::Loader::mag_filter(TextureFilter f)
 420 {
 421         obj.set_mag_filter(f);
 422 }
 423
 424 void Texture::Loader::max_anisotropy(float a)
 425 {
 426         obj.set_max_anisotropy(a);
 427 }
 428
 429 void Texture::Loader::min_filter(TextureFilter f)
 430 {
 431         obj.set_min_filter(f);
 432 }
 433
 434 void Texture::Loader::wrap(TextureWrap w)
 435 {
 436         obj.set_wrap(w);
 437 }
 438
 439 void Texture::Loader::wrap_r(TextureWrap w)
 440 {
 441         obj.set_wrap_r(w);
 442 }
 443
 444 void Texture::Loader::wrap_s(TextureWrap w)
 445 {
 446         obj.set_wrap_s(w);
 447 }
 448
 449 void Texture::Loader::wrap_t(TextureWrap w)
 450 {
 451         obj.set_wrap_t(w);
 452 }
 453
 454
 455 bool is_mipmapped(TextureFilter filter)
 456 {
 457         return (filter==NEAREST_MIPMAP_NEAREST || filter==NEAREST_MIPMAP_LINEAR ||
 458                 filter==LINEAR_MIPMAP_NEAREST || filter==LINEAR_MIPMAP_LINEAR);
 459 }
 460
 461 } // namespace GL
 462 } // namespace Msp