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