source/sampler.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_sampler_objects.h>
   3 #include <msp/gl/extensions/arb_shadow.h>
   4 #include <msp/gl/extensions/ext_texture_filter_anisotropic.h>
   5 #include <msp/gl/extensions/ext_texture3d.h>
   6 #include <msp/strings/format.h>
   7 #include "error.h"
   8 #include "sampler.h"
   9 #include "texture.h"
  10 #include "texunit.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 Sampler::Sampler():
  18         owner(0)
  19 {
  20         init();
  21
  22         Require _req(ARB_sampler_objects);
  23         if(ARB_direct_state_access)
  24                 glCreateSamplers(1, &id);
  25         else
  26                 glGenSamplers(1, &id);
  27 }
  28
  29 Sampler::Sampler(const Texture &tex):
  30         id(0),
  31         owner(&tex)
  32 {
  33         if(this!=&tex.get_default_sampler())
  34                 throw invalid_argument("Sampler::Sampler");
  35
  36         init();
  37 }
  38
  39 void Sampler::init()
  40 {
  41         min_filter = NEAREST_MIPMAP_LINEAR;
  42         mag_filter = LINEAR;
  43         max_anisotropy = 1.0f;
  44         wrap_s = REPEAT;
  45         wrap_t = REPEAT;
  46         wrap_r = REPEAT;
  47         compare = false;
  48         cmp_func = LEQUAL;
  49         dirty_params = 0;
  50 }
  51
  52 void Sampler::update_parameter(int mask) const
  53 {
  54         if(owner)
  55         {
  56                 if(!owner->get_id())
  57                 {
  58                         dirty_params |= mask;
  59                         return;
  60                 }
  61
  62                 if(!ARB_direct_state_access && TexUnit::current().get_texture()!=owner)
  63                 {
  64                         TexUnit *unit = TexUnit::find_unit(owner);
  65                         if(!unit)
  66                         {
  67                                 dirty_params |= mask;
  68                                 return;
  69                         }
  70
  71                         unit->bind();
  72                 }
  73         }
  74
  75         if(mask&MIN_FILTER)
  76                 set_parameter_i(GL_TEXTURE_MIN_FILTER, min_filter);
  77         if(mask&MAG_FILTER)
  78                 set_parameter_i(GL_TEXTURE_MAG_FILTER, mag_filter);
  79         if(mask&MAX_ANISOTROPY)
  80                 set_parameter_f(GL_TEXTURE_MAX_ANISOTROPY_EXT, max_anisotropy);
  81         if(mask&WRAP_S)
  82                 set_parameter_i(GL_TEXTURE_WRAP_S, wrap_s);
  83         if(mask&WRAP_T)
  84                 set_parameter_i(GL_TEXTURE_WRAP_T, wrap_t);
  85         if(mask&WRAP_R)
  86                 set_parameter_i(GL_TEXTURE_WRAP_R, wrap_r);
  87         if(mask&COMPARE)
  88         {
  89                 set_parameter_i(GL_TEXTURE_COMPARE_MODE, (compare ? GL_COMPARE_R_TO_TEXTURE : GL_NONE));
  90                 if(compare)
  91                         set_parameter_i(GL_TEXTURE_COMPARE_FUNC, cmp_func);
  92         }
  93 }
  94
  95 void Sampler::set_parameter_i(unsigned param, int value) const
  96 {
  97         if(id)
  98                 glSamplerParameteri(id, param, value);
  99         else if(ARB_direct_state_access)
 100                 glTextureParameteri(owner->get_id(), param, value);
 101         else
 102                 glTexParameteri(owner->get_target(), param, value);
 103 }
 104
 105 void Sampler::set_parameter_f(unsigned param, float value) const
 106 {
 107         if(id)
 108                 glSamplerParameterf(id, param, value);
 109         else if(ARB_direct_state_access)
 110                 glTextureParameterf(owner->get_id(), param, value);
 111         else
 112                 glTexParameterf(owner->get_target(), param, value);
 113 }
 114
 115 void Sampler::set_min_filter(TextureFilter f)
 116 {
 117         min_filter = f;
 118         update_parameter(MIN_FILTER);
 119 }
 120
 121 void Sampler::set_mag_filter(TextureFilter f)
 122 {
 123         mag_filter = f;
 124         update_parameter(MAG_FILTER);
 125 }
 126
 127 void Sampler::set_filter(TextureFilter f)
 128 {
 129         set_min_filter(f);
 130         set_mag_filter(f==NEAREST ? NEAREST : LINEAR);
 131 }
 132
 133 void Sampler::set_max_anisotropy(float a)
 134 {
 135         if(a<1.0f)
 136                 throw invalid_argument("Sampler::set_max_anisotropy");
 137         else if(a>1.0f)
 138                 static Require _req(EXT_texture_filter_anisotropic);
 139         max_anisotropy = a;
 140         if(EXT_texture_filter_anisotropic)
 141                 update_parameter(MAX_ANISOTROPY);
 142 }
 143
 144 void Sampler::set_wrap(TextureWrap w)
 145 {
 146         set_wrap_s(w);
 147         set_wrap_t(w);
 148         if(EXT_texture3D)
 149                 set_wrap_r(w);
 150 }
 151
 152 void Sampler::set_wrap_s(TextureWrap w)
 153 {
 154         wrap_s = w;
 155         update_parameter(WRAP_S);
 156 }
 157
 158 void Sampler::set_wrap_t(TextureWrap w)
 159 {
 160         wrap_t = w;
 161         update_parameter(WRAP_T);
 162 }
 163
 164 void Sampler::set_wrap_r(TextureWrap w)
 165 {
 166         static Require _req(EXT_texture3D);
 167         wrap_r = w;
 168         update_parameter(WRAP_R);
 169 }
 170
 171 void Sampler::disable_compare()
 172 {
 173         compare = false;
 174         update_parameter(COMPARE);
 175 }
 176
 177 void Sampler::set_compare(Predicate f)
 178 {
 179         static Require _req(ARB_shadow);
 180         compare = true;
 181         cmp_func = f;
 182         update_parameter(COMPARE);
 183 }
 184
 185 void Sampler::bind_to(unsigned i) const
 186 {
 187         TexUnit &unit = TexUnit::get_unit(i);
 188         if(owner && owner!=unit.get_texture())
 189                 throw invalid_operation("Sampler::bind_to");
 190
 191         const Sampler *cur = unit.get_sampler();
 192         if(unit.set_sampler(this))
 193         {
 194                 if(!owner || (cur && cur->id))
 195                         glBindSampler(i, id);
 196
 197                 if(dirty_params)
 198                 {
 199                         update_parameter(dirty_params);
 200                         dirty_params = 0;
 201                 }
 202         }
 203 }
 204
 205 const Sampler *Sampler::current(unsigned i)
 206 {
 207         return TexUnit::get_unit(i).get_sampler();
 208 }
 209
 210 void Sampler::unbind_from(unsigned i)
 211 {
 212         TexUnit &unit = TexUnit::get_unit(i);
 213         const Sampler *cur = unit.get_sampler();
 214         if(unit.set_sampler(0) && cur->id)
 215                 glBindSampler(i, 0);
 216 }
 217
 218 void Sampler::unload()
 219 {
 220         // TODO check which params actually need refreshing
 221         if(!owner->get_id())
 222                 dirty_params = -1;
 223 }
 224
 225
 226 Sampler::Loader::Loader(Sampler &s):
 227         DataFile::ObjectLoader<Sampler>(s)
 228 {
 229         add("filter", &Loader::filter);
 230         add("mag_filter", &Loader::mag_filter);
 231         add("max_anisotropy", &Loader::max_anisotropy);
 232         add("min_filter", &Loader::min_filter);
 233         add("wrap", &Loader::wrap);
 234         add("wrap_r", &Loader::wrap_r);
 235         add("wrap_s", &Loader::wrap_s);
 236         add("wrap_t", &Loader::wrap_t);
 237 }
 238
 239 void Sampler::Loader::filter(TextureFilter f)
 240 {
 241         obj.set_filter(f);
 242 }
 243
 244 void Sampler::Loader::mag_filter(TextureFilter f)
 245 {
 246         obj.set_mag_filter(f);
 247 }
 248
 249 void Sampler::Loader::max_anisotropy(float a)
 250 {
 251         obj.set_max_anisotropy(a);
 252 }
 253
 254 void Sampler::Loader::min_filter(TextureFilter f)
 255 {
 256         obj.set_min_filter(f);
 257 }
 258
 259 void Sampler::Loader::wrap(TextureWrap w)
 260 {
 261         obj.set_wrap(w);
 262 }
 263
 264 void Sampler::Loader::wrap_r(TextureWrap w)
 265 {
 266         obj.set_wrap_r(w);
 267 }
 268
 269 void Sampler::Loader::wrap_s(TextureWrap w)
 270 {
 271         obj.set_wrap_s(w);
 272 }
 273
 274 void Sampler::Loader::wrap_t(TextureWrap w)
 275 {
 276         obj.set_wrap_t(w);
 277 }
 278
 279
 280 bool is_mipmapped(TextureFilter filter)
 281 {
 282         return (filter==NEAREST_MIPMAP_NEAREST || filter==NEAREST_MIPMAP_LINEAR ||
 283                 filter==LINEAR_MIPMAP_NEAREST || filter==LINEAR_MIPMAP_LINEAR);
 284 }
 285
 286 void operator>>(const LexicalConverter &c, TextureFilter &tf)
 287 {
 288         if(c.get()=="NEAREST")
 289                 tf = NEAREST;
 290         else if(c.get()=="LINEAR")
 291                 tf = LINEAR;
 292         else if(c.get()=="NEAREST_MIPMAP_NEAREST")
 293                 tf = NEAREST_MIPMAP_NEAREST;
 294         else if(c.get()=="NEAREST_MIPMAP_LINEAR")
 295                 tf = NEAREST_MIPMAP_LINEAR;
 296         else if(c.get()=="LINEAR_MIPMAP_NEAREST")
 297                 tf = LINEAR_MIPMAP_NEAREST;
 298         else if(c.get()=="LINEAR_MIPMAP_LINEAR")
 299                 tf = LINEAR_MIPMAP_LINEAR;
 300         else
 301                 throw lexical_error(format("conversion of '%s' to TextureFilter", c.get()));
 302 }
 303
 304 void operator>>(const LexicalConverter &c, TextureWrap &tw)
 305 {
 306         if(c.get()=="REPEAT")
 307                 tw = REPEAT;
 308         else if(c.get()=="CLAMP_TO_EDGE")
 309                 tw = CLAMP_TO_EDGE;
 310         else if(c.get()=="MIRRORED_REPEAT")
 311                 tw = MIRRORED_REPEAT;
 312         else
 313                 throw lexical_error(format("conversion of '%s' to TextureWrap", c.get()));
 314 }
 315
 316
 317 } // namespace GL
 318 } // namespace Msp