source/core/texture.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_texture_swizzle.h>
   3 #include <msp/gl/extensions/ext_framebuffer_object.h>
   4 #include <msp/gl/extensions/khr_debug.h>
   5 #include <msp/io/memory.h>
   6 #include "error.h"
   7 #include "resourcemanager.h"
   8 #include "resources.h"
   9 #include "texture.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 int Texture::swizzle_orders[] =
  17 {
  18         GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA,
  19         GL_RED, GL_RED, GL_RED, GL_ONE,
  20         GL_RED, GL_RED, GL_RED, GL_GREEN,
  21         GL_BLUE, GL_GREEN, GL_RED, GL_ALPHA
  22 };
  23
  24 Texture *Texture::scratch_binding = 0;
  25
  26 Texture::Texture(GLenum t, ResourceManager *m):
  27         id(0),
  28         target(t),
  29         format(RGB8),
  30         storage_fmt(RGB8),
  31         swizzle(NO_SWIZZLE),
  32         use_srgb_format(false),
  33         auto_gen_mipmap(false)
  34 {
  35         if(m)
  36                 set_manager(m);
  37         else
  38                 generate_id();
  39
  40         static bool alignment_init = false;
  41         if(!alignment_init)
  42         {
  43                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  44                 alignment_init = true;
  45         }
  46 }
  47
  48 Texture::~Texture()
  49 {
  50         if(this==scratch_binding)
  51                 unbind_scratch();
  52         if(id)
  53                 glDeleteTextures(1, &id);
  54 }
  55
  56 void Texture::generate_id()
  57 {
  58         if(id)
  59                 throw invalid_operation("Texture::generate_id");
  60         if(ARB_direct_state_access)
  61                 glCreateTextures(target, 1, &id);
  62         else
  63                 glGenTextures(1, &id);
  64
  65 #ifdef DEBUG
  66         if(!debug_name.empty() && KHR_debug)
  67                 glObjectLabel(GL_TEXTURE, id, debug_name.size(), debug_name.c_str());
  68 #endif
  69 }
  70
  71 void Texture::set_format(PixelFormat fmt)
  72 {
  73         PixelComponents comp = get_components(fmt);
  74         PixelComponents st_comp = comp;
  75         FormatSwizzle swiz = NO_SWIZZLE;
  76         switch(comp)
  77         {
  78         case LUMINANCE:
  79                 st_comp = RED;
  80                 swiz = R_TO_LUMINANCE;
  81                 break;
  82         case LUMINANCE_ALPHA:
  83                 st_comp = RG;
  84                 swiz = RG_TO_LUMINANCE_ALPHA;
  85                 break;
  86         case BGR:
  87                 st_comp = RGB;
  88                 swiz = RGB_TO_BGR;
  89                 break;
  90         case BGRA:
  91                 st_comp = RGBA;
  92                 swiz = RGB_TO_BGR;
  93                 break;
  94         default:;
  95         }
  96
  97         PixelFormat st_fmt = make_pixelformat(st_comp, get_component_type(fmt), is_srgb(fmt));
  98         require_pixelformat(st_fmt);
  99         if(swiz!=NO_SWIZZLE)
 100                 static Require _req(ARB_texture_swizzle);
 101
 102         format = fmt;
 103         storage_fmt = st_fmt;
 104         swizzle = swiz;
 105 }
 106
 107 void Texture::apply_swizzle()
 108 {
 109         if(swizzle==NO_SWIZZLE)
 110                 return;
 111
 112         if(get_gl_api()==OPENGL_ES2)
 113         {
 114                 set_parameter_i(GL_TEXTURE_SWIZZLE_R, swizzle_orders[swizzle*4]);
 115                 set_parameter_i(GL_TEXTURE_SWIZZLE_G, swizzle_orders[swizzle*4+1]);
 116                 set_parameter_i(GL_TEXTURE_SWIZZLE_B, swizzle_orders[swizzle*4+2]);
 117                 set_parameter_i(GL_TEXTURE_SWIZZLE_A, swizzle_orders[swizzle*4+3]);
 118         }
 119         else
 120         {
 121                 if(ARB_direct_state_access)
 122                         glTextureParameteriv(id, GL_TEXTURE_SWIZZLE_RGBA, swizzle_orders+swizzle*4);
 123                 else
 124                         glTexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle_orders+swizzle*4);
 125         }
 126 }
 127
 128 void Texture::set_parameter_i(GLenum param, int value) const
 129 {
 130         if(ARB_direct_state_access)
 131                 glTextureParameteri(id, param, value);
 132         else
 133                 glTexParameteri(target, param, value);
 134 }
 135
 136 void Texture::generate_mipmap()
 137 {
 138         // glGenerateMipmap is defined here
 139         static Require _req(EXT_framebuffer_object);
 140
 141         if(ARB_direct_state_access)
 142                 glGenerateTextureMipmap(id);
 143         else
 144         {
 145                 bind_scratch();
 146                 glGenerateMipmap(target);
 147         }
 148 }
 149
 150 void Texture::load_image(const string &fn, bool)
 151 {
 152         load_image(fn, 0U);
 153 }
 154
 155 void Texture::load_image(const string &fn, unsigned lv)
 156 {
 157         Graphics::Image img;
 158         img.load_file(fn);
 159
 160         image(img, lv);
 161 }
 162
 163 void Texture::image(const Graphics::Image &img, bool)
 164 {
 165         image(img, 0U);
 166 }
 167
 168 void Texture::set_debug_name(const string &name)
 169 {
 170 #ifdef DEBUG
 171         debug_name = name;
 172         if(id && KHR_debug)
 173                 glObjectLabel(GL_TEXTURE, id, name.size(), name.c_str());
 174 #else
 175         (void)name;
 176 #endif
 177 }
 178
 179 void Texture::bind_scratch()
 180 {
 181         if(!scratch_binding)
 182                 glActiveTexture(GL_TEXTURE0);
 183         if(scratch_binding!=this)
 184         {
 185                 if(scratch_binding && scratch_binding->target!=target)
 186                         glBindTexture(scratch_binding->target, 0);
 187                 glBindTexture(target, id);
 188                 scratch_binding = this;
 189         }
 190 }
 191
 192 void Texture::unbind_scratch()
 193 {
 194         if(scratch_binding)
 195         {
 196                 glBindTexture(scratch_binding->target, 0);
 197                 scratch_binding = 0;
 198         }
 199 }
 200
 201
 202 Texture::Loader::Loader(Texture &t):
 203         DataFile::CollectionObjectLoader<Texture>(t, 0)
 204 {
 205         init();
 206 }
 207
 208 Texture::Loader::Loader(Texture &t, Collection &c):
 209         DataFile::CollectionObjectLoader<Texture>(t, &c)
 210 {
 211         init();
 212 }
 213
 214 void Texture::Loader::init()
 215 {
 216         levels = 0;
 217
 218         add("external_image", &Loader::external_image);
 219         add("external_image_srgb", &Loader::external_image_srgb);
 220         add("generate_mipmap", &Loader::generate_mipmap);
 221         add("image_data", &Loader::image_data);
 222         add("mipmap_levels", &Loader::mipmap_levels);
 223 }
 224
 225 void Texture::Loader::finish()
 226 {
 227         if(obj.auto_gen_mipmap)
 228                 obj.generate_mipmap();
 229 }
 230
 231 void Texture::Loader::load_external_image(Graphics::Image &img, const string &fn)
 232 {
 233         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 234         if(!io)
 235                 throw IO::file_not_found(fn);
 236         img.load_io(*io);
 237 }
 238
 239 void Texture::Loader::external_image(const string &fn)
 240 {
 241         obj.use_srgb_format = false;
 242         external_image_common(fn);
 243 }
 244
 245 void Texture::Loader::external_image_srgb(const string &fn)
 246 {
 247         obj.use_srgb_format = true;
 248         external_image_common(fn);
 249 }
 250
 251 void Texture::Loader::external_image_common(const string &fn)
 252 {
 253         if(obj.manager)
 254                 obj.manager->set_resource_location(obj, get_collection(), fn);
 255         else
 256         {
 257                 Graphics::Image img;
 258                 load_external_image(img, fn);
 259                 obj.image(img, levels);
 260         }
 261 }
 262
 263 void Texture::Loader::generate_mipmap(bool gm)
 264 {
 265         obj.auto_gen_mipmap = gm;
 266 }
 267
 268 void Texture::Loader::image_data(const string &data)
 269 {
 270         if(obj.manager)
 271         {
 272                 obj.set_manager(0);
 273                 if(!obj.id)
 274                         obj.generate_id();
 275         }
 276
 277         Graphics::Image img;
 278         IO::Memory mem(data.data(), data.size());
 279         img.load_io(mem);
 280
 281         obj.image(img, levels);
 282 }
 283
 284 void Texture::Loader::mipmap_levels(unsigned l)
 285 {
 286         levels = l;
 287 }
 288
 289 } // namespace GL
 290 } // namespace Msp