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 const 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, unsigned lv)
 151 {
 152         Graphics::Image img;
 153         img.load_file(fn);
 154
 155         image(img, lv);
 156 }
 157
 158 void Texture::set_debug_name(const string &name)
 159 {
 160 #ifdef DEBUG
 161         debug_name = name;
 162         if(id && KHR_debug)
 163                 glObjectLabel(GL_TEXTURE, id, name.size(), name.c_str());
 164 #else
 165         (void)name;
 166 #endif
 167 }
 168
 169 void Texture::bind_scratch()
 170 {
 171         if(!scratch_binding)
 172                 glActiveTexture(GL_TEXTURE0);
 173         if(scratch_binding!=this)
 174         {
 175                 if(scratch_binding && scratch_binding->target!=target)
 176                         glBindTexture(scratch_binding->target, 0);
 177                 glBindTexture(target, id);
 178                 scratch_binding = this;
 179         }
 180 }
 181
 182 void Texture::unbind_scratch()
 183 {
 184         if(scratch_binding)
 185         {
 186                 glBindTexture(scratch_binding->target, 0);
 187                 scratch_binding = 0;
 188         }
 189 }
 190
 191
 192 Texture::Loader::Loader(Texture &t):
 193         DataFile::CollectionObjectLoader<Texture>(t, 0)
 194 {
 195         init();
 196 }
 197
 198 Texture::Loader::Loader(Texture &t, Collection &c):
 199         DataFile::CollectionObjectLoader<Texture>(t, &c)
 200 {
 201         init();
 202 }
 203
 204 void Texture::Loader::init()
 205 {
 206         levels = 0;
 207
 208         add("external_image", &Loader::external_image);
 209         add("external_image_srgb", &Loader::external_image_srgb);
 210         add("generate_mipmap", &Loader::generate_mipmap);
 211         add("image_data", &Loader::image_data);
 212         add("mipmap_levels", &Loader::mipmap_levels);
 213 }
 214
 215 void Texture::Loader::finish()
 216 {
 217         if(obj.auto_gen_mipmap)
 218                 obj.generate_mipmap();
 219 }
 220
 221 void Texture::Loader::load_external_image(Graphics::Image &img, const string &fn)
 222 {
 223         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 224         if(!io)
 225                 throw IO::file_not_found(fn);
 226         img.load_io(*io);
 227 }
 228
 229 void Texture::Loader::external_image(const string &fn)
 230 {
 231         obj.use_srgb_format = false;
 232         external_image_common(fn);
 233 }
 234
 235 void Texture::Loader::external_image_srgb(const string &fn)
 236 {
 237         obj.use_srgb_format = true;
 238         external_image_common(fn);
 239 }
 240
 241 void Texture::Loader::external_image_common(const string &fn)
 242 {
 243         if(obj.manager)
 244                 obj.manager->set_resource_location(obj, get_collection(), fn);
 245         else
 246         {
 247                 Graphics::Image img;
 248                 load_external_image(img, fn);
 249                 obj.image(img, levels);
 250         }
 251 }
 252
 253 void Texture::Loader::generate_mipmap(bool gm)
 254 {
 255         obj.auto_gen_mipmap = gm;
 256 }
 257
 258 void Texture::Loader::image_data(const string &data)
 259 {
 260         if(obj.manager)
 261         {
 262                 obj.set_manager(0);
 263                 if(!obj.id)
 264                         obj.generate_id();
 265         }
 266
 267         Graphics::Image img;
 268         IO::Memory mem(data.data(), data.size());
 269         img.load_io(mem);
 270
 271         obj.image(img, levels);
 272 }
 273
 274 void Texture::Loader::mipmap_levels(unsigned l)
 275 {
 276         levels = l;
 277 }
 278
 279 } // namespace GL
 280 } // namespace Msp