source/backends/opengl/texturecube_backend.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_seamless_cube_map.h>
   3 #include <msp/gl/extensions/arb_texture_cube_map.h>
   4 #include <msp/gl/extensions/arb_texture_storage.h>
   5 #include "gl.h"
   6 #include "texturecube.h"
   7 #include "texturecube_backend.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 OpenGLTextureCube::OpenGLTextureCube():
  15         Texture(GL_TEXTURE_CUBE_MAP)
  16 {
  17         static Require _req(ARB_texture_cube_map);
  18         if(ARB_seamless_cube_map)
  19         {
  20                 static bool seamless_init = false;
  21                 if(!seamless_init)
  22                 {
  23                         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
  24                         seamless_init = true;
  25                 }
  26         }
  27 }
  28
  29 void OpenGLTextureCube::allocate()
  30 {
  31         unsigned size = static_cast<const TextureCube *>(this)->size;
  32         unsigned levels = static_cast<const TextureCube *>(this)->levels;
  33
  34         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  35         if(ARB_texture_storage)
  36         {
  37                 if(ARB_direct_state_access)
  38                         glTextureStorage2D(id, levels, gl_fmt, size, size);
  39                 else
  40                 {
  41                         bind_scratch();
  42                         glTexStorage2D(target, levels, gl_fmt, size, size);
  43                 }
  44         }
  45         else
  46         {
  47                 bind_scratch();
  48                 GLenum comp = get_gl_components(get_components(storage_fmt));
  49                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  50                 for(unsigned i=0; i<levels; ++i)
  51                 {
  52                         unsigned lv_size = static_cast<const TextureCube *>(this)->get_level_size(i);
  53                         for(unsigned j=0; j<6; ++j)
  54                                 glTexImage2D(get_gl_cube_face(j), i, gl_fmt, lv_size, lv_size, 0, comp, type, 0);
  55                 }
  56                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  57         }
  58
  59         apply_swizzle();
  60 }
  61
  62 void OpenGLTextureCube::sub_image(unsigned face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
  63 {
  64         GLenum comp = get_gl_components(get_components(storage_fmt));
  65         GLenum type = get_gl_type(get_component_type(storage_fmt));
  66         if(ARB_direct_state_access)
  67                 glTextureSubImage3D(id, level, x, y, face, wd, ht, 1, comp, type, data);
  68         else
  69         {
  70                 bind_scratch();
  71                 glTexSubImage2D(get_gl_cube_face(face), level, x, y, wd, ht, comp, type, data);
  72         }
  73 }
  74
  75 unsigned get_gl_cube_face(unsigned face)
  76 {
  77         switch(static_cast<TextureCubeFace>(face))
  78         {
  79         case POSITIVE_X: return GL_TEXTURE_CUBE_MAP_POSITIVE_X;
  80         case NEGATIVE_X: return GL_TEXTURE_CUBE_MAP_NEGATIVE_X;
  81         case POSITIVE_Y: return GL_TEXTURE_CUBE_MAP_POSITIVE_Y;
  82         case NEGATIVE_Y: return GL_TEXTURE_CUBE_MAP_NEGATIVE_Y;
  83         case POSITIVE_Z: return GL_TEXTURE_CUBE_MAP_POSITIVE_Z;
  84         case NEGATIVE_Z: return GL_TEXTURE_CUBE_MAP_NEGATIVE_Z;
  85         default: throw invalid_argument("get_gl_cube_face");
  86         }
  87 }
  88
  89 } // namespace GL
  90 } // namespace Msp