source/backends/opengl/texture3d_backend.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_texture_storage.h>
   3 #include <msp/gl/extensions/ext_texture3d.h>
   4 #include <msp/gl/extensions/ext_texture_array.h>
   5 #include "gl.h"
   6 #include "texture3d.h"
   7 #include "texture3d_backend.h"
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 OpenGLTexture3D::OpenGLTexture3D():
  13         Texture(GL_TEXTURE_3D)
  14 {
  15         static Require _req(EXT_texture3D);
  16 }
  17
  18 OpenGLTexture3D::OpenGLTexture3D(unsigned t):
  19         Texture(t)
  20 { }
  21
  22 void OpenGLTexture3D::allocate()
  23 {
  24         unsigned width = static_cast<const Texture3D *>(this)->width;
  25         unsigned height = static_cast<const Texture3D *>(this)->height;
  26         unsigned depth = static_cast<const Texture3D *>(this)->depth;
  27         unsigned levels = static_cast<const Texture3D *>(this)->levels;
  28
  29         if(!id)
  30                 create();
  31
  32         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  33         if(ARB_texture_storage)
  34         {
  35                 if(ARB_direct_state_access)
  36                         glTextureStorage3D(id, levels, gl_fmt, width, height, depth);
  37                 else
  38                 {
  39                         bind_scratch();
  40                         glTexStorage3D(target, levels, gl_fmt, width, height, depth);
  41                 }
  42         }
  43         else
  44         {
  45                 bind_scratch();
  46                 GLenum comp = get_gl_components(get_components(storage_fmt));
  47                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  48                 for(unsigned i=0; i<levels; ++i)
  49                 {
  50                         auto lv_size = static_cast<const Texture3D *>(this)->get_level_size(i);
  51                         glTexImage3D(target, i, gl_fmt, lv_size.x, lv_size.y, lv_size.z, 0, comp, type, 0);
  52                 }
  53                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  54         }
  55
  56         apply_swizzle();
  57 }
  58
  59 void OpenGLTexture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, const void *data)
  60 {
  61         GLenum comp = get_gl_components(get_components(storage_fmt));
  62         GLenum type = get_gl_type(get_component_type(storage_fmt));
  63         if(ARB_direct_state_access)
  64                 glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, comp, type, data);
  65         else
  66         {
  67                 bind_scratch();
  68                 glTexSubImage3D(target, level, x, y, z, wd, ht, dp, comp, type, data);
  69         }
  70 }
  71
  72 bool OpenGLTexture3D::is_array() const
  73 {
  74         return target==GL_TEXTURE_2D_ARRAY;
  75 }
  76
  77 size_t OpenGLTexture3D::get_data_size() const
  78 {
  79         if(!id)
  80                 return 0;
  81
  82         unsigned width = static_cast<const Texture3D *>(this)->width;
  83         unsigned height = static_cast<const Texture3D *>(this)->height;
  84         unsigned depth = static_cast<const Texture3D *>(this)->depth;
  85         unsigned levels = static_cast<const Texture3D *>(this)->levels;
  86
  87         size_t level_size = width*height*depth*get_pixel_size(format);
  88         size_t total_size = level_size;
  89         for(unsigned i=0; i<levels; ++i, level_size>>=2)
  90                 total_size += level_size;
  91         return total_size;
  92 }
  93
  94 } // namespace GL
  95 } // namespace Msp