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         const Texture3D &self = *static_cast<const Texture3D *>(this);
  25
  26         if(!id)
  27                 create();
  28
  29         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  30         if(ARB_texture_storage)
  31         {
  32                 if(ARB_direct_state_access)
  33                         glTextureStorage3D(id, n_levels, gl_fmt, self.width, self.height, self.depth);
  34                 else
  35                 {
  36                         bind_scratch();
  37                         glTexStorage3D(target, n_levels, gl_fmt, self.width, self.height, self.depth);
  38                 }
  39         }
  40         else
  41         {
  42                 bind_scratch();
  43                 GLenum comp = get_gl_components(get_components(storage_fmt));
  44                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  45                 for(unsigned i=0; i<n_levels; ++i)
  46                 {
  47                         auto lv_size = self.get_level_size(i);
  48                         glTexImage3D(target, i, gl_fmt, lv_size.x, lv_size.y, lv_size.z, 0, comp, type, 0);
  49                 }
  50                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, n_levels-1);
  51         }
  52
  53         apply_swizzle();
  54 }
  55
  56 void OpenGLTexture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsigned ht, unsigned dp, const void *data)
  57 {
  58         GLenum comp = get_gl_components(get_components(storage_fmt));
  59         GLenum type = get_gl_type(get_component_type(storage_fmt));
  60         if(ARB_direct_state_access)
  61                 glTextureSubImage3D(id, level, x, y, z, wd, ht, dp, comp, type, data);
  62         else
  63         {
  64                 bind_scratch();
  65                 glTexSubImage3D(target, level, x, y, z, wd, ht, dp, comp, type, data);
  66         }
  67 }
  68
  69 bool OpenGLTexture3D::is_array() const
  70 {
  71         return target==GL_TEXTURE_2D_ARRAY;
  72 }
  73
  74 size_t OpenGLTexture3D::get_data_size() const
  75 {
  76         if(!id)
  77                 return 0;
  78
  79         const Texture3D &self = *static_cast<const Texture3D *>(this);
  80
  81         size_t level_size = self.width*self.height*self.depth*get_pixel_size(format);
  82         size_t total_size = level_size;
  83         for(unsigned i=0; i<n_levels; ++i, level_size>>=2)
  84                 total_size += level_size;
  85         return total_size;
  86 }
  87
  88 } // namespace GL
  89 } // namespace Msp