source/backends/opengl/texture2dmultisample_backend.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_texture_multisample.h>
   3 #include <msp/gl/extensions/arb_texture_storage_multisample.h>
   4 #include "texture2dmultisample.h"
   5 #include "texture2dmultisample_backend.h"
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 OpenGLTexture2DMultisample::OpenGLTexture2DMultisample():
  11         Texture(GL_TEXTURE_2D_MULTISAMPLE)
  12 {
  13         static Require _req(ARB_texture_multisample);
  14 }
  15
  16 void OpenGLTexture2DMultisample::allocate()
  17 {
  18         unsigned width = static_cast<const Texture2DMultisample *>(this)->width;
  19         unsigned height = static_cast<const Texture2DMultisample *>(this)->height;
  20         unsigned samples = static_cast<const Texture2DMultisample *>(this)->samples;
  21
  22         if(!id)
  23                 create();
  24
  25         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  26         if(ARB_texture_storage_multisample)
  27         {
  28                 if(ARB_direct_state_access)
  29                         glTextureStorage2DMultisample(id, samples, gl_fmt, width, height, false);
  30                 else
  31                 {
  32                         bind_scratch();
  33                         glTexStorage2DMultisample(target, samples, gl_fmt, width, height, false);
  34                 }
  35         }
  36         else
  37         {
  38                 bind_scratch();
  39                 glTexImage2DMultisample(target, samples, gl_fmt, width, height, false);
  40         }
  41         apply_swizzle();
  42 }
  43
  44 size_t OpenGLTexture2DMultisample::get_data_size() const
  45 {
  46         unsigned width = static_cast<const Texture2DMultisample *>(this)->width;
  47         unsigned height = static_cast<const Texture2DMultisample *>(this)->height;
  48         unsigned samples = static_cast<const Texture2DMultisample *>(this)->samples;
  49         return width*height*get_pixel_size(format)*samples;
  50 }
  51
  52 } // namespace GL
  53 } // namespace Msp