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         const Texture2DMultisample &self = *static_cast<const Texture2DMultisample *>(this);
  19
  20         if(!id)
  21                 create();
  22
  23         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  24         if(ARB_texture_storage_multisample)
  25         {
  26                 if(ARB_direct_state_access)
  27                         glTextureStorage2DMultisample(id, self.samples, gl_fmt, self.width, self.height, false);
  28                 else
  29                 {
  30                         bind_scratch();
  31                         glTexStorage2DMultisample(target, self.samples, gl_fmt, self.width, self.height, false);
  32                 }
  33         }
  34         else
  35         {
  36                 bind_scratch();
  37                 glTexImage2DMultisample(target, self.samples, gl_fmt, self.width, self.height, false);
  38         }
  39         apply_swizzle();
  40 }
  41
  42 size_t OpenGLTexture2DMultisample::get_data_size() const
  43 {
  44         const Texture2DMultisample &self = *static_cast<const Texture2DMultisample *>(this);
  45         return self.width*self.height*get_pixel_size(format)*self.samples;
  46 }
  47
  48 } // namespace GL
  49 } // namespace Msp