Function GetNumMips

renderdoc/driver/gl/gl_resources.cpp:777–817

}

int GetNumMips(GLenum target, GLuint tex, GLuint w, GLuint h, GLuint d)
{
  int mips = 1;

  // renderbuffers don't have mips
  if(target == eGL_RENDERBUFFER)
    return 1;

  GLint immut = 0;
  GL.glGetTextureParameterivEXT(tex, target, eGL_TEXTURE_IMMUTABLE_FORMAT, &immut);

  if(immut)
    GL.glGetTextureParameterivEXT(tex, target, eGL_TEXTURE_IMMUTABLE_LEVELS, (GLint *)&mips);
  else
    mips = CalcNumMips(w, h, d);

  GLint maxLevel = 1000;
  GL.glGetTextureParameterivEXT(tex, target, eGL_TEXTURE_MAX_LEVEL, &maxLevel);
  mips = RDCMIN(mips, maxLevel + 1);

  if(immut == 0)
  {
    // check to see if all mips are set, or clip the number of mips to those that are
    // set.
    if(target == eGL_TEXTURE_CUBE_MAP)
      target = eGL_TEXTURE_CUBE_MAP_POSITIVE_X;

    for(int i = 0; i < mips; i++)
    {
      GLint width = 0;
      GL.glGetTextureLevelParameterivEXT(tex, target, i, eGL_TEXTURE_WIDTH, &width);
      if(width == 0)
      {
        mips = i;
        break;
      }
    }
  }

  return RDCMAX(1, mips);
}

void GetFramebufferMipAndLayer(GLuint framebuffer, GLenum attachment, GLint *mip, GLint *layer)
{