message: used OGL 32-bit float texture for OSPRay framebuffer
diff: #ifndef GL_CLAMP_TO_BORDER
  #define GL_CLAMP_TO_BORDER 0x812D
  #endif
  -#ifndef GL_SRGB_ALPHA
  -#define GL_SRGB_ALPHA 0x8C42
  -#endif
  #ifndef GL_FRAMEBUFFER_SRGB
  #define GL_FRAMEBUFFER_SRGB 0x8DB9
  #endif
  +#ifndef GL_RGBA32F
  +#define GL_RGBA32F 0x8814
  +#endif
  +#ifndef GL_RGB32F
  +#define GL_RGB32F 0x8815
  +#endif
  static bool g_quitNextFrame = false;
  @@ -311,15 +314,14 @@ void GLFWOSPRayWindow::display()
  auto *fb = framebuffer.map(showAlbedo ? OSP_FB_ALBEDO : OSP_FB_COLOR);
  - const GLint glFormat = showAlbedo ? GL_RGB : GL_RGBA;
  glBindTexture(GL_TEXTURE_2D, framebufferTexture);
  glTexImage2D(GL_TEXTURE_2D,
  0,
  - glFormat,
  + showAlbedo ? GL_RGB32F : GL_RGBA32F,
  windowSize.x,
  windowSize.y,
  0,
  - glFormat,
  + showAlbedo ? GL_RGB : GL_RGBA,
  GL_FLOAT,
  fb);
  