message: Add defines for potentially missing GL_* values (as in ospExamples)
diff: @@ -29,6 +29,21 @@ using namespace rkcommon::math;
  using namespace ospray;
  using rkcommon::make_unique;
  +// on Windows often only GL 1.1 headers are present
  +// and Mac may be missing the float defines
  +#ifndef GL_CLAMP_TO_BORDER
  +#define GL_CLAMP_TO_BORDER 0x812D
  +#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
  +
  enum class OSPRayRendererType
  {
  SCIVIS,
  