Create internal format as GL_RG8 for LUMINANCE_ALPHA. Closes #1599
Create internal format as GL_RG8 for LUMINANCE_ALPHA. Closes #1599

Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc