Summary of Functionality differences from version 1.3
Minor wording changes, clarifications, and examples added or changed to keep in sync with the OpenGL
The following features are added or changed:
• Add uniform blocks and layouts to be backed by the application through buffer bindings.
• Rectangular textures, including the closure of t he functionality indicated by the original
texture_rectangle extension, the gpu_shader4 extension and the 1.3 version of GLSL.
• Texture buffers .
• Add gl_InstanceID for instance drawing.
• Don't require writing to gl_Position.