Blender Git Loki

Cleanup: shadowing (unwrap)

Fix T46841: Thick lines w/ graph visible

OpenSubdiv: support OpenGL 3.x

GLSL 130, 140, 150 with extensions as needed.

Similar logic to my recent gpu_extensions changes.

Partially fixes T46706. Matcaps now work with OpenSubdiv, as do basic
materials. Anything with UV coordinates is still broken.

OpenGL: Replace some more ARB suffix from glBindBufferARB.

CMake: use -Wshadow warning for C source

C source now builds without shadowing, enable with GCC by default.

Cleanup: shadowing (interface)

Cleanup: shadowing (editors)

Cleanup: shadowing (rna, modifiers, *misc*)

Cleanup: shadowing (bmesh)

Cleanup: shadowing (render)

Cleanup: shadowing (blenkernel)

Cleanup: shadowing (blenlib, gpu, imbuf)

Cleanup: use `rna_enum_` prefix for RNA enums

Definitions could shadow local vars.

Cleanup: use single struct for freestyle globals

Was shadowing local vars.

Cleanup: redundant string escape

Cleanup: warning

OpenGL: fix hq viewport dof on Mac / GL 2.1

My earlier fix for GL >= 3 on Windows broke it. Should work for both
platforms now.

OpenGL: codegen formatting

Formatting of generated GLSL code:
- attribute/varying for version 120
- in/out for version 130+
- minor cosmetic stuff

Tested working on Windows 10, GL 4.3.

OpenGL: update geometry shaders, fixes T46838

OpenGL: choose compatible GLSL version

Fix GLSL version & geometry shader support query to consider core vs
compatibility.

All shaders need to be compatible with each other, and for now that
means GLSL 120. For drivers that support compatibility profiles, choose
the highest available (up to 150). If only core profile is supported,
max out at GLSL 130.