Blender Git Loki

cleanup: redundant include & defines

GLEW takes care of this.

VAOs are not part of OpenGL 2.1 but are very widely supported. Even so
we should check before using. Current code does not check.

Also minor style things I missed in the previous commit.

cleanup: code style

C-style comments, braces & pointer placement.

compile fixes for MSVC

draw grid floor & objects in new viewport

Yanked verbatim from view3d_draw_objects, so there�??s nothing �??new�?
about drawing method. But it does let us see objects positioned in
space which shows us transforms are working properly.

OpenGL batched geometry API (experimental)

Clean slate design, with some overlap with existing Blender APIs. Using
GPUx_ prefix to avoid confusion with current GPU_ files.

- specify vertex attribs
- buffer in main memory & VRAM
- build element lists of points, lines, triangles
- draw these --^
- state tracking (fairly basic)
- lots of error & bounds checking!!! can turn this off

The idea is to handle things like VBOs, VAOs, other useful extensions
automatically so users of this API don't have to work hard to get it
right every time. This also lets us turn things on/off in one place for
debugging & perf measurements.

- - - -
Checking this code in now to give it a home & test on multiple systems.
It�??s not being used yet and will probably evolve quite a bit as our
needs become clearer.

Just clear the buffers in new viewport

Flag for new viewport

Also move new gpu object to derived mesh - we can probably do a few
abstractions here, but gpuObject creation is a bit derivedmesh type
specific (each DM has its own way to calculate vertices needed etc).

Move data copying function from gpu_buffers.c to cdderivedmesh.c (as it
should be, since it's specialized to this derivedmesh type)

Merge branch 'master' into GPU_data_request

Fix some ordering issues, remove leftover glBegin/glEnd

Initial VBO code for GPU subsurf.

This commit adds a few generalizations to the VBO
code so that modifiers can create and populate their own GPU objects.

The VBO code originally supported CDDerivedMesh only. The design moves slightly
towards the viewport refactor where the rendering system requests data from the
modifiers.

In this commit only basic support for vertices and normals is provided and
some features from blender's VBO system, suchs as mapping to original faces,
unique element indices for vertices and loose vertex/edge support are missing.
Also, the quick navigation feature of the subsurf modifier won't be supported
for now.

What we do have is full support for solid shading with multiple materials,
flat/smooth shading and a big performance boost.