Two issues in texture_changed:
- Missing NULL check for material (slot could be empty)
- Materials could be linked to object, added special check for this
was changed to an invalid one. Also fixed Object Color not being displayed correctly
with VBO's.
The way it has to clear the VBO buffers here is quite poor though and slow, we
really need textures and materials in the depsgraph to do this quicker.
When FBO failed in a particular way it could cause the opengl draw buffer to be
set wrong, effectively disabling all opengl drawing. The FBO error was caused
by cycles GLSL materials with no nodes that would still use blender internal
materials, which caused issues with lamp shadow buffers FBO.
This also fixes a GLSL refresh issue when switching render engines.
was added for cycles.
This fixes the case where the option is disabled. I moved the option now to
Blender itself and made it keep the engine around only when it's enabled. Also
fixes case where there could be issues when switching to another renderer.
http://wiki.blender.org/index.php/Dev:2.6/Source/Render/RenderEngineAPI
* This adds a Rendered draw type in the 3D view, only available when
the render engine implements the view_draw callback.
* 3D view now stores a pointer to a RenderEngine.
* view_draw() callback will do OpenGL drawing instead of the viewport.
* view_update() callback is called after depsgraph updates.
