Whether it works at run-time is another question;)
Use the same source files as for X11, with relevant conditional
coding.
The Windows OpenGL import library corresponds to OpenGL 1.2, so we
can't directly use APIs from OpenGL 1.3 or newer. (Even if they as
such are present in the "Mesa" headers we use.) So look up also
glActivetexture() dynamically.
Change-Id: I2280e2ad7e190356e9409cc28142fa9fc33e078b
The slideshow engine emits viewChanged() immediately after the
transition has been initialized. Because the ShaderTransition data were
not fully reset in finishTransition_, no transition texture would be
generated on the re-initialization in viewChanged(), thus there would be
no transition on the first slide.
Change-Id: I04fef9a6c09537995d83889be2fe15569a1ddc2c
