Fixes rendering issues with R300 and similar GPUs. If the texture
uses GL_TEXTURE_RECTANGLE_ARB as target the tex coordinates need
to be adjusted. This at least fixes missing text on EffectFrames
with graphicssystem native on R300. Hopefully more issues are
resolved by the change.
BUG: 269576
CCBUG: 282882
FIXED-IN: 4.7.3
Additionally:
- hide the GLTexture implementation using dpointers
- drop the unused function SceneOpenGL::Texture::optimizeBindDamage()
- Texture::load now loads a new texture and does not update the existing one
REVIEW: 101999
Now convertToGLFormat does no longer mirror the texture, so that we can
avoid a deep copy in case we render a GL_BGRA texture on a little endian system.
REVIEW: 101739
