* format: add internal formats for drm formats
cross referenced with weston and added internal formats and types for a
lot of missing ones. also added a isFormatYUV helper.
* framebuffer: ensure we use right internalformat
ensure we use the right internal format to avoid internal driver
blitting, also since we only attach the GL_STENCIL_ATTACHMENT we might
just aswell only use the GL_STENCIL_INDEX8 to not confuse drivers that
we want a depth aswell.
* texture: use external on yuv or non linear mods
using external makes us use the gpu's internal detiler.
and this is makes intel a lot happier then having to format convert it
to a linear format internally.
* shaders: add external support to CM frag
add external support to CM frag, and correct ext.frag typo.
* formats: remove duplicates and fix a typo in cm.frag
remove duplicate formats and a typo in cm.frag
* formats: add swizzle logic to all formats
add swizzle logic from weston for all formats and use it in shm texture
paths.
* format: more format changes
use monitor drm format instead of forcing something different.
* shader: remove external from cm.frag
drivers want this resolved at compiletime cant use both
samplerExternalOES and sampler2d and then runtime branch it.
* screencopy: swizzle textures in screencopy
swizzle textures in screencopy, to get the right colors when copying.
* screencopy: restore old behaviour
try restore old behaviour before the gles3 format changes.
glReadPixels had the wrong format, so i went to far trying to mitigate
it. should be like before now.
