Fixed bug 1748 - Patch for errors and mistakes in SDL 2 README files.

Philipp Wiesemann

SDL's README files seem to contain multiple errors and mistakes. I attached a patch with changes and updates.

README:
 * removed Windows CE because no more supported

README-SDL.txt:
 * corrected spelling mistake

README.DirectFB:
 * corrected spelling mistakes

README.MacOSX:
 * corrected spelling mistakes

README.Platforms:
 * changed Android version to match AndroidManifest.xml

README.Porting:
 * added missing directories from list
 * removed cdrom directories from list

README.android:
 * updated required NDK revision
 * add project.properties to list
 * changed lower limit for to android-10 and removed upper
 * added a statement why older devices not supported
 * added correct dates to statements about OpenGL ES
 * added info about Google's device numbers and date
 * corrected spelling mistakes

README.gesture:
 * corrected spelling mistakes

README.pandora:
 * corrected spelling mistake

README.touch:
 * changed that values are no in range 0..1
 * updated the names of some functions
 * updated the notes about usage
 * corrected spelling mistakes
 * added info that API changed near original author contact
Fixed bug 1749 - SDL_GL_CreateContext() causes fatal X11 protocol errors that should just be caught instead

Lee Salzman

When using SDL_GL_CreateContext() to create a >= 3.0 version or core/forward-compatible context, internally glXCreateContextAttribsARB is used. Mesa in particular seems to be having trouble with this call and returning all sorts of errors, so it is dangerous to poll for the highest GL version by using calls to SDL_GL_CreateContext unless you are sure, a priori, that the call will suceed, defeating the point of its use.

X11 protocol errors are of the following form, with varying details depending on user, but the cause is always SDL_GL_CreateContext as above...

X Error of failed request:  GLXBadFBConfig
  Major opcode of failed request:  153 (GLX)
  Minor opcode of failed request:  34 ()
  Serial number of failed request:  215
  Current serial number in output stream:  221

These sorts of errors can be temporarily filtered out by setting an X11 error handler to catch and ignore them, which is safe with respect to SDL_GL_CreateContext behavior because this function is allowed to return NULL to indicate failure.

A patch is attached to do this temporary filtering/catching of errors generated by trying to use glXCreateContextAttribs and friends...
Fixed bug 1750 - Directfb renderer does not support SDL_RENDERER_TARGETTEXTURE

tomaszewski.p

DirectFB renderer does not support SDL_RENDERER_TARGETTEXTURE what makes it incompatible with GL or GLES(2) renderers.

Attached patched:
- adds support for SDL_RENDERER_TARGETTEXTURE,
- DirectFB RenderCopy converts destination rectangle from floats to ints,
- fixes whitespaces to be the same in whole file.