intel drivers don;'t like it for some odd reason - i'm trying to track
it down but i can't sanely try middlegrounds right now (eg dont
dlopen/dlsym but actually directly assign symbols etc.), so back out
and let's figure this out before it goes back in :(
SVN revision: 66308
addition to evas gl backend.
Working on different mobile devices, we've noticed that the cost of context
switch (MakeCurrent) in GL can be very expensive depending on the driver
implementation. To minimize the poorly written driver's context switch
overhead, I've implemented a state tracking layer on top of the driver
implemented GL.
Essentially, this layer wraps all the GL/Glue(GLX/EGL) APIs and manages its own
state changes. Internally, only one real GL context is created and logical
contexts are created every time a user requests context creation. The logical
contexts keep track of its states and sets only the necessary states
(the ones that are different than the current ones)
when there is a MakeCurrent request. The real MakeCurrent gets called when
there is a Surface/Window change request.
The GL library is dlopened and all the APIs are dlsym'ed and wrapped
accordingly. All the GL functions are in evas_gl_core.{h,c}.
Here's a very simply flow of the code.
- all the APIs are exported as function pointers (*glsym_glBegin),
(*glsm_eglCreatContext), and etc.
- all the native GL/Glue(GLX/EGL) APIs are dlsym'ed as _sym_glBegin,
_sym_eglCreateContext, and etc.
- all the fastpath APIs are implmemnted as fpgl_glBegin,
fpgl_eglCreateContext, and etc.
- if faspath is seletected, the exported APIs are set accordingly
ie. glsym_glBegin = fpgl_glBegin;
- default mode is the regular gl symbols are directly set.
ie. glsym_glBegin = _sym_glBegin;
I have an Environment variable where you can set it to three different Modes
EVAS_GL_FASTPATH = 0 // Default mode. Regular GL symbols are directly loaded
EVAS_GL_FASTPATH = 1 // Fastpath mode. Takes the path described above.
EVAS_GL_FASTPATH = 2 // Wrapped mode. All the regular GL functions are
wrapped once. This can be used for various
purposes
Since all the GL symbols are now loaded in this library, I took out all
the gl symbol loading parts in the evas gl backend as you'll see in the patch.
The changes to the engine and the backend itself is pretty minor.
There are still some known issues to hammer out but I thought we're at a good
place for an initial version so that my source doesn't diverge too much.
Known Issues and To Do's
* Current GL Fastpath version doesn't support multiple threads. Instead of
having one global real context, I would need to do it for each thread. I'll
get on this soon.
* Issues running Evas GL on certain conditions. When running the elementary
test (with gl engine), if you run ELMGLview test that runs in ON_DEMAND mode,
everything works fine. BUT, when you run the ELMGLView test in ALWAYS
mode, the subsequent elm tests shows blank screen. When you destroy the
GLView window, everything else comes on fine.
* Resource protection code. This actually applies to Evas GL code in general
as well. Since all the resources are shared among all the contexts that get
created, I would like to eventually have a resource protecting mechanism that
prevents access to resources outside of its context unless specifically
specified.
I'm attaching three files
- evas_gl_core.h, evas_gl_core.c, fastpath.patch
To get the code running...
- copy evas_gl_core.{c,h} to src/modules/engine/gl_common/
- apply the fastpath.patch
- compile/install evas
- to run with fastpath GL (ie. % EVAS_GL_FASTPATH=1 ./evasgl_sample1)
SVN revision: 65891
Subject: evas_gl_api_get patch.
Here's a patch that simply overrides the GL functions for Evas_GL
except for two functions that I provide on my own. It may have some symbol
resolving warnings but that'll all go away eventually when we do everything
via dlsym or getProcAddress.
You can apply the patch to the latest revision of evas. (I've just
updated them) I'm also attaching a sample GLES program that uses
evas_gl_api_get. You don't need to link it to -lGL.
SVN revision: 59092
screens with the same gl context is more pain than imagined. revert
attempt to handle it. just use xinerama/twinview if u want the
compositor to not suck.
SVN revision: 58050
* log domains in lower-case only please. let's make it a standard so
we don't have to look at the code everytime to figure out the name...
* logs do NOT require trailing newline (\n), it's automatic!
* do NOT add newline inside log messages!
* add gl_common logging.
NOTE: I tried to compile all modules, but there are clear broken
modules such as cairo and qtopia. Other modules like gl_sdl are
broken as they were not updated to new gl_common api (resize
method AFAIR).
SVN revision: 53174
Christopher Michael
Carsten Haitzler
Vincent Torri
Tom Hacohen
Sung W. Park
Mike Blumenkrantz
Gustavo Sverzut Barbieri