[cairo] Run Cairo with OpenGL ES 2 backend on Android
Ngoc Dao
ngocdaothanh at gmail.com
Thu Jul 4 00:16:46 PDT 2013
Henry,
Thanks for your instruction but result is the same:
* The Android app crashes on some devices
* On some other devices, it does not crash but the screen is blank, nothing
is displayed
I've created this Android project:
https://github.com/ngocdaothanh/android-cairogles
You can build and run it to investigate on your machine.
Thanks.
On Thu, Jul 4, 2013 at 2:56 AM, Henry (Yu) Song - SISA <
henry.song at samsung.com> wrote:
> Hi, Ngoc
>
> I could not extract much from your log. It seems somewhere in
> cairo_device_create_for_egl has error. Did you compile cairo with debug.
>
> EGL_SAMPLES and EGL_SAMPLE_BUFFERS are attributes setting when you
> eglChooseConfig, like following snippet
>
> EGLint attr[] = {
> EGL_SURFACE_TYPE, EGL_WINDOW_BIT, // window surface instead of
> pixmap or pbuffer surface
> EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, // configure for
> opengl es 2
> EGL_STENCIL_SIZE, 1, // minimal stencil size
> EGL_RED_SIZE, 1,
> EGL_GREEN_SIZE, 1,
> EGL_BLUE_SIZE, 1,
> EGL_ALPHA_SIZE, 1,
> EGL_SAMPLES, 4, // 4x msaa
> EGL_SAMPLE_BUFFERS, 1, // must be 1
> EGL_NONE
> };
>
> if(!eglChooseConfig (egl_display, attr, &egl_config, 1, &num)) {
> printf("cannot choose config\n");
> exit(-1);
> }
>
> if (num != 1) {
> printf("did not get exactly one config = %d\n", num);
> exit(-1);
> }
>
> // create an egl window surface from existing native window (in x
> case, win = XCreateWindow()/XCreateSimpleWindow() )
> EGLSurface egl_surface = eglCreateWindowSurface (egl_display,
> egl_config, (NativeWindowType) window, NULL);
>
>
> Hope this helps
>
> Henry
> ________________________________________
> From: Ngoc Dao [ngocdaothanh at gmail.com]
> Sent: Wednesday, July 03, 2013 4:43 AM
> To: Henry (Yu) Song - SISA
> Cc: cairo at cairographics.org
> Subject: Re: [cairo] Run Cairo with OpenGL ES 2 backend on Android
>
> Hi Henry,
>
> How to set EGL_SAMPLES and EGL_SAMPLE_BUFFERS?
> Is it OK to set CAIRO_GL_COMPOSITOR like this?
> putenv("CAIRO_GL_COMPOSITOR=msaa");
>
> Attached is the error log.
>
>
> On Tue, Jun 25, 2013 at 11:22 PM, Henry (Yu) Song - SISA <
> henry.song at samsung.com<mailto:henry.song at samsung.com>> wrote:
> Hi, Ngoc
>
> CAIRO_GL_COMPOSITOR=msaa is not a compile time setting. At runtime, cairo
> checks this setting.
>
> Regarding to crash, can you send log?
>
> Henry
>
> From: Ngoc Dao [mailto:ngocdaothanh at gmail.com<mailto:
> ngocdaothanh at gmail.com>]
> Sent: Tuesday, June 25, 2013 2:18 AM
> To: Henry (Yu) Song - SISA
> Cc: cairo at cairographics.org<mailto:cairo at cairographics.org>
> Subject: Re: [cairo] Run Cairo with OpenGL ES 2 backend on Android
>
> Hi Henry,
> Thanks for the info.
>
> I use Samsung Galaxy S3 (Android 4.0.2) and S3 alpha (Android 4.1.1).
>
> I updated my code as you instructed:
>
> CAIRO_GL_COMPOSITOR=msaa:
>
> https://github.com/ngocdaothanh/jsg/blob/cairogles/android/jni/cairo.mk#L149
>
> EGL init:
>
> https://github.com/ngocdaothanh/jsg/blob/cairogles/android/jni/jsg/jsg.cpp#L373
> Could you please check the code above to see if there's anything wrong?
> It still crashes on S3 and slow (and nothing is shown on the screen) on S3
> alpha.
>
> Regards,
> Ngoc
>
> On Tue, Jun 25, 2013 at 1:29 AM, Henry (Yu) Song - SISA <
> henry.song at samsung.com<mailto:henry.song at samsung.com>> wrote:
> Hi, Ngoc
>
> Which cairo git did you get cairogles from? At this moment, there are
> three gl compositors in cairo.
>
> I don’t have android to test. If you give me some more info, I might be
> able to help you.
>
>
> 1. What is the GL driver on your android phone?
>
> 2. Does it support GL_IMG_multisampled_render_to_texture or
> GL_EXT_multisampled_render_to_texture extensions?
>
> 3. When you initialize EGL, do you use EGL_SAMPLES and
> EGL_SAMPLE_BUFFERS in configuration?
>
> The reason I ask is that if you enable/or your driver supports MSAA, there
> is a faster GL compositor in cairo, called msaa compositor. The msaa
> compositor is being upstreamed at this moment, but not all of it has been
> upstreamed, about 20 patches left.
>
> If you want to test with msaa compositor, please visit our branch in
> github - https://github.com/SRA-SiliconValley/cairogles, please pull
> release branch, it is synced with cairo-1.12.14.
>
> When you run cairo, set env CAIRO_GL_COMPOSITOR=msaa, in addition, if your
> app is single-threaded or you have dedicated thread for GL rendering,
> please use cairo_gl_device_set_thread_aware (device, FALSE) to avoid
> unnecessary context switch.
>
> If you want to try shadow/blur in cairo, please pull filters-wip branch.
> We have implemented Gaussian filter and drop shadow in that branch for
> both image and gl backends as well. Tests show our GL backend blur/shadow
> performance is very good, beat skia’s drawBlurLooper hands-down.
> Image-backend performance is not near as good as skia, due to slow
> performance on pixman bilinear sampling, at least on PC. If you have idea
> to improve, please feel free comment or send patches.
>
> Henry
>
> From: cairo-bounces+hsong=sisa.samsung.com at cairographics.org<mailto:
> sisa.samsung.com at cairographics.org> [mailto:cairo-bounces+hsong<mailto:
> cairo-bounces%2Bhsong>=sisa.samsung.com at cairographics.org<mailto:
> sisa.samsung.com at cairographics.org>] On Behalf Of Ngoc Dao
> Sent: Wednesday, June 19, 2013 11:23 PM
> To: cairo at cairographics.org<mailto:cairo at cairographics.org>
> Subject: [cairo] Run Cairo with OpenGL ES 2 backend on Android
>
> Hi.
>
> Have anyone tried to run Cairo with OpenGL ES 2 backend on Android? Is
> there any crash? How's the speed?
>
> I've created a project here (branch master: image backend, cairogles
> branch: OpenGL ES 2 backend):
> https://github.com/ngocdaothanh/jsg
> Some basic results from the project above:
>
> OpenGL ES 2 backend:
> * Crashes on Android 2.3, 4.0.2 etc. with shader compilation problem
> * Doesn't crash on Android 4.1.1, but very very slow, 0.5 FPS/s
> Image backend is stable but slow, 12 FPS/s.
> Ngoc
>
>
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