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Mali T604 and eglImageKHR and FBO

Sebastien Baudouin
Note: This was originally posted on 12th June 2013 at http://forums.arm.com

Hi,

i'm implementing an Android application using the GPU and especially ImageKHR and FrameBuffer Objects.
In a thread and its GLES context i'm creating a texture and its eglImageKHR then i share the eglImageKHR handle with another thread. In this second thread i'm creating a FrameBuffer Object with the given eglImageKHR as color buffer and a renderbuffer (for the depth) . Then from this second thread i'm drawing using openGLES 1.x commands into the just created FBO. The result is displayed on screen by the First thread.

All that is working well with a MALI-400 but running that application on a nexus 10 which use MALI-T604 i have some issue.
1- NO GL ERROR appear.
2- the FBO status is OK

but the screen is sometime OK sometime completely black.

I try to replace the drawing operation by a simple clear color where the color is changing at each call and sometime i can see part of the screen with a color and part that is black.

Is someone aware of differences between MALI-400 and MALI-T604 that could cause such kind of issue. unfortunately i do not have any documentation on T604 to really understand what is happening. I tried to enable auto MIMAP generation in case of T604 as for (NVidia GPU it was a mandatory condition the make the texture "complete") but nothing has changed.

I suspect that it is coming from ImageKHR because i have a JAVA application where i'm uising FBO without ImageKHR and it seems to work fine.

Here is the sequence to create the FBO with EGLImageKHR:
glGenFramebuffersOES(1, (GLuint*) 0x777ada1c);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, 1);

glGenRenderbuffersOES(1, (GLuint*) 0x777ada1c);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, 1);

glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, 1184, 694);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, 1);

glGenTextures(1, (GLuint *) 0x777ada0c);
glBindTexture(GL_TEXTURE_2D, 3);
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES) 0x752d700c);

glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, 3, 0);

glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);



I hope someone will be able to help me to understand what i'm missing .

Br

Seb
Parents
  • Note: This was originally posted on 24th June 2013 at http://forums.arm.com

    Hi McGeagh,

    unfortunately it is very difficult for me to share my app. This app is split into three parts:
    - one part of OEM mobile phone images
    - one part downloaded from the market
    - one part downloaded from a server.

    Even if the graphic are a is not split over the three parts we need all of them to make the application working.


    As i tried to explain what i observed is that the same app was working fine on MALI 400 and the same app is working strangely having some time the screen black and sometime the right screen. My app is heavily using FBO (for off screen rendering) and EglImageKHR for exchanging textures between GLES contexts.

    EglImage seems important to me even if the app is muti-threaded and not multi-processes as i can share texture between context of different types (GLES 1.0 or GLES 2.0) and also as shared context seems badly supported by GPU on the market (not mali).


    I will try to bluid a new app using FBO and ImageKHR to see if i can duplicate the problem with that App.


    If you have any idea on possible mistake on my side let me know i will try.

    Br

    Seb
Reply
  • Note: This was originally posted on 24th June 2013 at http://forums.arm.com

    Hi McGeagh,

    unfortunately it is very difficult for me to share my app. This app is split into three parts:
    - one part of OEM mobile phone images
    - one part downloaded from the market
    - one part downloaded from a server.

    Even if the graphic are a is not split over the three parts we need all of them to make the application working.


    As i tried to explain what i observed is that the same app was working fine on MALI 400 and the same app is working strangely having some time the screen black and sometime the right screen. My app is heavily using FBO (for off screen rendering) and EglImageKHR for exchanging textures between GLES contexts.

    EglImage seems important to me even if the app is muti-threaded and not multi-processes as i can share texture between context of different types (GLES 1.0 or GLES 2.0) and also as shared context seems badly supported by GPU on the market (not mali).


    I will try to bluid a new app using FBO and ImageKHR to see if i can duplicate the problem with that App.


    If you have any idea on possible mistake on my side let me know i will try.

    Br

    Seb
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