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OpenGL ES 2.0 problems

Kwan Chi Lee
  • Arm Employee Badge
    Note: This was originally posted on 2nd November 2012 at http://forums.arm.com

    Hi Chi,

    thanks for the report.

    I must say, my first thought seeing the screenshots was perhaps some issue with the texture coordinates and/or clamping mode (as though GL_TEXTURE_WRAP_S and GL_TEXTURE_WRAP_T had been set to GL_CLAMP_TO_EDGE). It would also be interesting to see the fragment shader code to see if any arithmetic is being done on the texture coords.

    Does the problem show up with the version of the PicArts app on Google Play? Are there any particular steps required to reproduce the issue?

    Cheers, Pete
  • Note: This was originally posted on 17th November 2012 at http://forums.arm.com

    Hi Pete,

    Sorry for the late reply, and thank you for your quick respond.
    Here are the information that may help, please look at it.
    There is no special procedure to produce this problem,
    I just open it up. It seems that all Mali-400MP device have this problem.
    And another user using Galaxy S2 has the same problem too,
    hope we can fix it together asap. Great thanks.

    Texture Wrapping Function
    All texture are set by this helper function.
    setWraps(GLES20.GL_CLAMP_TO_EDGE, GLES20.GL_CLAMP_TO_EDGE);
    public void setWraps(int wrapS, int wrapT) {

         this.wrapS = wrapS;

         this.wrapT = wrapT;

         GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, wrapS);

        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, wrapT);

    }




    Fragment Shader

    #version 100

    precision highp float;

    uniform sampler2D s_texture;

    varying vec2 vTexCoord;

    void main(){

    gl_FragColor = texture2D(s_texture, vTexCoord);

    }

    Vertex Shader

    #version 100

    attribute vec4 aPosition;

    attribute vec2 aTexCoord;

    varying vec2 vTexCoord;




    void main(){

    gl_Position = aPosition;

    vTexCoord = aTexCoord;

    }

    Photo Mesh

    normal = new float[]{

    -1.0f, -1.0f, 0.0f, 1.0f,

           1.0f, -1.0f, 1.0f, 1.0f,

           1.0f, 1.0f, 1.0f, 0.0f,

           -1.0f, 1.0f, 0.0f, 0.0f};



    4 vertices (x, y, s, t).

    Cheers,

    Chi











  • Arm Employee Badge
    Note: This was originally posted on 4th December 2012 at http://forums.arm.com

    Hi Chi,

    I'm struggling to reproduce the issue here. I have a Samsung Galaxy S2 running Android 4.0.4.

    I have installed PicArts 3.1.2. I start it, and select "From Gallery" and choose a photo:



    I am able to pick several filters, e.g. Hue/Saturation:



    Blur:



    Sketch:



    They all seem to look OK?

    Can you perhaps explain the steps necessary to reproduce the problem, or tell us more specifics about the device and versions involved?

    I have looked at the application and shader code, and none of that looks like it would cause a problem.

    Thanks, Pete
  • Note: This was originally posted on 11th December 2012 at http://forums.arm.com

    Hello Pete,

    Because of this issue, we updated the app on the store immediately to the older version.
    That's why the problem didn't arise when you try the 3.1.2 out.
    However, I cannot give you all the source code. I am trying to write a little app to show you what is wrong.

    Thanks,
    Chi
  • Arm Employee Badge
    Note: This was originally posted on 12th December 2012 at http://forums.arm.com

    Hi Chi,

    of course, I understand you cannot give out the source. Would it be possible to host a binary APK somewhere of the later version that does show the problem? That may be quicker than you writing a test case, and should be enough to debug the problem.

    Thanks, Pete