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Messed up texture coordinates on Mali-T628 (not using mediump...)

O.Hedman

We recently released our game on Google Play, and it is going great.

Though on devices with Mali T628 (Galaxy Tab S, Galaxy Note 3) there is an issue with texture coordinates..

Works fine on all other platforms.

I found a post here about there being an issue with mediump, but we are using highp in our shader.

I'm attaching a screen shot here, and the relevant shaders.

Any ideas what could go wrong?

This shader is for the environment (not working):

+++

Loaded vertex shader: bmxshaders/MultiTextureT0T2.vsh - ID: 4

precision highp float;

attribute vec4 a_position;

attribute vec2 a_texCoord0;

attribute vec2 a_texCoord2;

varying vec2 v_texCoord0;

varying vec2 v_texCoord2;

uniform mat4 u_matWVP;

void main()

{

     gl_Position = u_matWVP * a_position;

     v_texCoord0 = a_texCoord0;

     v_texCoord2 = a_texCoord2;

}

---

Loaded pixel shader bmxshaders/MultiTextureT0s1d0T2s2d0.fsh - ID: 5

precision highp float;

varying vec2 v_texCoord0;

varying vec2 v_texCoord2;

uniform sampler2D s_texture0;

uniform sampler2D s_texture2;

void main()

{

     vec4 color0;

     vec4 color1;

     color0 = texture2D(s_texture0, v_texCoord0);

     color1 = texture2D(s_texture2, v_texCoord2);

     gl_FragColor = color0 * color1;

}

+++

This shader is for the bike (seems to work fine):

+++

Loaded vertex shader: bmxshaders/LightingSimpleDirNoScaleNormals.vsh - ID: 16

precision highp float;

struct light

{

  vec3 position;

  vec4 ambient;

  vec4 diffuse;

  vec4 specular;

  // only directional light is supported

};

const float c_zero = 0.0;

const float c_one = 1.0;

uniform light u_light0;

attribute vec4 a_position;

attribute vec3 a_normal;

attribute vec2 a_texCoord;

varying vec2 v_texCoord;

varying vec4 v_color;

uniform mat4 u_matWVP;

uniform mat3 u_matWVNormals;

void main()

{

  float ndotl;

  vec3 n;

  n = u_matWVNormals * a_normal;

  v_color = vec4(0,0,0,1);

  v_color += u_light0.ambient;

  ndotl = max(dot(u_light0.position.xyz,n), c_zero);

  v_color += (ndotl * u_light0.diffuse);

  gl_Position = u_matWVP * a_position;

  v_texCoord = a_texCoord;

}

---

Loaded pixel shader bmxshaders/Lighting.fsh - ID: 17

precision highp float;

varying vec2 v_texCoord;

varying vec4 v_color;

uniform sampler2D s_texture0;

void main()

{

    gl_FragColor = texture2D(s_texture0, v_texCoord) * v_color;

}

+++

Parents
  • 0

    Hi olof,

    I've taken a quick look at what's going on when running the game on a T628 device and can reproduce the issue.  I think it could well be caused by the precision of your samplers in Shader 7, attached to Program 4.

    Could you try declaring the uniform samplers as highp and see if it helps?

    precision highp float;

    varying vec2 v_texCoord0;

    varying vec2 v_texCoord2;

    + uniform highp sampler2D s_texture0;

    + uniform highp sampler2D s_texture2;

    void main()

    {

        vec4 color0;

        vec4 color1;

        color0 = texture2D(s_texture0, v_texCoord0);

        color1 = texture2D(s_texture2, v_texCoord2);

        gl_FragColor = color0 * color1;

    }

    Cheers,

    Rich

Reply
  • 0

    Hi olof,

    I've taken a quick look at what's going on when running the game on a T628 device and can reproduce the issue.  I think it could well be caused by the precision of your samplers in Shader 7, attached to Program 4.

    Could you try declaring the uniform samplers as highp and see if it helps?

    precision highp float;

    varying vec2 v_texCoord0;

    varying vec2 v_texCoord2;

    + uniform highp sampler2D s_texture0;

    + uniform highp sampler2D s_texture2;

    void main()

    {

        vec4 color0;

        vec4 color1;

        color0 = texture2D(s_texture0, v_texCoord0);

        color1 = texture2D(s_texture2, v_texCoord2);

        gl_FragColor = color0 * color1;

    }

    Cheers,

    Rich

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