android : Error on Shading Language with opengl es2.0 on android 2.2

Question

I have a problem with application. is a simple application atm using opengl es2.0 which running on android 2.2 device HTC sense. I can running the application on my 4.0.3 emulator as well as my device which running android 4.0.

When running on android 2.2, i have this error:

> FATAL EXCEPTION: GLThread 9
java.lang.RuntimeException: Error compiling shader: 
SimpleShader.loadShader(SimpleShader.java:87)
SimpleShader.<init>(SimpleShader.java:54)
etc

I assumed that the device can run android 2.2 as the document told LINKS TO DOCUMENTATION, but not sure about the shader part though.

Here is my shader code:

String verticesShader =
        "uniform mat4 uScreen;\n" +    
        "attribute vec2 aPosition;\n" +
        "attribute vec3 aColor;\n" +
        "attribute vec2 aTexPos; \n" +
        "varying vec2 vTexPos; \n" + 
        "varying vec3 vColor;\n" +
        "void main() {\n" +
        " vTexPos = aTexPos; \n" +  
        " gl_Position = uScreen * vec4(aPosition.xy, 0.0, 1.0);\n" +
        "  vColor = aColor;\n" +
        "}";

      // Our fragment shader. Just return vColor.
      // If you look at this source and just said 'WTF?', remember
      // that all the attributes are defined in the VERTEX shader and
      // all the 'varying' vars are considered OUTPUT of vertex shader
      // and INPUT of the fragment shader. Here we just use the color
      // we received and add a alpha value of 1.
      String fragmentShader =
        "uniform float uUseTexture; \n" +
        "uniform float uAlpha; \n" +
        "uniform sampler2D uTexture;\n" +
        "precision mediump float;\n"+
        "varying vec2 vTexPos; \n" +
        "varying vec3 vColor;\n" + 
        "void main(void)\n" +
        "{\n" + 
        " if ( uUseTexture != 1.0 ) \n" +
        "  gl_FragColor = vec4(vColor.xyz, 1); \n" +
        " else \n" +
        "  gl_FragColor = texture2D(uTexture, vTexPos); \n" +
        " gl_FragColor.a *= uAlpha;" +
        //"  gl_FragColor = vec4(vColor.xyz, 1);\n" +
        "}";

private int loadShader(int shader, String shaderSrc) {
    // TODO Auto-generated method stub
    int handle = GLES20.glCreateShader(shader);

    if (handle == GLES20.GL_FALSE)
        throw new RuntimeException("Error creating shader!");

    GLES20.glShaderSource(handle, shaderSrc);
    GLES20.glCompileShader(handle);

    int[] compileStatus = new int[1];
    GLES20.glGetShaderiv(handle, GLES20.GL_COMPILE_STATUS, compileStatus, 0);

    if (compileStatus[0] ==0)
      {
        String error = GLES20.glGetShaderInfoLog(handle);
        GLES20.glDeleteShader(handle);
        throw new RuntimeException("Error compiling shader: " + error);
      }
      else
        return handle;

}

The application works fine on my latest device with android 4.0+

Answer 1

Have you considered checking your OpenGL ES GLSL version on both the android 2.2 device and the android 4.0+ device? You can print it with GLES20.glGetString(GLES20.GL_SHADING_LANGUAGE_VERSION).