Posted by piotrekk on Jun 10, 2015; 4:28pm
URL: https://forum.jogamp.org/JOGL-2-0-OpenGL-OpenGL-ES-backend-for-LibGDX-tp4027689p4034652.html

ok, so after corrections my shaders looks like:

vertex:

#version 120
in vec4 a_color;
in vec3 a_position;
in vec2 a_texCoord0;

uniform mat4 u_projTrans;

out vec4 v_color;
out vec2 v_texCoord0;

void main() {
        v_color = a_color;
        v_texCoord0 = a_texCoord0;
        gl_Position = u_projTrans * vec4(a_position, 1.0);
}


fragment:

#version 120
in vec4 v_color;
in vec2 v_texCoord0;

uniform sampler2D u_sampler2D;
uniform mat4 u_projTrans;

void main() {

        vec3 color = texture2D(u_sampler2D, v_texCoord0).rgb;
        vec4 colorAlpha = texture2D(u_sampler2D, v_texCoord0);
        float gray = (color.r + color.g + color.b) / 3.0;
        vec3 grayscale = vec3(gray);
     
    gl_FragColor = vec4(grayscale, colorAlpha.a);
}

and i have still errors:

Exception in thread "main-AWTAnimator#00" com.jogamp.opengl.util.AnimatorBase$UncaughtAnimatorException: com.jogamp.opengl.GLException: Caught IllegalArgumentException: Error compiling shader: ERROR: 0:1: '' :  #version required and missing.
ERROR: 0:1: 'attribute' : syntax error: syntax error
ERROR: 0:1: '' :  #version required and missing.
ERROR: 0:7: 'varying' : syntax error: syntax error
 on thread main-AWTAnimator#00
        at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:84)
        at com.jogamp.opengl.util.AnimatorBase.display(AnimatorBase.java:451)
        at com.jogamp.opengl.util.Animator$MainLoop.run(Animator.java:198)
        at java.lang.Thread.run(Thread.java:745)
Caused by: com.jogamp.opengl.GLException: Caught IllegalArgumentException: Error compiling shader: ERROR: 0:1: '' :  #version required and missing.
ERROR: 0:1: 'attribute' : syntax error: syntax error
ERROR: 0:1: '' :  #version required and missing.
ERROR: 0:7: 'varying' : syntax error: syntax error
 on thread main-AWTAnimator#00
        at com.jogamp.opengl.GLException.newGLException(GLException.java:76)
        at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1311)
        at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1131)
        at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:680)
        at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:77)
        ... 3 more
Caused by: java.lang.IllegalArgumentException: Error compiling shader: ERROR: 0:1: '' :  #version required and missing.
ERROR: 0:1: 'attribute' : syntax error: syntax error
ERROR: 0:1: '' :  #version required and missing.
ERROR: 0:7: 'varying' : syntax error: syntax error

        at com.badlogic.gdx.graphics.g2d.SpriteBatch.createDefaultShader(SpriteBatch.java:157)
        at com.badlogic.gdx.graphics.g2d.SpriteBatch.<init>(SpriteBatch.java:120)
        at com.badlogic.gdx.graphics.g2d.SpriteBatch.<init>(SpriteBatch.java:73)
        at com.mygdx.game.MyGdxGame.create(MyGdxGame.java:18)
        at com.badlogic.gdx.backends.jogamp.JoglGraphics.init(JoglGraphics.java:88)
        at jogamp.opengl.GLDrawableHelper.init(GLDrawableHelper.java:641)
        at jogamp.opengl.GLDrawableHelper.init(GLDrawableHelper.java:663)
        at jogamp.opengl.GLAutoDrawableBase$1.run(GLAutoDrawableBase.java:430)
        at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1275)
        ... 6 more
AL lib: (EE) alc_cleanup: 1 device not closed