Posted by AlanObject on Sep 18, 2014; 2:09pm
URL: https://forum.jogamp.org/RawGL2ES2demo-fails-on-the-Mac-tp4033162p4033164.html

This is the code from here: http://jogamp.org/git/?p=jogl-demos.git;a=blob;f=src/demos/es2/RawGL2ES2demo.java;hb=HEAD

The shader starts out like this (I left the line numbers in)

 109 private String vertexShaderString =
 110 // For GLSL 1 and 1.1 code i highly recomend to not include a
 111 // GLSL ES language #version line, GLSL ES section 3.4
 112 // Many GPU drivers refuse to compile the shader if #version is different from
 113 // the drivers internal GLSL version.
 114 //
 115 // This demo use GLSL version 1.1 (the implicit version)
 116
 117 "#if __VERSION__ >= 130\n" + // GLSL 130+ uses in and out
 118 "  #define attribute in\n" + // instead of attribute and varying
 119 "  #define varying out\n" +  // used by OpenGL 3 core and later.
 120 "#endif\n" +
 121
 122 "#ifdef GL_ES \n" +
 123 "precision mediump float; \n" + // Precision Qualifiers
 124 "precision mediump int; \n" +   // GLSL ES section 4.5.2
 125 "#endif \n" +
 126
 127 "uniform mat4    uniform_Projection; \n" + // Incomming data used by
 128 "attribute vec4  attribute_Position; \n" + // the vertex shader
 129 "attribute vec4  attribute_Color; \n" +    // uniform and attributes
 130
 131 "varying vec4    varying_Color; \n" + // Outgoing varying data
 132                                       // sent to the fragment shader
 133 "void main(void) \n" +
 134 "{ \n" +
 135 "  varying_Color = attribute_Color; \n" +
 136 "  gl_Position = uniform_Projection * attribute_Position; \n" +
 137 "} ";
 138

Then before it is used there is this code in the init method

 344         if(gl.isGL3core()){
 345             System.out.println("GL3 core detected: explicit add #version 130 to shaders");
 346             vertexShaderString = "#version 130\n"+vertexShaderString;
 347             fragmentShaderString = "#version 130\n"+fragmentShaderString;
 348         }

Since the Mac has a GL3 core the if statement resolves to true.  Taking this logic out ends up in a different shader compiler failure which says a version is needed.  I guess the question is which one?