[meta-freescale] Problem with shader compiler

[Erik Botö]

Hi,

I'm using meta-fsl-arm with an imx6 sabrelite board, kernel 3.0.35
+ gpu-viv-bin-mx6q_12.09.01.

I use the sysroot from poky to build Qt5, but then run in to some problems
with shaders. They seem to stem from the fact that the shader compiler
doesn't support #define and/or #ifdef.

Example:

QOpenGLShader::compile(Fragment): (5:0) : error : syntax error

*** Problematic Fragment shader source code ***
#ifndef GL_FRAGMENT_PRECISION_HIGH
#define highp mediump
#endif
uniform sampler2D texture;
varying highp vec2 textureCoord;
void main() {
   gl_FragColor = texture2D(texture, textureCoord).bgra;
}

***

It can be manually fixed by exchanging all occurences of highp with
mediump, instead of relying on the preprocessor macros. The shader compiler
should support this, right?

Best Regards,
Erik Botö
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