Provides a screen to draw pixels to with a basic rendering update loop and accepts user input
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PixelEngine/lib/bin/jogamp/graph/curve/opengl/shader/curverenderer01-pass2-msaa....

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// Pass-2: Dump Texture
vec4 t = texture2D(gcu_FboTexUnit, gcv_FboTexCoord.st);
#if 0
if( 0.0 == t.a ) {
discard; // discard freezes NV tegra2 compiler
}
#endif
mgl_FragColor = t;