Provides a screen to draw pixels to with a basic rendering update loop and accepts user input
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// Pass-2: Dump Texture
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vec4 t = texture2D(gcu_FboTexUnit, gcv_FboTexCoord.st);
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#if 0
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if( 0.0 == t.a ) {
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discard; // discard freezes NV tegra2 compiler
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}
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#endif
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mgl_FragColor = t;
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