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[require] [vertex shader] void main() { gl_Position = gl_Vertex; } [fragment shader] void main() { for (int i = 0; i < 8; i++) { if (i > 4) { gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0); break; } gl_FragColor = vec4(1.0, 0.0, 0.0, 0.0); } } [test] draw rect -1 -1 2 2 relative probe rgb (0.03, 0.25) (0.0, 1.0, 0.0)