[require] GLSL >= 1.20 [vertex shader file] glsl-mvp.vert [fragment shader] #version 120 void main() { const bvec3 res = equal(bvec3(false, true, false), bvec3(false, false, true)); gl_FragColor = (res == bvec3(true, false, false)) ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0); } [test] clear color 0.0 0.0 0.0 0.0 clear ortho draw rect 10 10 10 10 probe rgb 15 15 0.0 1.0 0.0