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[require] GLSL >= 1.20 [vertex shader file] glsl-mvp.vert [fragment shader] void main() { const bvec4 res = equal(vec4(-2.0, 0.0, 0.123, -1000.5), vec4(-2.4, 0.0, 0.456, 12.5)); gl_FragColor = (res == bvec4(false, true, false, false)) ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0); } [test] draw rect -1 -1 2 2 probe all rgb 0.0 1.0 0.0