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[require] GLSL >= 1.10 [vertex shader] void main() { gl_Position = gl_Vertex; } [fragment shader] uniform vec4 arg0; void main() { gl_FragColor = max(vec4(0.25), arg0); } [test] uniform vec4 arg0 0.0 1.0 -1.0 0.0 draw rect -1 -1 2 2 probe all rgba 0.25 1.0 0.25 0.25