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[require] GLSL >= 1.10 [vertex shader] void main() { vec4 color = vec4(0.0, 0.0, 0.0, 0.0); color.xzy.z = 1.0; gl_FrontColor = color; gl_Position = gl_Vertex; } [fragment shader] void main() { gl_FragColor = gl_Color; } [test] draw rect -1 -1 2 2 probe rgb 1 1 0.0 1.0 0.0