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[require] GLSL >= 1.10 [vertex shader] void main() { gl_Position = gl_Vertex; } [fragment shader] void main() { mat2 matrix2 = mat2(0.1, 0.2, 0.3, 0.4); gl_FragColor = vec4(matrix2); } [test] draw rect -1 -1 2 2 probe all rgba 0.1 0.2 0.3 0.4