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[require] GLSL >= 1.20 [vertex shader file] glsl-mvp.vert [fragment shader] void main() { const float x = ceil(-0.5); const float y = ceil(0.0); const float z = ceil(0.5); gl_FragColor = vec4(x, y, z, 1.0); } [test] draw rect -1 -1 2 2 probe all rgb 0.0 0.0 1.0