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[require] GLSL >= 1.20 [vertex shader file] glsl-mvp.vert [fragment shader] #version 120 void main() { const float one_half = sqrt(16.0) - 3.5; gl_FragColor = vec4(0.0, one_half, 0.0, 1.0); } [test] clear color 0.0 0.0 0.0 0.0 clear ortho draw rect 10 10 10 10 probe rgb 15 15 0.0 0.5 0.0