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[require] GLSL >= 1.50 GL_ARB_gpu_shader_fp64 [vertex shader passthrough] [fragment shader] #version 150 #extension GL_ARB_gpu_shader_fp64 : enable void main() { dvec4 red = dvec4(0.1, 0.0, 0.0, 1.0); red[0] = 1.0; gl_FragColor = vec4(red); } [test] draw rect -1 -1 2 2 probe all rgb 1.0 0.0 0.0