# Test proper behavior of the isnan(vec4) function.
#
# Note: testing behavior if isnan() is challenging because the GLSL
# 1.30 spec does not explicitly define any circumstances under which
# NaN values are required to be generated.  This test assumes that the
# expression 0.0/0.0 produces a NaN value when evaluated in the
# shader.

[require]
GLSL >= 1.30

[vertex shader]
#version 130
void main()
{
  gl_Position = gl_Vertex;
}

[fragment shader]
#version 130
uniform vec4 numerator;
uniform vec4 denominator;

void main()
{
  gl_FragColor = vec4(isnan(numerator/denominator));
}

[test]
uniform vec4 numerator 1.0 0.0 0.0 1.0
uniform vec4 denominator 1.0 0.0 0.0 1.0
draw rect -1 -1 2 2
probe rgba 0 0 0.0 1.0 1.0 0.0
uniform vec4 numerator 0.0 1.0 1.0 0.0
uniform vec4 denominator 0.0 1.0 1.0 0.0
draw rect -1 -1 2 2
probe rgba 1 0 1.0 0.0 0.0 1.0