# [description]
# This test exercises a bug found in Mesa: taking the absolute value
# of -x should yield abs(x), not -abs(x).
#
# In this test, the intermediate value, -x, is also used in the
# shader.

[require]
GLSL >= 1.10

[vertex shader]
#version 110

uniform float x;

void main()
{
	gl_Position = gl_Vertex;

	float y = -x;
	float z = abs(y);
	gl_FrontColor = vec4(0.5 + x, 0.5 + y, 0.5 + z, 1.0);
}

[fragment shader]
#version 110

void main(void)
{
	gl_FragColor = gl_Color;
}

[test]
uniform float x 0.25
draw rect -1 -1 2 2
probe all rgba 0.75 0.25 0.75 1.0