[require]
GLSL >= 1.10

[vertex shader]
/* this is a test for a bug in constructor handling in glsl2.  It
 * would evaluate the expression used in the constructor for each
 * channel it needed to pull out.
*/
vec4 color = vec4(0.0);

vec2 get_val()
{
	color += vec4(1.0, 1.0, 0.0, 0.0);
	return vec2(1.0, 0.0);
}

void main()
{
	vec4 val = vec4(get_val(), 0.0, 0.0);
	val += color;

	/* If the bug is present, val is (3,2,0,0), but it should be
	 * (2,1,0,0).
	 */
	gl_FrontColor = val - vec4(2.0, 0, 0.0, 0.0);
	gl_Position = gl_Vertex;
}

[fragment shader file]
glsl-color.frag

[test]
draw rect -1 -1 2 2
probe rgb 1 1 0.0 1.0 0.0