[require]
GLSL >= 1.10

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

[fragment shader]

uniform vec4 color;

void main()
{
	vec4 c = color;
	if (color.w < 0.0) {
		discard;
	}

	gl_FragColor = c;
}

[test]
uniform vec4 color 0.0 1.0 0.0 0.0
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 0.0