[require]
GLSL >= 1.10

[vertex shader]
varying vec2 texcoords;

void main()
{
        gl_Position = gl_Vertex;
        texcoords = (gl_Vertex.xy + 1.0) / 2.0;
}

[fragment shader]
uniform sampler2D tex;
uniform float f;
varying vec2 texcoords;

void main()
{
	float a = texture2D(tex, texcoords).a;

	/* always false */
	if (f < 0.0)
		a *= 2.0;

	gl_FragColor = vec4(a);
}

[test]
uniform int tex 0
uniform float f 1.0
texture rgbw 0 (8, 8)
draw rect -1 -1 2 2
probe all rgba 1.0 1.0 1.0 1.0