[require]
GLSL >= 1.10

[vertex shader]
varying vec3 color;
uniform vec4 v1;
uniform float v2;
uniform float v3;

void main()
{
        gl_Position = gl_Vertex;

	color.xyz = v1.xyz;
	color.y = v2;
	color.z = v3;
}

[fragment shader]
varying vec3 color;

void main()
{
        gl_FragColor = vec4(color, 0.4);
}

[test]
uniform vec4  v1 0.1 0.9 0.9
uniform float v2 0.2
uniform float v3 0.3

draw rect -1 -1 2 2

probe all rgba 0.1 0.2 0.3 0.4