uniform Colors
{
	vec4 color;
	float gray;
};
uniform sampler2D mask;
uniform Transform
{
	mat4 mvp;
} transform;

#pragma MSP stage(vertex)
layout(location=0) in vec4 position;
layout(location=1) in vec2 texcoord;
void main()
{
	passthrough;
	gl_Position = transform.mvp*position;
}

#pragma MSP stage(fragment)
layout(location=0) out vec4 frag_color;
void main()
{
	frag_color = texture(mask, texcoord).r > 0.5 ? color : gray;
}

/* Expected error:
<test>:25: Ternary operator has incompatible types 'vec4' and 'float'
*/