uniform sampler2D texColor <
    string type = "input";
>;
uniform sampler2D texTarget <
    string type = "output";
>;

// --------------------------------------------------------- \\

struct VS_INPUT
{
    vec4 pos;
    vec2 tex;
};
struct VS_OUTPUT
{
    vec4 pos;
    vec2 tex;
};

// --------------------------------------------------------- \\

void PostProcess_VS(in vec4 pos : 1, in vec2 tex, out VS_OUTPUT OUT)
{
    gl_Position = pos;

    OUT.pos = pos;
    OUT.tex = tex;
}
void PostProcess_PS_Target(in VS_OUTPUT OUT, out vec4 FragColor0 : 0)
{
    // 0 --> Rendertarget 1
    // 1 --> Rendertarget 2
    // ...

    FragColor0 = texture2D(texColor, OUT.tex) * vec4(OUT.tex, 1.0, 1.0);
}
void PostProcess_PS(in VS_OUTPUT OUT, out vec4 FragColor)
{
    vec4 color = texture2D(texTarget, OUT.tex);
    color.a = 1.0f;

    FragColor = color;
}

// --------------------------------------------------------- \\

technique PostProcess
{
    pass p0 < string output0 = "texTarget"; >
    {
        VertexShader = compile 420 PostProcess_VS();
        FragmentShader = compile 420 PostProcess_PS_Target();
    }
    pass p1
    {
        VertexShader = compile 420 PostProcess_VS();
        FragmentShader = compile 420 PostProcess_PS();
    }
}