Marty McFly's Ambient Obscurance (MXAO) with IL

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Vertex Shader
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

struct MXAO_VSOUT
{
	float4              position    : SV_Position;
        float2              texcoord    : TEXCOORD0;
        float2              scaledcoord : TEXCOORD1;
        nointerpolation int samples     : TEXCOORD2;
        nointerpolation int blursamples : TEXCOORD3;
        float3              uvtoviewADD : TEXCOORD4;
        float3              uvtoviewMUL : TEXCOORD5;
};

MXAO_VSOUT VS_MXAO(in uint id : SV_VertexID)
{
        MXAO_VSOUT MXAO;

        MXAO.texcoord.x = (id == 2) ? 2.0 : 0.0;
        MXAO.texcoord.y = (id == 1) ? 2.0 : 0.0;
        MXAO.scaledcoord.xy = MXAO.texcoord.xy / MXAO_GLOBAL_RENDER_SCALE;
        MXAO.position = float4(MXAO.texcoord.xy * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);

        MXAO.samples   = 8;
        MXAO.blursamples = 3;

        int blurqualityTweak   = (MXAO_GLOBAL_RENDER_SCALE < 0.707) + MXAO_TWO_LAYER - MXAO_ENABLE_TSS;
        int samplequalityTweak = -MXAO_GLOBAL_SAMPLE_QUALITY_PRESET * 2 * MXAO_ENABLE_TSS;

        if(     MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 0) { MXAO.samples = 8   + samplequalityTweak; MXAO.blursamples = 3 + blurqualityTweak;}
        else if(MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 1) { MXAO.samples = 16  + samplequalityTweak; MXAO.blursamples = 3 + blurqualityTweak;}
        else if(MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 2) { MXAO.samples = 24  + samplequalityTweak; MXAO.blursamples = 2 + blurqualityTweak;}
        else if(MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 3) { MXAO.samples = 32  + samplequalityTweak; MXAO.blursamples = 2 + blurqualityTweak;}
        else if(MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 4) { MXAO.samples = 64  + samplequalityTweak; MXAO.blursamples = 2 + blurqualityTweak;}
        else if(MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 5) { MXAO.samples = 96  + samplequalityTweak; MXAO.blursamples = 1 + blurqualityTweak;}
        else if(MXAO_GLOBAL_SAMPLE_QUALITY_PRESET == 6) { MXAO.samples = 255 + samplequalityTweak; MXAO.blursamples = 0 + blurqualityTweak;}

        MXAO.blursamples = max(MXAO.blursamples,0);

        MXAO.uvtoviewADD = float3(-1.0,-1.0,1.0);
        MXAO.uvtoviewMUL = float3(2.0,2.0,0.0);

        //static const float FOV = 70.0;

        //MXAO.uvtoviewADD = float3(-tan(radians(FOV * 0.5)).xx,1.0);
        //MXAO.uvtoviewADD.y *= BUFFER_WIDTH * BUFFER_RCP_HEIGHT;
        //MXAO.uvtoviewMUL = float3(-2.0 * MXAO.uvtoviewADD.xy,0.0);

        return MXAO;
}