#include "graphics_structs.hlsli"


struct VS_Input
{
    uint VertexIndex        : SV_VertexID;
};

struct VS_Output
{
    float4 VertexPosition   : SV_Position;
    float3 WorldPosition    : POSITION;
};

VS_Output main(VS_Input StageInput)
{
    float3 Points[] =
    {
        float3(-1.0f, -1.0f, 1.0f),
        float3(3.0f, -1.0f, 1.0f),
        float3(-1.0f, 3.0f, 1.0f),
    };
    
    VS_Output StageOutput;
    StageOutput.VertexPosition = float4(Points[StageInput.VertexIndex], 1.0f);
    
    float4 ClipSpace = mul(Camera.InvProjection, float4(Points[StageInput.VertexIndex], 1.0f));
    float4 WorldSpace = mul(Camera.InvView, ClipSpace / ClipSpace.wwww);
    StageOutput.WorldPosition = WorldSpace.xyz;
    
    return StageOutput;
}