struct Vertex {
    float4 pos : POSITION;
    float4 texcoord : TEXCOORD0;
};

struct VSOut {
    float4 pos : SV_POSITION;
    float4 texcoord : TEXCOORD0;
};

Texture2D gDiffuseTexture : register(t0);
SamplerState gSampler : register(s0);

cbuffer MatrixBuffer : register(b0) {
    float4x4 gProjectionMatrix;
    float4x4 gViewMatrix;
    float4x4 gModelMatrix;
    float4x4 gIT_ModelMatrix;
};

VSOut MainVS(Vertex v) {
    VSOut o;
    float4 positionWS = mul(gModelMatrix, v.pos);
    float4 positionVS = mul(gViewMatrix, positionWS);
    o.pos = mul(gProjectionMatrix, positionVS);
    o.texcoord = v.texcoord;
    return o;
}

float4 MainPS(VSOut i) : SV_TARGET {
    return gDiffuseTexture.Sample(gSampler, float2(i.texcoord.x, i.texcoord.y));
}