Texture2D<float4> t0 : register(t0);

SamplerState s0_s : register(s0);

cbuffer cb0 : register(b0) {
  float4 cb0[3];
}

#ifndef FIX_BLUR_OFFSET
#define FIX_BLUR_OFFSET 1
#endif

void main(
    float4 v0: SV_POSITION0,
    float2 v1: TEXCOORD0,
    out float4 o0: SV_Target0) {
  float4 r0, r1, r2;

  // https://www.rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
  // GaussianOffset(3, 4, 220, 066);  // 3.230769230769231
  // GaussianOffset(1, 2, 792, 495);  // 1.3846153846153846
  // GaussianOffset(2, 4, 792, 495);  // 2.769230769230769
  // GaussianOffset(1, 0, 792, 495);  // 0.615384996
  // float weight1 = 0.316260993;
  // float weight2 = 0.0702700019;
  // float offset = -(weight1 * (1.38461494f + -0.615384996) + (weight2 * (3.23076892f + -2.76923108))) / 2.0f;
  float2 adjustedv1 = v1;

#if FIX_BLUR_OFFSET
  float offset = -0.137854845;
  adjustedv1 += cb0[2].xy * offset;
#endif

  r0.xyzw = cb0[2].xxxx * float4(3.23076892, 1.38461494, -2.76923108, -0.615384996) + adjustedv1.xxxx;
  r1.xz = r0.yw;
  r1.yw = adjustedv1.yy;
  r2.xyzw = t0.Sample(s0_s, r1.xy).xyzw;
  r1.xyzw = t0.Sample(s0_s, r1.zw).xyzw;
  r1.xyz = r2.xyz + r1.xyz;
  r1.xyz = float3(0.316260993, 0.316260993, 0.316260993) * r1.xyz;
  r2.xyzw = t0.Sample(s0_s, adjustedv1.xy).xyzw;
  r1.xyz = r2.xyz * float3(0.227026999, 0.227026999, 0.227026999) + r1.xyz;
  r0.yw = adjustedv1.yy;
  r2.xyzw = t0.Sample(s0_s, r0.xy).xyzw;
  r0.xyzw = t0.Sample(s0_s, r0.zw).xyzw;
  r0.xyz = r2.xyz + r0.xyz;
  o0.xyz = r0.xyz * float3(0.0702700019, 0.0702700019, 0.0702700019) + r1.xyz;
  o0.w = 1;
}