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float4x4 worldViewProjection : WorldViewProjection;
float4x4 world : World;
float4x4 view : View;

float3 sunPos;

struct a2v {
  float4 pos : POSITION;
  float3 normal : NORMAL;
};

struct v2f {
  float4 pos : POSITION;
  float3 normal : TEXCOORD0;
  float3 sun : TEXCOORD1;
  float3 view : TEXCOORD2;
};

v2f vsMain(a2v IN) {
  v2f OUT;

OUT.pos = mul(IN.pos, worldViewProjection);
  OUT.normal = mul(float4(IN.normal, 0), world).xyz;
  float3 worldPos = mul(IN.pos, world).xyz;
  OUT.sun = sunPos - worldPos;
  OUT.view = (view[3] - worldPos);

return OUT;
}

float4 psMain(v2f IN): COLOR {
  float3 norm = normalize(IN.normal);
  float3 sun = normalize(IN.sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1 - sqrt(light);
  dayNight = dayNight * dayNight;
  dayNight = (1 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0, 1);
  float3 view = normalize(IN.view);
  float3 r = normalize(reflect(norm, sun));
  float4 litR = lit(light, dot(r, view), 0.0).y;
  float3 day = float3(0.5, 0.5, 1.0) * litR.y + float3(1,1,1) * litR.z;
  float3 night = float3(0.2, 0.2, 0.5);
  return float4(lerp(night, day, dayNight),1);
}

// #o3d VertexShaderEntryPoint vsMain
// #o3d PixelShaderEntryPoint psMain
// #o3d MatrixLoadOrder RowMajor

float4x4 worldViewProjection : WorldViewProjection;
float4x4 world : World;
float4x4 view : View;

float3 sunPos;
float mix;

sampler2D daySampler;

struct a2v {
  float4 pos : POSITION;
  float3 normal : NORMAL;
  float2 uv : TEXCOORD0;
};

struct v2f {
  float4 pos : POSITION;
  float2 uv : TEXCOORD0;
  float3 normal : TEXCOORD1;
  float3 sun : TEXCOORD2;
  float3 view : TEXCOORD3;
};

v2f vsMain(a2v IN) {
  v2f OUT;

OUT.pos = mul(IN.pos, worldViewProjection);
  OUT.uv = IN.uv;
  OUT.normal = mul(float4(IN.normal, 0), world).xyz;
  float3 worldPos = mul(IN.pos, world).xyz;
  OUT.sun = sunPos - worldPos;
  OUT.view = (view[3] - worldPos);

return OUT;
}

float4 psMain(v2f IN): COLOR {
  float3 norm = normalize(IN.normal);
  float3 sun = normalize(IN.sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1 - sqrt(light);
  dayNight = dayNight * dayNight;
  dayNight = (1 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0, 1);
  float3 view = normalize(IN.view);
  float3 r = normalize(reflect(norm, sun));
  float4 litR = lit(light, dot(r, view), 0.0).y;
  float3 earth = tex2D(daySampler, IN.uv).xyz;
  float3 day = lerp(float3(0.5, 0.5, 1.0), earth, mix);
  day = day * litR.y + float3(1,1,1) * litR.z;
  float3 night = lerp(float3(0.2, 0.2, 0.5), earth * 0.3, mix);
  return float4(lerp(night, day, dayNight),1);
}

// #o3d VertexShaderEntryPoint vsMain
// #o3d PixelShaderEntryPoint psMain
// #o3d MatrixLoadOrder RowMajor

float4x4 worldViewProjection : WorldViewProjection;
float4x4 world : World;
float4x4 view : View;

float3 sunPos;
float mix;

sampler2D daySampler;
sampler2D nightSampler;

struct a2v {
  float4 pos : POSITION;
  float3 normal : NORMAL;
  float2 uv : TEXCOORD0;
};

struct v2f {
  float4 pos : POSITION;
  float2 uv : TEXCOORD0;
  float3 normal : TEXCOORD1;
  float3 sun : TEXCOORD2;
  float3 view : TEXCOORD3;
};

v2f vsMain(a2v IN) {
  v2f OUT;

return OUT;
}

float4 psMain(v2f IN): COLOR {
  float3 norm = normalize(IN.normal);
  float3 sun = normalize(IN.sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1 - sqrt(light);
  dayNight = dayNight * dayNight;
  dayNight = (1 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0, 1);
  float3 view = normalize(IN.view);
  float3 r = normalize(reflect(norm, sun));
  float4 litR = lit(light, dot(r, view), 0.0).y;
  float3 earth = tex2D(daySampler, IN.uv).xyz;
  float3 day = tex2D(daySampler, IN.uv).xyz;
  float3 night = lerp(day * 0.3, tex2D(nightSampler, IN.uv).xyz, mix);
  day = day * litR.y + float3(1,1,1) * litR.z;
  return float4(lerp(night, day, dayNight),1);
}

// #o3d VertexShaderEntryPoint vsMain
// #o3d PixelShaderEntryPoint psMain
// #o3d MatrixLoadOrder RowMajor

float4x4 worldViewProjection : WorldViewProjection;
float4x4 world : World;
float4x4 view : View;

float3 sunPos;
float mix;

sampler2D daySampler;
sampler2D nightSampler;
sampler2D maskSampler;

struct a2v {
  float4 pos : POSITION;
  float3 normal : NORMAL;
  float2 uv : TEXCOORD0;
};

struct v2f {
  float4 pos : POSITION;
  float2 uv : TEXCOORD0;
  float3 normal : TEXCOORD1;
  float3 sun : TEXCOORD2;
  float3 view : TEXCOORD3;
};

v2f vsMain(a2v IN) {
  v2f OUT;

return OUT;
}

float4 psMain(v2f IN): COLOR {
  float3 norm = normalize(IN.normal);
  float3 sun = normalize(IN.sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1 - sqrt(light);
  dayNight = dayNight * dayNight;
  dayNight = (1 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0, 1);
  float3 view = normalize(IN.view);
  float3 r = normalize(reflect(norm, sun));
  float4 litR = lit(light, dot(r, view), 0.0).y;
  float3 earth = tex2D(daySampler, IN.uv).xyz;
  float4 mask = tex2D(maskSampler, IN.uv);
  float3 day = lerp(tex2D(daySampler, IN.uv).xyz,
                    mask.xyz, mix);
  float3 night = tex2D(nightSampler, IN.uv).xyz;
  day = day * litR.y + float3(1,1,1) * litR.z * (1 - mask.w * mix);

float3 color = lerp(night, day, dayNight);
  return float4(color,1);
}

// #o3d VertexShaderEntryPoint vsMain
// #o3d PixelShaderEntryPoint psMain
// #o3d MatrixLoadOrder RowMajor