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uniform mat4 worldViewProjection;
uniform mat4 world;
uniform mat4 view;

uniform vec3 sunPos;

attribute vec4 position;
attribute vec3 normal;

varying vec4 v_pos;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

void main() {
  gl_Position = worldViewProjection * position;
  v_normal = (world * vec4(normal, 0)).xyz;
  vec3 worldPos = (world * position).xyz;
  v_sun = sunPos - worldPos;
  v_view = (view[3].xyz- worldPos);
  v_pos = gl_Position;
}

// #o3d SplitMarker

varying vec4 v_pos;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

vec4 lit(float l, float h, float m) {
  return vec4(1.0,
              max(l, 0.0),
              (l > 0.0) ? pow(max(0.0, h), m) : 0.0,
              1.0);
}

void main() {
  vec3 norm = normalize(v_normal);
  vec3 sun = normalize(v_sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1.0 - sqrt(abs(light));
  dayNight = dayNight * dayNight;
  dayNight = (1.0 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0.0, 1.0);
  vec3 view = normalize(v_view);
  vec3 r = normalize(reflect(norm, sun));
  vec4 litR = vec4(lit(light, dot(r, view), 0.0).y);
  vec3 day = vec3(0.5, 0.5, 1.0) * litR.y + vec3(1,1,1) * litR.z;
  vec3 night = vec3(0.2, 0.2, 0.5);
  gl_FragColor = vec4(mix(night, day, dayNight),1);
}

// #o3d MatrixLoadOrder RowMajor

uniform mat4 worldViewProjection;
uniform mat4 world;
uniform mat4 view;

uniform vec3 sunPos;

attribute vec4 position;
attribute vec3 normal;
attribute vec2 texCoord0;

varying vec2 v_uv;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

void main() {
  gl_Position = (worldViewProjection * position);
  v_uv = texCoord0;
  v_normal = (world * vec4(normal, 0)).xyz;
  vec3 worldPos = (world * position).xyz;
  v_sun = sunPos - worldPos;
  v_view = (view[3].xyz - worldPos);
}

// #o3d SplitMarker

uniform float time;

uniform sampler2D daySampler;

varying vec2 v_uv;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

vec4 lit(float l, float h, float m) {
  return vec4(1.0,
              max(l, 0.0),
              (l > 0.0) ? pow(max(0.0, h), m) : 0.0,
              1.0);
}

void main() {
  vec3 norm = normalize(v_normal);
  vec3 sun = normalize(v_sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1.0 - sqrt(abs(light));
  dayNight = dayNight * dayNight;
  dayNight = (1.0 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0.0, 1.0);
  vec3 view = normalize(v_view);
  vec3 r = normalize(reflect(norm, sun));
  vec4 litR = vec4(lit(light, dot(r, view), 0.0).y);
  vec3 earth = texture2D(daySampler, v_uv).xyz;
  vec3 day = mix(vec3(0.5, 0.5, 1.0), earth, time);
  day = day * litR.y + vec3(1,1,1) * litR.z;
  vec3 night = mix(vec3(0.2, 0.2, 0.5), earth * 0.3, time);
  gl_FragColor = vec4(mix(night, day, dayNight),1);
}

// #o3d MatrixLoadOrder RowMajor

uniform mat4 worldViewProjection;
uniform mat4 world;
uniform mat4 view;

uniform vec3 sunPos;

attribute vec4 position;
attribute vec3 normal;
attribute vec2 texCoord0;

varying vec2 v_uv;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

void main() {
  gl_Position = worldViewProjection * position;
  v_uv = texCoord0;
  v_normal = (world * vec4(normal, 0)).xyz;
  vec3 worldPos = (world * position).xyz;
  v_sun = sunPos - worldPos;
  v_view = (view[3].xyz - worldPos);
}

// #o3d SplitMarker

uniform float time;

uniform sampler2D daySampler;
uniform sampler2D nightSampler;

varying vec2 v_uv;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

vec4 lit(float l, float h, float m) {
  return vec4(1.0,
              max(l, 0.0),
              (l > 0.0) ? pow(max(0.0, h), m) : 0.0,
              1.0);
}

void main() {
  vec3 norm = normalize(v_normal);
  vec3 sun = normalize(v_sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1.0 - sqrt(abs(light));
  dayNight = dayNight * dayNight;
  dayNight = (1.0 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0.0, 1.0);
  vec3 view = normalize(v_view);
  vec3 r = normalize(reflect(norm, sun));
  vec4 litR = vec4(lit(light, dot(r, view), 0.0).y);
  vec3 earth = texture2D(daySampler, v_uv).xyz;
  vec3 day = texture2D(daySampler, v_uv).xyz;
  vec3 night = mix(day * 0.3, texture2D(nightSampler, v_uv).xyz, time);
  day = day * litR.y + vec3(1,1,1) * litR.z;
  gl_FragColor = vec4(mix(night, day, dayNight),1);
}

// #o3d MatrixLoadOrder RowMajor

uniform mat4 worldViewProjection;
uniform mat4 world;
uniform mat4 view;

uniform vec3 sunPos;

attribute vec4 position;
attribute vec3 normal;
attribute vec2 texCoord0;

varying vec2 v_uv;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

// #o3d SplitMarker

uniform float time;

uniform sampler2D daySampler;
uniform sampler2D nightSampler;
uniform sampler2D maskSampler;

varying vec2 v_uv;
varying vec3 v_normal;
varying vec3 v_sun;
varying vec3 v_view;

vec4 lit(float l, float h, float m) {
  return vec4(1.0,
              max(l, 0.0),
              (l > 0.0) ? pow(max(0.0, h), m) : 0.0,
              1.0);
}

void main() {
  vec3 norm = normalize(v_normal);
  vec3 sun = normalize(v_sun);
  float  light = dot(norm, sun);
  float  lightSign = sign(light);
  float  dayNight = 1.0 - sqrt(abs(light));
  dayNight = dayNight * dayNight;
  dayNight = (1.0 - dayNight) * lightSign;
  dayNight = clamp(dayNight, 0.0, 1.0);
  vec3 view = normalize(v_view);
  vec3 r = normalize(reflect(norm, sun));
  vec4 litR = vec4(lit(light, dot(r, view), 0.0).y);
  vec3 earth = texture2D(daySampler, v_uv).xyz;
  vec4 mask = texture2D(maskSampler, v_uv);
  vec3 day = mix(texture2D(daySampler, v_uv).xyz,
                    mask.xyz, time);
  vec3 night = texture2D(nightSampler, v_uv).xyz;
  day = day * litR.y + vec3(1,1,1) * litR.z * (1.0 - mask.w * time);
  vec3 color = mix(night, day, dayNight);
  gl_FragColor = vec4(color, 1);
}

// #o3d MatrixLoadOrder RowMajor