bad-interior-mapping.glsl

#version 130

// Some dead code for future reference.

uniform samplerCube p3d_Texture0;
uniform float time;
uniform vec3 camera_position;

// Input from vertex shader
in vec2 texcoord;
in vec4 screen_position;
in vec4 position;
in vec3 normal;

void main() {
  vec4 col = vec4(0.0);

  const float s  = 8.0;
                                                            // Define some shortcuts
  // Unused variable not cleaned up because this is dead code
  vec3 p   = position.xyz;                                  // Position in 3D world
  vec3 n   = normal;                                        // Normal vector
  vec3 up  = vec3(0.0,0.0,1.0);                             // Up vector
  vec3 c   = camera_position;
  vec3 ws  = (vec3(1.0)-abs(n));                            // Window surface
  vec3 wc  = floor(p / s - 0.5) * s + s;                    // Window center position in 3D world
  vec3 wr  = -ws * (vec3(1.0) - up);                        // Window right vector

  vec3 r = normalize(p-c);

  col += textureCube(p3d_Texture0, cubeClamp(r/length(r)) + (p - wc));

  float windows = 1.0;

  const float TAU = 6.2832;
  const float f = TAU / s;
  const float offset = 0;
  windows *= mix(clamp(cos(position.x * f + offset)/0.1, 0.0,1.0), 1.0, abs(n.x));
  windows *= mix(clamp(cos(position.y * f + offset)/0.1, 0.0,1.0), 1.0, abs(n.y));
  windows *= clamp(cos(position.z * f + offset)/0.1, 0.0,1.0);
  windows *= 1.0-abs(n.z);

  col *= windows;


  gl_FragColor = col;
}