KlassischeKeplerKriege/data/shader/gameobjects.frag

#version 120

varying vec3  vertex;
varying vec3  normal;
varying vec3  lightDirection;

uniform vec3  lightColor;
uniform vec3  lightPosition;
uniform vec3  materialColor;
uniform int   materialKind;
uniform int   materialSeed;

void main()
{
  vec3 Eye       = normalize(-vertex);
  vec3 Reflected = normalize(reflect( -lightPosition, normal));

  vec3 IAmbient  = vec3(0.05f);

  if (materialKind == 6) {
      // sun: shines by itself
      gl_FragColor = vec4(materialColor, 1.0);
      return;
  }

    // TODO: add noise texture
  vec3 color = materialColor;
  color = max(vec3(0.0), min(vec3(1.0), color));

  vec3 IDiffuse  = vec3(color) * lightColor * max(dot(normal, lightDirection), 0.0);

  // TODO make instensity/exponent as parameter
  //vec3 ISpecular = lightColor * 5.0 * pow(max(dot(Reflected, Eye), 0.0), 2.0);
  //vec3 ISpecular = lightColor * pow(max(dot(Reflected, Eye), 0.0), 2.0);

  //gl_FragColor   = vec4((IAmbient + IDiffuse) + ISpecular, 1.0);
  gl_FragColor   = vec4((IAmbient + IDiffuse), 1.0);
}