shaders/terrain.fs

   1 out vec4 FragColor;
   2
   3 uniform sampler2D uTexGarbage;
   4 uniform sampler2D uTexGradients;
   5 uniform vec3 uCamera;
   6
   7 in vec4 aColour;
   8 in vec2 aUv;
   9 in vec3 aNorm;
  10 in vec3 aCo;
  11
  12 void main()
  13 {
  14    vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );
  15    vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;
  16    vec3 qnorm = floor(aNorm*4.0+modnorm) * 0.25;
  17
  18    vec2 dir = normalize(qnorm.xz);
  19    vec2 uvdiffuse = aCo.xz * 0.02;
  20    uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;
  21
  22    vec4 rgarbage = texture( uTexGarbage, uvdiffuse );
  23    float amtgrass = step(qnorm.y,0.6);
  24    vec2 uvgradients = vec2( rgarbage.a, -amtgrass*0.125 ) + aUv;
  25    vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;
  26
  27    vec3 lightdir = vec3(0.95,0.0,-0.3);
  28    vec3 shadow = pow(vec3(0.014,0.034,0.084),vec3(1.0/3.2));
  29    float light1 = 1.0-(dot( lightdir, qnorm )*0.5+0.5);
  30
  31    qnorm = floor(aNorm*8.0)*0.125;
  32    vec3 viewdelta = normalize( uCamera - aCo );
  33    vec3 specdir = reflect( -lightdir, qnorm );
  34    float spec = pow(max(dot(viewdelta,specdir),0.0),10.0) * 0.2*rgarbage.r;
  35
  36    diffuse = diffuse*(1.0-light1)+diffuse*shadow*light1;
  37    FragColor = vec4(diffuse+spec, 1.0);
  38 }