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 #include "common_world.glsl"
  13
  14 void main()
  15 {
  16    vec3 vfrag = vec3(0.5,0.5,0.5);
  17
  18    // ws modulation
  19    vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );
  20
  21    // Creating normal patches
  22    vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;
  23    vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);
  24    vec2 dir = normalize(qnorm.xz);
  25    vec2 uvdiffuse = aCo.xz * 0.02;
  26    uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;
  27
  28    // Patch local noise
  29    vec4 rgarbage = texture( uTexGarbage, uvdiffuse );
  30
  31    // Colour blending
  32    float amtgrass = step(qnorm.y,0.6);
  33    float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);
  34    vec2 uvgradients = aUv + vec2( amtgrass*0.5 + rgarbage.a*0.4, 0.0 );
  35    vfrag = texture( uTexGradients, uvgradients ).rgb;
  36    vfrag = mix( vfrag, vec3(1.0,0.9,0.8), amtsand );
  37
  38    // Lighting
  39    vec3 halfview = normalize( uCamera - aCo );
  40    vfrag = do_light_diffuse( vfrag, qnorm );
  41    vfrag = do_light_spec( vfrag, qnorm, halfview, 0.2 * rgarbage.a );
  42    vfrag = do_light_shadowing( vfrag );
  43
  44    FragColor = vec4( vfrag, 1.0 );
  45 }