shaders/terrain.fs

   1 out vec4 FragColor;
   2
   3 uniform sampler2D uTexGarbage;
   4 uniform sampler2D uTexGradients;
   5 uniform vec3 uCamera;
   6 uniform vec3 uSandColour;
   7 uniform vec2 uBlendOffset;
   8
   9 in vec4 aColour;
  10 in vec2 aUv;
  11 in vec3 aNorm;
  12 in vec3 aCo;
  13 in vec3 aWorldCo;
  14
  15 #include "common_world.glsl"
  16
  17 void main()
  18 {
  19    vec3 vfrag = vec3(0.5,0.5,0.5);
  20
  21    // ws modulation
  22    vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );
  23
  24    // Creating normal patches
  25    vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;
  26    vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);
  27    vec2 dir = normalize(qnorm.xz);
  28    vec2 uvdiffuse = aCo.xz * 0.02;
  29    uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;
  30
  31    // Patch local noise
  32    vec4 rgarbage = texture( uTexGarbage, uvdiffuse );
  33
  34    // Colour blending
  35    float amtgrass = step(qnorm.y,0.6);
  36    float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);
  37    vec2 uvgradients = aUv + vec2( amtgrass + rgarbage.a*0.8 )*uBlendOffset;
  38    vfrag = texture( uTexGradients, uvgradients ).rgb;
  39    vfrag = mix( vfrag, uSandColour, amtsand );
  40
  41    qnorm = mix( qnorm, aNorm, amtsand );
  42
  43    if( g_light_preview == 1 )
  44    {
  45       vfrag = vec3(0.5);
  46    }
  47
  48    // Lighting
  49    vec3 halfview = uCamera - aCo;
  50    float fdist = length( halfview );
  51    halfview /= fdist;
  52
  53    vfrag = do_light_diffuse( vfrag, qnorm );
  54    vfrag = do_light_spec( vfrag, qnorm, halfview, 0.1 );
  55    vfrag = do_light_shadowing( vfrag );
  56    vfrag = apply_fog( vfrag, fdist );
  57
  58    FragColor = vec4(vfrag, 1.0 );
  59 }