shaders/vblend.fs

   1 out vec4 FragColor;
   2
   3 uniform sampler2D uTexGarbage;
   4 uniform sampler2D uTexGradients;
   5 uniform sampler2D uTexDepth;
   6 uniform vec4 uDepthBounds;
   7 uniform vec3 uCamera;
   8 uniform vec4 uPlane;
   9
  10 in vec4 aColour;
  11 in vec2 aUv;
  12 in vec3 aNorm;
  13 in vec3 aCo;
  14
  15 float water_depth( vec3 pos, vec3 dir, vec4 plane )
  16 {
  17    float d = dot( plane.xyz, dir );
  18    float t = dot((plane.xyz*plane.w - pos),plane.xyz) / d;
  19    return t*0.04;
  20 }
  21
  22 float sample_height( vec3 pos )
  23 {
  24    vec2 depth_coords = (pos.xz-uDepthBounds.xy)*uDepthBounds.zw;
  25    return texture( uTexDepth, depth_coords ).r;
  26 }
  27
  28 float create_shadowing( vec3 vdir )
  29 {
  30    return clamp( sample_height( aCo+vdir ) - (aCo.y+vdir.y), 0.1, 0.2 )-0.1;
  31 }
  32
  33 void main()
  34 {
  35    vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.160 );
  36
  37    // Creating normal patches
  38    vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;
  39    vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);
  40
  41    vec3 tangent0 = normalize(cross(qnorm,vec3(0.0,1.0,0.0)));
  42    vec3 tangent1 = cross(qnorm,tangent0);
  43    vec2 uvdiffuse = vec2( dot(tangent0,aCo), dot(tangent1,aCo) ) * 0.160;
  44
  45    // Patch local noise
  46    vec4 rgarbage = texture( uTexGarbage, uvdiffuse );
  47
  48    // Colour blending
  49    float fblendclip = step(0.380,aColour.r + (rgarbage.r-0.5)*-1.740)*0.320;
  50    vec2 uvgradients = aUv + vec2( fblendclip, 0.0 );
  51
  52    vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;
  53    diffuse -= rgarbage.a*0.04;
  54
  55    // Lighting
  56    vec3 lightdir = normalize(vec3(0.5,0.5,-0.1));
  57    vec3 shadow = vec3(0.27,0.25,0.34);
  58    float light1 = dot( lightdir, aNorm )*0.5+0.5;
  59    diffuse = diffuse * (light1*vec3(1.0,0.96,0.9)*1.2 + shadow*(1.0-light1));
  60
  61    // Specular lighting
  62    vec3 halfview = normalize( uCamera - aCo );
  63    vec3 specdir = reflect( -lightdir, qnorm );
  64    float spec = pow(max(dot(halfview,specdir),0.0),10.0) * 0.3*rgarbage.r;
  65    //diffuse += spec * vec3(1.0,0.8,0.8);
  66
  67    float faccum = 0.0;
  68    vec3 offs = vec3(rgarbage.x, 0.0, rgarbage.z)*4.0;
  69    faccum += create_shadowing( vec3( 0.0, 0.5, 0.0 )*0.6);
  70    faccum += create_shadowing( vec3( 2.0, 0.3, 0.0 )*0.6);
  71    faccum += create_shadowing( vec3( 3.0, 1.0, 0.0 )*0.6);
  72    faccum += create_shadowing( vec3( 5.0, 1.0, 0.0 )*0.6);
  73    faccum += create_shadowing( vec3( 0.0, 0.5, 0.0 )*0.6*1.5+offs);
  74    faccum += create_shadowing( vec3( 2.0, 0.3, 0.0 )*0.6*1.5);
  75    faccum += create_shadowing( vec3( 3.0, 1.0, 0.0 )*0.6*1.5-offs);
  76    faccum += create_shadowing( vec3( 5.0, 1.0, 0.0 )*0.6*1.5);
  77    diffuse = mix( diffuse, vec3(0.15,0.1,0.2), min(faccum*1.0,1.0));
  78
  79    FragColor = vec4(diffuse, water_depth(aCo,halfview,uPlane));
  80 }