shaders/vblend.h

   1 #ifndef SHADER_vblend_H
   2 #define SHADER_vblend_H
   3 static void shader_vblend_link(void);
   4 static void shader_vblend_register(void);
   5 static struct vg_shader _shader_vblend = {
   6    .name = "vblend",
   7    .link = shader_vblend_link,
   8    .vs =
   9 {
  10 .orig_file = "../shaders/terrain.vs",
  11 .static_src =
  12 "layout (location=0) in vec3 a_co;\n"
  13 "layout (location=1) in vec3 a_norm;\n"
  14 "layout (location=2) in vec4 a_colour;\n"
  15 "layout (location=3) in vec2 a_uv;\n"
  16 "\n"
  17 "#line      2        0 \n"
  18 "\n"
  19 "uniform mat4 uPv;\n"
  20 "uniform mat4x3 uMdl;\n"
  21 "\n"
  22 "out vec4 aColour;\n"
  23 "out vec2 aUv;\n"
  24 "out vec3 aNorm;\n"
  25 "out vec3 aCo;\n"
  26 "\n"
  27 "void main()\n"
  28 "{\n"
  29 "   gl_Position = uPv * vec4( uMdl * vec4(a_co,1.0), 1.0 );\n"
  30 "   aColour = a_colour;\n"
  31 "   aUv = a_uv;\n"
  32 "   aNorm = mat3(uMdl) * a_norm;\n"
  33 "   aCo = a_co;\n"
  34 "}\n"
  35 ""},
  36    .fs =
  37 {
  38 .orig_file = "../shaders/vblend.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform sampler2D uTexGarbage;\n"
  43 "uniform sampler2D uTexGradients;\n"
  44 "uniform sampler2D uTexDepth;\n"
  45 "uniform vec4 uDepthBounds;\n"
  46 "uniform vec3 uCamera;\n"
  47 "uniform vec4 uPlane;\n"
  48 "\n"
  49 "in vec4 aColour;\n"
  50 "in vec2 aUv;\n"
  51 "in vec3 aNorm;\n"
  52 "in vec3 aCo;\n"
  53 "\n"
  54 "float water_depth( vec3 pos, vec3 dir, vec4 plane )\n"
  55 "{\n"
  56 "   float d = dot( plane.xyz, dir );\n"
  57 "   float t = dot((plane.xyz*plane.w - pos),plane.xyz) / d;\n"
  58 "   return t*0.04;\n"
  59 "}\n"
  60 "\n"
  61 "float sample_height( vec3 pos )\n"
  62 "{\n"
  63 "   vec2 depth_coords = (pos.xz-uDepthBounds.xy)*uDepthBounds.zw;\n"
  64 "   return texture( uTexDepth, depth_coords ).r;\n"
  65 "}\n"
  66 "\n"
  67 "float create_shadowing( vec3 vdir )\n"
  68 "{\n"
  69 "   return clamp( sample_height( aCo+vdir ) - (aCo.y+vdir.y), 0.1, 0.2 )-0.1;\n"
  70 "}\n"
  71 "\n"
  72 "void main()\n"
  73 "{\n"
  74 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.160 );\n"
  75 "   \n"
  76 "   // Creating normal patches\n"
  77 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
  78 "   vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);\n"
  79 "\n"
  80 "   vec3 tangent0 = normalize(cross(qnorm,vec3(0.0,1.0,0.0)));\n"
  81 "   vec3 tangent1 = cross(qnorm,tangent0);\n"
  82 "   vec2 uvdiffuse = vec2( dot(tangent0,aCo), dot(tangent1,aCo) ) * 0.160;\n"
  83 "   \n"
  84 "   // Patch local noise\n"
  85 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
  86 "\n"
  87 "   // Colour blending\n"
  88 "   float fblendclip = step(0.380,aColour.r + (rgarbage.r-0.5)*-1.740)*0.320;\n"
  89 "   vec2 uvgradients = aUv + vec2( fblendclip, 0.0 );\n"
  90 "\n"
  91 "   vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;\n"
  92 "   diffuse -= rgarbage.a*0.04;\n"
  93 "\n"
  94 "   // Lighting\n"
  95 "   vec3 lightdir = normalize(vec3(0.5,0.5,-0.1));\n"
  96 "   vec3 shadow = vec3(0.27,0.25,0.34);\n"
  97 "   float light1 = dot( lightdir, aNorm )*0.5+0.5;\n"
  98 "   diffuse = diffuse * (light1*vec3(1.0,0.96,0.9)*1.2 + shadow*(1.0-light1));\n"
  99 "   \n"
 100 "   // Specular lighting\n"
 101 "   vec3 halfview = normalize( uCamera - aCo );\n"
 102 "   vec3 specdir = reflect( -lightdir, qnorm );\n"
 103 "   float spec = pow(max(dot(halfview,specdir),0.0),10.0) * 0.3*rgarbage.r;\n"
 104 "   //diffuse += spec * vec3(1.0,0.8,0.8);\n"
 105 "\n"
 106 "   float faccum = 0.0;\n"
 107 "   vec3 offs = vec3(rgarbage.x, 0.0, rgarbage.z)*4.0;\n"
 108 "   faccum += create_shadowing( vec3( 0.0, 0.5, 0.0 )*0.6);\n"
 109 "   faccum += create_shadowing( vec3( 2.0, 0.3, 0.0 )*0.6);\n"
 110 "   faccum += create_shadowing( vec3( 3.0, 1.0, 0.0 )*0.6);\n"
 111 "   faccum += create_shadowing( vec3( 5.0, 1.0, 0.0 )*0.6);\n"
 112 "   faccum += create_shadowing( vec3( 0.0, 0.5, 0.0 )*0.6*1.5+offs);\n"
 113 "   faccum += create_shadowing( vec3( 2.0, 0.3, 0.0 )*0.6*1.5);\n"
 114 "   faccum += create_shadowing( vec3( 3.0, 1.0, 0.0 )*0.6*1.5-offs);\n"
 115 "   faccum += create_shadowing( vec3( 5.0, 1.0, 0.0 )*0.6*1.5);\n"
 116 "   diffuse = mix( diffuse, vec3(0.15,0.1,0.2), min(faccum*1.0,1.0));\n"
 117 "\n"
 118 "   FragColor = vec4(diffuse, water_depth(aCo,halfview,uPlane));\n"
 119 "}\n"
 120 ""},
 121 };
 122
 123 static GLuint _uniform_vblend_uPv;
 124 static GLuint _uniform_vblend_uMdl;
 125 static GLuint _uniform_vblend_uTexGarbage;
 126 static GLuint _uniform_vblend_uTexGradients;
 127 static GLuint _uniform_vblend_uTexDepth;
 128 static GLuint _uniform_vblend_uDepthBounds;
 129 static GLuint _uniform_vblend_uCamera;
 130 static GLuint _uniform_vblend_uPlane;
 131 static void shader_vblend_uPv(m4x4f m){
 132    glUniformMatrix4fv( _uniform_vblend_uPv, 1, GL_FALSE, (float *)m );
 133 }
 134 static void shader_vblend_uMdl(m4x3f m){
 135    glUniformMatrix4x3fv( _uniform_vblend_uMdl, 1, GL_FALSE, (float *)m );
 136 }
 137 static void shader_vblend_uTexGarbage(int i){
 138    glUniform1i( _uniform_vblend_uTexGarbage, i );
 139 }
 140 static void shader_vblend_uTexGradients(int i){
 141    glUniform1i( _uniform_vblend_uTexGradients, i );
 142 }
 143 static void shader_vblend_uTexDepth(int i){
 144    glUniform1i( _uniform_vblend_uTexDepth, i );
 145 }
 146 static void shader_vblend_uDepthBounds(v4f v){
 147    glUniform4fv( _uniform_vblend_uDepthBounds, 1, v );
 148 }
 149 static void shader_vblend_uCamera(v3f v){
 150    glUniform3fv( _uniform_vblend_uCamera, 1, v );
 151 }
 152 static void shader_vblend_uPlane(v4f v){
 153    glUniform4fv( _uniform_vblend_uPlane, 1, v );
 154 }
 155 static void shader_vblend_register(void){
 156    vg_shader_register( &_shader_vblend );
 157 }
 158 static void shader_vblend_use(void){ glUseProgram(_shader_vblend.id); }
 159 static void shader_vblend_link(void){
 160    _uniform_vblend_uPv = glGetUniformLocation( _shader_vblend.id, "uPv" );
 161    _uniform_vblend_uMdl = glGetUniformLocation( _shader_vblend.id, "uMdl" );
 162    _uniform_vblend_uTexGarbage = glGetUniformLocation( _shader_vblend.id, "uTexGarbage" );
 163    _uniform_vblend_uTexGradients = glGetUniformLocation( _shader_vblend.id, "uTexGradients" );
 164    _uniform_vblend_uTexDepth = glGetUniformLocation( _shader_vblend.id, "uTexDepth" );
 165    _uniform_vblend_uDepthBounds = glGetUniformLocation( _shader_vblend.id, "uDepthBounds" );
 166    _uniform_vblend_uCamera = glGetUniformLocation( _shader_vblend.id, "uCamera" );
 167    _uniform_vblend_uPlane = glGetUniformLocation( _shader_vblend.id, "uPlane" );
 168 }
 169 #endif /* SHADER_vblend_H */