shaders/water.h

   1 #ifndef SHADER_water_H
   2 #define SHADER_water_H
   3 static void shader_water_link(void);
   4 static void shader_water_register(void);
   5 static struct vg_shader _shader_water = {
   6    .name = "water",
   7    .link = shader_water_link,
   8    .vs =
   9 {
  10 .orig_file = "../shaders/water.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 "uniform vec4 uDepthBounds;\n"
  22 "\n"
  23 "out vec4 aUv;\n"
  24 "out vec3 aCo;\n"
  25 "out float aDepth;\n"
  26 "\n"
  27 "void main()\n"
  28 "{\n"
  29 "   vec3 world_pos = uMdl * vec4( a_co, 1.0 );\n"
  30 "   gl_Position = uPv * vec4(world_pos,1.0);\n"
  31 "\n"
  32 "   vec2 depth_coords = (world_pos.xz-uDepthBounds.xy)*uDepthBounds.zw;\n"
  33 "   aUv = vec4(world_pos.xz*0.005,depth_coords);\n"
  34 "   aCo = world_pos;\n"
  35 "\n"
  36 "   aDepth = gl_Position.z;\n"
  37 "}\n"
  38 ""},
  39    .fs =
  40 {
  41 .orig_file = "../shaders/water.fs",
  42 .static_src =
  43 "vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue, \n"
  44 "      vec4 beneath, vec4 above )\n"
  45 "{\n"
  46 "   vec3 colour_shore = vec3( 0.21, 0.6, 0.8 );\n"
  47 "   vec3 colour_ocean = vec3( 0.01, 0.1, 0.2 );\n"
  48 "   vec3 surface_tint = mix(colour_shore, colour_ocean, depthvalue);\n"
  49 "\n"
  50 "   float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);\n"
  51 "\n"
  52 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
  53 "   vec3 specdir = reflect( -lightdir, vnorm );\n"
  54 "   float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;\n"
  55 "   \n"
  56 "   // Depth \n"
  57 "   float depthblend = pow( beneath.a,0.8 );\n"
  58 "\n"
  59 "   // Composite\n"
  60 "   vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );\n"
  61 "   //vsurface += spec;\n"
  62 "\n"
  63 "   return vec4( vsurface,depthblend );\n"
  64 "}\n"
  65 "\n"
  66 "#line      2        0 \n"
  67 "\n"
  68 "out vec4 FragColor;\n"
  69 "\n"
  70 "uniform sampler2D uTexMain;\n"
  71 "uniform sampler2D uTexDudv;\n"
  72 "uniform sampler2D uTexDepth;\n"
  73 "uniform sampler2D uTexBack;\n"
  74 "\n"
  75 "uniform vec2 uInvRes;\n"
  76 "uniform float uTime;\n"
  77 "\n"
  78 "uniform vec3 uCamera;\n"
  79 "uniform float uSurfaceY;\n"
  80 "\n"
  81 "in vec4 aUv;\n"
  82 "in vec3 aCo;\n"
  83 "in float aDepth;\n"
  84 "\n"
  85 "void main()\n"
  86 "{\n"
  87 "   // Create texture coords\n"
  88 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
  89 "   \n"
  90 "   // Surface colour composite\n"
  91 "   float depthvalue = texture( uTexDepth, aUv.zw ).r;\n"
  92 "\n"
  93 "   vec4 dudva = texture(uTexDudv, aUv.xy + vec2(uTime*0.008,uTime*0.006))-0.5;\n"
  94 "   vec4 dudvb = texture(uTexDudv, aUv.xy*7.0-vec2(uTime*0.003,uTime*0.03))-0.5;\n"
  95 "\n"
  96 "   vec3 surfnorm = dudva.rgb + dudvb.rgb;\n"
  97 "   surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);\n"
  98 "   \n"
  99 "   // Foam\n"
 100 "   float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );\n"
 101 "   fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);\n"
 102 "\n"
 103 "   // Lighting\n"
 104 "   vec3 halfview = -normalize( aCo-uCamera );\n"
 105 "\n"
 106 "   // Sample textures\n"
 107 "   vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );\n"
 108 "   vec4 beneath = texture( uTexBack, ssuv );\n"
 109 "\n"
 110 "   // Fog\n"
 111 "   //vec4 horizon = vec4( 0.5, 0.6, 0.9, 1.0 );\n"
 112 "   vec4 horizon = vec4( 0.7,0.8,0.88, 1.0 );\n"
 113 "   float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);\n"
 114 "\n"
 115 "   // Composite\n"
 116 "   vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );\n"
 117 "   vsurface.a -= fdist;\n"
 118 "   FragColor = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );\n"
 119 "}\n"
 120 ""},
 121 };
 122
 123 static GLuint _uniform_water_uPv;
 124 static GLuint _uniform_water_uMdl;
 125 static GLuint _uniform_water_uDepthBounds;
 126 static GLuint _uniform_water_uTexMain;
 127 static GLuint _uniform_water_uTexDudv;
 128 static GLuint _uniform_water_uTexDepth;
 129 static GLuint _uniform_water_uTexBack;
 130 static GLuint _uniform_water_uInvRes;
 131 static GLuint _uniform_water_uTime;
 132 static GLuint _uniform_water_uCamera;
 133 static GLuint _uniform_water_uSurfaceY;
 134 static void shader_water_uPv(m4x4f m){
 135    glUniformMatrix4fv( _uniform_water_uPv, 1, GL_FALSE, (float *)m );
 136 }
 137 static void shader_water_uMdl(m4x3f m){
 138    glUniformMatrix4x3fv( _uniform_water_uMdl, 1, GL_FALSE, (float *)m );
 139 }
 140 static void shader_water_uDepthBounds(v4f v){
 141    glUniform4fv( _uniform_water_uDepthBounds, 1, v );
 142 }
 143 static void shader_water_uTexMain(int i){
 144    glUniform1i( _uniform_water_uTexMain, i );
 145 }
 146 static void shader_water_uTexDudv(int i){
 147    glUniform1i( _uniform_water_uTexDudv, i );
 148 }
 149 static void shader_water_uTexDepth(int i){
 150    glUniform1i( _uniform_water_uTexDepth, i );
 151 }
 152 static void shader_water_uTexBack(int i){
 153    glUniform1i( _uniform_water_uTexBack, i );
 154 }
 155 static void shader_water_uInvRes(v2f v){
 156    glUniform2fv( _uniform_water_uInvRes, 1, v );
 157 }
 158 static void shader_water_uTime(float f){
 159    glUniform1f( _uniform_water_uTime, f );
 160 }
 161 static void shader_water_uCamera(v3f v){
 162    glUniform3fv( _uniform_water_uCamera, 1, v );
 163 }
 164 static void shader_water_uSurfaceY(float f){
 165    glUniform1f( _uniform_water_uSurfaceY, f );
 166 }
 167 static void shader_water_register(void){
 168    vg_shader_register( &_shader_water );
 169 }
 170 static void shader_water_use(void){ glUseProgram(_shader_water.id); }
 171 static void shader_water_link(void){
 172    _uniform_water_uPv = glGetUniformLocation( _shader_water.id, "uPv" );
 173    _uniform_water_uMdl = glGetUniformLocation( _shader_water.id, "uMdl" );
 174    _uniform_water_uDepthBounds = glGetUniformLocation( _shader_water.id, "uDepthBounds" );
 175    _uniform_water_uTexMain = glGetUniformLocation( _shader_water.id, "uTexMain" );
 176    _uniform_water_uTexDudv = glGetUniformLocation( _shader_water.id, "uTexDudv" );
 177    _uniform_water_uTexDepth = glGetUniformLocation( _shader_water.id, "uTexDepth" );
 178    _uniform_water_uTexBack = glGetUniformLocation( _shader_water.id, "uTexBack" );
 179    _uniform_water_uInvRes = glGetUniformLocation( _shader_water.id, "uInvRes" );
 180    _uniform_water_uTime = glGetUniformLocation( _shader_water.id, "uTime" );
 181    _uniform_water_uCamera = glGetUniformLocation( _shader_water.id, "uCamera" );
 182    _uniform_water_uSurfaceY = glGetUniformLocation( _shader_water.id, "uSurfaceY" );
 183 }
 184 #endif /* SHADER_water_H */