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*0.01,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 "out vec4 FragColor;\n"
  44 "\n"
  45 "uniform sampler2D uTexMain;\n"
  46 "uniform sampler2D uTexDudv;\n"
  47 "uniform sampler2D uTexDepth;\n"
  48 "uniform sampler2D uTexBack;\n"
  49 "\n"
  50 "uniform vec2 uInvRes;\n"
  51 "uniform float uTime;\n"
  52 "\n"
  53 "uniform vec3 uCamera;\n"
  54 "uniform float uSurfaceY;\n"
  55 "\n"
  56 "in vec4 aUv;\n"
  57 "in vec3 aCo;\n"
  58 "in float aDepth;\n"
  59 "\n"
  60 "void main()\n"
  61 "{\n"
  62 "   // Reflected and warped texture\n"
  63 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
  64 "\n"
  65 "   vec4 dudva = texture( uTexDudv, aUv.xy - vec2(uTime*0.004f,uTime*0.003f) );\n"
  66 "   vec4 dudvb = texture( uTexDudv, aUv.xy*0.7 - vec2(uTime*0.01,uTime*0.0054) );\n"
  67 "   vec2 distortamt = (dudva.rg-0.5) * (dudvb.ba-0.5) * 0.6;\n"
  68 "\n"
  69 "   vec4 reflected = texture( uTexMain, ssuv+distortamt );\n"
  70 "   \n"
  71 "   // Surface colour composite\n"
  72 "   float depthvalue = texture( uTexDepth, aUv.zw ).r;\n"
  73 "\n"
  74 "   vec3 colour_shore = vec3( 0.21, 0.6, 0.8 );\n"
  75 "   vec3 colour_ocean = vec3( 0.01, 0.1, 0.2 );\n"
  76 "   vec3 surface_tint = mix(colour_shore, colour_ocean, pow(depthvalue,1.8))*1.5;\n"
  77 "   \n"
  78 "   // Foam\n"
  79 "   float fband = fract( aCo.z*0.1+uTime*0.1-depthvalue*10.0 );\n"
  80 "   fband = step( fband+dudvb.g*0.8, 0.5 ) * max((1.0-depthvalue*4.0),0.0);\n"
  81 "\n"
  82 "   // Lighting\n"
  83 "   vec3 surfnorm = vec3(distortamt.x,1.0,distortamt.y);\n"
  84 "   \n"
  85 "   vec3 halfview = -normalize( aCo-uCamera );\n"
  86 "   float ffresnel = pow(1.0-dot( surfnorm, halfview ),5.0);\n"
  87 "\n"
  88 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
  89 "   vec3 specdir = reflect( -lightdir, surfnorm );\n"
  90 "   float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;\n"
  91 "   \n"
  92 "   // Depth \n"
  93 "   vec4 backsample = texture( uTexBack, ssuv+distortamt*0.1 );\n"
  94 "   float depthblend = pow(backsample.a,0.8);\n"
  95 "\n"
  96 "   // Composite\n"
  97 "   vec3 vsurface = mix(surface_tint*backsample.rgb, reflected.rgb, ffresnel );\n"
  98 "   vsurface += spec;\n"
  99 "   \n"
 100 "   FragColor = mix( vec4(vsurface,depthblend), vec4(1.0,1.0,1.0,0.8), fband );\n"
 101 "}\n"
 102 ""},
 103 };
 104
 105 static GLuint _uniform_water_uPv;
 106 static GLuint _uniform_water_uMdl;
 107 static GLuint _uniform_water_uDepthBounds;
 108 static GLuint _uniform_water_uTexMain;
 109 static GLuint _uniform_water_uTexDudv;
 110 static GLuint _uniform_water_uTexDepth;
 111 static GLuint _uniform_water_uTexBack;
 112 static GLuint _uniform_water_uInvRes;
 113 static GLuint _uniform_water_uTime;
 114 static GLuint _uniform_water_uCamera;
 115 static GLuint _uniform_water_uSurfaceY;
 116 static void shader_water_uPv(m4x4f m){
 117    glUniformMatrix4fv( _uniform_water_uPv, 1, GL_FALSE, (float *)m );
 118 }
 119 static void shader_water_uMdl(m4x3f m){
 120    glUniformMatrix4x3fv( _uniform_water_uMdl, 1, GL_FALSE, (float *)m );
 121 }
 122 static void shader_water_uDepthBounds(v4f v){
 123    glUniform4fv( _uniform_water_uDepthBounds, 1, v );
 124 }
 125 static void shader_water_uTexMain(int i){
 126    glUniform1i( _uniform_water_uTexMain, i );
 127 }
 128 static void shader_water_uTexDudv(int i){
 129    glUniform1i( _uniform_water_uTexDudv, i );
 130 }
 131 static void shader_water_uTexDepth(int i){
 132    glUniform1i( _uniform_water_uTexDepth, i );
 133 }
 134 static void shader_water_uTexBack(int i){
 135    glUniform1i( _uniform_water_uTexBack, i );
 136 }
 137 static void shader_water_uInvRes(v2f v){
 138    glUniform2fv( _uniform_water_uInvRes, 1, v );
 139 }
 140 static void shader_water_uTime(float f){
 141    glUniform1f( _uniform_water_uTime, f );
 142 }
 143 static void shader_water_uCamera(v3f v){
 144    glUniform3fv( _uniform_water_uCamera, 1, v );
 145 }
 146 static void shader_water_uSurfaceY(float f){
 147    glUniform1f( _uniform_water_uSurfaceY, f );
 148 }
 149 static void shader_water_register(void){
 150    vg_shader_register( &_shader_water );
 151 }
 152 static void shader_water_use(void){ glUseProgram(_shader_water.id); }
 153 static void shader_water_link(void){
 154    _uniform_water_uPv = glGetUniformLocation( _shader_water.id, "uPv" );
 155    _uniform_water_uMdl = glGetUniformLocation( _shader_water.id, "uMdl" );
 156    _uniform_water_uDepthBounds = glGetUniformLocation( _shader_water.id, "uDepthBounds" );
 157    _uniform_water_uTexMain = glGetUniformLocation( _shader_water.id, "uTexMain" );
 158    _uniform_water_uTexDudv = glGetUniformLocation( _shader_water.id, "uTexDudv" );
 159    _uniform_water_uTexDepth = glGetUniformLocation( _shader_water.id, "uTexDepth" );
 160    _uniform_water_uTexBack = glGetUniformLocation( _shader_water.id, "uTexBack" );
 161    _uniform_water_uInvRes = glGetUniformLocation( _shader_water.id, "uInvRes" );
 162    _uniform_water_uTime = glGetUniformLocation( _shader_water.id, "uTime" );
 163    _uniform_water_uCamera = glGetUniformLocation( _shader_water.id, "uCamera" );
 164    _uniform_water_uSurfaceY = glGetUniformLocation( _shader_water.id, "uSurfaceY" );
 165 }
 166 #endif /* SHADER_water_H */