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/standard.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/water.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform sampler2D uTexMain;\n"
  43 "uniform sampler2D uTexDudv;\n"
  44 "uniform sampler2D uTexBack;\n"
  45 "\n"
  46 "uniform vec2 uInvRes;\n"
  47 "uniform float uTime;\n"
  48 "uniform vec3 uCamera;\n"
  49 "uniform float uSurfaceY;\n"
  50 "\n"
  51 "in vec4 aColour;\n"
  52 "in vec2 aUv;\n"
  53 "in vec3 aNorm;\n"
  54 "in vec3 aCo;\n"
  55 "\n"
  56 "#line       1        1 \n"
  57 "layout (std140) uniform ub_world_lighting\n"
  58 "{\n"
  59 "   vec3 g_directional;\n"
  60 "   vec3 g_sun_colour;\n"
  61 "   vec3 g_shadow_colour;\n"
  62 "   vec4 g_water_plane;\n"
  63 "   vec4 g_depth_bounds;\n"
  64 "   float g_water_fog;\n"
  65 "};\n"
  66 "\n"
  67 "uniform sampler2D g_world_depth;\n"
  68 "\n"
  69 "// Standard diffuse + spec models\n"
  70 "// ==============================\n"
  71 "\n"
  72 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  73 "{\n"
  74 "   float flight = dot( g_directional, wnormal )*0.5+0.5;\n"
  75 "   return vfrag * mix( g_shadow_colour, g_sun_colour, flight );\n"
  76 "}\n"
  77 "\n"
  78 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  79 "{\n"
  80 "   vec3 specdir = reflect( -g_directional, wnormal );\n"
  81 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  82 "   return vfrag + g_sun_colour*spec*fintensity;\n"
  83 "}\n"
  84 "\n"
  85 "float world_depth_sample( vec3 pos )\n"
  86 "{\n"
  87 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
  88 "   return texture( g_world_depth, depth_coord ).r;\n"
  89 "}\n"
  90 "\n"
  91 "float shadow_sample( vec3 vdir )\n"
  92 "{\n"
  93 "   vec3 sample_pos = aCo + vdir;\n"
  94 "   float height_sample = world_depth_sample( sample_pos );\n"
  95 "\n"
  96 "   float fdelta = height_sample - sample_pos.y;\n"
  97 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
  98 "}\n"
  99 "\n"
 100 "vec3 do_light_shadowing( vec3 vfrag )\n"
 101 "{\n"
 102 "   float faccum = 0.0;\n"
 103 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 104 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 105 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 106 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 107 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 108 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 109 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 110 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 111 "   return mix( vfrag, g_shadow_colour, faccum );\n"
 112 "}\n"
 113 "\n"
 114 "\n"
 115 "#line     18        0 \n"
 116 "\n"
 117 "vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue, \n"
 118 "      vec4 beneath, vec4 above )\n"
 119 "{\n"
 120 "   vec3 colour_shore = vec3( 0.21, 0.6, 0.8 );\n"
 121 "   vec3 colour_ocean = vec3( 0.01, 0.1, 0.2 );\n"
 122 "   vec3 surface_tint = mix(colour_shore, colour_ocean, depthvalue);\n"
 123 "\n"
 124 "   float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);\n"
 125 "\n"
 126 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
 127 "   vec3 specdir = reflect( -lightdir, vnorm );\n"
 128 "   float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;\n"
 129 "   \n"
 130 "   // Depth \n"
 131 "   float depthblend = pow( beneath.a,0.8 );\n"
 132 "\n"
 133 "   // Composite\n"
 134 "   vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );\n"
 135 "   //vsurface += spec;\n"
 136 "\n"
 137 "   return vec4( vsurface,depthblend );\n"
 138 "}\n"
 139 "\n"
 140 "void main()\n"
 141 "{\n"
 142 "   // Create texture coords\n"
 143 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
 144 "   \n"
 145 "   // Surface colour composite\n"
 146 "   float depthvalue = clamp( -world_depth_sample( aCo )*(1.0/25.0), 0.0, 1.0 );\n"
 147 "\n"
 148 "   vec2 world_coord = aCo.xz * 0.008;\n"
 149 "   vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );\n"
 150 "   vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;\n"
 151 "   vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;\n"
 152 "\n"
 153 "   vec3 surfnorm = dudva.rgb + dudvb.rgb;\n"
 154 "   surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);\n"
 155 "   \n"
 156 "   // Foam\n"
 157 "   float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );\n"
 158 "   fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);\n"
 159 "\n"
 160 "   // Lighting\n"
 161 "   vec3 halfview = -normalize( aCo-uCamera );\n"
 162 "\n"
 163 "   // Sample textures\n"
 164 "   vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );\n"
 165 "   vec4 beneath = texture( uTexBack, ssuv );\n"
 166 "\n"
 167 "   // Fog\n"
 168 "   float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);\n"
 169 "\n"
 170 "   // Composite\n"
 171 "   vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );\n"
 172 "   vsurface.a -= fdist;\n"
 173 "   FragColor = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );\n"
 174 "}\n"
 175 ""},
 176 };
 177
 178 static GLuint _uniform_water_uPv;
 179 static GLuint _uniform_water_uMdl;
 180 static GLuint _uniform_water_uTexMain;
 181 static GLuint _uniform_water_uTexDudv;
 182 static GLuint _uniform_water_uTexBack;
 183 static GLuint _uniform_water_uInvRes;
 184 static GLuint _uniform_water_uTime;
 185 static GLuint _uniform_water_uCamera;
 186 static GLuint _uniform_water_uSurfaceY;
 187 static GLuint _uniform_water_g_world_depth;
 188 static void shader_water_uPv(m4x4f m){
 189    glUniformMatrix4fv( _uniform_water_uPv, 1, GL_FALSE, (float *)m );
 190 }
 191 static void shader_water_uMdl(m4x3f m){
 192    glUniformMatrix4x3fv( _uniform_water_uMdl, 1, GL_FALSE, (float *)m );
 193 }
 194 static void shader_water_uTexMain(int i){
 195    glUniform1i( _uniform_water_uTexMain, i );
 196 }
 197 static void shader_water_uTexDudv(int i){
 198    glUniform1i( _uniform_water_uTexDudv, i );
 199 }
 200 static void shader_water_uTexBack(int i){
 201    glUniform1i( _uniform_water_uTexBack, i );
 202 }
 203 static void shader_water_uInvRes(v2f v){
 204    glUniform2fv( _uniform_water_uInvRes, 1, v );
 205 }
 206 static void shader_water_uTime(float f){
 207    glUniform1f( _uniform_water_uTime, f );
 208 }
 209 static void shader_water_uCamera(v3f v){
 210    glUniform3fv( _uniform_water_uCamera, 1, v );
 211 }
 212 static void shader_water_uSurfaceY(float f){
 213    glUniform1f( _uniform_water_uSurfaceY, f );
 214 }
 215 static void shader_water_g_world_depth(int i){
 216    glUniform1i( _uniform_water_g_world_depth, i );
 217 }
 218 static void shader_water_register(void){
 219    vg_shader_register( &_shader_water );
 220 }
 221 static void shader_water_use(void){ glUseProgram(_shader_water.id); }
 222 static void shader_water_link(void){
 223    _uniform_water_uPv = glGetUniformLocation( _shader_water.id, "uPv" );
 224    _uniform_water_uMdl = glGetUniformLocation( _shader_water.id, "uMdl" );
 225    _uniform_water_uTexMain = glGetUniformLocation( _shader_water.id, "uTexMain" );
 226    _uniform_water_uTexDudv = glGetUniformLocation( _shader_water.id, "uTexDudv" );
 227    _uniform_water_uTexBack = glGetUniformLocation( _shader_water.id, "uTexBack" );
 228    _uniform_water_uInvRes = glGetUniformLocation( _shader_water.id, "uInvRes" );
 229    _uniform_water_uTime = glGetUniformLocation( _shader_water.id, "uTime" );
 230    _uniform_water_uCamera = glGetUniformLocation( _shader_water.id, "uCamera" );
 231    _uniform_water_uSurfaceY = glGetUniformLocation( _shader_water.id, "uSurfaceY" );
 232    _uniform_water_g_world_depth = glGetUniformLocation( _shader_water.id, "g_world_depth" );
 233 }
 234 #endif /* SHADER_water_H */