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 "   vec4 g_light_colours[3];\n"
  60 "   vec4 g_light_directions[3];\n"
  61 "   vec4 g_ambient_colour;\n"
  62 "\n"
  63 "   vec4 g_water_plane;\n"
  64 "   vec4 g_depth_bounds;\n"
  65 "   float g_water_fog;\n"
  66 "   int g_light_count;\n"
  67 "   int g_light_preview;\n"
  68 "};\n"
  69 "\n"
  70 "uniform sampler2D g_world_depth;\n"
  71 "\n"
  72 "// Standard diffuse + spec models\n"
  73 "// ==============================\n"
  74 "\n"
  75 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  76 "{\n"
  77 "   vec3 vtotal = g_ambient_colour.rgb;\n"
  78 "\n"
  79 "   for( int i=0; i<g_light_count; i++ )\n"
  80 "   {\n"
  81 "      vec3 vcolour = g_light_colours[i].rgb;\n"
  82 "      vec3 vdir = g_light_directions[i].xyz;\n"
  83 "\n"
  84 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
  85 "      vtotal += vcolour*flight;\n"
  86 "   }\n"
  87 "\n"
  88 "   return vfrag * vtotal;\n"
  89 "}\n"
  90 "\n"
  91 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  92 "{\n"
  93 "   vec3 vcolour = g_light_colours[0].rgb;\n"
  94 "   vec3 vdir = g_light_directions[0].xyz;\n"
  95 "\n"
  96 "   vec3 specdir = reflect( -vdir, wnormal );\n"
  97 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  98 "   return vfrag + vcolour*spec*fintensity;\n"
  99 "}\n"
 100 "\n"
 101 "float world_depth_sample( vec3 pos )\n"
 102 "{\n"
 103 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 104 "   return texture( g_world_depth, depth_coord ).r;\n"
 105 "}\n"
 106 "\n"
 107 "float shadow_sample( vec3 vdir )\n"
 108 "{\n"
 109 "   vec3 sample_pos = aCo + vdir;\n"
 110 "   float height_sample = world_depth_sample( sample_pos );\n"
 111 "\n"
 112 "   float fdelta = height_sample - sample_pos.y;\n"
 113 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 114 "}\n"
 115 "\n"
 116 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 117 "{\n"
 118 "   float faccum = 0.0;\n"
 119 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 120 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 121 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 122 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 123 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 124 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 125 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 126 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 127 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 128 "}\n"
 129 "\n"
 130 "vec3 do_light_shadowing( vec3 vfrag )\n"
 131 "{\n"
 132 "   float fspread = g_light_colours[0].w;\n"
 133 "   vec3  vdir = g_light_directions[0].xyz;\n"
 134 "   float flength = g_light_directions[0].w;\n"
 135 "\n"
 136 "   float famt = 0.0;\n"
 137 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 138 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 139 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 140 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 141 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 142 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 143 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 144 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 145 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 146 "}\n"
 147 "\n"
 148 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 149 "{\n"
 150 "   float dist = pow(fdist*0.0008,1.2);\n"
 151 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 152 "}\n"
 153 "\n"
 154 "#line     18        0 \n"
 155 "\n"
 156 "vec4 water_surf( vec3 halfview, vec3 vnorm, float depthvalue, \n"
 157 "      vec4 beneath, vec4 above )\n"
 158 "{\n"
 159 "   vec3 colour_shore = vec3( 0.21, 0.6, 0.8 );\n"
 160 "   vec3 colour_ocean = vec3( 0.01, 0.1, 0.2 );\n"
 161 "   vec3 surface_tint = mix(colour_shore, colour_ocean, depthvalue);\n"
 162 "\n"
 163 "   float ffresnel = pow(1.0-dot( vnorm, halfview ),5.0);\n"
 164 "\n"
 165 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
 166 "   vec3 specdir = reflect( -lightdir, vnorm );\n"
 167 "   float spec = pow(max(dot(halfview,specdir),0.0),20.0)*0.3;\n"
 168 "   \n"
 169 "   // Depth \n"
 170 "   float depthblend = pow( beneath.a,0.8 );\n"
 171 "\n"
 172 "   // Composite\n"
 173 "   vec3 vsurface = mix(surface_tint, above.rgb, ffresnel );\n"
 174 "   //vsurface += spec;\n"
 175 "\n"
 176 "   return vec4( vsurface,depthblend );\n"
 177 "}\n"
 178 "\n"
 179 "void main()\n"
 180 "{\n"
 181 "   // Create texture coords\n"
 182 "   vec2 ssuv = gl_FragCoord.xy*uInvRes;\n"
 183 "   \n"
 184 "   // Surface colour composite\n"
 185 "   float depthvalue = clamp( -world_depth_sample( aCo )*(1.0/25.0), 0.0, 1.0 );\n"
 186 "\n"
 187 "   vec2 world_coord = aCo.xz * 0.008;\n"
 188 "   vec4 time_offsets = vec4( uTime ) * vec4( 0.008, 0.006, 0.003, 0.03 );\n"
 189 "   vec4 dudva = texture( uTexDudv, world_coord + time_offsets.xy )-0.5;\n"
 190 "   vec4 dudvb = texture( uTexDudv, world_coord *7.0 - time_offsets.zw )-0.5;\n"
 191 "\n"
 192 "   vec3 surfnorm = dudva.rgb + dudvb.rgb;\n"
 193 "   surfnorm = normalize(vec3(0.0,1.0,0.0) + dudva.xyz*0.4 + dudvb.xyz*0.1);\n"
 194 "   \n"
 195 "   // Foam\n"
 196 "   float fband = fract( aCo.z*0.02+uTime*0.1+depthvalue*10.0 );\n"
 197 "   fband = step( fband+dudva.a*0.8, 0.3 ) * max((1.0-depthvalue*4.0),0.0);\n"
 198 "\n"
 199 "   // Lighting\n"
 200 "   vec3 halfview = -normalize( aCo-uCamera );\n"
 201 "\n"
 202 "   // Sample textures\n"
 203 "   vec4 above = texture( uTexMain, ssuv+ surfnorm.xz*0.2 );\n"
 204 "   vec4 beneath = texture( uTexBack, ssuv );\n"
 205 "\n"
 206 "   // Fog\n"
 207 "   float fdist = pow(length( aCo.xz-uCamera.xz ) * 0.00047, 2.6);\n"
 208 "\n"
 209 "   // Composite\n"
 210 "   vec4 vsurface = water_surf( halfview, surfnorm, depthvalue, beneath, above );\n"
 211 "   vsurface.a -= fdist;\n"
 212 "   FragColor = mix( vsurface, vec4(1.0,1.0,1.0,0.5), fband );\n"
 213 "}\n"
 214 ""},
 215 };
 216
 217 static GLuint _uniform_water_uPv;
 218 static GLuint _uniform_water_uMdl;
 219 static GLuint _uniform_water_uTexMain;
 220 static GLuint _uniform_water_uTexDudv;
 221 static GLuint _uniform_water_uTexBack;
 222 static GLuint _uniform_water_uInvRes;
 223 static GLuint _uniform_water_uTime;
 224 static GLuint _uniform_water_uCamera;
 225 static GLuint _uniform_water_uSurfaceY;
 226 static GLuint _uniform_water_g_world_depth;
 227 static void shader_water_uPv(m4x4f m){
 228    glUniformMatrix4fv( _uniform_water_uPv, 1, GL_FALSE, (float *)m );
 229 }
 230 static void shader_water_uMdl(m4x3f m){
 231    glUniformMatrix4x3fv( _uniform_water_uMdl, 1, GL_FALSE, (float *)m );
 232 }
 233 static void shader_water_uTexMain(int i){
 234    glUniform1i( _uniform_water_uTexMain, i );
 235 }
 236 static void shader_water_uTexDudv(int i){
 237    glUniform1i( _uniform_water_uTexDudv, i );
 238 }
 239 static void shader_water_uTexBack(int i){
 240    glUniform1i( _uniform_water_uTexBack, i );
 241 }
 242 static void shader_water_uInvRes(v2f v){
 243    glUniform2fv( _uniform_water_uInvRes, 1, v );
 244 }
 245 static void shader_water_uTime(float f){
 246    glUniform1f( _uniform_water_uTime, f );
 247 }
 248 static void shader_water_uCamera(v3f v){
 249    glUniform3fv( _uniform_water_uCamera, 1, v );
 250 }
 251 static void shader_water_uSurfaceY(float f){
 252    glUniform1f( _uniform_water_uSurfaceY, f );
 253 }
 254 static void shader_water_g_world_depth(int i){
 255    glUniform1i( _uniform_water_g_world_depth, i );
 256 }
 257 static void shader_water_register(void){
 258    vg_shader_register( &_shader_water );
 259 }
 260 static void shader_water_use(void){ glUseProgram(_shader_water.id); }
 261 static void shader_water_link(void){
 262    _uniform_water_uPv = glGetUniformLocation( _shader_water.id, "uPv" );
 263    _uniform_water_uMdl = glGetUniformLocation( _shader_water.id, "uMdl" );
 264    _uniform_water_uTexMain = glGetUniformLocation( _shader_water.id, "uTexMain" );
 265    _uniform_water_uTexDudv = glGetUniformLocation( _shader_water.id, "uTexDudv" );
 266    _uniform_water_uTexBack = glGetUniformLocation( _shader_water.id, "uTexBack" );
 267    _uniform_water_uInvRes = glGetUniformLocation( _shader_water.id, "uInvRes" );
 268    _uniform_water_uTime = glGetUniformLocation( _shader_water.id, "uTime" );
 269    _uniform_water_uCamera = glGetUniformLocation( _shader_water.id, "uCamera" );
 270    _uniform_water_uSurfaceY = glGetUniformLocation( _shader_water.id, "uSurfaceY" );
 271    _uniform_water_g_world_depth = glGetUniformLocation( _shader_water.id, "g_world_depth" );
 272 }
 273 #endif /* SHADER_water_H */