shaders/terrain.h

   1 #ifndef SHADER_terrain_H
   2 #define SHADER_terrain_H
   3 static void shader_terrain_link(void);
   4 static void shader_terrain_register(void);
   5 static struct vg_shader _shader_terrain = {
   6    .name = "terrain",
   7    .link = shader_terrain_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 "out vec3 aWorldCo;\n"
  27 "\n"
  28 "void main()\n"
  29 "{\n"
  30 "   vec3 world_pos = uMdl * vec4(a_co,1.0);\n"
  31 "   gl_Position = uPv * vec4( world_pos, 1.0 );\n"
  32 "   aColour = a_colour;\n"
  33 "   aUv = a_uv;\n"
  34 "   aNorm = mat3(uMdl) * a_norm;\n"
  35 "   aCo = a_co;\n"
  36 "   aWorldCo = world_pos;\n"
  37 "}\n"
  38 ""},
  39    .fs =
  40 {
  41 .orig_file = "../../shaders/terrain.fs",
  42 .static_src =
  43 "out vec4 FragColor;\n"
  44 "\n"
  45 "uniform sampler2D uTexGarbage;\n"
  46 "uniform sampler2D uTexGradients;\n"
  47 "uniform vec3 uCamera;\n"
  48 "\n"
  49 "in vec4 aColour;\n"
  50 "in vec2 aUv;\n"
  51 "in vec3 aNorm;\n"
  52 "in vec3 aCo;\n"
  53 "in vec3 aWorldCo;\n"
  54 "\n"
  55 "#line       1        1 \n"
  56 "layout (std140) uniform ub_world_lighting\n"
  57 "{\n"
  58 "   vec4 g_light_colours[3];\n"
  59 "   vec4 g_light_directions[3];\n"
  60 "   vec4 g_ambient_colour;\n"
  61 "\n"
  62 "   vec4 g_water_plane;\n"
  63 "   vec4 g_depth_bounds;\n"
  64 "   float g_water_fog;\n"
  65 "   int g_light_count;\n"
  66 "   int g_light_preview;\n"
  67 "};\n"
  68 "\n"
  69 "uniform sampler2D g_world_depth;\n"
  70 "\n"
  71 "// Standard diffuse + spec models\n"
  72 "// ==============================\n"
  73 "\n"
  74 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  75 "{\n"
  76 "   vec3 vtotal = g_ambient_colour.rgb;\n"
  77 "\n"
  78 "   for( int i=0; i<g_light_count; i++ )\n"
  79 "   {\n"
  80 "      vec3 vcolour = g_light_colours[i].rgb;\n"
  81 "      vec3 vdir = g_light_directions[i].xyz;\n"
  82 "\n"
  83 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
  84 "      vtotal += vcolour*flight;\n"
  85 "   }\n"
  86 "\n"
  87 "   return vfrag * vtotal;\n"
  88 "}\n"
  89 "\n"
  90 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  91 "{\n"
  92 "   vec3 vcolour = g_light_colours[0].rgb;\n"
  93 "   vec3 vdir = g_light_directions[0].xyz;\n"
  94 "\n"
  95 "   vec3 specdir = reflect( -vdir, wnormal );\n"
  96 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  97 "   return vfrag + vcolour*spec*fintensity;\n"
  98 "}\n"
  99 "\n"
 100 "float world_depth_sample( vec3 pos )\n"
 101 "{\n"
 102 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
 103 "   return texture( g_world_depth, depth_coord ).r;\n"
 104 "}\n"
 105 "\n"
 106 "float shadow_sample( vec3 vdir )\n"
 107 "{\n"
 108 "   vec3 sample_pos = aWorldCo + vdir;\n"
 109 "   float height_sample = world_depth_sample( sample_pos );\n"
 110 "\n"
 111 "   float fdelta = height_sample - sample_pos.y;\n"
 112 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 113 "}\n"
 114 "\n"
 115 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 116 "{\n"
 117 "   float faccum = 0.0;\n"
 118 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 119 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 120 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 121 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 122 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 123 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 124 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 125 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 126 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 127 "}\n"
 128 "\n"
 129 "vec3 do_light_shadowing( vec3 vfrag )\n"
 130 "{\n"
 131 "   float fspread = g_light_colours[0].w;\n"
 132 "   vec3  vdir = g_light_directions[0].xyz;\n"
 133 "   float flength = g_light_directions[0].w;\n"
 134 "\n"
 135 "   float famt = 0.0;\n"
 136 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 137 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 138 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 139 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 140 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 141 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 142 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 143 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 144 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 145 "}\n"
 146 "\n"
 147 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 148 "{\n"
 149 "   float dist = pow(fdist*0.0008,1.2);\n"
 150 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 151 "}\n"
 152 "\n"
 153 "#line     14        0 \n"
 154 "\n"
 155 "void main()\n"
 156 "{\n"
 157 "   vec3 vfrag = vec3(0.5,0.5,0.5);\n"
 158 "\n"
 159 "   // ws modulation\n"
 160 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
 161 "   \n"
 162 "   // Creating normal patches\n"
 163 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
 164 "   vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);\n"
 165 "   vec2 dir = normalize(qnorm.xz);\n"
 166 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
 167 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
 168 "   \n"
 169 "   // Patch local noise\n"
 170 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
 171 "\n"
 172 "   // Colour blending\n"
 173 "   float amtgrass = step(qnorm.y,0.6);\n"
 174 "   float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);\n"
 175 "   vec2 uvgradients = aUv + vec2( amtgrass*0.5 + rgarbage.a*0.4, 0.0 );\n"
 176 "   vfrag = texture( uTexGradients, uvgradients ).rgb;\n"
 177 "   vfrag = mix( vfrag, vec3(1.0,0.9,0.8)*0.9, amtsand );\n"
 178 "\n"
 179 "   qnorm = mix( qnorm, aNorm, amtsand );\n"
 180 "   \n"
 181 "   if( g_light_preview == 1 )\n"
 182 "   {\n"
 183 "      vfrag = vec3(0.5);\n"
 184 "   }\n"
 185 "\n"
 186 "   // Lighting\n"
 187 "   vec3 halfview = uCamera - aCo;\n"
 188 "   float fdist = length( halfview );\n"
 189 "   halfview /= fdist;\n"
 190 "\n"
 191 "   vfrag = do_light_diffuse( vfrag, qnorm );\n"
 192 "   vfrag = do_light_spec( vfrag, qnorm, halfview, 0.1 );\n"
 193 "   vfrag = do_light_shadowing( vfrag );\n"
 194 "   vfrag = apply_fog( vfrag, fdist );\n"
 195 "\n"
 196 "   FragColor = vec4(vfrag, 1.0 );\n"
 197 "}\n"
 198 ""},
 199 };
 200
 201 static GLuint _uniform_terrain_uPv;
 202 static GLuint _uniform_terrain_uMdl;
 203 static GLuint _uniform_terrain_uTexGarbage;
 204 static GLuint _uniform_terrain_uTexGradients;
 205 static GLuint _uniform_terrain_uCamera;
 206 static GLuint _uniform_terrain_g_world_depth;
 207 static void shader_terrain_uPv(m4x4f m){
 208    glUniformMatrix4fv( _uniform_terrain_uPv, 1, GL_FALSE, (float *)m );
 209 }
 210 static void shader_terrain_uMdl(m4x3f m){
 211    glUniformMatrix4x3fv( _uniform_terrain_uMdl, 1, GL_FALSE, (float *)m );
 212 }
 213 static void shader_terrain_uTexGarbage(int i){
 214    glUniform1i( _uniform_terrain_uTexGarbage, i );
 215 }
 216 static void shader_terrain_uTexGradients(int i){
 217    glUniform1i( _uniform_terrain_uTexGradients, i );
 218 }
 219 static void shader_terrain_uCamera(v3f v){
 220    glUniform3fv( _uniform_terrain_uCamera, 1, v );
 221 }
 222 static void shader_terrain_g_world_depth(int i){
 223    glUniform1i( _uniform_terrain_g_world_depth, i );
 224 }
 225 static void shader_terrain_register(void){
 226    vg_shader_register( &_shader_terrain );
 227 }
 228 static void shader_terrain_use(void){ glUseProgram(_shader_terrain.id); }
 229 static void shader_terrain_link(void){
 230    _uniform_terrain_uPv = glGetUniformLocation( _shader_terrain.id, "uPv" );
 231    _uniform_terrain_uMdl = glGetUniformLocation( _shader_terrain.id, "uMdl" );
 232    _uniform_terrain_uTexGarbage = glGetUniformLocation( _shader_terrain.id, "uTexGarbage" );
 233    _uniform_terrain_uTexGradients = glGetUniformLocation( _shader_terrain.id, "uTexGradients" );
 234    _uniform_terrain_uCamera = glGetUniformLocation( _shader_terrain.id, "uCamera" );
 235    _uniform_terrain_g_world_depth = glGetUniformLocation( _shader_terrain.id, "g_world_depth" );
 236 }
 237 #endif /* SHADER_terrain_H */