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 "\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/terrain.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform sampler2D uTexGarbage;\n"
  43 "uniform sampler2D uTexGradients;\n"
  44 "uniform vec3 uCamera;\n"
  45 "\n"
  46 "in vec4 aColour;\n"
  47 "in vec2 aUv;\n"
  48 "in vec3 aNorm;\n"
  49 "in vec3 aCo;\n"
  50 "\n"
  51 "#line       1        1 \n"
  52 "layout (std140) uniform ub_world_lighting\n"
  53 "{\n"
  54 "   vec4 g_light_colours[3];\n"
  55 "   vec4 g_light_directions[3];\n"
  56 "   vec4 g_ambient_colour;\n"
  57 "\n"
  58 "   vec4 g_water_plane;\n"
  59 "   vec4 g_depth_bounds;\n"
  60 "   float g_water_fog;\n"
  61 "   int g_light_count;\n"
  62 "   int g_light_preview;\n"
  63 "};\n"
  64 "\n"
  65 "uniform sampler2D g_world_depth;\n"
  66 "\n"
  67 "// Standard diffuse + spec models\n"
  68 "// ==============================\n"
  69 "\n"
  70 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  71 "{\n"
  72 "   vec3 vtotal = g_ambient_colour.rgb;\n"
  73 "\n"
  74 "   for( int i=0; i<g_light_count; i++ )\n"
  75 "   {\n"
  76 "      vec3 vcolour = g_light_colours[i].rgb;\n"
  77 "      vec3 vdir = g_light_directions[i].xyz;\n"
  78 "\n"
  79 "      float flight = max(dot( vdir, wnormal )*0.75+0.25,0.0);\n"
  80 "      vtotal += vcolour*flight;\n"
  81 "   }\n"
  82 "\n"
  83 "   return vfrag * vtotal;\n"
  84 "}\n"
  85 "\n"
  86 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  87 "{\n"
  88 "   vec3 vcolour = g_light_colours[0].rgb;\n"
  89 "   vec3 vdir = g_light_directions[0].xyz;\n"
  90 "\n"
  91 "   vec3 specdir = reflect( -vdir, wnormal );\n"
  92 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  93 "   return vfrag + vcolour*spec*fintensity;\n"
  94 "}\n"
  95 "\n"
  96 "float world_depth_sample( vec3 pos )\n"
  97 "{\n"
  98 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
  99 "   return texture( g_world_depth, depth_coord ).r;\n"
 100 "}\n"
 101 "\n"
 102 "float shadow_sample( vec3 vdir )\n"
 103 "{\n"
 104 "   vec3 sample_pos = aCo + vdir;\n"
 105 "   float height_sample = world_depth_sample( sample_pos );\n"
 106 "\n"
 107 "   float fdelta = height_sample - sample_pos.y;\n"
 108 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
 109 "}\n"
 110 "\n"
 111 "vec3 do_light_shadowing_old( vec3 vfrag )\n"
 112 "{\n"
 113 "   float faccum = 0.0;\n"
 114 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
 115 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 116 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 117 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 118 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 119 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 120 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 121 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 122 "   return mix( vfrag, g_ambient_colour.rgb, faccum );\n"
 123 "}\n"
 124 "\n"
 125 "vec3 do_light_shadowing( vec3 vfrag )\n"
 126 "{\n"
 127 "   float fspread = g_light_colours[0].w;\n"
 128 "   vec3  vdir = g_light_directions[0].xyz;\n"
 129 "   float flength = g_light_directions[0].w;\n"
 130 "\n"
 131 "   float famt = 0.0;\n"
 132 "   famt+=shadow_sample((vdir+vec3(-0.563, 0.550, 0.307)*fspread)*flength*0.1);\n"
 133 "   famt+=shadow_sample((vdir+vec3( 0.808, 0.686, 0.346)*fspread)*flength*0.2);\n"
 134 "   famt+=shadow_sample((vdir+vec3( 0.787, 0.074,-0.065)*fspread)*flength*0.3);\n"
 135 "   famt+=shadow_sample((vdir+vec3(-0.593, 0.071,-0.425)*fspread)*flength*0.4);\n"
 136 "   famt+=shadow_sample((vdir+vec3(-0.790,-0.933,-0.875)*fspread)*flength*0.5);\n"
 137 "   famt+=shadow_sample((vdir+vec3( 0.807,-0.690, 0.472)*fspread)*flength*0.6);\n"
 138 "   famt+=shadow_sample((vdir+vec3( 0.522,-0.379, 0.350)*fspread)*flength*0.7);\n"
 139 "   famt+=shadow_sample((vdir+vec3( 0.483, 0.201, 0.306)*fspread)*flength*0.8);\n"
 140 "   return mix( vfrag, g_ambient_colour.rgb, famt );\n"
 141 "}\n"
 142 "\n"
 143 "vec3 apply_fog( vec3 vfrag, float fdist )\n"
 144 "{\n"
 145 "   float dist = pow(fdist*0.0008,1.2);\n"
 146 "   return mix( vfrag, vec3(0.55,0.76,1.0), min( 1.0, dist ) );\n"
 147 "}\n"
 148 "\n"
 149 "#line     13        0 \n"
 150 "\n"
 151 "void main()\n"
 152 "{\n"
 153 "   vec3 vfrag = vec3(0.5,0.5,0.5);\n"
 154 "\n"
 155 "   // ws modulation\n"
 156 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
 157 "   \n"
 158 "   // Creating normal patches\n"
 159 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
 160 "   vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);\n"
 161 "   vec2 dir = normalize(qnorm.xz);\n"
 162 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
 163 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
 164 "   \n"
 165 "   // Patch local noise\n"
 166 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
 167 "\n"
 168 "   // Colour blending\n"
 169 "   float amtgrass = step(qnorm.y,0.6);\n"
 170 "   float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);\n"
 171 "   vec2 uvgradients = aUv + vec2( amtgrass*0.5 + rgarbage.a*0.4, 0.0 );\n"
 172 "   vfrag = texture( uTexGradients, uvgradients ).rgb;\n"
 173 "   vfrag = mix( vfrag, vec3(1.0,0.9,0.8)*0.9, amtsand );\n"
 174 "\n"
 175 "   qnorm = mix( qnorm, aNorm, amtsand );\n"
 176 "   \n"
 177 "   if( g_light_preview == 1 )\n"
 178 "   {\n"
 179 "      vfrag = vec3(0.5);\n"
 180 "   }\n"
 181 "\n"
 182 "   // Lighting\n"
 183 "   vec3 halfview = uCamera - aCo;\n"
 184 "   float fdist = length( halfview );\n"
 185 "   halfview /= fdist;\n"
 186 "\n"
 187 "   vfrag = do_light_diffuse( vfrag, qnorm );\n"
 188 "   vfrag = do_light_spec( vfrag, qnorm, halfview, 0.1 );\n"
 189 "   vfrag = do_light_shadowing( vfrag );\n"
 190 "   vfrag = apply_fog( vfrag, fdist );\n"
 191 "\n"
 192 "   FragColor = vec4(vfrag, 1.0 );\n"
 193 "}\n"
 194 ""},
 195 };
 196
 197 static GLuint _uniform_terrain_uPv;
 198 static GLuint _uniform_terrain_uMdl;
 199 static GLuint _uniform_terrain_uTexGarbage;
 200 static GLuint _uniform_terrain_uTexGradients;
 201 static GLuint _uniform_terrain_uCamera;
 202 static GLuint _uniform_terrain_g_world_depth;
 203 static void shader_terrain_uPv(m4x4f m){
 204    glUniformMatrix4fv( _uniform_terrain_uPv, 1, GL_FALSE, (float *)m );
 205 }
 206 static void shader_terrain_uMdl(m4x3f m){
 207    glUniformMatrix4x3fv( _uniform_terrain_uMdl, 1, GL_FALSE, (float *)m );
 208 }
 209 static void shader_terrain_uTexGarbage(int i){
 210    glUniform1i( _uniform_terrain_uTexGarbage, i );
 211 }
 212 static void shader_terrain_uTexGradients(int i){
 213    glUniform1i( _uniform_terrain_uTexGradients, i );
 214 }
 215 static void shader_terrain_uCamera(v3f v){
 216    glUniform3fv( _uniform_terrain_uCamera, 1, v );
 217 }
 218 static void shader_terrain_g_world_depth(int i){
 219    glUniform1i( _uniform_terrain_g_world_depth, i );
 220 }
 221 static void shader_terrain_register(void){
 222    vg_shader_register( &_shader_terrain );
 223 }
 224 static void shader_terrain_use(void){ glUseProgram(_shader_terrain.id); }
 225 static void shader_terrain_link(void){
 226    _uniform_terrain_uPv = glGetUniformLocation( _shader_terrain.id, "uPv" );
 227    _uniform_terrain_uMdl = glGetUniformLocation( _shader_terrain.id, "uMdl" );
 228    _uniform_terrain_uTexGarbage = glGetUniformLocation( _shader_terrain.id, "uTexGarbage" );
 229    _uniform_terrain_uTexGradients = glGetUniformLocation( _shader_terrain.id, "uTexGradients" );
 230    _uniform_terrain_uCamera = glGetUniformLocation( _shader_terrain.id, "uCamera" );
 231    _uniform_terrain_g_world_depth = glGetUniformLocation( _shader_terrain.id, "g_world_depth" );
 232 }
 233 #endif /* SHADER_terrain_H */