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/terrain.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 "   vec3 g_directional;\n"
  55 "   vec3 g_sun_colour;\n"
  56 "   vec3 g_shadow_colour;\n"
  57 "   vec4 g_water_plane;\n"
  58 "   vec4 g_depth_bounds;\n"
  59 "   float g_water_fog;\n"
  60 "};\n"
  61 "\n"
  62 "uniform sampler2D g_world_depth;\n"
  63 "\n"
  64 "// Standard diffuse + spec models\n"
  65 "// ==============================\n"
  66 "\n"
  67 "vec3 do_light_diffuse( vec3 vfrag, vec3 wnormal )\n"
  68 "{\n"
  69 "   float flight = dot( g_directional, wnormal )*0.5+0.5;\n"
  70 "   return vfrag * mix( g_shadow_colour, g_sun_colour, flight );\n"
  71 "}\n"
  72 "\n"
  73 "vec3 do_light_spec( vec3 vfrag, vec3 wnormal, vec3 halfview, float fintensity )\n"
  74 "{\n"
  75 "   vec3 specdir = reflect( -g_directional, wnormal );\n"
  76 "   float spec = pow(max(dot( halfview, specdir ), 0.0), 10.0);\n"
  77 "   return vfrag + g_sun_colour*spec*fintensity;\n"
  78 "}\n"
  79 "\n"
  80 "float world_depth_sample( vec3 pos )\n"
  81 "{\n"
  82 "   vec2 depth_coord = (pos.xz - g_depth_bounds.xy) * g_depth_bounds.zw; \n"
  83 "   return texture( g_world_depth, depth_coord ).r;\n"
  84 "}\n"
  85 "\n"
  86 "float shadow_sample( vec3 vdir )\n"
  87 "{\n"
  88 "   vec3 sample_pos = aCo + vdir;\n"
  89 "   float height_sample = world_depth_sample( sample_pos );\n"
  90 "\n"
  91 "   float fdelta = height_sample - sample_pos.y;\n"
  92 "   return clamp( fdelta, 0.1, 0.2 )-0.1;\n"
  93 "}\n"
  94 "\n"
  95 "vec3 do_light_shadowing( vec3 vfrag )\n"
  96 "{\n"
  97 "   float faccum = 0.0;\n"
  98 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 ));\n"
  99 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 ));\n"
 100 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 ));\n"
 101 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 ));\n"
 102 "   faccum += shadow_sample( vec3( 0.0, 0.5, 0.0 )*1.5);\n"
 103 "   faccum += shadow_sample( vec3( 2.0, 0.3, 0.0 )*1.5);\n"
 104 "   faccum += shadow_sample( vec3( 3.0, 1.0, 0.0 )*1.5);\n"
 105 "   faccum += shadow_sample( vec3( 5.0, 1.0, 0.0 )*1.5);\n"
 106 "   return mix( vfrag, g_shadow_colour, faccum );\n"
 107 "}\n"
 108 "\n"
 109 "\n"
 110 "#line     13        0 \n"
 111 "\n"
 112 "void main()\n"
 113 "{\n"
 114 "   vec3 vfrag = vec3(0.5,0.5,0.5);\n"
 115 "\n"
 116 "   // ws modulation\n"
 117 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
 118 "   \n"
 119 "   // Creating normal patches\n"
 120 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
 121 "   vec3 qnorm = normalize(floor(aNorm*4.0+modnorm)*0.25) + vec3(0.001,0.0,0.0);\n"
 122 "   vec2 dir = normalize(qnorm.xz);\n"
 123 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
 124 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
 125 "   \n"
 126 "   // Patch local noise\n"
 127 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
 128 "\n"
 129 "   // Colour blending\n"
 130 "   float amtgrass = step(qnorm.y,0.6);\n"
 131 "   float amtsand = min(max((aCo.y - 10.0) * -0.1,0.0)*qnorm.y,1.0);\n"
 132 "   vec2 uvgradients = aUv + vec2( amtgrass*0.5 + rgarbage.a*0.4, 0.0 );\n"
 133 "   vfrag = texture( uTexGradients, uvgradients ).rgb;\n"
 134 "   vfrag = mix( vfrag, vec3(1.0,0.9,0.8), amtsand );\n"
 135 "\n"
 136 "   // Lighting\n"
 137 "   vec3 halfview = normalize( uCamera - aCo );\n"
 138 "   vfrag = do_light_diffuse( vfrag, qnorm );\n"
 139 "   vfrag = do_light_spec( vfrag, qnorm, halfview, 0.2 * rgarbage.a );\n"
 140 "   vfrag = do_light_shadowing( vfrag );\n"
 141 "\n"
 142 "   FragColor = vec4( vfrag, 1.0 );\n"
 143 "}\n"
 144 ""},
 145 };
 146
 147 static GLuint _uniform_terrain_uPv;
 148 static GLuint _uniform_terrain_uMdl;
 149 static GLuint _uniform_terrain_uTexGarbage;
 150 static GLuint _uniform_terrain_uTexGradients;
 151 static GLuint _uniform_terrain_uCamera;
 152 static GLuint _uniform_terrain_g_world_depth;
 153 static void shader_terrain_uPv(m4x4f m){
 154    glUniformMatrix4fv( _uniform_terrain_uPv, 1, GL_FALSE, (float *)m );
 155 }
 156 static void shader_terrain_uMdl(m4x3f m){
 157    glUniformMatrix4x3fv( _uniform_terrain_uMdl, 1, GL_FALSE, (float *)m );
 158 }
 159 static void shader_terrain_uTexGarbage(int i){
 160    glUniform1i( _uniform_terrain_uTexGarbage, i );
 161 }
 162 static void shader_terrain_uTexGradients(int i){
 163    glUniform1i( _uniform_terrain_uTexGradients, i );
 164 }
 165 static void shader_terrain_uCamera(v3f v){
 166    glUniform3fv( _uniform_terrain_uCamera, 1, v );
 167 }
 168 static void shader_terrain_g_world_depth(int i){
 169    glUniform1i( _uniform_terrain_g_world_depth, i );
 170 }
 171 static void shader_terrain_register(void){
 172    vg_shader_register( &_shader_terrain );
 173 }
 174 static void shader_terrain_use(void){ glUseProgram(_shader_terrain.id); }
 175 static void shader_terrain_link(void){
 176    _uniform_terrain_uPv = glGetUniformLocation( _shader_terrain.id, "uPv" );
 177    _uniform_terrain_uMdl = glGetUniformLocation( _shader_terrain.id, "uMdl" );
 178    _uniform_terrain_uTexGarbage = glGetUniformLocation( _shader_terrain.id, "uTexGarbage" );
 179    _uniform_terrain_uTexGradients = glGetUniformLocation( _shader_terrain.id, "uTexGradients" );
 180    _uniform_terrain_uCamera = glGetUniformLocation( _shader_terrain.id, "uCamera" );
 181    _uniform_terrain_g_world_depth = glGetUniformLocation( _shader_terrain.id, "g_world_depth" );
 182 }
 183 #endif /* SHADER_terrain_H */